ci(release): verify linux ffmpeg download

chore: bump yt-dlp to 2026.6.9

.github/dependabot.yml

@@ -0,0 +1,16 @@
+version: 2
+updates:
+  - package-ecosystem: pip
+    directory: "/"
+    schedule:
+      interval: daily
+      time: "10:00"
+    groups:
+      python-packages:
+        patterns:
+          - "*"
+        
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/build-release.yml

@@ -0,0 +1,330 @@
+name: Build & Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Tag to create (e.g., v2.0.0)"
+        required: true
+        default: "v2.0.0"
+        type: string
+      force_tag:
+        description: "Recreate tag if it already exists"
+        required: false
+        default: false
+        type: boolean
+      draft:
+        description: "Create release as draft"
+        required: false
+        default: true
+        type: boolean
+
+
+permissions:
+  contents: write
+
+jobs:
+  tag:
+    name: Create tag
+    needs: test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Validate input tag
+        shell: bash
+        run: |
+          set -euo pipefail
+          TAG="${{ inputs.tag }}"
+          if [[ -z "$TAG" ]]; then
+            echo "tag is required" >&2
+            exit 1
+          fi
+          if [[ "$TAG" != v* ]]; then
+            echo "tag must start with 'v' (got: $TAG)" >&2
+            exit 1
+          fi
+
+      - name: Create/push tag
+        shell: bash
+        env:
+          TAG: ${{ inputs.tag }}
+          FORCE: ${{ inputs.force_tag }}
+        run: |
+          set -euo pipefail
+
+          if git rev-parse -q --verify "refs/tags/${TAG}" >/dev/null; then
+            if [[ "${FORCE}" != "true" ]]; then
+              echo "Tag ${TAG} already exists. Re-run with force_tag=true to recreate." >&2
+              exit 1
+            fi
+            git tag -d "${TAG}" || true
+            git push origin ":refs/tags/${TAG}" || true
+          fi
+
+          git tag "${TAG}" "${GITHUB_SHA}"
+          git push origin "${TAG}"
+
+  test:
+    name: Unit tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
+        with:
+          python-version: "3.12"
+          cache: "pip"
+      - name: Install
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e ".[dev]" || pip install -e .
+          pip install pytest
+      - name: Run tests
+        env:
+          PYTHONPATH: ${{ github.workspace }}/src
+        run: pytest
+
+  build:
+    name: Build packages
+    needs: tag
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest, ubuntu-latest]
+        ffmpeg: [bundled, none]
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Derive version
+        id: version
+        shell: bash
+        run: |
+          TAG="${{ inputs.tag }}"
+          echo "tag=${TAG}" >> "$GITHUB_OUTPUT"
+          echo "version=${TAG#v}" >> "$GITHUB_OUTPUT"
+
+      - name: Write bundled version file
+        shell: bash
+        run: |
+          set -euo pipefail
+          printf '%s\n' "${{ steps.version.outputs.version }}" > version.txt
+
+      - uses: actions/setup-python@v6
+        with:
+          python-version: "3.12"
+          cache: "pip" 
+
+      - name: Install build deps
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e . 
+          pip install pyinstaller
+
+      - name: Build binary (Windows)
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          $ErrorActionPreference = "Stop"
+          $ws = "${{ github.workspace }}"
+          pyinstaller --noconfirm --onefile --noconsole --name "ytpl-sync" --icon "$ws/assets/icon.ico" --add-data "$ws/assets/icon.png;assets" --add-data "$ws/version.txt;." --distpath "dist/pyinstaller" --workpath "build/pyinstaller" --specpath "build/pyinstaller" --paths "src" "ytpl-sync-entry.py"
+
+      - name: Build binary (Linux)
+        if: runner.os == 'Linux'
+        shell: bash
+        run: |
+          set -euo pipefail
+          pyinstaller --noconfirm --onefile --noconsole --name "ytpl-sync" --icon "${GITHUB_WORKSPACE}/assets/icon.png" --add-data "${GITHUB_WORKSPACE}/assets/icon.png:assets" --add-data "${GITHUB_WORKSPACE}/version.txt:." --distpath "dist/pyinstaller" --workpath "build/pyinstaller" --specpath "build/pyinstaller" --paths "src" "ytpl-sync-entry.py"
+
+      - name: Stage package
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          OS="${{ runner.os }}"
+          FFMPEG="${{ matrix.ffmpeg }}"
+          VERSION="${{ steps.version.outputs.version }}"
+
+          PKG_ROOT="$GITHUB_WORKSPACE/package"
+          rm -rf "$PKG_ROOT"
+          mkdir -p "$PKG_ROOT/config" "$PKG_ROOT/bin"
+
+          # Binary
+          if [[ "$OS" == "Windows" ]]; then
+            cp "$GITHUB_WORKSPACE/dist/pyinstaller/ytpl-sync.exe" "$PKG_ROOT/ytpl-sync.exe"
+          else
+            cp "$GITHUB_WORKSPACE/dist/pyinstaller/ytpl-sync" "$PKG_ROOT/ytpl-sync.exe"
+            chmod +x "$PKG_ROOT/ytpl-sync.exe"
+          fi
+
+          # Config: ship example as the default config
+          python - <<'PY'
+          import json
+          import os
+          from pathlib import Path
+
+          workspace = Path(os.environ["GITHUB_WORKSPACE"])
+          pkg_root = workspace / "package"
+          src = workspace / "config" / "yt-playlist-config.example.json"
+          dst = pkg_root / "config" / "yt-playlist-config.json"
+          data = json.loads(src.read_text(encoding="utf-8"))
+
+          os_name = os.environ["RUNNER_OS"]
+          ffmpeg_mode = os.environ["FFMPEG_MODE"]
+          if ffmpeg_mode == "bundled":
+            data["ffmpeg_path"] = "./bin/ffmpeg.exe" if os_name == "Windows" else "./bin/ffmpeg"
+          else:
+            data["ffmpeg_path"] = "ffmpeg"
+
+          dst.write_text(json.dumps(data, indent=2) + "\n", encoding="utf-8")
+          PY
+        env:
+          FFMPEG_MODE: ${{ matrix.ffmpeg }}
+
+      - name: Bundle FFmpeg (Windows)
+        if: runner.os == 'Windows' && matrix.ffmpeg == 'bundled'
+        shell: pwsh
+        run: |
+          $ErrorActionPreference = "Stop"
+          New-Item -ItemType Directory -Force -Path "package/bin" | Out-Null
+          Invoke-WebRequest -Uri "https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-essentials.zip" -OutFile "ffmpeg.zip"
+          Expand-Archive "ffmpeg.zip" -DestinationPath "ffmpeg_tmp"
+          $ffmpegExe = Get-ChildItem -Path "ffmpeg_tmp" -Filter "ffmpeg.exe" -Recurse | Select-Object -First 1
+          if (-not $ffmpegExe) { throw "ffmpeg.exe not found in archive" }
+          Copy-Item $ffmpegExe.FullName "package/bin/ffmpeg.exe"
+          Remove-Item -Force "ffmpeg.zip"
+          Remove-Item -Recurse -Force "ffmpeg_tmp"
+
+      - name: Bundle FFmpeg (Linux)
+        if: runner.os == 'Linux' && matrix.ffmpeg == 'bundled'
+        shell: bash
+        run: |
+          set -euo pipefail
+          mkdir -p package/bin ffmpeg_tmp
+
+          primary_url="https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz"
+          curl_common=(
+            --fail
+            --location
+            --retry 5
+            --retry-all-errors
+            --retry-delay 2
+            --user-agent "Mozilla/5.0 (GitHub Actions; ytpl-sync release workflow)"
+          )
+
+          curl "${curl_common[@]}" "$primary_url" -o ffmpeg.tar.xz
+          curl "${curl_common[@]}" "${primary_url}.md5" -o ffmpeg.tar.xz.md5
+
+          expected_md5="$(awk '{print $1}' ffmpeg.tar.xz.md5)"
+          printf '%s *ffmpeg.tar.xz\n' "$expected_md5" | md5sum -c -
+
+          if ! tar -tf ffmpeg.tar.xz >/dev/null 2>&1; then
+            echo "Downloaded FFmpeg payload is not a valid tar archive" >&2
+            ls -l ffmpeg.tar.xz >&2 || true
+            head -c 256 ffmpeg.tar.xz >&2 || true
+            exit 1
+          fi
+
+          tar -xf ffmpeg.tar.xz -C ffmpeg_tmp --strip-components=1
+          mv ffmpeg_tmp/ffmpeg package/bin/ffmpeg
+          chmod +x package/bin/ffmpeg
+
+      - name: Archive (Windows)
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          $ErrorActionPreference = "Stop"
+          $version = "${{ steps.version.outputs.version }}"
+          $variant = "${{ matrix.ffmpeg }}"
+          if ($variant -eq "bundled") {
+            $name = "ytpl-sync-windows-$version-ffmpeg.zip"
+          } else {
+            $name = "ytpl-sync-windows-$version.zip"
+          }
+          Compress-Archive -Path "package/*" -DestinationPath $name
+
+      - name: Archive (Linux)
+        if: runner.os == 'Linux'
+        shell: bash
+        run: |
+          set -euo pipefail
+          version="${{ steps.version.outputs.version }}"
+          variant="${{ matrix.ffmpeg }}"
+          if [[ "$variant" == "bundled" ]]; then
+            name="ytpl-sync-linux-${version}-ffmpeg.tar.gz"
+          else
+            name="ytpl-sync-linux-${version}.tar.gz"
+          fi
+          tar -C package -czf "$name" .
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v7
+        with:
+          name: packages-${{ runner.os }}-${{ matrix.ffmpeg }}
+          path: |
+            ytpl-sync-*.zip
+            ytpl-sync-*.tar.gz
+
+  release:
+    name: Create Release
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Download artifacts
+        uses: actions/download-artifact@v8
+        with:
+          path: artifacts
+
+      - name: Generate release notes
+        shell: bash
+        env:
+          TAG: ${{ inputs.tag }}
+        run: |
+          set -euo pipefail
+          git fetch --tags --force
+
+          VERSION="${TAG#v}"
+          REPO="${GITHUB_REPOSITORY}"
+
+          prev_tag="$(git tag --sort=-creatordate | grep -Fxv "$TAG" | head -n 1 || true)"
+
+          {
+            echo "### Changes"
+            echo
+            if [[ -n "$prev_tag" ]]; then
+              echo "Compared to \`$prev_tag\`:"
+              echo
+              git log "${prev_tag}..${TAG}" --no-merges --pretty=format:'- %s (%h)' || true
+            else
+              echo "First tagged release:"
+              echo
+              git log "${TAG}" --no-merges --pretty=format:'- %s (%h)' || true
+            fi
+
+            echo
+            echo
+            echo "### Reports"
+            echo "![Downloads](https://img.shields.io/github/downloads/${REPO}/${TAG}/total?style=flat-square&logo=github&label=Downloads)"
+            echo "![Linux FFmpeg](https://img.shields.io/github/downloads/${REPO}/${TAG}/ytpl-sync-linux-${VERSION}-ffmpeg.tar.gz?style=flat-square&label=Linux+FFmpeg)"
+            echo "![Linux](https://img.shields.io/github/downloads/${REPO}/${TAG}/ytpl-sync-linux-${VERSION}.tar.gz?style=flat-square&label=Linux)"
+            echo "![Windows FFmpeg](https://img.shields.io/github/downloads/${REPO}/${TAG}/ytpl-sync-windows-${VERSION}-ffmpeg.zip?style=flat-square&label=Windows+FFmpeg)"
+            echo "![Windows](https://img.shields.io/github/downloads/${REPO}/${TAG}/ytpl-sync-windows-${VERSION}.zip?style=flat-square&label=Windows)"
+            echo
+          } > release-notes.md
+
+      - name: Create release
+        uses: softprops/action-gh-release@v3
+        with:
+          tag_name: ${{ inputs.tag }}
+          draft: ${{ inputs.draft }}
+          body_path: release-notes.md
+          files: |
+            artifacts/**/*.zip
+            artifacts/**/*.tar.gz

.github/workflows/integration.yml

@@ -0,0 +1,37 @@
+name: Integration tests (minimal)
+
+on:
+  workflow_dispatch:
+
+
+jobs:
+  integration:
+    name: Run integration tests
+    runs-on: ubuntu-latest
+    env:
+      INTEGRATION_TEST: '1'
+      # Used by the integration tests to locate ffmpeg reliably.
+      FFMPEG_PATH: '/usr/bin/ffmpeg'
+      TEST_PLAYLIST_URL: 'https://www.youtube.com/playlist?list=PLUmRr21IDW9WCW87FnbWAbIwwZHbf-lAz'
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.11'
+          cache: 'pip'
+
+      - name: Install ffmpeg
+        run: |
+          set -euo pipefail
+          sudo apt-get update
+          sudo apt-get install -y ffmpeg
+
+      - name: Run integration tests
+        run: |
+          set -euo pipefail
+          python -m pip install -e ".[test]"
+          pytest -m integration

.github/workflows/lint_ruff.yml

@@ -0,0 +1,28 @@
+name: Lint Python code
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - "assets/**"
+      - "README.md"
+  pull_request:
+    branches:
+      - main
+    paths-ignore:
+      - "assets/**"
+      - "README.md"
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Install Ruff
+        run: pip install ruff
+
+      - name: Run linter
+        run: ruff check .

.github/workflows/release.yml

@@ -1,322 +0,0 @@
-name: Build Release Packages
-
-on:
-  workflow_dispatch:
-    inputs:
-      tag:
-        description: "Release tag (e.g., v0.1.0)"
-        required: true
-        type: string
-
-permissions:
-  contents: write
-  packages: write
-
-jobs:
-  build-windows-package:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v5
-
-      - name: Install dependencies
-        run: sudo apt update && sudo apt install -y unzip zip curl
-
-      - name: Get version from tag
-        id: version
-        shell: bash
-        run: |
-          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
-            VERSION="${{ inputs.tag }}"
-          elif [ "${{ github.event_name }}" = "release" ]; then
-            VERSION="${{ github.event.release.tag_name }}"
-          else
-            VERSION="${{ github.ref_name }}"
-          fi
-          VERSION="${VERSION#v}"
-          echo "version=$VERSION" >> $GITHUB_OUTPUT
-
-      - name: Prepare Windows package
-        run: |
-          set -e
-          VERSION="${{ steps.version.outputs.version }}"
-          mkdir -p "$GITHUB_WORKSPACE/dist/windows/bin"
-          cp "$GITHUB_WORKSPACE/yt-playlist-main.py" "$GITHUB_WORKSPACE/dist/windows/"
-
-          # yt-dlp
-          curl -fL --retry 3 -H "User-Agent: github-actions" \
-            -o "$GITHUB_WORKSPACE/dist/windows/bin/yt-dlp.exe" \
-            https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp.exe
-
-          # FFmpeg Windows static
-          curl -fL --retry 3 -H "User-Agent: github-actions" \
-            -o "$GITHUB_WORKSPACE/dist/windows/ffmpeg.zip" \
-            https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-essentials.zip
-          unzip -q "$GITHUB_WORKSPACE/dist/windows/ffmpeg.zip" -d "$GITHUB_WORKSPACE/dist/windows/ffmpeg_temp"
-          mv $(find "$GITHUB_WORKSPACE/dist/windows/ffmpeg_temp" -name ffmpeg.exe | head -n 1) "$GITHUB_WORKSPACE/dist/windows/bin/ffmpeg.exe"
-
-          # aria2c Windows static
-          curl -fL --retry 3 -H "User-Agent: github-actions" \
-            -o "$GITHUB_WORKSPACE/dist/windows/aria2c.zip" \
-            https://github.com/aria2/aria2/releases/download/release-1.37.0/aria2-1.37.0-win-64bit-build1.zip
-          unzip "$GITHUB_WORKSPACE/dist/windows/aria2c.zip" -d "$GITHUB_WORKSPACE/dist/windows/"
-          mv "$GITHUB_WORKSPACE/dist/windows/aria2-1.37.0-win-64bit-build1/aria2c.exe" "$GITHUB_WORKSPACE/dist/windows/bin/aria2c.exe"
-
-          rm -rf "$GITHUB_WORKSPACE/dist/windows/ffmpeg_temp" "$GITHUB_WORKSPACE/dist/windows/aria2-1.37.0-win-64bit-build1" "$GITHUB_WORKSPACE/dist/windows/ffmpeg.zip" "$GITHUB_WORKSPACE/dist/windows/aria2c.zip"
-
-          # Create windows archive
-          cd "$GITHUB_WORKSPACE/dist/windows"
-          ZIP_NAME="yt-playlist-windows-${VERSION}.zip"
-          zip -r "$GITHUB_WORKSPACE/$ZIP_NAME" *
-          echo "ZIP_PATH=$GITHUB_WORKSPACE/$ZIP_NAME" >> $GITHUB_ENV
-
-      - name: Upload Windows artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: windows-release
-          path: ${{ github.workspace }}/yt-playlist-windows-*.zip
-
-  build-linux-package:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v5
-
-      - name: Get version from tag
-        id: version
-        shell: bash
-        run: |
-          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
-            VERSION="${{ inputs.tag }}"
-          elif [ "${{ github.event_name }}" = "release" ]; then
-            VERSION="${{ github.event.release.tag_name }}"
-          else
-            VERSION="${{ github.ref_name }}"
-          fi
-          VERSION="${VERSION#v}"
-          echo "version=$VERSION" >> $GITHUB_OUTPUT
-
-      - name: Install dependencies
-        run: |
-          sudo apt update
-          sudo apt install -y unzip zip curl wget build-essential pkg-config libssl-dev zlib1g-dev
-
-      - name: Prepare workspace
-        run: |
-          set -e
-          mkdir -p "$GITHUB_WORKSPACE/dist/linux/bin"
-          cp "$GITHUB_WORKSPACE/yt-playlist-main.py" "$GITHUB_WORKSPACE/dist/linux/"
-
-      - name: Download yt-dlp
-        run: |
-          curl -fL --retry 3 -H "User-Agent: github-actions" \
-            -o "$GITHUB_WORKSPACE/dist/linux/bin/yt-dlp" \
-            https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp_linux
-          chmod +x "$GITHUB_WORKSPACE/dist/linux/bin/yt-dlp"
-
-      - name: Download FFmpeg static
-        run: |
-          curl -fL --retry 3 -H "User-Agent: github-actions" \
-            -o "$GITHUB_WORKSPACE/dist/linux/ffmpeg.tar.xz" \
-            https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz
-          mkdir -p "$GITHUB_WORKSPACE/dist/linux/ffmpeg_temp"
-          tar -xf "$GITHUB_WORKSPACE/dist/linux/ffmpeg.tar.xz" -C "$GITHUB_WORKSPACE/dist/linux/ffmpeg_temp" --strip-components=1
-          mv "$GITHUB_WORKSPACE/dist/linux/ffmpeg_temp/ffmpeg" "$GITHUB_WORKSPACE/dist/linux/bin/ffmpeg"
-          chmod +x "$GITHUB_WORKSPACE/dist/linux/bin/ffmpeg"
-      
-      - name: Restore aria2 cache
-        id: aria2-cache
-        uses: actions/cache@v3
-        with:
-          path: dist/linux/bin/aria2c
-          key: aria2c-${{ runner.os }}-1.37.0
-            
-      - name: Build aria2c if not cached
-        if: steps.aria2-cache.outputs.cache-hit != 'true'   
-        run: |
-          set -e
-          mkdir -p "$GITHUB_WORKSPACE/dist/linux/bin"
-
-          mkdir -p "$GITHUB_WORKSPACE/dist/linux/aria2c_build"
-          cd "$GITHUB_WORKSPACE"
-          wget https://github.com/aria2/aria2/releases/download/release-1.37.0/aria2-1.37.0.tar.gz
-          tar -xzf aria2-1.37.0.tar.gz
-          cd aria2-1.37.0
-          CFLAGS="-Os -s" LDFLAGS="-static" ./configure \
-            --enable-static --disable-shared \
-            --disable-libaria2 --without-ca-bundle \
-            --without-libnettle --without-libgcrypt \
-            --without-libssh2 --without-libexpat \
-            --without-libxml2 --without-libsqlite3 \
-            --with-openssl
-          make -j"$(nproc)"
-          strip src/aria2c
-          cp src/aria2c "$GITHUB_WORKSPACE/dist/linux/bin/aria2c"
-          chmod +x "$GITHUB_WORKSPACE/dist/linux/bin/aria2c"
-          rm -rf "$GITHUB_WORKSPACE/dist/linux/aria2c_build" "$GITHUB_WORKSPACE/aria2-1.37.0" "$GITHUB_WORKSPACE/aria2-1.37.0.tar.gz"
-
-
-      - name: Show cache status and bin contents
-        run: |
-          echo "Cache hit: ${{ steps.aria2-cache.outputs.cache-hit }}"
-          echo "Listing dist/linux/bin:" 
-          ls -la dist/linux/bin || true
-
-      - name: Cleanup FFmpeg temp
-        run: rm -rf "$GITHUB_WORKSPACE/dist/linux/ffmpeg_temp" "$GITHUB_WORKSPACE/dist/linux/ffmpeg.tar.xz"
-
-      - name: Archive Linux package
-        run: |
-          set -e
-          VERSION="${{ steps.version.outputs.version }}"
-          cd "$GITHUB_WORKSPACE/dist/linux"
-          TAR_NAME="yt-playlist-linux-${VERSION}.tar.gz"
-          tar -czf "$GITHUB_WORKSPACE/$TAR_NAME" *
-
-      - name: Upload Linux artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: linux-release
-          path: ${{ github.workspace }}/yt-playlist-linux-${{ steps.version.outputs.version }}.tar.gz
-
-  build-docker-image:
-    runs-on: ubuntu-latest
-    needs: [build-linux-package]
-    steps:
-      - uses: actions/checkout@v5
-
-      - name: Get version from tag
-        id: version
-        shell: bash
-        run: |
-          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
-            VERSION="${{ inputs.tag }}"
-          elif [ "${{ github.event_name }}" = "release" ]; then
-            VERSION="${{ github.event.release.tag_name }}"
-          else
-            VERSION="${{ github.ref_name }}"
-          fi
-          VERSION="${VERSION#v}"
-          echo "version=$VERSION" >> $GITHUB_OUTPUT
-
-      - name: Set docker image names
-        run: |
-          echo "RELEASE_IMAGE=ghcr.io/${GITHUB_ACTOR}/ytpld:${{ steps.version.outputs.version }}" >> $GITHUB_ENV
-          echo "LATEST_IMAGE=ghcr.io/${GITHUB_ACTOR}/ytpld:latest" >> $GITHUB_ENV
-
-      - name: Download linux artifact
-        uses: actions/download-artifact@v4
-        with:
-          name: linux-release
-
-      - name: Prepare Docker build context
-        run: |
-          mkdir -p dist/linux-docker
-          cp Dockerfile dist/linux-docker/
-          echo "Copying and extracting Linux artifact..."
-          tar -xzf yt-playlist-linux-${{ steps.version.outputs.version }}.tar.gz -C dist/linux-docker/
-          echo "Build context contents:"
-          ls -R dist/linux-docker
-
-      - name: Build Docker image (release)
-        run: docker build dist/linux-docker -t $RELEASE_IMAGE
-
-      - name: Save Docker image as tar (release)
-        run: docker save -o docker-image.tar $RELEASE_IMAGE
-
-      - name: Upload docker-image artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: docker-image
-          path: docker-image.tar
-
-      - name: Build Docker image (latest)
-        run: docker build dist/linux-docker --label build_as_latest=true -t $LATEST_IMAGE
-
-      - name: Save Docker image as tar (latest)
-        run: docker save -o docker-image-latest.tar $LATEST_IMAGE
-
-      - name: Upload docker-image-latest artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: docker-image-latest
-          path: docker-image-latest.tar
-
-  release:
-    runs-on: ubuntu-latest
-    needs: [build-windows-package, build-linux-package, build-docker-image]
-    steps:
-      - uses: actions/download-artifact@v4
-        with:
-          name: windows-release
-          path: windows-release
-      - uses: actions/download-artifact@v4
-        with:
-          name: linux-release
-          path: linux-release
-      - uses: actions/download-artifact@v4
-        with:
-          name: docker-image
-          path: docker-image
-      - uses: actions/download-artifact@v4
-        with:
-          name: docker-image-latest
-          path: docker-image-latest
-
-      - name: Get version from tag
-        id: version
-        shell: bash
-        run: |
-          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
-            VERSION="${{ inputs.tag }}"
-          elif [ "${{ github.event_name }}" = "release" ]; then
-            VERSION="${{ github.event.release.tag_name }}"
-          else
-            VERSION="${{ github.ref_name }}"
-          fi
-          VERSION="${VERSION#v}"
-          echo "version=$VERSION" >> $GITHUB_OUTPUT
-      - name: Set docker image names
-        run: |
-          echo "RELEASE_IMAGE=ghcr.io/${GITHUB_ACTOR}/ytpld:${{ steps.version.outputs.version }}" >> $GITHUB_ENV
-          echo "LATEST_IMAGE=ghcr.io/${GITHUB_ACTOR}/ytpld:latest" >> $GITHUB_ENV
-      - name: Login to GitHub Container Registry
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Load and push Docker release image
-        run: |
-          docker load -i docker-image/docker-image.tar
-          docker push $RELEASE_IMAGE
-      - name: Load and push Docker latest image
-        run: |
-          docker load -i docker-image-latest/docker-image-latest.tar
-          docker push $LATEST_IMAGE
-
-      - name: Create GitHub Release
-        id: create_release
-        uses: actions/create-release@v1
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          tag_name: ${{ steps.version.outputs.version }}
-          release_name: "Release${{ steps.version.outputs.version }}"
-          draft: true
-      - name: Upload Windows release asset
-        uses: actions/upload-release-asset@v1
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          upload_url: ${{ steps.create_release.outputs.upload_url }}
-          asset_path: windows-release/yt-playlist-windows-${{ steps.version.outputs.version }}.zip
-          asset_name: yt-playlist-windows-${{ steps.version.outputs.version }}.zip
-          asset_content_type: application/zip
-      - name: Upload Linux release asset
-        uses: actions/upload-release-asset@v1
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          upload_url: ${{ steps.create_release.outputs.upload_url }}
-          asset_path: linux-release/yt-playlist-linux-${{ steps.version.outputs.version }}.tar.gz
-          asset_name: yt-playlist-linux-${{ steps.version.outputs.version }}.tar.gz
-          asset_content_type: application/gzip

.github/workflows/unit-tests.yml

@@ -0,0 +1,49 @@
+name: Unit tests
+
+on:
+  workflow_dispatch:
+  push:
+    branches: 
+      - main
+    paths-ignore:
+      - "assets/**"
+      - "README.md"
+  pull_request:
+    branches:
+      - main
+    paths-ignore:
+      - "assets/**"
+      - "README.md"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  tests:
+    name: Run unit tests
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.11'
+          cache: 'pip'
+
+      - name: Install project
+        run: |
+          set -euo pipefail
+          python -m pip install --upgrade pip
+          # Install project (editable) and test deps
+          python -m pip install -e ".[test]"
+
+      - name: Run tests
+        run: |
+          set -euo pipefail
+          pytest -q

.github/workflows/update-yt-dlp.yml

@@ -0,0 +1,95 @@
+name: update yt-dlp
+on:
+  schedule:
+    - cron: "0 10 * * *"
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+concurrency:
+  group: refresh-yt-dlp-pr
+  cancel-in-progress: true
+
+jobs:
+  refresh:
+    name: Update yt-dlp dependency
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.12"
+
+      - name: Check and bump yt-dlp
+        id: detect
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          python - <<'PY' >> "$GITHUB_OUTPUT"
+          from __future__ import annotations
+
+          import json
+          import re
+          from pathlib import Path
+          from urllib.request import urlopen
+
+          def version_tuple(text: str) -> tuple[int, ...]:
+              parts = re.findall(r"\d+", text)
+              return tuple(int(p) for p in parts)
+
+          pyproject = Path("pyproject.toml")
+          text = pyproject.read_text(encoding="utf-8")
+
+          dep_match = re.search(r'^\s*"yt-dlp>=(?P<version>[^"]+)"\s*,?\s*$', text, re.MULTILINE)
+          if not dep_match:
+              raise SystemExit("Could not find yt-dlp dependency in pyproject.toml")
+
+          dep_version = dep_match.group("version")
+
+          latest_payload = urlopen("https://pypi.org/pypi/yt-dlp/json", timeout=30)
+          latest_version = json.load(latest_payload)["info"]["version"]
+
+          needs_update = version_tuple(latest_version) > version_tuple(dep_version)
+
+          print(f"needs_update={'true' if needs_update else 'false'}")
+          print(f"latest_yt_dlp={latest_version}")
+          print(f"current_yt_dlp={dep_version}")
+
+          if needs_update:
+              text = re.sub(
+                  r'(^\s*"yt-dlp>=)[^"]+(")',
+                  rf'\g<1>{latest_version}\2',
+                  text,
+                  flags=re.MULTILINE,
+              )
+              pyproject.write_text(text, encoding="utf-8")
+          PY
+
+      - name: Create or update pull request
+        if: steps.detect.outputs.needs_update == 'true'
+        uses: peter-evans/create-pull-request@v8
+        with:
+          # Use a non-GITHUB_TOKEN credential so the resulting PR triggers CI workflows.
+          # Configure secrets.PR_WORKFLOW_TOKEN with contents:write and pull-requests:write.
+          token: ${{ secrets.PR_WORKFLOW_TOKEN || github.token }}
+          branch: chore/refresh-yt-dlp
+          commit-message: "chore: bump yt-dlp to ${{ steps.detect.outputs.latest_yt_dlp }}"
+          title: "chore: bump yt-dlp to ${{ steps.detect.outputs.latest_yt_dlp }}"
+          body: |
+            Automated yt-dlp dependency refresh.
+
+            - Current version: `${{ steps.detect.outputs.current_yt_dlp }}`
+            - Latest version: `${{ steps.detect.outputs.latest_yt_dlp }}`
+          labels: deps
+          delete-branch: false
+          add-paths: |
+            pyproject.toml

.gitignore

@@ -2,9 +2,14 @@
 
 
 #Custom for this project
-yt-playlist-config.json
-/bin
-/config/
+config/yt-playlist-config.json
+/tmp*
+/*/tmp*
+*.code-workspace
+/bin/*
+/db/*
+plans
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]

.vscode/settings.json

@@ -0,0 +1,9 @@
+{
+    "python.terminal.activateEnvironment": true,
+    "python.testing.pytestArgs": [
+        "tests"
+    ],
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true,
+    "github-actions.workflows.pinned.workflows": []
+}

Dockerfile

@@ -1,10 +0,0 @@
-FROM python:3.12-alpine
-
-WORKDIR /app
-
-COPY yt-playlist-main.py /app/
-COPY ./bin/ffmpeg /app/bin
-COPY ./bin/yt-dlp /app/bin
-COPY ./bin/aria2c /app/bin
-
-CMD ["python", "yt-playlist-main.py"]

LICENSE

@@ -1,232 +0,0 @@
-GNU GENERAL PUBLIC LICENSE
-Version 3, 29 June 2007
-
-Copyright © 2007 Free Software Foundation, Inc. <https://fsf.org/>
-
-Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
-
-Preamble
-
-The GNU General Public License is a free, copyleft license for software and other kinds of works.
-
-The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too.
-
-When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for them if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs, and that you know you can do these things.
-
-To protect your rights, we need to prevent others from denying you these rights or asking you to surrender the rights. Therefore, you have certain responsibilities if you distribute copies of the software, or if you modify it: responsibilities to respect the freedom of others.
-
-For example, if you distribute copies of such a program, whether gratis or for a fee, you must pass on to the recipients the same freedoms that you received. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights.
-
-Developers that use the GNU GPL protect your rights with two steps: (1) assert copyright on the software, and (2) offer you this License giving you legal permission to copy, distribute and/or modify it.
-
-For the developers' and authors' protection, the GPL clearly explains that there is no warranty for this free software. For both users' and authors' sake, the GPL requires that modified versions be marked as changed, so that their problems will not be attributed erroneously to authors of previous versions.
-
-Some devices are designed to deny users access to install or run modified versions of the software inside them, although the manufacturer can do so. This is fundamentally incompatible with the aim of protecting users' freedom to change the software. The systematic pattern of such abuse occurs in the area of products for individuals to use, which is precisely where it is most unacceptable. Therefore, we have designed this version of the GPL to prohibit the practice for those products. If such problems arise substantially in other domains, we stand ready to extend this provision to those domains in future versions of the GPL, as needed to protect the freedom of users.
-
-Finally, every program is threatened constantly by software patents. States should not allow patents to restrict development and use of software on general-purpose computers, but in those that do, we wish to avoid the special danger that patents applied to a free program could make it effectively proprietary. To prevent this, the GPL assures that patents cannot be used to render the program non-free.
-
-The precise terms and conditions for copying, distribution and modification follow.
-
-TERMS AND CONDITIONS
-
-0. Definitions.
-
-“This License” refers to version 3 of the GNU General Public License.
-
-“Copyright” also means copyright-like laws that apply to other kinds of works, such as semiconductor masks.
-
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-
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-
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-
-How to Apply These Terms to Your New Programs
-
-If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms.
-
-To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the “copyright” line and a pointer to where the full notice is found.
-
-     YouTube-Playlist-Downloader
-     Copyright (C) 2025  dark_zoul
-
-     This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
-
-     This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-
-     You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-Also add information on how to contact you by electronic and paper mail.
-
-If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode:
-
-     YouTube-Playlist-Downloader  Copyright (C) 2025  dark_zoul
-     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-     This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an “about box”.
-
-You should also get your employer (if you work as a programmer) or school, if any, to sign a “copyright disclaimer” for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see <https://www.gnu.org/licenses/>.
-
-The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read <https://www.gnu.org/philosophy/why-not-lgpl.html>.

README.md

@@ -1,169 +1,94 @@
-# YouTube Playlist Downloader
+# YouTube Playlist Sync
 
- A cross-platform tool for downloading entire YouTube playlists as MP3 or MP4 files, using [yt-dlp](https://github.com/yt-dlp/yt-dlp), [ffmpeg](https://ffmpeg.org/), and [aria2c](https://github.com/aria2/aria2). Includes a GitHub Actions CI/CD workflow for packaging and releasing Windows and Linux binaries.
+![Release](https://img.shields.io/github/v/release/darkzoul5/YoutubePlaylistSync?style=flat-square&label=Release)
+![Build-Release](https://img.shields.io/github/actions/workflow/status/darkzoul5/YoutubePlaylistSync/build-release.yml?style=flat-square&label=Build-Release)
+![Unit Tests](https://img.shields.io/github/actions/workflow/status/darkzoul5/YoutubePlaylistSync/unit-tests.yml?style=flat-square&label=unit-tests)
+
+A cross-platform tool for downloading and keeping in sync a local copy of entire YouTube playlists as MP3 or MP4 files, using [yt-dlp](https://github.com/yt-dlp/yt-dlp) & [ffmpeg](https://ffmpeg.org/).
 
 Supports audio, video, or both download modes, music and videos are numbered as they are on your youtube playlist, playlist cleanup, and configurable parallel download options.
+Local-first YouTube playlist synchronization client.
 
----
+## What's Included
 
-## Features
-
-- **Download full YouTube playlists** as high-quality MP3 (audio), MP4 (video), or both.
-- **Download mode:** Choose `audio`, `video`, or `both` for each playlist.
-- **Max video quality:** Select from `720p`, `1080p`, `1440p`, `2160p`, or `best`.
-- **Parallel downloads:** Using aria2 for speed.
-- **Automatic renumbering:** Tracks are renumbered to match playlist order after download.
-- **Cleanup of tracks:** Option to remove files not in playlist anymore, with confirmation.
-- **Configurable output paths** and archive tracking.
-- **Cross-platform:** Windows and Linux support.
-- **GitHub Actions CI/CD workflow** for automated packaging and release.
-
----
+- GUI (PySide6 Essentials) playlist manager + sync runner
+- Scanner (yt-dlp extract-only), diff engine, filesystem scan
+- Safe reordering via two-pass rename, recycle deletions
+- Async download queue with simple retry (yt-dlp Python API)
+- SQLite metadata (`last_sync`, download state)
 
 ## Requirements
 
-- Python 3.8+
+- If you download a `-ffmpeg` release: no extra dependencies
+- If you download a non-ffmpeg release: install `ffmpeg` and ensure it's on PATH (needed for `audio` and `both` modes)
 
----
+## Download
 
-## Installation
+Download the latest release from this repo's Releases page and pick one:
 
-### Quick Start
+- `ytpl-sync-windows-{version}-ffmpeg.zip` / `ytpl-sync-linux-{version}-ffmpeg.tar.gz` (ffmpeg bundled)
+- `ytpl-sync-windows-{version}.zip` / `ytpl-sync-linux-{version}.tar.gz` (no ffmpeg bundled)
 
-1. **Download the latest release:**
+## Configure
 
-- Go to the [Releases](https://github.com/darkzoul5/YoutubePlaylistDownloader/releases) page.
-  - Download the appropriate archive for your platform (Windows or Linux).
-
-1. **Unzip the archive:**
-
-- Extract the contents to a folder of your choice.
-
-1. **Edit configuration:**
-
-- Open `yt-playlist-config.json` and adjust paths, playlist URLs, download mode, and quality as needed.
-
-1. **Run the downloader:**
-
-- On Windows:
-
-    ```sh
-    python yt-playlist-main.py
-    ```
-
-- On Linux:
-
-    ```sh
-    python3 yt-playlist-main.py
-    ```
-
----
-
-## Usage
-
-### Configuration
-
-Edit `yt-playlist-config.json` to specify playlists, paths, and options:
+Application uses a json config that canbe edited from UI or manually
 
 ```json
 {
+  "ffmpeg_path": "./bin/ffmpeg.exe",
+  "max_parallel_downloads": 2,
+  "retry_max_retries": 2,
+  "retry_delay_seconds": 1.5,
   "playlists": [
     {
-      "url": "https://www.youtube.com/playlist?list=playlistidhere",
-      "download_mode": "audio",         
-      "max_video_quality": "1080p",
-      "save_path": "./music",
-      "archive": "archive.txt",
+      "url": "https://www.youtube.com/playlist?list=YOUR_PLAYLIST_ID",
+      "download_mode": "video",
+      "max_download_quality": "1080p",
+      "save_path": "./downloads",
+      "name": "my favorite playlist"
     }
-  ],
-  "yt_dlp_path": "./bin/yt-dlp.exe",      // or "yt-dlp" for Linux
-  "ffmpeg_path": "./bin/ffmpeg.exe",      // or "ffmpeg" for Linux
-  "aria2c_path": "./bin/aria2c.exe",      // or "aria2c" for Linux
-  "max_parallel_downloads": 10,
-  "aria2c_connections": 8
+  ]
 }
 ```
 
-- **playlists:** List of playlist objects. Each must have a `url`, `save_path`, and `archive`.
-- **yt_dlp_path, ffmpeg_path, aria2c_path:** Paths to binaries (relative or absolute).
-- **download_mode:** Choose `audio`, `video`, or `both`.
-- **max_video_quality:** Set max video quality for downloads.
-- **max_parallel_downloads:** Number of simultaneous downloads.
-- **aria2c_connections:** Connections per download.
+`max_download_quality`:
 
----
+- Limits yt-dlp download quality (e.g. `"2160p"`, `"1440p"`, `"1080p"`, `"720p"`, `"360p"`). This only affects the downloaded video format selection.
+- Use `"best"` for no height cap (highest available).
+- If the requested max quality isn't available for a video, the best available quality is chosen.
 
-### Running
+`download_mode`:
 
-- Just run the script with Python:
-  - On Windows: `python yt-playlist-main.py`
-  - On Linux: `python3 yt-playlist-main.py`
+- `video`: download playlist videos as `.mp4` (no ffmpeg required)
+- `audio`: download video, extract `.mp3`, delete the video file
+- `both`: download video, extract `.mp3`, keep both files
 
-- The downloader will:
-  - Check for required tools and update yt-dlp automatically
-  - Download new tracks or videos from your playlist(s)
-  - Number and name files to match the playlist order
-  - Skip deleted or private videos
-  - Avoid re-downloading files you've already downloaded
-  - Offer to clean up files that are no longer in the playlist
+Queue / retry:
 
----
+- `max_parallel_downloads`: number of concurrent download workers.
+- `retry_max_retries`: how many times a failed download job is retried.
+- `retry_delay_seconds`: base delay before retry; increases with backoff.
 
-## Docker Usage
+## Run
 
-You can run YouTube Playlist Downloader using the official Docker image.
+- Run `ytpl-sync.exe` (GUI).
 
-### Run the container
+## Tray
 
-```pwsh
-docker run -v /path/to/downloads:/app/downloads -v /path/to/config:/app/config ghcr.io/dark_zoul/ytpld:latest
-```
+- The app supports minimizing to tray on close if the OS provides a system tray; use the tray icon menu to quit.
+- Tray behavior settings (Settings page):
+  - `close_to_tray`: close hides to tray (keeps running).
+  - `minimize_to_tray`: minimize hides to tray.
+  - `start_minimized_to_tray`: start hidden in tray.
 
-Replace `/path/to/downloads` and `/path/to/config` with your local directories.
+## Data & Layout
 
-**Required volumes:**
+- Database: `db/app.db`
+- Outputs: `<save_path>/audio` and/or `<save_path>/video`
+- Recycle bin: `<save_path>/.recycle/{audio,video}`
 
-- `/app/downloads`: Directory for downloaded audio/videos
-- `/app/config`: Directory for the configuration file
+## Roadmap (short)
 
-### Docker Compose example
-
-Create a `docker-compose.yml` with the following content (replace the host paths as needed):
-
-```yaml
-services:
-  yt-downloader:
-    image: ghcr.io/dark_zoul/ytpld:latest
-    container_name: yt-downloader
-    restart: no
-    volumes:
-      - /path/to/downloads:/app/downloads
-      - /path/to/config:/app/config
-```
-
-Run it with:
-
-```pwsh
-docker compose up -d
-```
-
-## Troubleshooting
-
-- **No binaries found:** Ensure paths in `yt-playlist-config.json` are correct and binaries are present.
-- **No tracks downloaded:** Check playlist URL and archive file.
-- **Download mode or quality issues:** Make sure `download_mode` and `max_video_quality` are set to valid values.
-- **Network overload warning:** If you set very high parallel/connections, the script will warn you.
-
----
-
-## License
-
-See [LICENSE](LICENSE).
-
----
-
-## Credits
-
-- [yt-dlp](https://github.com/yt-dlp/yt-dlp)
-- [ffmpeg](https://ffmpeg.org/)
-- [aria2c](https://github.com/aria2/aria2)
+- Scheduler (periodic sync), richer retries/logging
+- Enhanced config validation
+- UX polish (settings, progress, error messages)

config/yt-playlist-config.example.json

@@ -0,0 +1,22 @@
+{
+  "ffmpeg_path": "./bin/ffmpeg.exe",
+  "max_parallel_downloads": 2,
+  "retry_max_retries": 2,
+  "retry_delay_seconds": 1.5,
+  "ui": {
+    "tray": {
+      "close_to_tray": false,
+      "minimize_to_tray": false,
+      "start_minimized_to_tray": false
+    }
+  },
+  "playlists": [
+    {
+      "url": "https://www.youtube.com/playlist?list=YOUR_PLAYLIST_ID_HERE",
+      "download_mode": "video",
+      "max_download_quality": "1080p",
+      "save_path": "./downloads",
+      "name": "my favorite playlist"
+    }
+  ]
+}

plans/GUI plan.md

@@ -0,0 +1,24 @@
+# GUI Plan
+
+## Python-first Desktop Architecture
+
+- **Primary GUI framework**: `PySide6` (Qt for Python).
+
+## Core Features to Implement
+
+1. **Dashboard Overview**: List all tracked playlists, their status (Last Sync), and total size.
+2. **Interactive Configuration**: Wizard-style setup for new playlists (URL detection, folder picker).
+3. **Queue Manager**: Visual progress bars for active downloads, showing speed, ETA, and current video title.
+4. **Log Viewer**: Real-time streaming of yt-dlp logs for troubleshooting.
+5. **Settings Panel**: Global settings for binary paths (ffmpeg), max parallel jobs, and Docker detection toggle.
+
+## Phase 1 Roadmap: "The Bridge"
+
+- [ ] **PySide6 Skeleton**: Basic window with `QWebEngine` (if hybrid) or native `QWidget` dashboard.
+- [ ] **Packaging**: `pyinstaller` configuration to bundle both backend and frontend into a single `.exe`.
+
+## Packaging & Distribution (brief)
+
+- Bundle the backend and GUI into one distributable.
+- Windows: use `pyinstaller` or `briefcase` to create an executable/installer. Consider creating an MSI or Inno Setup installer for a polished UX.
+- Linux: provide AppImage, Snap, or distribution-specific packages (deb/rpm) — AppImage is a good starting point for single-file distribution.

plans/mp3 metadata plan.md

@@ -0,0 +1,161 @@
+# MP3 Metadata Plan
+
+## Subject Area
+
+- Add MP3 tag writing for downloaded YouTube playlist items.
+- Scope is limited to `.mp3` outputs produced by `audio` mode and the MP3 side of `both` mode.
+- Metadata is sourced from YouTube/yt-dlp and embedded after audio extraction.
+
+## Goal
+
+- Write useful MP3 metadata for downloaded playlist items without affecting video-only downloads.
+- Keep the implementation reliable when optional fields are missing.
+- Preserve successful downloads even when metadata embedding partially fails.
+- Provide a per-playlist setting to enable or disable MP3 metadata embedding.
+
+## Required Metadata
+
+- `title` ← video title
+- `artist` ← uploader, fallback to channel
+- `album` ← album name if present
+- `tracknumber` ← playlist index
+- `date` / `year` ← upload date
+- `comment` ← source URL
+- `genre` ← if available
+- `album_art` ← thumbnail
+
+## Configuration Requirement
+
+- Add a per-playlist setting to turn MP3 metadata embedding on or off.
+- Default should be explicitly defined during implementation; recommended default is `enabled` for new configs.
+- The setting should only affect `.mp3` metadata writing and should not change download selection, extraction, or `.mp4` handling.
+
+## Current Constraints
+
+- The current playlist scan keeps only a minimal item shape: title, video id, and playlist index.
+- The scanner uses flat extraction, which is sufficient for diffing but not for full tag data.
+- MP3 extraction currently transcodes audio but does not write ID3 metadata.
+
+## Implementation Strategy
+
+- Keep playlist diffing fast by retaining the current flat scan for remote playlist structure.
+- Fetch full metadata only for items that are actually going to be downloaded or repaired.
+- Write metadata only after MP3 extraction completes successfully.
+- Treat metadata embedding as a post-processing step that can fail softly without discarding the MP3.
+
+## Work Breakdown
+
+### 1. Extend the metadata model
+
+- Add optional fields to `PlaylistItem` for:
+  - uploader
+  - channel
+  - album
+  - upload_date
+  - genre
+  - thumbnail_url
+  - webpage_url
+- Keep `artist` as a derived value instead of storing a separate field.
+
+### 2. Fetch full per-video metadata
+
+- Introduce a metadata fetch step for each item selected for download.
+- Use yt-dlp per-video extraction to retrieve richer fields than the flat playlist entry provides.
+- Prefer canonical values from the video page payload for upload date, uploader/channel, album, genre, thumbnail, and source URL.
+
+### 3. Carry metadata through the download pipeline
+
+- Ensure the enriched `PlaylistItem` reaches the download job and post-processing stage.
+- Keep this propagation in-memory unless restart-safe metadata persistence becomes necessary later.
+- Avoid changing unrelated sync behavior for video-only items.
+- Carry the per-playlist MP3 metadata enabled/disabled setting into the post-processing step.
+
+### 4. Add an MP3 tag writer
+
+- Add `mutagen` as the ID3 writing dependency.
+- Implement a focused tagging component that maps `PlaylistItem` metadata into ID3 frames.
+- Omit fields when the source value is missing instead of writing placeholders.
+
+### 5. Map fields into ID3 tags
+
+- `title` → video title
+- `artist` → uploader, fallback to channel
+- `album` → album if present
+- `tracknumber` → playlist index
+- `date/year` → parsed upload date
+- `comment` → canonical source URL
+- `genre` → genre if present
+
+### 6. Embed album art
+
+- Download the selected thumbnail for the video after the media download succeeds.
+- Attach thumbnail data as embedded cover art when the image type is supported.
+- Fail soft if thumbnail retrieval or embedding fails, and keep the MP3 intact.
+
+### 7. Integrate into modes
+
+- `audio` mode:
+  - download source media
+  - extract MP3
+  - write MP3 tags only when the setting is enabled
+  - delete temporary/source MP4 if configured
+- `both` mode:
+  - download source media
+  - extract MP3
+  - write MP3 tags only when the setting is enabled
+  - keep MP4 unchanged
+- `video` mode:
+  - no MP3 tagging path
+
+### 8. Add configuration surface
+
+- Add the new per-playlist setting to the playlist config model and default config output.
+- Expose the setting in the playlist configuration UI, not as a global app setting.
+- Keep the naming explicit, for example `write_mp3_metadata` or `embed_mp3_metadata`.
+
+## Error Handling Rules
+
+- If download fails, no tagging runs.
+- If extraction fails, no tagging runs.
+- If metadata embedding is disabled, skip the tagging step entirely.
+- If tagging fails, mark the tag step as failed in logs/events but keep the MP3 file.
+- If thumbnail embedding fails, continue with text metadata only.
+- Missing `album` or `genre` is normal and should not be treated as an error.
+
+## Testing Plan
+
+- Unit test metadata mapping from yt-dlp info to the internal metadata model.
+- Unit test ID3 writing against a temporary MP3 fixture.
+- Unit test fallback behavior:
+  - uploader missing, channel present
+  - album missing
+  - genre missing
+  - thumbnail missing
+- Integration test the audio post-processing path with tagging mocked.
+- Integration test the both-mode MP3 path with tagging mocked.
+
+## Documentation Updates
+
+- Document that MP3 tags are written only for `.mp3` outputs.
+- Document the new per-playlist setting that enables or disables MP3 metadata embedding.
+- Document the field fallback rules, especially artist and album behavior.
+- Document that album art comes from the video thumbnail, not playlist artwork.
+- Document that some YouTube items will not expose album or genre information.
+
+## Dependency Decision
+
+- Recommended library: `mutagen`
+- Reason:
+  - direct ID3 support
+  - reliable field-level control
+  - suitable for embedding cover art
+  - avoids depending on ffmpeg metadata flags for all tag logic
+
+## Delivery Order
+
+- First: add config setting and defaults
+- Second: extend metadata model and add full metadata fetch
+- Third: add MP3 tag writer and field mapping
+- Fourth: add thumbnail embedding
+- Fifth: wire tagging into `audio` and `both`
+- Sixth: add tests and docs

plans/project plan.md

@@ -0,0 +1,47 @@
+# Project Plan
+
+## Subject Area
+
+- Tool for downloading and synchronizing local YouTube playlists.
+- Focuses on batch downloading, format selection (audio and/or video), configurable quality and keeping local copies synced with playlist changes.
+- Targets power users and archivists who need large-scale, repeatable playlist archiving and ongoing synchronization, with GUI interface.
+
+## Problem
+
+- Users and power-users who manage large or frequently changing YouTube playlists lack a dependable, configurable tool that:
+  - correctly detects and downloads new videos while avoiding duplicates,
+  - and can be configured easily via file or GUI for repeatable workflows.
+
+## Users Definition
+
+Individuals who need to have a local youtube playlist synced with a large number of videos or audio files
+
+## Functionality Definition
+
+- Multi-format Download:
+  - Video only (mp4)
+  - Audio only (mp3)
+  - Both video and audio (mp3 & mp4)
+- Smart Synchronization:
+  - Archive tracking (prevents re-downloading existing media)
+  - Playlist Pruning (automatically deletes local files no longer in the YouTube playlist)
+  - Sequential Renumbering (keeps local files sorted by playlist position)
+- Advanced Configuration:
+  - Per-playlist settings (Quality, paths, archive file)
+  - Global performance options (Parallel downloads, aria2c threading)
+  - Path management for yt-dlp, ffmpeg, and aria2c (Docker-aware)
+- GUI Integration:
+  - Real-time status updates via backend API
+  - Visual configuration editor
+  - Modern, responsive Qt-based interface
+
+## Platforms
+
+- Desktop: Windows (Primary), Linux
+
+## Architecture & Languages
+
+- Core Engine: Python (yt-dlp)
+- Desktop Frontend: PySide6 (Qt for Python)
+- Distribution: PyInstaller / Briefcase (Windows .exe, Linux AppImage)
+  

plans/project schedule.md

@@ -0,0 +1,26 @@
+# Project Schedule
+
+| No. | Task description | Estimated time |
+| --- | --- | --- |
+| 1 | Define the project requirements, target users, and core features for playlist downloading and synchronization. | 3 hours |
+| 2 | Design the overall architecture for the Python package, CLI entry point, and configuration structure. | 4 hours |
+| 3 | Implement configuration loading and validation for paths, download modes, quality settings, and external tools. | 5 hours |
+| 4 | Build the playlist fetching logic to read playlist entries and detect new, deleted, or private videos. | 5 hours |
+| 5 | Implement the downloader core for audio, video, and combined download modes using yt-dlp, ffmpeg, and aria2c. | 8 hours |
+| 6 | Add filename sanitization, track renumbering, and output path management to keep downloaded files organized. | 5 hours |
+| 7 | Implement playlist update and cleanup logic so the local library stays synchronized with the online playlist. | 5 hours |
+| 8 | Create CLI flags for debug mode, pruning, auto-confirmation, and custom config file selection. | 4 hours |
+| 9 | Add logging, warnings, and error handling for missing binaries, network issues, and invalid settings. | 4 hours |
+| 10 | Prepare Docker support and environment-variable based configuration for containerized usage. | 4 hours |
+| 11 | Review the implementation, fix bugs, and refine behavior based on test results and runtime issues. | 6 hours |
+| 12 | Choose the GUI framework and define the desktop architecture, create a local backend API. | 4 hours |
+| 13 | Build the initial desktop GUI prototype with controls & basic actions. | 6 hours |
+| 14 | Connect the GUI to backend functionality for adding playlists, starting downloads, and showing progress updates. | 6 hours |
+| 15 | Add GUI settings for download mode, quality, save paths, and external tool configuration. | 5 hours |
+| 16 | Prepare GUI packaging and distribution for Windows and Linux. | 5 hours |
+| 17 | Write automated tests for config loading, downloader behavior, playlist updates, and cleanup edge cases. | 7 hours |
+| 18 | Write user documentation, usage examples, and release instructions for Windows and Linux. | 3 hours |
+
+## Total Time
+
+89 hours

plans/python_youtube_playlist_sync_conversion_plan.md

@@ -0,0 +1,778 @@
+# YouTube Playlist Sync — Project Conversion Plan
+
+
+---
+
+# Project Direction
+
+Convert the project from:
+
+```text
+Single-purpose YouTube playlist downloader
+```
+
+into:
+
+```text
+Persistent YouTube playlist synchronization client
+```
+
+The application becomes state-driven.
+
+---
+
+# Core Product Goals
+
+## Main Features
+
+- Sync playlists locally
+- Download missing items
+- Remove deleted playlist items
+- Keep exact playlist ordering
+- Support audio/video modes
+- Multiple playlists
+- Background auto-sync
+- GUI configuration
+- Queue management
+- Logs/history
+
+---
+
+# Explicit Non-Goals (Current Scope)
+
+Not planned right now:
+
+- Built-in media playback
+- Advanced naming templates
+- Drag-and-drop manual ordering
+- Private playlist sync
+- Channel subscriptions
+- Metadata editing
+
+Design the architecture so these can be added later.
+
+---
+
+# Recommended Stack
+
+## Core Language
+
+- Python 3.12+
+
+Reason:
+
+- Native yt-dlp ecosystem
+- Easier async/background work
+- Better packaging than many expect
+- Simpler iteration speed
+
+---
+
+# GUI
+
+## Recommended
+
+- PySide6
+
+Why:
+
+- Modern Qt ecosystem
+- Better long-term support
+- Cleaner than Tkinter
+- Easier dynamic playlist UI
+- Good threading support
+- Better styling
+
+Avoid:
+
+- Tkinter for this scale
+- Electron/Tauri unless you want a web stack
+
+---
+
+# Downloader Backend
+
+## Recommended
+
+- yt-dlp Python API
+
+Install:
+
+```bash
+pip install yt-dlp
+```
+
+Do NOT:
+
+- scrape YouTube manually
+- parse HTML yourself
+- depend on external unofficial APIs
+
+Use yt-dlp for:
+
+- metadata extraction
+- playlist scanning
+- downloading
+- postprocessing
+
+Use your own app for:
+
+- sync logic
+- ordering
+- deletion
+- scheduling
+- state tracking
+
+---
+
+# Media Processing
+
+## Recommended
+
+- ffmpeg
+
+Needed for:
+
+- audio extraction
+- remuxing
+- conversions
+- thumbnail embedding later
+
+Recommended approach:
+
+- auto-detect ffmpeg
+- optionally bundle with packaged app
+
+---
+
+# Database
+
+## Recommended
+
+- SQLite
+
+Reason:
+
+- Zero setup
+- Local-first architecture
+- Perfect for sync metadata
+- Easy migrations
+- Reliable
+
+SQLite is extremely important for this project.
+
+Do NOT rely only on:
+
+- filenames
+- folders
+- JSON
+
+---
+
+# Background Scheduling
+
+## Recommended
+
+- APScheduler
+
+Use for:
+
+- interval syncs
+- delayed jobs
+- retry jobs
+- startup sync
+
+---
+
+# Async/Concurrency
+
+## Recommended
+
+- asyncio
+
+Use for:
+
+- concurrent playlist syncs
+- GUI-safe task execution
+- download queue
+- cancellation
+- progress updates
+
+---
+
+# Logging
+
+## Recommended
+
+- loguru
+
+or:
+
+- standard logging module
+
+Need:
+
+- rotating logs
+- GUI log panel
+- error history
+- debug support
+
+---
+
+# Packaging
+
+## Recommended
+
+### During development
+
+```text
+venv + pip
+```
+
+### Release builds
+
+Choose one:
+
+| Tool        | Notes                           |
+| ----------- | ------------------------------- |
+| Nuitka      | Best performance and protection |
+| PyInstaller | Easier and common               |
+
+Nuitka is probably best long-term.
+
+---
+
+# Major Architectural Changes
+
+---
+
+# 1. Move to State-Based Sync Architecture
+
+Current downloader logic is likely:
+
+```text
+Playlist URL
+↓
+Download everything
+```
+
+Replace with:
+
+```text
+Remote Playlist State
+↓
+Stored Local State
+↓
+Filesystem State
+↓
+Diff Engine
+↓
+Sync Actions
+```
+
+This is the single most important change.
+
+---
+
+# 2. Introduce Playlist Metadata Database
+
+Create persistent tracking.
+
+Suggested tables:
+
+## playlists
+
+```sql
+CREATE TABLE playlists (
+    id TEXT PRIMARY KEY,
+    name TEXT,
+    url TEXT,
+    path TEXT,
+    mode TEXT,
+    auto_sync INTEGER,
+    sync_interval_minutes INTEGER,
+    last_sync TEXT
+);
+```
+
+## playlist\_items
+
+```sql
+CREATE TABLE playlist_items (
+    playlist_id TEXT,
+    video_id TEXT,
+    title TEXT,
+    playlist_index INTEGER,
+    local_filename TEXT,
+    downloaded INTEGER,
+    last_seen TEXT,
+    PRIMARY KEY (playlist_id, video_id)
+);
+```
+
+---
+
+# 3. Implement Playlist Scanner Layer
+
+Create dedicated metadata extraction.
+
+Suggested structure:
+
+```text
+core/
+ ├── scanner/
+ │    └── playlist_scanner.py
+```
+
+Responsibilities:
+
+- fetch playlist entries
+- extract video IDs
+- detect unavailable videos
+- return normalized playlist state
+
+Use:
+
+```python
+extract_info(download=False)
+```
+
+This allows playlist scanning without downloading.
+
+---
+
+# 4. Create Diff Engine
+
+The app should compare:
+
+```text
+Remote playlist
+vs
+Database state
+vs
+Filesystem state
+```
+
+Output actions:
+
+```text
+DOWNLOAD
+DELETE
+RENAME
+REORDER
+SKIP
+REPAIR
+```
+
+Suggested file:
+
+```text
+core/sync/diff_engine.py
+```
+
+This becomes the heart of the application.
+
+---
+
+# 5. Add Download Queue System
+
+Multi-playlist sync requires a queue.
+
+Suggested states:
+
+```text
+Queued
+Downloading
+Converting
+Completed
+Failed
+Skipped
+Cancelled
+```
+
+Suggested structure:
+
+```text
+core/download/
+ ├── queue_manager.py
+ ├── downloader.py
+ └── workers.py
+```
+
+---
+
+# 6. Implement Stable File Naming
+
+Recommended naming:
+
+```text
+0001 - Title.ext
+```
+
+Benefits:
+
+- native filesystem sorting
+- easy reorder support
+- easy repairs
+- user friendly
+
+Use:
+
+```python
+%(playlist_index)04d - %(title)s.%(ext)s
+```
+
+through yt-dlp.
+
+---
+
+# 7. Implement Safe Reordering
+
+Playlist ordering changes frequently.
+
+Never rename directly.
+
+Use:
+
+```text
+Temporary rename pass
+↓
+Final rename pass
+```
+
+Example:
+
+```text
+0001.mp3 → temp_a
+0002.mp3 → temp_b
+↓
+temp_a → 0002.mp3
+```
+
+Avoid collisions.
+
+---
+
+# 8. Implement Deletion Strategy
+
+Recommended:
+
+Instead of immediate delete:
+
+```text
+playlist/.recycle/
+```
+
+Move removed files there.
+
+Benefits:
+
+- safer
+- recoverable
+- easier debugging
+
+Optional:
+
+- auto-clean after X days
+
+---
+
+# 9. Redesign GUI Around Playlists
+
+Current downloader GUIs are usually task-oriented.
+
+You should move to:
+
+```text
+Playlist-oriented UI
+```
+
+Recommended sections:
+
+```text
+Sidebar
+ ├── Playlists
+ ├── Queue
+ ├── History
+ ├── Logs
+ └── Settings
+```
+
+---
+
+# 10. Support Infinite Playlist Entries
+
+Use dynamic UI generation.
+
+Example:
+
+```python
+class PlaylistConfig:
+    url: str
+    path: str
+    mode: str
+    auto_sync: bool
+```
+
+GUI should render from:
+
+```python
+list[PlaylistConfig]
+```
+
+Do NOT hardcode playlist pages.
+
+---
+
+# 11. Add Background Sync
+
+Start simple.
+
+## Phase 1
+
+- Timer-based sync
+- Tray icon
+- Run minimized
+
+## Phase 2
+
+- Background daemon/service
+- Headless mode
+- Autostart support
+
+---
+
+# 12. Add Progress/Event System
+
+Needed for GUI responsiveness.
+
+Recommended:
+
+```text
+event_bus.py
+```
+
+Events:
+
+```text
+DownloadStarted
+DownloadProgress
+SyncStarted
+SyncFinished
+FileDeleted
+PlaylistUpdated
+```
+
+This decouples GUI from backend.
+
+---
+
+# 13. Introduce Config Management
+
+Recommended:
+
+```text
+config.json
+```
+
+Only for:
+
+- app settings
+- UI preferences
+- non-relational settings
+
+Do NOT store sync state in JSON.
+
+---
+
+# Suggested Folder Structure
+
+```text
+app/
+ ├── core/
+ │    ├── scanner/
+ │    ├── sync/
+ │    ├── download/
+ │    ├── database/
+ │    ├── scheduler/
+ │    └── events/
+ │
+ ├── gui/
+ │    ├── pages/
+ │    ├── widgets/
+ │    ├── dialogs/
+ │    └── models/
+ │
+ ├── config/
+ ├── logs/
+ ├── data/
+ └── main.py
+```
+
+---
+
+# Suggested Sync Flow
+
+```text
+Load playlists
+↓
+Scheduler triggers sync
+↓
+Scanner fetches remote playlist
+↓
+Database state loaded
+↓
+Filesystem scanned
+↓
+Diff engine computes actions
+↓
+Queue downloads
+↓
+Reorder files
+↓
+Move removed files
+↓
+Update database
+↓
+Emit GUI events
+```
+
+---
+
+# Recommended MVP Conversion Order
+
+## Phase 1 — Backend Foundation
+
+Implement:
+
+- SQLite
+- playlist scanner
+- diff engine
+- download wrapper
+- basic sync logic
+
+No GUI redesign yet.
+
+---
+
+# Phase 2 — Stable Syncing
+
+Implement:
+
+- deletion handling
+- reorder handling
+- queue system
+- retry system
+- logs
+
+---
+
+# Phase 3 — GUI Rewrite
+
+Implement:
+
+- playlist manager UI
+- queue page
+- logs page
+- settings page
+- dynamic playlists
+
+---
+
+# Phase 4 — Automation
+
+Implement:
+
+- background sync
+- tray mode
+- startup sync
+- periodic sync
+
+---
+
+# Important Recommendations
+
+## Recommendation 1
+
+Treat:
+
+```text
+video_id
+```
+
+as the canonical identity.
+
+Never titles.
+
+---
+
+# Recommendation 2
+
+Do NOT rely on yt-dlp archive files alone.
+
+Your own DB should be the source of truth.
+
+---
+
+# Recommendation 3
+
+Keep download logic isolated.
+
+yt-dlp should be replaceable internally.
+
+---
+
+# Recommendation 4
+
+Do not overcomplicate the GUI early.
+
+Focus on sync correctness first.
+
+Sync reliability matters more than appearance.
+
+---
+
+# Recommendation 5
+
+Design everything around interruption recovery.
+
+The app should survive:
+
+- crashes
+- partial downloads
+- force closes
+- network failures
+- playlist changes mid-sync
+
+---
+
+# Recommendation 6
+
+Keep the application local-first.
+
+No account system. No cloud backend. No telemetry.
+
+That becomes a strong project identity.
+
+---
+
+# Final Recommended Identity
+
+Instead of:
+
+```text
+YouTube Downloader GUI
+```
+
+Position the project as:
+
+```text
+Local-first YouTube playlist synchronization client.
+```
+
+That identity is:
+
+- clearer
+- more unique
+- technically stronger
+- easier to expand later

plans/sync refactor maybe.md

@@ -0,0 +1,121 @@
+You need to separate playlist sync state from download attempts.
+
+The goal should not be “all 400 downloaded in one run”. It should be:
+
+All downloadable items eventually reach a final state. Temporary failures are retried later. Permanent failures are recorded clearly.
+
+Use statuses like:
+
+queued
+downloading
+completed
+
+temporary_failed
+rate_limited
+verification_required
+
+unavailable
+private
+geo_blocked
+copyright_blocked
+age_restricted
+unsupported
+failed_permanent
+
+skipped_by_user
+removed_from_playlist
+
+Main logic:
+
+1. Fetch playlist metadata
+2. Create/update queue items for all playlist videos
+3. Download available queued items
+4. On normal temporary errors: retry later
+5. On YouTube rate-limit / bot check: pause the whole sync
+6. On unavailable/private/deleted videos: mark as permanent failure
+7. On next sync: retry only retryable items
+
+Important: do not delete queue records just because download failed. Keep them as sync records.
+
+For each video, store:
+
+video_id
+playlist_id
+playlist_position
+wanted_format: audio | video
+status
+failure_type
+failure_message
+attempt_count
+last_attempt_at
+next_retry_at
+is_retryable
+local_file_path
+
+Retry behavior:
+
+temporary_failed -> retry with backoff
+rate_limited -> pause playlist/app queue, retry much later
+verification_required -> pause until user action
+unavailable/private/deleted -> do not retry often
+geo/age restricted -> do not retry unless settings/auth changed
+
+Example backoff:
+
+attempt 1: retry after 10 minutes
+attempt 2: retry after 1 hour
+attempt 3: retry after 6 hours
+attempt 4: retry after 24 hours
+attempt 5+: retry manually or during next scheduled sync
+
+For the user, show a sync summary:
+
+Playlist sync partially completed
+
+Downloaded: 200
+Queued: 0
+Retry later: 80
+Needs attention: 1
+Unavailable: 119
+
+The playlist is still tracked. Retryable items will be attempted again in the next sync.
+
+Best behavior for the 400-item example:
+
+200 downloaded
+50 unavailable/private/deleted -> mark permanent
+149 temporary/rate-limited -> retry later
+1 bot/verification error -> pause sync and ask user
+
+Do not cancel the whole sync as “failed”. Mark it as:
+
+completed_with_issues
+paused_needs_attention
+partially_synced
+
+In UI terms, the playlist should have a health/status:
+
+Synced
+Syncing
+Partially synced
+Paused - needs attention
+Error
+
+The most important rule:
+
+Never lose the reason why an item did not download.
+
+That lets your app eventually download everything possible without repeatedly hammering YouTube or confusing the user.
+
+
+## What to change to match the plan
+
+Fix the destructive UPSERT behavior in src/app/core/database/db.py / SyncService.sync_from_config() so scans update metadata (title/index/last_seen) but do not overwrite existing downloaded/local_filename (and later: status/failure fields).
+
+Introduce a persistent table (or extend playlist_items) with:
+status, failure_type, failure_message, attempt_count, last_attempt_at, next_retry_at, is_retryable, wanted_format, local_file_path.
+
+Update ActionExecutor / worker layer to write transitions into DB (queued → downloading → completed / temporary_failed / rate_limited / verification_required / failed_permanent).
+
+Change “next sync” selection to only pick queued or retryable && next_retry_at <= now, not everything each time.
+Add summary/health states (partially_synced, paused_needs_attention, etc.) based on counts.

pyproject.toml

@@ -0,0 +1,36 @@
+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "ytpl-sync"
+version = "2.1.1"
+description = "YouTube playlist Sync"
+readme = "README.md"
+authors = [ { name = "Dark_Zoul" } ]
+license = { file = "LICENSE" }
+keywords = ["youtube", "yt-dlp", "playlist", "sync"]
+requires-python = ">=3.10"
+dependencies = [
+	"yt-dlp>=2026.6.9",
+    "PySide6_Essentials>=6.11.1",
+]
+[project.optional-dependencies]
+test = [
+    "pytest",
+    "ruff",
+    "black"
+]
+
+[project.urls]
+Home = "https://github.com/darkzoul5/YoutubePlaylistSync"
+
+[project.scripts]
+ytpl-sync = "app.cli:main"
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+
+[tool.setuptools.packages.find]
+where = ["src"]
+include = ["app*"]

pytest.ini

@@ -0,0 +1,7 @@
+[pytest]
+testpaths = tests
+# Collect all standardized tests using the conventional pattern
+python_files = test_*.py
+addopts = -q
+markers =
+    integration: real network/file download tests (opt-in)

src/app/__init__.py

@@ -0,0 +1,10 @@
+"""
+App package: backend foundation for playlist sync (no GUI).
+
+This package is the new, state-driven backend. It is intentionally
+minimal at this stage and will be filled out iteratively.
+"""
+
+__all__ = [
+    "core",
+]

src/app/cli.py

@@ -0,0 +1,112 @@
+from __future__ import annotations
+
+import argparse
+import asyncio
+import logging
+from pathlib import Path
+
+from .config.settings import Settings
+from .core.database.db import Database
+from .core.sync.service import SyncService
+from .core.sync.executor import ActionExecutor
+from .core.events.event_bus import EventBus
+import re
+from .core.utils.yt import extract_playlist_id
+from .core.utils.deps import DependencyError
+from .core.utils.logging_setup import configure_logging
+
+
+def main(argv: list[str] | None = None) -> int:
+    parser = argparse.ArgumentParser(description="YouTube Playlist Sync — compute/apply actions")
+    parser.add_argument("--apply", action="store_true", help="Apply actions (otherwise compute-only)")
+    parser.add_argument("--db", type=Path, default=Path("db/app.db"), help="Path to SQLite database")
+    parser.add_argument("--playlist", type=int, default=None, help="Only run for a specific playlist index (0-based)")
+    parser.add_argument("--verbose", action="store_true", help="Print detailed events (rename/recycle/start)")
+    parser.add_argument("--debug", action="store_true", help="Enable debug logging to console + app/data/app.log")
+    args = parser.parse_args(argv)
+
+    configure_logging(verbose=bool(args.debug), log_file=Path("app/data/app.log"))
+    log = logging.getLogger(__name__)
+
+    settings = Settings()
+    db = Database(args.db.resolve())
+    service = SyncService(db)
+    bus = EventBus()
+    executor = ActionExecutor(db, event_bus=bus)
+
+    seen_errors: set[str] = set()
+
+    ansi = re.compile(r"\x1b\[[0-9;]*m")
+
+    async def on_started(payload):
+        if args.verbose:
+            vid = payload.get("video_id")
+            target = payload.get("target")
+            print(f"START: {vid} → {target}")
+
+    async def on_completed(payload):
+        vid = payload.get("video_id")
+        target = payload.get("target")
+        print(f"OK: {vid} → {target}")
+
+    async def on_failed(payload):
+        raw = str(payload.get("error", "failed"))
+        msg = ansi.sub("", raw)
+        # Print only once per unique message
+        if msg not in seen_errors:
+            seen_errors.add(msg)
+            # Friendly hint for missing ffmpeg
+            if "ffmpeg not found" in msg.lower():
+                print("ERROR: ffmpeg not found. Install ffmpeg or set 'ffmpeg_path' in config.")
+            else:
+                print(f"ERROR: {msg}")
+
+    # Subscribe to key events
+    bus.subscribe("DownloadStarted", on_started)
+    bus.subscribe("DownloadCompleted", on_completed)
+    bus.subscribe("DownloadFailed", on_failed)
+    if args.verbose:
+        async def on_rename(payload):
+            print(f"RENAME: {payload.get('video_id')} → {payload.get('to')}")
+        async def on_recycle(payload):
+            print(f"RECYCLE: {payload.get('video_id')} ← {payload.get('name')}")
+        bus.subscribe("RenameApplied", on_rename)
+        bus.subscribe("FileRecycled", on_recycle)
+
+    playlists = settings.playlists
+    if args.playlist is not None:
+        playlists = [playlists[args.playlist]] if 0 <= args.playlist < len(playlists) else []
+
+    for pl in playlists:
+        url = pl.get("url")
+        pid = extract_playlist_id(url) or (url or "")
+        try:
+            actions = service.sync_from_config(pl)
+        except ImportError as e:
+            msg = str(e)
+            if "yt_dlp" in msg or "yt-dlp" in msg:
+                print("yt-dlp Python package is required. Install with: pip install -U yt-dlp")
+                return 2
+            raise
+        counts: dict[str, int] = {}
+        for a in actions:
+            counts[a.type.name] = counts.get(a.type.name, 0) + 1
+        summary = ", ".join(f"{k}:{v}" for k, v in sorted(counts.items()))
+        print(f"Playlist {pid}: {len(actions)} actions → {summary}")
+        log.info("playlist=%s actions=%s summary=%s", pid, len(actions), summary)
+        if args.apply and actions:
+            try:
+                asyncio.run(executor.execute(actions, pl))
+            except DependencyError as e:
+                print(f"ERROR: {e}")
+                log.error("dependency error: %s", e)
+                return 2
+            db.set_playlist_last_sync(pid)
+            print(f"Applied actions for {pid}.")
+            log.info("playlist=%s applied_actions=%s", pid, len(actions))
+
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

src/app/config/__init__.py

@@ -0,0 +1 @@
+"""Config loader for the new backend (separate from legacy)."""

src/app/config/settings.py

@@ -0,0 +1,81 @@
+from __future__ import annotations
+
+import json
+import os
+from pathlib import Path
+from typing import Any, Dict, List
+
+
+def _default_ffmpeg_path() -> str:
+    if os.name == "nt":
+        return "./bin/ffmpeg.exe"
+    return "./bin/ffmpeg"
+
+
+DEFAULT_CONFIG: Dict[str, Any] = {
+    "playlists": [],
+    "download_mode": "video",
+    "max_download_quality": "1080p",
+    "save_path": "./downloads",
+    "ffmpeg_path": _default_ffmpeg_path(),
+    "max_parallel_downloads": 2,
+    "retry_max_retries": 2,
+    "retry_delay_seconds": 1.5,
+}
+
+
+class Settings:
+    def __init__(self) -> None:
+        base_dir = Path("config")
+        base_dir.mkdir(parents=True, exist_ok=True)
+        self.path = (base_dir / "yt-playlist-config.json").resolve()
+        self.data: Dict[str, Any] = dict(DEFAULT_CONFIG)
+
+        # Ensure there is always a config file at the default path.
+        if not self.path.exists():
+            self._write_default_config(self.path)
+
+        self._load_from_path(self.path)
+
+    def _load_from_path(self, path: Path) -> None:
+        try:
+            self.data.update(json.loads(path.read_text(encoding="utf-8")))
+        except Exception:
+            # Leave defaults if invalid JSON; validation can be added later.
+            pass
+
+    def _write_default_config(self, path: Path) -> None:
+        path.parent.mkdir(parents=True, exist_ok=True)
+        default_payload: Dict[str, Any] = {
+            "playlists": [
+                {
+                    "url": "https://www.youtube.com/playlist?list=YOUR_PLAYLIST_ID",
+                    "download_mode": "video",
+                    "max_download_quality": "1080p",
+                    "save_path": "./downloads",
+                }
+            ],
+            "ffmpeg_path": _default_ffmpeg_path(),
+        }
+        path.write_text(json.dumps(default_payload, indent=2) + "\n", encoding="utf-8")
+
+    @property
+    def playlists(self) -> List[Dict[str, Any]]:
+        global_defaults = {
+            "download_mode": self.data.get("download_mode", DEFAULT_CONFIG["download_mode"]),
+            "max_download_quality": self.data.get("max_download_quality", DEFAULT_CONFIG["max_download_quality"]),
+            "save_path": self.data.get("save_path", DEFAULT_CONFIG["save_path"]),
+            "ffmpeg_path": self.data.get("ffmpeg_path", DEFAULT_CONFIG["ffmpeg_path"]),
+            "max_parallel_downloads": self.data.get("max_parallel_downloads", DEFAULT_CONFIG["max_parallel_downloads"]),
+            "retry_max_retries": self.data.get("retry_max_retries", DEFAULT_CONFIG["retry_max_retries"]),
+            "retry_delay_seconds": self.data.get("retry_delay_seconds", DEFAULT_CONFIG["retry_delay_seconds"]),
+        }
+
+        results: List[Dict[str, Any]] = []
+        for pl in list(self.data.get("playlists", [])):
+            if not isinstance(pl, dict):
+                continue
+            merged = dict(global_defaults)
+            merged.update(pl)
+            results.append(merged)
+        return results

src/app/core/__init__.py

@@ -0,0 +1,10 @@
+"""Core backend modules (scanner, sync, download, db, scheduler, events)."""
+
+__all__ = [
+    "scanner",
+    "sync",
+    "download",
+    "database",
+    "scheduler",
+    "events",
+]

src/app/core/database/__init__.py

@@ -0,0 +1 @@
+"""Database helpers (SQLite)."""

src/app/core/database/db.py

@@ -0,0 +1,124 @@
+from __future__ import annotations
+
+import sqlite3
+from pathlib import Path
+from typing import Iterable
+
+
+SCHEMA = """
+PRAGMA journal_mode=WAL;
+
+CREATE TABLE IF NOT EXISTS playlists (
+    id TEXT PRIMARY KEY,
+    name TEXT,
+    url TEXT,
+    path TEXT,
+    mode TEXT,
+    auto_sync INTEGER,
+    sync_interval_minutes INTEGER,
+    last_sync TEXT
+);
+
+CREATE TABLE IF NOT EXISTS playlist_items (
+    playlist_id TEXT,
+    video_id TEXT,
+    title TEXT,
+    playlist_index INTEGER,
+    local_filename TEXT,
+    downloaded INTEGER,
+    last_seen TEXT,
+    PRIMARY KEY (playlist_id, video_id)
+);
+"""
+
+
+class Database:
+    """Thin SQLite persistence layer for playlists and playlist items.
+
+    The database stores the local synchronization state so the sync pipeline
+    can compare remote playlist data with what has already been downloaded,
+    renamed, or marked as removed.
+    """
+
+    def __init__(self, db_path: Path) -> None:
+        self.path = db_path
+        self.path.parent.mkdir(parents=True, exist_ok=True)
+        self._conn = sqlite3.connect(self.path)
+        self._conn.row_factory = sqlite3.Row
+        self._migrate()
+
+    def _migrate(self) -> None:
+        """Create the schema if this database has not been initialized yet."""
+        with self._conn:
+            self._conn.executescript(SCHEMA)
+
+    def upsert_playlist_items(self, rows: Iterable[tuple]):
+        """Insert or refresh the cached metadata for playlist entries."""
+        sql = (
+            "INSERT INTO playlist_items (playlist_id, video_id, title, playlist_index, local_filename, downloaded, last_seen) "
+            "VALUES (?, ?, ?, ?, ?, ?, datetime('now')) "
+            "ON CONFLICT(playlist_id, video_id) DO UPDATE SET "
+            "title=excluded.title, playlist_index=excluded.playlist_index, local_filename=excluded.local_filename, "
+            "downloaded=excluded.downloaded, last_seen=datetime('now')"
+        )
+        with self._conn:
+            self._conn.executemany(sql, rows)
+
+    def get_items_index(self, playlist_id: str) -> dict[str, sqlite3.Row]:
+        """Return all cached items for a playlist keyed by video id."""
+        cur = self._conn.execute(
+            "SELECT * FROM playlist_items WHERE playlist_id = ?",
+            (playlist_id,),
+        )
+        return {row["video_id"]: row for row in cur.fetchall()}
+
+    def upsert_playlist(self, *, id: str, name: str | None, url: str, path: str, mode: str, auto_sync: int = 0, sync_interval_minutes: int = 0) -> None:
+        """Insert or update the playlist configuration row."""
+        sql = (
+            "INSERT INTO playlists (id, name, url, path, mode, auto_sync, sync_interval_minutes, last_sync) "
+            "VALUES (?, ?, ?, ?, ?, ?, ?, NULL) "
+            "ON CONFLICT(id) DO UPDATE SET name=excluded.name, url=excluded.url, path=excluded.path, mode=excluded.mode, "
+            "auto_sync=excluded.auto_sync, sync_interval_minutes=excluded.sync_interval_minutes"
+        )
+        with self._conn:
+            self._conn.execute(sql, (id, name, url, path, mode, auto_sync, sync_interval_minutes))
+
+    def update_local_filename(self, playlist_id: str, video_id: str, local_filename: str | None) -> None:
+        """Record the current filename associated with a playlist item."""
+        with self._conn:
+            self._conn.execute(
+                "UPDATE playlist_items SET local_filename = ?, last_seen = datetime('now') WHERE playlist_id = ? AND video_id = ?",
+                (local_filename, playlist_id, video_id),
+            )
+
+    def mark_downloaded(self, playlist_id: str, video_id: str, downloaded: bool) -> None:
+        """Mark whether a playlist item is present on disk."""
+        with self._conn:
+            self._conn.execute(
+                "UPDATE playlist_items SET downloaded = ?, last_seen = datetime('now') WHERE playlist_id = ? AND video_id = ?",
+                (1 if downloaded else 0, playlist_id, video_id),
+            )
+
+    def clear_file_state(self, playlist_id: str, video_id: str) -> None:
+        """Clear filename and downloaded flags after a deletion or recycle."""
+        with self._conn:
+            self._conn.execute(
+                "UPDATE playlist_items SET local_filename = NULL, downloaded = 0, last_seen = datetime('now') WHERE playlist_id = ? AND video_id = ?",
+                (playlist_id, video_id),
+            )
+
+    def set_playlist_last_sync(self, playlist_id: str) -> None:
+        """Store the timestamp of the most recent successful sync."""
+        with self._conn:
+            self._conn.execute(
+                "UPDATE playlists SET last_sync = datetime('now') WHERE id = ?",
+                (playlist_id,),
+            )
+
+    def get_playlist_last_sync(self, playlist_id: str) -> str | None:
+        """Return the last sync timestamp for a playlist, if any."""
+        cur = self._conn.execute("SELECT last_sync FROM playlists WHERE id = ?", (playlist_id,))
+        row = cur.fetchone()
+        if not row:
+            return None
+        return row["last_sync"]

src/app/core/download/downloader.py

@@ -0,0 +1,199 @@
+from __future__ import annotations
+
+from typing import Optional
+
+from .queue_manager import DownloadJob, JobState
+
+
+class Downloader:
+    """
+    Thin wrapper around yt-dlp usage. For MVP, this is a placeholder
+    where actual download logic will land (audio/video/both).
+    """
+
+    def __init__(self, yt_dlp_path: Optional[str] = None, ffmpeg_path: Optional[str] = None) -> None:
+        self.yt_dlp_path = yt_dlp_path
+        self.ffmpeg_path = ffmpeg_path
+
+    @staticmethod
+    def build_format(max_download_quality) -> str:
+        def parse_height_cap(value) -> int | None:
+            if value is None:
+                return 1080
+            if isinstance(value, int):
+                return value if value > 0 else None
+            s = str(value).strip().lower()
+            if not s:
+                return 1080
+            if s in {"best", "max", "auto"}:
+                return None
+            if s in {"none", "null"}:
+                return 1080
+            digits = "".join(ch for ch in s if ch.isdigit())
+            if not digits:
+                return None
+            try:
+                cap = int(digits)
+            except Exception:
+                return None
+            return cap if cap > 0 else None
+
+        cap = parse_height_cap(max_download_quality)
+        if cap is not None:
+            #if the requested cap isn't available, we still download the best mp4.
+            return f"best[ext=mp4][acodec!=none][vcodec!=none][height<={cap}]/best[ext=mp4][height<={cap}]/best[ext=mp4]"
+        return "best[ext=mp4][acodec!=none][vcodec!=none]/best[ext=mp4]"
+
+    async def handle_job(self, job: DownloadJob):
+        try:
+            cancel_check = getattr(job, "cancel_check", None)
+            if callable(cancel_check) and cancel_check():
+                job.state = JobState.CANCELLED
+                job.error = "cancelled"
+                return
+            job.state = JobState.DOWNLOADING
+            await self._download(job)
+            # Optional local audio extraction when requested
+            if job.mode == "video" and job.audio_output_path is not None:
+                await self._extract_audio(job)
+                # Remove the video if requested (audio-only mode)
+                if not job.keep_video and job.output_path:
+                    try:
+                        job.output_path.unlink(missing_ok=True)
+                    except Exception:
+                        pass
+            job.state = JobState.COMPLETED
+        except Exception as exc:  # pragma: no cover - environment dependent
+            job.state = JobState.FAILED
+            job.error = str(exc)
+
+    async def _download(self, job: DownloadJob):
+        # Use yt-dlp Python API, executed in a worker thread
+        import asyncio
+
+        def run():
+            import yt_dlp  # type: ignore
+            from pathlib import Path
+            try:
+                from yt_dlp.utils import DownloadCancelled  # type: ignore
+            except Exception:  # pragma: no cover - optional
+                DownloadCancelled = Exception  # type: ignore[misc,assignment]
+
+            class _QuietLogger:
+                def debug(self, msg):
+                    pass
+                def warning(self, msg):
+                    pass
+                def error(self, msg):
+                    # swallow inner repeats; errors are surfaced via exceptions
+                    pass
+                def info(self, msg):
+                    pass
+
+            outtmpl = str(job.output_path)
+
+            fmt = self.build_format(getattr(job, "max_download_quality", None))
+
+            # All modes download a single muxed mp4 when possible.
+            # This avoids any ffmpeg-driven merging during the download step, satisfying:
+            #   - video: "original file, no processing"
+            #   - audio/both: extraction is done separately after download
+            ydl_opts = {
+                "format": fmt,
+                "outtmpl": outtmpl,
+                "noplaylist": True,
+                "quiet": True,
+                "no_warnings": True,
+                "logger": _QuietLogger(),
+            }
+
+            progress_cb = getattr(job, "progress_callback", None)
+            cancel_check = getattr(job, "cancel_check", None)
+            if progress_cb is not None:
+                def hook(d):
+                    try:
+                        if callable(cancel_check) and cancel_check():
+                            raise DownloadCancelled("cancelled")
+                        import time
+                        payload = {
+                            "status": d.get("status"),
+                            "downloaded_bytes": d.get("downloaded_bytes"),
+                            "total_bytes": d.get("total_bytes") or d.get("total_bytes_estimate"),
+                            "speed": d.get("speed"),
+                            "eta": d.get("eta"),
+                            "filename": d.get("filename"),
+                        }
+                        total = payload.get("total_bytes")
+                        done = payload.get("downloaded_bytes")
+                        if total and done is not None:
+                            payload["progress"] = float(done) / float(total)
+
+                        # Throttle progress events to avoid freezing the GUI event loop.
+                        # Always forward terminal states.
+                        status = str(payload.get("status") or "")
+                        now = time.monotonic()
+                        last_ts = float(getattr(job, "_last_progress_emit_ts", 0.0) or 0.0)
+                        last_pct = float(getattr(job, "_last_progress_emit_pct", -1.0) or -1.0)
+                        pct = float(payload.get("progress")) if isinstance(payload.get("progress"), (int, float)) else None
+
+                        should_emit = status in {"finished", "error"}
+                        if not should_emit:
+                            if now - last_ts >= 0.25:
+                                should_emit = True
+                            elif pct is not None and (last_pct < 0 or abs(pct - last_pct) >= 0.01):
+                                should_emit = True
+
+                        if should_emit:
+                            setattr(job, "_last_progress_emit_ts", now)
+                            if pct is not None:
+                                setattr(job, "_last_progress_emit_pct", pct)
+                            progress_cb(payload)
+                    except Exception:
+                        pass
+
+                ydl_opts["progress_hooks"] = [hook]
+
+            # If user provided an ffmpeg path, pass it through to yt-dlp so it doesn't rely on PATH.
+            ffmpeg_hint = getattr(job, "ffmpeg_path", None) or self.ffmpeg_path
+            if ffmpeg_hint:
+                try:
+                    p = Path(str(ffmpeg_hint))
+                    if p.exists():
+                        ydl_opts["ffmpeg_location"] = str(p)
+                except Exception:
+                    pass
+
+            with yt_dlp.YoutubeDL(ydl_opts) as ydl:  # type: ignore[attr-defined]
+                ydl.download([job.url])
+
+        await asyncio.to_thread(run)
+
+    async def _extract_audio(self, job: DownloadJob):
+        import asyncio
+        from shutil import which
+
+        src = job.output_path
+        dst = job.audio_output_path
+        if not src or not dst:
+            return
+
+        def run():
+            ffmpeg_exe = job.ffmpeg_path or self.ffmpeg_path or which("ffmpeg") or "ffmpeg"
+            import subprocess
+            cmd = [
+                str(ffmpeg_exe),
+                "-y",
+                "-i",
+                str(src),
+                "-vn",
+                "-codec:a",
+                "libmp3lame",
+                "-q:a",
+                "0",
+                str(dst),
+            ]
+            subprocess.run(cmd, check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+
+        # Mark converting state only for local clarity; not published
+        job.state = JobState.CONVERTING
+        await asyncio.to_thread(run)

src/app/core/download/queue_manager.py

@@ -0,0 +1,78 @@
+from __future__ import annotations
+
+import asyncio
+from dataclasses import dataclass
+from enum import Enum
+from pathlib import Path
+from typing import Any, Callable, Optional
+
+from ..models import PlaylistItem
+
+
+class JobState(str, Enum):
+    QUEUED = "Queued"
+    DOWNLOADING = "Downloading"
+    CONVERTING = "Converting"
+    COMPLETED = "Completed"
+    FAILED = "Failed"
+    SKIPPED = "Skipped"
+    CANCELLED = "Cancelled"
+
+
+@dataclass
+class DownloadJob:
+    item: PlaylistItem
+    output_path: Optional[Path] = None
+    url: Optional[str] = None
+    mode: str = "audio"  # audio|video
+    state: JobState = JobState.QUEUED
+    error: Optional[str] = None
+    ffmpeg_path: Optional[str] = None
+    max_download_quality: Optional[str] = None
+    playlist_id: Optional[str] = None
+    progress_callback: Optional[Callable[[dict[str, Any]], None]] = None
+    cancel_check: Optional[Callable[[], bool]] = None
+    audio_output_path: Optional[Path] = None  # when mode=video and we also want mp3
+    keep_video: bool = True
+
+
+class QueueManager:
+    """A small asyncio worker pool for download jobs.
+
+    Jobs are pushed into a shared queue and processed by a fixed number of
+    background tasks. This keeps the downloader concurrency bounded without
+    forcing the caller to manage worker lifetimes directly.
+    """
+
+    def __init__(self, concurrency: int = 2) -> None:
+        self._queue: "asyncio.Queue[DownloadJob]" = asyncio.Queue()
+        self._concurrency = max(1, concurrency)
+        self._workers: list[asyncio.Task[None]] = []
+        self._stopped = asyncio.Event()
+
+    async def start(self, worker_coro):
+        """Start the worker tasks that drain the queue."""
+        async def runner(idx: int):
+            while not self._stopped.is_set():
+                job = await self._queue.get()
+                try:
+                    await worker_coro(job)
+                finally:
+                    self._queue.task_done()
+
+        self._workers = [asyncio.create_task(runner(i)) for i in range(self._concurrency)]
+
+    async def stop(self):
+        """Cancel all worker tasks and mark the queue as stopped."""
+        self._stopped.set()
+        for w in self._workers:
+            w.cancel()
+        self._workers.clear()
+
+    async def enqueue(self, job: DownloadJob):
+        """Add a job to the shared queue."""
+        await self._queue.put(job)
+
+    async def join(self) -> None:
+        """Block until every queued job has been acknowledged."""
+        await self._queue.join()

src/app/core/download/workers.py

@@ -0,0 +1,37 @@
+from __future__ import annotations
+
+import asyncio
+import logging
+from .downloader import Downloader
+from .queue_manager import DownloadJob, JobState
+from ..utils.rate_limit import is_youtube_rate_limit_error
+
+
+async def default_worker(job: DownloadJob, *, max_retries: int = 2, delay_seconds: float = 1.5):
+    log = logging.getLogger(__name__)
+    dl = Downloader(ffmpeg_path=job.ffmpeg_path)
+    attempt = 0
+    while attempt <= max_retries:
+        await dl.handle_job(job)
+        if job.state == JobState.CANCELLED:
+            return
+        if job.state == JobState.COMPLETED:
+            return
+        if is_youtube_rate_limit_error(job.error):
+            # Do not retry bot-check/rate-limit style errors; caller will pause.
+            return
+        if (job.error or "").strip().lower() == "cancelled":
+            job.state = JobState.CANCELLED
+            return
+        attempt += 1
+        if attempt <= max_retries:
+            wait = delay_seconds * (2 ** (attempt - 1))
+            log.warning(
+                "retrying download attempt=%s/%s video_id=%s wait=%.1fs error=%s",
+                attempt,
+                max_retries,
+                getattr(getattr(job, "item", None), "video_id", None),
+                wait,
+                job.error,
+            )
+            await asyncio.sleep(wait)

src/app/core/events/event_bus.py

@@ -0,0 +1,21 @@
+from __future__ import annotations
+
+from collections import defaultdict
+from typing import Any, Awaitable, Callable, DefaultDict, Dict, List
+
+
+EventHandler = Callable[[Dict[str, Any]], Awaitable[None]]
+
+
+class EventBus:
+    """Simple async pub/sub event bus used by backend and (later) GUI."""
+
+    def __init__(self) -> None:
+        self._subs: DefaultDict[str, List[EventHandler]] = defaultdict(list)
+
+    def subscribe(self, event_name: str, handler: EventHandler) -> None:
+        self._subs[event_name].append(handler)
+
+    async def publish(self, event_name: str, payload: Dict[str, Any]) -> None:
+        for h in list(self._subs.get(event_name, [])):
+            await h(payload)

src/app/core/models.py

@@ -0,0 +1,56 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from enum import Enum
+from pathlib import Path
+from typing import Optional
+
+
+class DownloadMode(str, Enum):
+    audio = "audio"
+    video = "video"
+    both = "both"
+
+
+@dataclass(frozen=True)
+class Playlist:
+    id: str
+    name: Optional[str]
+    url: str
+    path: Path
+    mode: DownloadMode = DownloadMode.audio
+    auto_sync: bool = False
+    sync_interval_minutes: int = 0
+
+
+@dataclass(frozen=True)
+class PlaylistItem:
+    playlist_id: str
+    video_id: str
+    title: str
+    playlist_index: int
+    local_filename: Optional[str] = None
+    downloaded: bool = False
+
+
+class SyncActionType(str, Enum):
+    DOWNLOAD = "DOWNLOAD"
+    DELETE = "DELETE"
+    RENAME = "RENAME"
+    REORDER = "REORDER"
+    SKIP = "SKIP"
+    REPAIR = "REPAIR"
+
+
+@dataclass(frozen=True)
+class SyncAction:
+    type: SyncActionType
+    item: Optional[PlaylistItem] = None
+    from_name: Optional[str] = None
+    to_name: Optional[str] = None
+
+
+@dataclass(frozen=True)
+class FilesystemEntry:
+    name: str
+    path: Path

src/app/core/scanner/playlist_scanner.py

@@ -0,0 +1,67 @@
+from __future__ import annotations
+
+from pathlib import Path
+from typing import List, Optional
+
+from ..models import PlaylistItem
+
+
+class PlaylistScanner:
+    """
+    Fetches remote playlist entries using yt-dlp without downloading media.
+
+    The scanner is deliberately lightweight: it extracts remote metadata only
+    and leaves persistence, diffing, and download decisions to higher layers.
+    Import-time dependency checks are avoided so the rest of the application can
+    still start in environments where yt-dlp is unavailable.
+    """
+
+    def __init__(self) -> None:
+        pass
+
+    def scan(self, playlist_url: str, playlist_id: str, *, ffmpeg_path: Optional[str] = None) -> List[PlaylistItem]:
+        """Return the current remote playlist entries as `PlaylistItem` records."""
+        try:
+            import yt_dlp  # type: ignore
+        except Exception as exc:  # pragma: no cover - environment dependent
+            raise ImportError("yt_dlp is required to scan playlists") from exc
+
+        ydl_opts = {
+            "extract_flat": True,
+            "skip_download": True,
+            "quiet": True,
+            "dump_single_json": True,
+        }
+
+        # If a local ffmpeg binary is configured, pass it through so yt-dlp doesn't rely on PATH.
+        if ffmpeg_path:
+            try:
+                p = Path(str(ffmpeg_path))
+                if p.exists():
+                    ydl_opts["ffmpeg_location"] = str(p)
+            except Exception:
+                pass
+
+        with yt_dlp.YoutubeDL(ydl_opts) as ydl:  # type: ignore[attr-defined]
+            info = ydl.extract_info(playlist_url, download=False)
+
+        entries = info.get("entries", []) if isinstance(info, dict) else []
+        items: List[PlaylistItem] = []
+        for idx, v in enumerate(entries, start=1):
+            if not v:
+                continue
+            title = v.get("title") or "[Unknown]"
+            if title in ("[Deleted video]", "[Private video]"):
+                continue
+            vid = v.get("id") or ""
+            if not vid:
+                continue
+            items.append(
+                PlaylistItem(
+                    playlist_id=playlist_id,
+                    video_id=vid,
+                    title=title,
+                    playlist_index=idx,
+                )
+            )
+        return items

src/app/core/scheduler/scheduler.py

@@ -0,0 +1,20 @@
+from __future__ import annotations
+
+from datetime import timedelta
+from typing import Awaitable, Callable
+
+
+class Scheduler:
+    """
+    Lightweight placeholder for background scheduling. This can later be
+    swapped for APScheduler without changing call sites.
+    """
+
+    def __init__(self) -> None:
+        self._jobs: list[tuple[timedelta, Callable[[], Awaitable[None]]]] = []
+
+    def every(self, interval: timedelta, coro_factory: Callable[[], Awaitable[None]]):
+        self._jobs.append((interval, coro_factory))
+        return self
+
+    # A full implementation will run an event loop and await jobs.

src/app/core/sync/diff_engine.py

@@ -0,0 +1,62 @@
+from __future__ import annotations
+
+from typing import Iterable, List, Mapping, Sequence
+
+from ..models import FilesystemEntry, PlaylistItem, SyncAction, SyncActionType
+
+
+class DiffEngine:
+    """
+    Compares remote playlist items, database state, and filesystem to
+    produce a list of actions. Initial MVP computes DOWNLOAD/RENAME/DELETE
+    based on simple filename scheme "0001 - Title.ext".
+    """
+
+    def compute_actions(
+        self,
+        remote: Sequence[PlaylistItem],
+        db_index: Mapping[str, PlaylistItem],
+        fs_entries: Iterable[FilesystemEntry],
+        extension: str,
+    ) -> List[SyncAction]:
+        actions: List[SyncAction] = []
+
+        desired_names = {
+            item.video_id: f"{item.playlist_index:04d} - {item.title}{extension}"
+            for item in remote
+        }
+
+        fs_by_name = {e.name: e for e in fs_entries}
+
+        for item in remote:
+            desired_name = desired_names[item.video_id]
+            # If DB knows the current local filename and it already matches and exists -> nothing to do
+            if item.local_filename == desired_name and desired_name in fs_by_name:
+                continue
+
+            # If DB knows a different current filename and it exists -> plan a rename
+            if item.local_filename and item.local_filename in fs_by_name and item.local_filename != desired_name:
+                actions.append(
+                    SyncAction(
+                        SyncActionType.RENAME,
+                        item=item,
+                        from_name=item.local_filename,
+                        to_name=desired_name,
+                    )
+                )
+                continue
+
+            # If the desired file already exists on disk but DB doesn't reflect it -> skip (already correct)
+            if desired_name in fs_by_name:
+                actions.append(SyncAction(SyncActionType.SKIP, item=item, to_name=desired_name))
+                continue
+
+            # Otherwise, we need to download
+            actions.append(SyncAction(SyncActionType.DOWNLOAD, item=item, to_name=desired_name))
+
+        known_ids = {i.video_id for i in remote}
+        for vid, db_item in db_index.items():
+            if vid not in known_ids and db_item.local_filename:
+                actions.append(SyncAction(SyncActionType.DELETE, item=db_item, from_name=db_item.local_filename))
+
+        return actions

src/app/core/sync/executor.py

@@ -0,0 +1,420 @@
+from __future__ import annotations
+
+import asyncio
+import time
+import shutil
+from pathlib import Path
+from typing import Iterable, List
+
+from ..download.queue_manager import DownloadJob, QueueManager
+from ..download.workers import default_worker
+from ..models import SyncAction, SyncActionType
+from ..sync.reorder import safe_multi_rename
+from ..database.db import Database
+from ..utils.yt import extract_playlist_id
+from ..events.event_bus import EventBus
+from ..utils.deps import ensure_ffmpeg_available, ensure_yt_dlp_available
+from ..utils.rate_limit import is_youtube_rate_limit_error
+
+
+class ActionExecutor:
+    """Apply sync actions against the filesystem and persist their outcome.
+
+    The executor is the imperative half of the sync pipeline: it publishes
+    lifecycle events, performs safe renames and deletions, coordinates the
+    download queue, and updates the database after each job completes.
+    """
+
+    def __init__(self, db: Database, concurrency: int = 2, event_bus: EventBus | None = None) -> None:
+        self.concurrency = max(1, concurrency)
+        self.db = db
+        self.bus = event_bus
+
+    async def execute(self, actions: Iterable[SyncAction], playlist_cfg: dict, *, cancel_check=None, pause_check=None) -> None:
+        """Execute a batch of sync actions for one playlist.
+
+        The workflow is intentionally ordered: announce the sync, wait for any
+        pause state to clear, validate dependencies, perform renames, recycle
+        deletions, and finally run downloads with bounded concurrency.
+        """
+        actions_list = list(actions)
+        playlist_id = extract_playlist_id(playlist_cfg.get("url", "")) or playlist_cfg.get("url", "")
+        start = time.monotonic()
+        counts: dict[str, int] = {}
+        for a in actions_list:
+            counts[a.type.name] = counts.get(a.type.name, 0) + 1
+
+        if self.bus:
+            await self.bus.publish(
+                "SyncStarted",
+                {
+                    "playlist_id": playlist_id,
+                    "actions_total": sum(counts.values()),
+                    "counts": dict(counts),
+                },
+            )
+
+        if not await self._wait_if_paused(pause_check, cancel_check):
+            return
+        self._preflight_dependencies(actions_list, playlist_cfg)
+
+        save_path = Path(playlist_cfg.get("save_path", "./downloads")).resolve()
+        mode = playlist_cfg.get("download_mode", "video")
+
+        # Prepare roots
+        audio_root = save_path / "audio"
+        video_root = save_path / "video"
+        audio_root.mkdir(parents=True, exist_ok=True)
+        video_root.mkdir(parents=True, exist_ok=True)
+
+        # First, handle renames safely in batch per extension
+        if not await self._wait_if_paused(pause_check, cancel_check):
+            return
+        await self._apply_renames(actions_list, audio_root, video_root, playlist_cfg)
+
+        # Then, recycle deletions
+        if not await self._wait_if_paused(pause_check, cancel_check):
+            return
+        self._apply_deletions(actions_list, audio_root, video_root, playlist_cfg)
+
+        # Finally, perform downloads concurrently
+        if not await self._wait_if_paused(pause_check, cancel_check):
+            return
+        await self._apply_downloads(
+            actions_list,
+            mode,
+            audio_root,
+            video_root,
+            playlist_cfg,
+            cancel_check=cancel_check,
+            pause_check=pause_check,
+        )
+
+        duration_s = round(time.monotonic() - start, 3)
+        # Persist last sync timestamp (single source of truth for CLI/GUI/automation).
+        try:
+            self.db.set_playlist_last_sync(playlist_id)
+            last_sync = self.db.get_playlist_last_sync(playlist_id)
+        except Exception:
+            last_sync = None
+        summary = {
+            "playlist_id": playlist_id,
+            "duration_s": duration_s,
+            "counts": dict(counts),
+            "last_sync": last_sync,
+        }
+        if self.bus:
+            await self.bus.publish("SyncSummary", dict(summary))
+            await self.bus.publish("SyncFinished", dict(summary))
+
+    async def _wait_if_paused(self, pause_check, cancel_check) -> bool:
+        if not callable(pause_check):
+            return True
+        while pause_check():
+            if callable(cancel_check) and cancel_check():
+                return False
+            await asyncio.sleep(0.1)
+        return True
+
+    def _preflight_dependencies(self, actions: Iterable[SyncAction], playlist_cfg: dict) -> None:
+        """
+        Fail fast on core runtime dependencies before doing any filesystem work.
+
+        This keeps errors consistent regardless of entrypoint (CLI, bootstrap, tests, etc.).
+        """
+        needs_download = any(a.type == SyncActionType.DOWNLOAD for a in actions)
+        if not needs_download:
+            return
+
+        # yt-dlp is required for any download job (Python API usage)
+        ensure_yt_dlp_available()
+
+        # ffmpeg is only required when we will extract audio (audio/both modes)
+        needs_audio = any((a.to_name or "").lower().endswith(".mp3") for a in actions if a.type == SyncActionType.DOWNLOAD)
+        if needs_audio:
+            ffmpeg_hint = playlist_cfg.get("ffmpeg_path", "ffmpeg")
+            ensure_ffmpeg_available(str(ffmpeg_hint) if ffmpeg_hint is not None else None)
+
+    async def _apply_renames(self, actions: Iterable[SyncAction], audio_root: Path, video_root: Path, playlist_cfg: dict) -> None:
+        """Apply all rename actions in batches separated by output type."""
+        playlist_id = extract_playlist_id(playlist_cfg.get("url", "")) or playlist_cfg.get("url", "")
+        audio_renames = []
+        video_renames = []
+        applied: List[SyncAction] = []
+        for a in actions:
+            if a.type != SyncActionType.RENAME or not a.from_name or not a.to_name:
+                continue
+            if a.to_name.endswith(".mp3"):
+                audio_renames.append((audio_root / a.from_name, audio_root / a.to_name))
+            elif a.to_name.endswith(".mp4"):
+                video_renames.append((video_root / a.from_name, video_root / a.to_name))
+            applied.append(a)
+
+        if audio_renames:
+            safe_multi_rename(audio_renames)
+        if video_renames:
+            safe_multi_rename(video_renames)
+
+        # Update DB filenames after successful rename attempts
+        for a in applied:
+            if a.item and a.to_name:
+                try:
+                    self.db.update_local_filename(playlist_id, a.item.video_id, a.to_name)
+                except Exception:
+                    pass
+                if self.bus:
+                    await self.bus.publish("RenameApplied", {"playlist_id": playlist_id, "video_id": a.item.video_id, "to": a.to_name})
+
+    def _apply_deletions(self, actions: Iterable[SyncAction], audio_root: Path, video_root: Path, playlist_cfg: dict) -> None:
+        """Recycle or remove files that no longer belong to the playlist."""
+        playlist_id = extract_playlist_id(playlist_cfg.get("url", "")) or playlist_cfg.get("url", "")
+        recycle_audio = audio_root.parent / ".recycle" / "audio"
+        recycle_video = video_root.parent / ".recycle" / "video"
+        recycle_audio.mkdir(parents=True, exist_ok=True)
+        recycle_video.mkdir(parents=True, exist_ok=True)
+
+        for a in actions:
+            if a.type != SyncActionType.DELETE or not a.from_name:
+                continue
+            if a.from_name.endswith(".mp3"):
+                src = audio_root / a.from_name
+                dst = recycle_audio / a.from_name
+            else:
+                src = video_root / a.from_name
+                dst = recycle_video / a.from_name
+            if src.exists():
+                try:
+                    if dst.exists():
+                        dst.unlink()
+                    shutil.move(str(src), str(dst))
+                except Exception:
+                    # fallback to delete if move fails
+                    try:
+                        src.unlink()
+                    except Exception:
+                        pass
+            # Update DB to clear file state
+            if a.item:
+                try:
+                    self.db.clear_file_state(playlist_id, a.item.video_id)
+                except Exception:
+                    pass
+                if self.bus:
+                    asyncio.create_task(self.bus.publish("FileRecycled", {"playlist_id": playlist_id, "video_id": a.item.video_id, "name": a.from_name}))
+
+    async def _apply_downloads(
+        self,
+        actions: Iterable[SyncAction],
+        mode: str,
+        audio_root: Path,
+        video_root: Path,
+        playlist_cfg: dict,
+        *,
+        cancel_check=None,
+        pause_check=None,
+    ) -> None:
+        """Queue and run download jobs, then persist their final state."""
+        playlist_id = extract_playlist_id(playlist_cfg.get("url", "")) or playlist_cfg.get("url", "")
+        loop = asyncio.get_running_loop()
+        concurrency_cfg = playlist_cfg.get("max_parallel_downloads", self.concurrency)
+        try:
+            concurrency = int(concurrency_cfg) if concurrency_cfg is not None else self.concurrency
+        except Exception:
+            concurrency = self.concurrency
+        queue = QueueManager(concurrency=concurrency)
+
+        retry_max_cfg = playlist_cfg.get("retry_max_retries", 2)
+        retry_delay_cfg = playlist_cfg.get("retry_delay_seconds", 1.5)
+        try:
+            retry_max_retries = int(retry_max_cfg) if retry_max_cfg is not None else 2
+        except Exception:
+            retry_max_retries = 2
+        try:
+            retry_delay_seconds = float(retry_delay_cfg) if retry_delay_cfg is not None else 1.5
+        except Exception:
+            retry_delay_seconds = 1.5
+
+        delay_cfg = playlist_cfg.get("delay_between_downloads_seconds", 0.0)
+        try:
+            delay_between_downloads_seconds = float(delay_cfg) if delay_cfg is not None else 0.0
+        except Exception:
+            delay_between_downloads_seconds = 0.0
+
+        rate_limit_pause = asyncio.Event()
+        rate_limit_emitted = False
+
+        async def worker(job: DownloadJob):
+            nonlocal rate_limit_emitted
+            job.playlist_id = playlist_id
+            job.cancel_check = cancel_check
+            if not await self._wait_if_paused(pause_check, cancel_check):
+                job.error = "cancelled"
+                return
+
+            if self.bus:
+                def _progress_cb(info: dict):
+                    payload = dict(info)
+                    payload.setdefault("playlist_id", playlist_id)
+                    if job.item:
+                        payload.setdefault("video_id", job.item.video_id)
+                    loop.call_soon_threadsafe(asyncio.create_task, self.bus.publish("DownloadProgress", payload))
+
+                job.progress_callback = _progress_cb
+
+            if self.bus and job.item:
+                await self.bus.publish("DownloadStarted", {"playlist_id": playlist_id, "video_id": job.item.video_id, "target": str(job.output_path)})
+            await default_worker(job, max_retries=retry_max_retries, delay_seconds=retry_delay_seconds)
+
+            # If we hit YouTube bot-check / rate-limit, pause the whole playlist sync:
+            # - stop scheduling/processing more jobs
+            # - surface a single SyncPaused event
+            if is_youtube_rate_limit_error(getattr(job, "error", None)):
+                rate_limit_pause.set()
+                if self.bus and not rate_limit_emitted:
+                    rate_limit_emitted = True
+                    await self.bus.publish(
+                        "SyncPaused",
+                        {"playlist_id": playlist_id, "video_id": getattr(getattr(job, "item", None), "video_id", None), "reason": "paused due to youtube rate limits"},
+                    )
+                return
+
+            if delay_between_downloads_seconds > 0 and not (callable(cancel_check) and cancel_check()):
+                # Gentle throttle between jobs to reduce rate limiting.
+                await asyncio.sleep(delay_between_downloads_seconds)
+
+        await queue.start(worker)
+        try:
+            jobs: List[DownloadJob] = []
+
+            # Collapse 'both' into single video download + local audio extraction
+            # Build per-video desired outputs
+            by_vid: dict[str, dict[str, str]] = {}
+            for a in actions:
+                if a.type != SyncActionType.DOWNLOAD or not a.item or not a.to_name:
+                    continue
+                d = by_vid.setdefault(a.item.video_id, {})
+                if a.to_name.endswith(".mp3"):
+                    d["audio"] = a.to_name
+                elif a.to_name.endswith(".mp4"):
+                    d["video"] = a.to_name
+
+            ffmpeg_cfg = str(playlist_cfg.get("ffmpeg_path", "ffmpeg")) if playlist_cfg.get("ffmpeg_path") is not None else None
+            max_quality_cfg = playlist_cfg.get("max_download_quality")
+            temp_video_root = video_root / ".tmp"
+            temp_video_root.mkdir(parents=True, exist_ok=True)
+
+            for a in actions:
+                if callable(cancel_check) and cancel_check():
+                    break
+                if not await self._wait_if_paused(pause_check, cancel_check):
+                    break
+                if rate_limit_pause.is_set():
+                    break
+                if a.type != SyncActionType.DOWNLOAD or not a.item or not a.to_name:
+                    continue
+                vid = a.item.video_id
+                targets = by_vid.get(vid, {})
+
+                # If both audio and video requested for this video id, enqueue only video job with audio_output_path
+                if targets.get("audio") and targets.get("video"):
+                    # only create job once, when encountering the video target
+                    if a.to_name.endswith(".mp4"):
+                        video_path = video_root / targets["video"]
+                        audio_path = audio_root / targets["audio"]
+                        for p in (video_path.parent, audio_path.parent):
+                            p.mkdir(parents=True, exist_ok=True)
+                        url = f"https://www.youtube.com/watch?v={vid}"
+                        job = DownloadJob(
+                            item=a.item,
+                            output_path=video_path,
+                            url=url,
+                            mode="video",
+                            ffmpeg_path=ffmpeg_cfg,
+                            max_download_quality=max_quality_cfg,
+                            audio_output_path=audio_path,
+                        )
+                        jobs.append(job)
+                        await queue.enqueue(job)
+                    # skip creating a separate audio job
+                    continue
+
+                # Normal single-output path
+                is_audio = a.to_name.endswith(".mp3")
+                url = f"https://www.youtube.com/watch?v={vid}"
+
+                if is_audio:
+                    # Audio-only: download video to temp, extract mp3, then delete video
+                    audio_path = audio_root / a.to_name
+                    audio_path.parent.mkdir(parents=True, exist_ok=True)
+                    # build temp video filename from audio base
+                    temp_base = a.to_name.rsplit(".", 1)[0] + ".mp4"
+                    video_temp = temp_video_root / temp_base
+                    job = DownloadJob(
+                        item=a.item,
+                        output_path=video_temp,
+                        url=url,
+                        mode="video",
+                        ffmpeg_path=ffmpeg_cfg,
+                        max_download_quality=max_quality_cfg,
+                        audio_output_path=audio_path,
+                        keep_video=False,
+                    )
+                    jobs.append(job)
+                    await queue.enqueue(job)
+                else:
+                    # Video-only
+                    video_path = video_root / a.to_name
+                    video_path.parent.mkdir(parents=True, exist_ok=True)
+                    job = DownloadJob(
+                        item=a.item,
+                        output_path=video_path,
+                        url=url,
+                        mode="video",
+                        ffmpeg_path=ffmpeg_cfg,
+                        max_download_quality=max_quality_cfg,
+                    )
+                    jobs.append(job)
+                    await queue.enqueue(job)
+        finally:
+            join_task = asyncio.create_task(queue.join())
+            try:
+                while not join_task.done():
+                    if callable(cancel_check) and cancel_check():
+                        join_task.cancel()
+                        break
+                    if callable(pause_check) and pause_check():
+                        # Pause requested: stop starting more work and return control.
+                        join_task.cancel()
+                        break
+                    if rate_limit_pause.is_set():
+                        join_task.cancel()
+                        break
+                    await asyncio.sleep(0.1)
+            finally:
+                await queue.stop()
+
+        # Persist DB updates for completed jobs
+        for job in locals().get("jobs", []):
+            if job.item and job.output_path:
+                try:
+                    if job.state.name == "COMPLETED":
+                        # Prefer audio filename if produced
+                        final_name = job.audio_output_path.name if job.audio_output_path is not None else job.output_path.name
+                        self.db.update_local_filename(playlist_id, job.item.video_id, final_name)
+                        self.db.mark_downloaded(playlist_id, job.item.video_id, True)
+                        if self.bus:
+                            await self.bus.publish("DownloadCompleted", {"playlist_id": playlist_id, "video_id": job.item.video_id, "target": str(job.audio_output_path or job.output_path)})
+                    else:
+                        # Ensure not marked as downloaded if failed
+                        self.db.mark_downloaded(playlist_id, job.item.video_id, False)
+                        if self.bus:
+                            err = job.error or "unknown"
+                            if is_youtube_rate_limit_error(err):
+                                await self.bus.publish(
+                                    "DownloadFailed",
+                                    {"playlist_id": playlist_id, "video_id": job.item.video_id, "error": "paused due to youtube rate limits"},
+                                )
+                            else:
+                                await self.bus.publish("DownloadFailed", {"playlist_id": playlist_id, "video_id": job.item.video_id, "error": err})
+                except Exception:
+                    pass

src/app/core/sync/filesystem.py

@@ -0,0 +1,17 @@
+from __future__ import annotations
+
+from pathlib import Path
+from typing import List, Sequence
+
+from ..models import FilesystemEntry
+
+
+def list_files(root: Path, extensions: Sequence[str]) -> List[FilesystemEntry]:
+    exts = {e.lower() for e in extensions}
+    results: List[FilesystemEntry] = []
+    if not root.exists():
+        return results
+    for p in root.glob("**/*"):
+        if p.is_file() and p.suffix.lower() in exts:
+            results.append(FilesystemEntry(name=p.name, path=p))
+    return results

src/app/core/sync/reorder.py

@@ -0,0 +1,43 @@
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Dict, Iterable, Tuple
+
+
+def safe_multi_rename(renames: Iterable[Tuple[Path, Path]]) -> None:
+    """
+    Apply multiple renames safely using a two-pass strategy to avoid
+    name collisions. Each item is a tuple (src_path, dst_path).
+    """
+    temp_suffix = ".renametemp"
+    planned = list(renames)
+    existing_dests = {dst for _, dst in planned}
+
+    # Pass 1: move all sources that would collide to temporary names
+    temps: Dict[Path, Path] = {}
+    for src, dst in planned:
+        if not src.exists():
+            continue
+        if src.name == dst.name:
+            continue
+        # If destination exists or another source will become destination, use temp
+        if dst.exists() or dst in existing_dests:
+            tmp = src.with_suffix(src.suffix + temp_suffix)
+            # Ensure unique temp
+            i = 0
+            while tmp.exists():
+                i += 1
+                tmp = src.with_name(src.name + f".{i}" + temp_suffix)
+            src.rename(tmp)
+            temps[tmp] = dst
+        else:
+            # direct rename safe
+            src.rename(dst)
+
+    # Pass 2: move all temp files to their final destinations
+    for tmp, dst in temps.items():
+        if not tmp.exists():
+            continue
+        if dst.exists():
+            dst.unlink()
+        tmp.rename(dst)

src/app/core/sync/service.py

@@ -0,0 +1,134 @@
+from __future__ import annotations
+
+from pathlib import Path
+from typing import List
+
+from ..database.db import Database
+from ..models import PlaylistItem, SyncAction
+from ..scanner.playlist_scanner import PlaylistScanner
+from ..sync.diff_engine import DiffEngine
+from ..sync.filesystem import list_files
+from ..utils.naming import sanitize_title
+from ..utils.yt import extract_playlist_id
+
+
+class SyncService:
+    """High-level orchestration for a single playlist sync pass.
+
+    The service pulls the latest remote playlist snapshot, persists the
+    playlist and item metadata in the database, and asks the diff engine to
+    compare the remote state with the local filesystem.
+    """
+
+    def __init__(self, db: Database) -> None:
+        self.db = db
+        self.scanner = PlaylistScanner()
+        self.diff = DiffEngine()
+
+    def _mode_to_extensions(self, mode: str) -> list[str]:
+        if mode == "audio":
+            return [".mp3"]
+        if mode == "video":
+            return [".mp4"]
+        if mode == "both":
+            return [".mp3", ".mp4"]
+        return [".mp4"]
+
+    def sync_from_config(self, playlist_cfg: dict) -> List[SyncAction]:
+        """Return the sync actions required to bring one playlist in sync.
+
+        This method does not apply any changes itself. It normalizes the
+        configuration, refreshes the playlist/item records in SQLite, and then
+        computes the actions needed for the configured download mode.
+        """
+        url: str = playlist_cfg.get("url")
+        mode: str = playlist_cfg.get("download_mode", "video")
+        save_path = Path(playlist_cfg.get("save_path", "./downloads")).resolve()
+        save_path.mkdir(parents=True, exist_ok=True)
+
+        playlist_id = extract_playlist_id(url) or url
+        # Ensure playlist row exists/updated
+        self.db.upsert_playlist(
+            id=playlist_id,
+            name=playlist_cfg.get("name"),
+            url=url,
+            path=str(save_path),
+            mode=mode,
+            auto_sync=int(bool(playlist_cfg.get("auto_sync", False))),
+            sync_interval_minutes=int(playlist_cfg.get("sync_interval_minutes", 0) or 0),
+        )
+        ffmpeg_cfg = playlist_cfg.get("ffmpeg_path")
+        items = self.scanner.scan(url, playlist_id, ffmpeg_path=str(ffmpeg_cfg) if ffmpeg_cfg is not None else None)
+
+        sanitized: List[PlaylistItem] = []
+        for it in items:
+            safe_title = sanitize_title(it.title, it.video_id)
+            sanitized.append(
+                PlaylistItem(
+                    playlist_id=it.playlist_id,
+                    video_id=it.video_id,
+                    title=safe_title,
+                    playlist_index=it.playlist_index,
+                    local_filename=None,
+                    downloaded=False,
+                )
+            )
+
+        rows = [
+            (
+                it.playlist_id,
+                it.video_id,
+                it.title,
+                it.playlist_index,
+                None,
+                0,
+            )
+            for it in sanitized
+        ]
+        self.db.upsert_playlist_items(rows)
+
+        db_index_rows = self.db.get_items_index(playlist_id)
+        db_index: dict[str, PlaylistItem] = {}
+        for vid, row in db_index_rows.items():
+            db_index[vid] = PlaylistItem(
+                playlist_id=row["playlist_id"],
+                video_id=row["video_id"],
+                title=row["title"],
+                playlist_index=row["playlist_index"],
+                local_filename=row["local_filename"],
+                downloaded=bool(row["downloaded"]),
+            )
+
+        # Augment remote items with DB-known filenames/download flags
+        augmented: List[PlaylistItem] = []
+        for it in sanitized:
+            known = db_index.get(it.video_id)
+            if known is None:
+                augmented.append(it)
+            else:
+                augmented.append(
+                    PlaylistItem(
+                        playlist_id=it.playlist_id,
+                        video_id=it.video_id,
+                        title=it.title,
+                        playlist_index=it.playlist_index,
+                        local_filename=known.local_filename,
+                        downloaded=known.downloaded,
+                    )
+                )
+
+        exts = self._mode_to_extensions(mode)
+        merged_actions: List[SyncAction] = []
+
+        # Compute per-extension actions against respective roots
+        for ext in exts:
+            if ext == ".mp3":
+                fs = list_files(save_path / "audio", [".mp3"])
+            elif ext == ".mp4":
+                fs = list_files(save_path / "video", [".mp4"])
+            else:
+                fs = list_files(save_path, [ext])
+            actions = self.diff.compute_actions(augmented, db_index, fs, ext)
+            merged_actions.extend(actions)
+
+        return merged_actions

src/app/core/utils/__init__.py

@@ -0,0 +1 @@
+"""Utility helpers for naming, parsing, etc."""

src/app/core/utils/deps.py

@@ -0,0 +1,93 @@
+from __future__ import annotations
+
+import os
+import subprocess
+import sys
+from dataclasses import dataclass
+from pathlib import Path
+from shutil import which
+from typing import Optional, Tuple
+
+
+class DependencyError(RuntimeError):
+    pass
+
+
+@dataclass(frozen=True)
+class DependencyStatus:
+    yt_dlp_ok: bool
+    yt_dlp_version: Optional[str]
+    ffmpeg_ok: bool
+    ffmpeg_path: Optional[str]
+    ffprobe_ok: bool
+    ffprobe_path: Optional[str]
+
+
+def get_yt_dlp_version() -> Optional[str]:
+    try:
+        import yt_dlp  # type: ignore
+
+        # yt-dlp exposes version in different places depending on install
+        return getattr(yt_dlp, "__version__", None) or getattr(getattr(yt_dlp, "version", None), "__version__", None)
+    except Exception:
+        return None
+
+
+def ensure_yt_dlp_available() -> str:
+    """
+    Ensures yt-dlp Python package is importable. Returns version string when known.
+    """
+    try:
+        import yt_dlp  # noqa: F401  # type: ignore
+    except Exception as exc:
+        raise DependencyError("yt-dlp Python package is required. Install with: pip install -U yt-dlp") from exc
+    return get_yt_dlp_version() or "unknown"
+
+
+def _resolve_tool_paths(tool_hint: Optional[str], exe_name: str) -> Tuple[Optional[str], Optional[str]]:
+    """
+    Returns (resolved_exe_path, resolved_dir_hint).
+    - If tool_hint is a file path, use it.
+    - If tool_hint is a directory, append exe_name.
+    - Otherwise, treat tool_hint as a command and fall back to PATH resolution.
+    """
+    if tool_hint:
+        hint_str = str(tool_hint).strip().strip('"').strip("'")
+        hint = Path(hint_str)
+        # Expand envvars (%FFMPEG%) etc.
+        expanded = Path(os.path.expandvars(str(hint)))
+        if expanded.is_dir():
+            cand = expanded / exe_name
+            if cand.exists():
+                return str(cand), str(expanded)
+        if expanded.exists():
+            return str(expanded), str(expanded.parent)
+
+    # PATH lookup
+    found = which(exe_name)
+    if found:
+        return found, str(Path(found).parent)
+    return None, None
+
+
+def ensure_ffmpeg_available(ffmpeg_hint: Optional[str]) -> Tuple[str, str]:
+    """
+    Ensures ffmpeg is runnable. Returns (ffmpeg_path, ffmpeg_path).
+
+    Note: ffprobe is intentionally not required. This project uses ffmpeg directly for
+    audio extraction, and yt-dlp can still function for muxed downloads without ffprobe.
+    """
+    ffmpeg_exe = "ffmpeg.exe" if sys.platform.startswith("win") else "ffmpeg"
+
+    ffmpeg_path, ffmpeg_dir = _resolve_tool_paths(ffmpeg_hint, ffmpeg_exe)
+    if not ffmpeg_path:
+        raise DependencyError("ffmpeg not found. Install ffmpeg or set 'ffmpeg_path' in config.")
+
+    # Smoke test (fast)
+    try:
+        subprocess.run([ffmpeg_path, "-version"], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+    except Exception as exc:
+        raise DependencyError("ffmpeg exists but is not runnable. Check permissions/architecture/path.") from exc
+
+    # Keep return shape stable for existing callers
+    return ffmpeg_path, ffmpeg_path

src/app/core/utils/logging_setup.py

@@ -0,0 +1,37 @@
+from __future__ import annotations
+
+import logging
+from logging.handlers import RotatingFileHandler
+from pathlib import Path
+
+
+def configure_logging(*, verbose: bool = False, log_file: Path | None = None) -> None:
+    """
+    Configure app-wide logging.
+
+    - Console handler always enabled.
+    - Rotating file handler enabled when log_file is provided.
+    """
+    root = logging.getLogger()
+    root.setLevel(logging.DEBUG if verbose else logging.INFO)
+
+    # Avoid duplicate handlers on repeated calls (tests, re-entrypoints).
+    if getattr(configure_logging, "_configured", False):
+        return
+
+    fmt = logging.Formatter("%(asctime)s %(levelname)s %(name)s: %(message)s")
+
+    console = logging.StreamHandler()
+    console.setLevel(logging.DEBUG if verbose else logging.INFO)
+    console.setFormatter(fmt)
+    root.addHandler(console)
+
+    if log_file is not None:
+        log_file.parent.mkdir(parents=True, exist_ok=True)
+        file_handler = RotatingFileHandler(str(log_file), maxBytes=2_000_000, backupCount=3, encoding="utf-8")
+        file_handler.setLevel(logging.DEBUG)
+        file_handler.setFormatter(fmt)
+        root.addHandler(file_handler)
+
+    configure_logging._configured = True  # type: ignore[attr-defined]
+

src/app/core/utils/naming.py

@@ -0,0 +1,13 @@
+from __future__ import annotations
+
+ILLEGAL_CHARS = '<>:"/\\|?*'
+
+
+def sanitize_title(title: str, fallback: str) -> str:
+    table = str.maketrans({c: "-" for c in ILLEGAL_CHARS})
+    safe = (title or "").translate(table).strip()
+    return safe if safe else fallback
+
+
+def make_filename(index: int, title: str, ext: str, width: int = 4) -> str:
+    return f"{index:0{width}d} - {title}{ext}"

src/app/core/utils/rate_limit.py

@@ -0,0 +1,23 @@
+from __future__ import annotations
+
+
+def is_youtube_rate_limit_error(message: str | None) -> bool:
+    """
+    Best-effort detection of YouTube "bot check" / auth-gated extraction failures.
+
+    yt-dlp typically surfaces this as:
+      - "Sign in to confirm you’re not a bot"
+      - mentions of --cookies / --cookies-from-browser
+    """
+    if not message:
+        return False
+    s = str(message).lower()
+    needles = [
+        "sign in to confirm",
+        "you're not a bot",
+        "you’re not a bot",
+        "--cookies-from-browser",
+        "--cookies",
+    ]
+    return any(n in s for n in needles)
+

src/app/core/utils/version.py

@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+
+def _resource_base() -> Path:
+    # PyInstaller sets sys._MEIPASS to the temp extraction dir.
+    base = getattr(sys, "_MEIPASS", None)
+    if base:
+        return Path(str(base))
+    return Path.cwd()
+
+
+def _read_text(path: Path) -> str | None:
+    try:
+        if path.exists():
+            text = path.read_text(encoding="utf-8").strip()
+            return text or None
+    except Exception:
+        pass
+    return None
+def get_app_version() -> str:
+    """
+    Returns the packaged app version.
+
+    In release builds this reads from `version.txt` bundled into the EXE.
+    """
+    candidates = [
+        Path("version.txt"),
+        _resource_base() / "version.txt",
+    ]
+    for candidate in candidates:
+        text = _read_text(candidate)
+        if text:
+            return text
+
+    return "dev"

src/app/core/utils/yt.py

@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+from urllib.parse import parse_qs, urlparse
+
+
+def extract_playlist_id(url: str) -> str | None:
+    try:
+        parsed = urlparse(url)
+        qs = parse_qs(parsed.query)
+        if "list" in qs and qs.get("list"):
+            return qs.get("list", [None])[0]
+        return None
+    except Exception:
+        return None

src/app/gui/__init__.py

@@ -0,0 +1,2 @@
+from __future__ import annotations
+

src/app/gui/app_icon.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+from PySide6 import QtGui, QtWidgets
+
+
+def _resource_base() -> Path:
+    # PyInstaller sets sys._MEIPASS to the temp extraction dir.
+    base = getattr(sys, "_MEIPASS", None)
+    if base:
+        return Path(str(base))
+    return Path.cwd()
+
+
+def load_app_icon() -> QtGui.QIcon:
+    """
+    Best-effort app icon loader.
+
+    Looks for `assets/icon.png` in the current working directory (dev),
+    or in the PyInstaller bundle root (packaged).
+    """
+    candidates = [
+        Path("assets/icon.png"),
+        _resource_base() / "assets" / "icon.png",
+    ]
+    for p in candidates:
+        try:
+            if p.exists():
+                icon = QtGui.QIcon(str(p))
+                if not icon.isNull():
+                    return icon
+        except Exception:
+            pass
+
+    # Fallback to a platform theme icon (Linux) or a generic icon.
+    try:
+        themed = QtGui.QIcon.fromTheme("applications-multimedia")
+        if not themed.isNull():
+            return themed
+    except Exception:
+        pass
+
+    return QtWidgets.QApplication.style().standardIcon(QtWidgets.QStyle.StandardPixmap.SP_ComputerIcon)
+

src/app/gui/bus_bridge.py

@@ -0,0 +1,40 @@
+from __future__ import annotations
+from typing import Any, Dict
+from PySide6 import QtCore
+
+from ..core.events.event_bus import EventBus
+
+
+class BusBridge(QtCore.QObject):
+    """
+    Bridges backend EventBus async events onto the Qt main thread.
+
+    Emits `event(name, payload)` as a Qt signal, thread-safe.
+    """
+
+    event = QtCore.Signal(str, dict)
+
+    def __init__(self, bus: EventBus, parent: QtCore.QObject | None = None) -> None:
+        super().__init__(parent)
+        self._bus = bus
+
+        for name in (
+            "SyncStarted",
+            "SyncSummary",
+            "SyncFinished",
+            "DownloadStarted",
+            "DownloadProgress",
+            "DownloadCompleted",
+            "DownloadFailed",
+            "RenameApplied",
+            "FileRecycled",
+        ):
+            self._bus.subscribe(name, self._make_handler(name))
+
+    def _make_handler(self, name: str):
+        async def handler(payload: Dict[str, Any]) -> None:
+            # Ensure delivery on the Qt main thread.
+            self.event.emit(name, dict(payload))
+
+        return handler
+

src/app/gui/config_store.py

@@ -0,0 +1,37 @@
+from __future__ import annotations
+
+import json
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Any, Dict
+
+
+@dataclass(frozen=True)
+class AppConfig:
+    data: Dict[str, Any]
+    path: Path
+
+
+def load_config(path: Path) -> AppConfig:
+    raw = json.loads(path.read_text(encoding="utf-8"))
+    if not isinstance(raw, dict):
+        raise ValueError("config root must be a JSON object")
+    return AppConfig(data=raw, path=path)
+
+
+def save_config(path: Path, data: Dict[str, Any]) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    payload = json.dumps(data, indent=2, ensure_ascii=False) + "\n"
+    path.write_text(payload, encoding="utf-8")
+
+
+def normalize_config(data: Dict[str, Any]) -> Dict[str, Any]:
+    """
+    Ensure basic expected shape for config dict.
+    Keeps unknown keys intact.
+    """
+    out = dict(data)
+    pls = out.get("playlists")
+    if not isinstance(pls, list):
+        out["playlists"] = []
+    return out

src/app/gui/main.py

@@ -0,0 +1,500 @@
+from __future__ import annotations
+
+import sys
+import threading
+
+from PySide6 import QtCore, QtGui, QtWidgets
+
+from ..config.settings import Settings
+from ..core.events.event_bus import EventBus
+from .bus_bridge import BusBridge
+from .app_icon import load_app_icon
+from .config_store import load_config
+from .runner import SyncRequest, SyncRunner
+from .pages.playlists import PlaylistManagerPage
+from .pages.queue import QueuePage
+from .pages.logs import LogsPage
+from .pages.settings import SettingsPage
+from .pages.about import AboutPage
+
+
+class MainWindow(QtWidgets.QMainWindow):
+    def __init__(self) -> None:
+        super().__init__()
+        self.setWindowTitle("ytpl-sync")
+        self.resize(1100, 700)
+        self.setWindowIcon(load_app_icon())
+
+        self._settings = Settings()
+        self._bus = EventBus()
+        self._bridge = BusBridge(self._bus)
+
+        self._thread: QtCore.QThread | None = None
+        self._runner: SyncRunner | None = None
+        self._cancel_flag: threading.Event | None = None
+        self._pause_flag: threading.Event | None = None
+        self._tray: QtWidgets.QSystemTrayIcon | None = None
+        self._tray_notified = False
+
+        # Sidebar navigation
+        self._nav = QtWidgets.QListWidget()
+        self._nav.setObjectName("sidebar")
+        self._nav.setSpacing(2)
+        self._nav.setHorizontalScrollBarPolicy(
+            QtCore.Qt.ScrollBarPolicy.ScrollBarAlwaysOff
+        )
+        self._nav.setVerticalScrollBarPolicy(
+            QtCore.Qt.ScrollBarPolicy.ScrollBarAsNeeded
+        )
+        self._nav.setSelectionMode(QtWidgets.QAbstractItemView.SelectionMode.SingleSelection)
+        self._nav.model().rowsInserted.connect(self._update_sidebar_width)
+        self._nav.model().dataChanged.connect(self._update_sidebar_width)
+        self._nav.model().rowsRemoved.connect(self._update_sidebar_width)
+
+        self._stack = QtWidgets.QStackedWidget()
+        self._playlists_page = PlaylistManagerPage(self._settings)
+        self._queue_page = QueuePage()
+        self._logs_page = LogsPage()
+        self._settings_page = SettingsPage()
+        self._about_page = AboutPage()
+
+        self._pages: list[QtWidgets.QWidget] = [
+            self._playlists_page,
+            self._queue_page,
+            self._logs_page,
+            self._settings_page,
+            self._about_page,
+        ]
+        for p in self._pages:
+            self._stack.addWidget(p)
+
+        for label in ("Playlists", "Queue", "Logs", "Settings", "About"):
+            self._add_sidebar_item(label)
+
+        self._nav.currentRowChanged.connect(self._stack.setCurrentIndex)
+        self._nav.setCurrentRow(0)
+
+        # Layout
+        root = QtWidgets.QWidget()
+        layout = QtWidgets.QHBoxLayout(root)
+        layout.setContentsMargins(0, 0, 0, 0)
+        layout.addWidget(self._nav)
+        layout.addWidget(self._stack, 1)
+        self.setCentralWidget(root)
+
+        self._bridge.event.connect(self._on_bus_event)
+        self._apply_style()
+
+        # Provide Settings page a concrete config path.
+        cfg_path = getattr(self._settings, "path", None)
+        if cfg_path is not None:
+            try:
+                self._settings_page.set_config_path(cfg_path)
+            except Exception:
+                pass
+
+        self._playlists_page.cancel_requested.connect(self._cancel_sync)
+        self._queue_page.cancel_sync_requested.connect(self._cancel_sync)
+        self._playlists_page.sync_one_requested.connect(self._sync_playlist_index)
+        self._playlists_page.sync_all_requested.connect(self._sync_all)
+        self._playlists_page.pause_requested.connect(self._pause_sync)
+        self._playlists_page.resume_requested.connect(self._resume_sync)
+
+        self._refresh_queue_labels()
+        self._init_tray()
+        QtCore.QTimer.singleShot(0, self._update_sidebar_width)
+
+    def _add_sidebar_item(self, label: str) -> None:
+        item = QtWidgets.QListWidgetItem(label)
+        self._nav.addItem(item)
+        self._update_sidebar_width()
+
+    def _update_sidebar_width(self, *_args: object) -> None:
+        metrics = self._nav.fontMetrics()
+        max_text_width = 0
+        for row in range(self._nav.count()):
+            item = self._nav.item(row)
+            if item is None:
+                continue
+            max_text_width = max(max_text_width, metrics.horizontalAdvance(item.text()))
+
+        if max_text_width <= 0:
+            return
+
+        frame = self._nav.frameWidth() * 2
+        padding = 44
+        target_width = max_text_width + frame + padding
+        self._nav.setFixedWidth(max(120, min(220, target_width)))
+
+    def _tray_config(self) -> dict:
+        # Read from disk so toggles apply immediately (no restart required).
+        try:
+            cfg_path = getattr(self._settings, "path", None)
+            if cfg_path is None:
+                return {}
+            raw = load_config(cfg_path).data
+            ui = raw.get("ui")
+            ui = ui if isinstance(ui, dict) else {}
+            tray = ui.get("tray")
+            tray = tray if isinstance(tray, dict) else {}
+            return dict(tray)
+        except Exception:
+            return {}
+
+    def _close_to_tray_enabled(self) -> bool:
+        return bool(self._tray_config().get("close_to_tray", False))
+
+    def _minimize_to_tray_enabled(self) -> bool:
+        return bool(self._tray_config().get("minimize_to_tray", False))
+
+    def _start_minimized_to_tray_enabled(self) -> bool:
+        return bool(self._tray_config().get("start_minimized_to_tray", False))
+
+    def should_start_minimized_to_tray(self) -> bool:
+        return self._tray is not None and self._start_minimized_to_tray_enabled()
+
+    def _init_tray(self) -> None:
+        # Tray support is optional and platform-dependent (e.g., some Linux DEs).
+        try:
+            if not QtWidgets.QSystemTrayIcon.isSystemTrayAvailable():
+                return
+        except Exception:
+            return
+
+        icon = load_app_icon()
+        tray = QtWidgets.QSystemTrayIcon(icon, self)
+        tray.setToolTip("ytpl-sync")
+
+        menu = QtWidgets.QMenu()
+        act_toggle = menu.addAction("Show/Hide")
+        act_quit = menu.addAction("Quit")
+        tray.setContextMenu(menu)
+
+        act_toggle.triggered.connect(self._toggle_visible)
+        act_quit.triggered.connect(self._quit_from_tray)
+        tray.activated.connect(self._on_tray_activated)
+
+        tray.show()
+        self._tray = tray
+
+    def _toggle_visible(self) -> None:
+        if self.isVisible():
+            self.hide()
+        else:
+            self.show()
+            self.raise_()
+            self.activateWindow()
+
+    def _quit_from_tray(self) -> None:
+        # Ensure the closeEvent doesn't just hide the window.
+        self._tray = None
+        QtWidgets.QApplication.quit()
+
+    def _on_tray_activated(self, reason: QtWidgets.QSystemTrayIcon.ActivationReason) -> None:
+        if reason in (
+            QtWidgets.QSystemTrayIcon.ActivationReason.Trigger,
+            QtWidgets.QSystemTrayIcon.ActivationReason.DoubleClick,
+        ):
+            self._toggle_visible()
+
+    def closeEvent(self, event: QtGui.QCloseEvent) -> None:  # type: ignore[override]
+        # If tray is active and configured, close-to-tray.
+        if self._tray is not None and self._close_to_tray_enabled():
+            event.ignore()
+            self.hide()
+            if not self._tray_notified:
+                self._tray_notified = True
+                try:
+                    self._tray.showMessage(
+                        "ytpl-sync",
+                        "Still running in the tray. Use the tray icon menu to quit.",
+                        QtWidgets.QSystemTrayIcon.MessageIcon.Information,
+                        3000,
+                    )
+                except Exception:
+                    pass
+            return
+        if self._tray is not None and not self._close_to_tray_enabled():
+            # Explicitly quit, because the app may be configured to keep running without windows.
+            try:
+                event.accept()
+            except Exception:
+                pass
+            QtWidgets.QApplication.quit()
+            return
+        super().closeEvent(event)
+
+    def changeEvent(self, event: QtCore.QEvent) -> None:  # type: ignore[override]
+        try:
+            if event.type() == QtCore.QEvent.Type.WindowStateChange:
+                if self._tray is not None and self._minimize_to_tray_enabled():
+                    if bool(self.windowState() & QtCore.Qt.WindowState.WindowMinimized):
+                        QtCore.QTimer.singleShot(0, self.hide)
+        except Exception:
+            pass
+        super().changeEvent(event)
+
+    def _refresh_queue_labels(self) -> None:
+        try:
+            from ..core.utils.yt import extract_playlist_id
+
+            labels: dict[str, str] = {}
+            for idx, pl in enumerate(self._settings.playlists, start=1):
+                url = str(pl.get("url") or "")
+                pid = extract_playlist_id(url) or url
+                labels[pid] = str(pl.get("name") or f"Playlist {idx}")
+            self._queue_page.set_playlist_labels(labels)
+        except Exception:
+            pass
+
+    @QtCore.Slot(str, dict)
+    def _on_bus_event(self, name: str, payload: dict) -> None:
+        # Fan out to interested pages.
+        try:
+            self._queue_page.on_event(name, payload)
+        except Exception:
+            pass
+        try:
+            self._logs_page.on_event(name, payload)
+        except Exception:
+            pass
+        try:
+            self._playlists_page.on_event(name, payload)
+        except Exception:
+            pass
+
+        # Auto-pause on YouTube bot-check/rate-limit surface.
+        if name == "SyncPaused":
+            self._pause_sync()
+
+    def _sync_playlist_index(self, index: int) -> None:
+        playlists = self._settings.playlists
+        if index < 0 or index >= len(playlists):
+            return
+        cfg = dict(playlists[index])
+        self._refresh_queue_labels()
+        self._playlists_page.set_running(True)
+
+        # Stop any previous run
+        if self._thread is not None:
+            self._thread.quit()
+            self._thread.wait(2000)
+            self._thread = None
+            self._runner = None
+            self._cancel_flag = None
+
+        self._thread = QtCore.QThread()
+        self._cancel_flag = threading.Event()
+        self._pause_flag = threading.Event()
+        self._runner = SyncRunner(self._bus)
+        self._runner.moveToThread(self._thread)
+        self._runner.set_request(SyncRequest(playlist_cfg=cfg, apply=True, cancel_flag=self._cancel_flag, pause_flag=self._pause_flag))
+        self._thread.started.connect(self._runner.run_current)
+        self._runner.finished.connect(self._on_sync_finished)
+        self._runner.finished.connect(self._thread.quit)
+        self._thread.start()
+
+    def _sync_all(self) -> None:
+        # Run playlists sequentially (simple + predictable).
+        if self._thread is not None:
+            return
+        self._sync_queue = list(range(len(self._settings.playlists)))
+        if not self._sync_queue:
+            return
+        self._playlists_page.set_running(True)
+        self._sync_playlist_index(self._sync_queue.pop(0))
+
+    @QtCore.Slot(bool, str)
+    def _on_sync_finished(self, ok: bool, message: str) -> None:
+        if not ok:
+            self._logs_page.on_event("SyncError", {"error": message})
+        self._playlists_page.set_running(False)
+
+        # Mark idle so "Sync all" can be started again.
+        if self._thread is not None:
+            try:
+                self._thread.quit()
+                self._thread.wait(2000)
+            except Exception:
+                pass
+        self._runner = None
+        self._cancel_flag = None
+        self._pause_flag = None
+        self._thread = None
+
+        # Reload config in case playlists/settings changed externally during run.
+        try:
+            self._settings = Settings()
+            self._playlists_page.reload_from_config()
+            cfg_path = getattr(self._settings, "path", None)
+            if cfg_path is not None:
+                self._settings_page.set_config_path(cfg_path)
+            self._refresh_queue_labels()
+        except Exception:
+            pass
+
+        # Continue "sync all" chain if active.
+        if hasattr(self, "_sync_queue") and getattr(self, "_sync_queue"):
+            nxt = getattr(self, "_sync_queue").pop(0)
+            self._sync_playlist_index(nxt)
+
+    @QtCore.Slot()
+    def _cancel_sync(self) -> None:
+        if self._cancel_flag is not None:
+            self._cancel_flag.set()
+        if self._pause_flag is not None:
+            self._pause_flag.clear()
+
+    def _pause_sync(self) -> None:
+        if self._pause_flag is not None:
+            self._pause_flag.set()
+
+    def _resume_sync(self) -> None:
+        if self._pause_flag is not None:
+            self._pause_flag.clear()
+
+    def _apply_style(self) -> None:
+        self.setStyleSheet(
+            """
+            QMainWindow { background: #0f1218; color: #d7dce4; }
+            QWidget { font-size: 13px; color: #d7dce4; }
+            QWidget#playlistsPage,
+            QWidget#queuePage,
+            QWidget#logsPage,
+            QWidget#settingsPage,
+            QWidget#aboutPage {
+              background: #0f1218;
+            }
+            QLabel#pageTitle { font-size: 18px; font-weight: 600; padding: 4px 0; }
+            QLabel#cardTitle { font-size: 15px; font-weight: 600; color: #eef2f8; }
+            QLabel[muted="true"] { color: #9aa3b2; }
+            QLabel[link="true"] { color: #6c8bff; }
+            QLabel[link="true"]:hover { color: #8ea7ff; }
+
+            QListWidget#sidebar {
+              background: #0d1015;
+              border-right: 1px solid #2a3140;
+              padding: 8px;
+            }
+            QListWidget#sidebar::item {
+              color: #cfd3da;
+              border-radius: 8px;
+              padding: 8px 10px;
+            }
+            QListWidget#sidebar::item:selected {
+              background: #21304a;
+              color: #ffffff;
+            }
+
+            QTableWidget {
+                background: #171b22;
+                gridline-color: #2a3140;
+                border: 1px solid #2a3140;
+            }
+            QTableWidget::item {
+              padding: 6px 8px;
+            }
+            QPlainTextEdit {
+              background: #11151c;
+              border: 1px solid #2a3140;
+              border-radius: 10px;
+              color: #d7dce4;
+            }
+            QScrollBar:vertical {
+              background: #0f1218;
+              width: 12px;
+              margin: 0px;
+            }
+            QScrollBar::handle:vertical {
+              background: #34465f;
+              min-height: 24px;
+              border-radius: 6px;
+            }
+            QScrollBar::handle:vertical:hover {
+              background: #456183;
+            }
+            QScrollBar::add-line:vertical,
+            QScrollBar::sub-line:vertical,
+            QScrollBar::add-page:vertical,
+            QScrollBar::sub-page:vertical {
+              background: transparent;
+              border: none;
+            }
+            QGroupBox {
+              border: 1px solid #2a3140;
+              border-radius: 12px;
+              margin-top: 14px;
+              padding: 12px;
+              background: #171b22;
+            }
+            QGroupBox::title {
+              subcontrol-origin: margin;
+              left: 12px;
+              padding: 0 6px;
+              color: #e2e7ef;
+              background: #171b22;
+            }
+            QFrame#aboutCard {
+              background: #171b22;
+              border: 1px solid #2a3140;
+              border-radius: 14px;
+            }
+            QHeaderView::section {
+              background: #171b22;
+              color: #d7dce4;
+              border: 1px solid #2a3140;
+              padding: 6px;
+            }
+            QPushButton {
+              background: #1e2631;
+              border: 1px solid #31405a;
+              padding: 6px 10px;
+              border-radius: 8px;
+              color: #d7dce4;
+            }
+            QPushButton:hover { background: #26344a; }
+            QPushButton:pressed { background: #1a2433; }
+
+            QFrame#playlistCard {
+              background: #171b22;
+              border: 1px solid #2a3140;
+              border-radius: 12px;
+              padding: 10px;
+            }
+            QLineEdit, QComboBox {
+              background: #11151c;
+              border: 1px solid #2a3140;
+              border-radius: 8px;
+              padding: 6px 8px;
+              color: #d7dce4;
+            }
+            QLineEdit:focus, QComboBox:focus {
+              border: 1px solid #6c8bff;
+            }
+            """
+        )
+
+
+def main() -> int:
+    app = QtWidgets.QApplication(sys.argv)
+    app.setApplicationName("ytpl-sync")
+    app.setOrganizationName("ytpl-sync")
+    app.setWindowIcon(load_app_icon())
+    app.setQuitOnLastWindowClosed(False)
+
+    # Avoid Qt warnings when a font with invalid point size is inherited from the environment.
+    f = app.font()
+    if f.pointSize() <= 0:
+        f.setPointSize(10)
+        app.setFont(f)
+
+    w = MainWindow()
+    if w.should_start_minimized_to_tray():
+        w.hide()
+    else:
+        w.show()
+    return app.exec()
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

src/app/gui/pages/__init__.py

@@ -0,0 +1,2 @@
+from __future__ import annotations
+

src/app/gui/pages/about.py

@@ -0,0 +1,112 @@
+from __future__ import annotations
+
+from PySide6 import QtCore, QtGui, QtWidgets
+
+from ...core.utils.version import get_app_version
+
+
+class AboutPage(QtWidgets.QWidget):
+    REPO_URL = "https://github.com/darkzoul5/YoutubePlaylistSync"
+    ISSUES_URL = f"{REPO_URL}/issues"
+
+    def __init__(self, parent: QtWidgets.QWidget | None = None) -> None:
+        super().__init__(parent)
+        self.setObjectName("aboutPage")
+
+        layout = QtWidgets.QVBoxLayout(self)
+        layout.setContentsMargins(16, 16, 16, 16)
+        layout.setSpacing(14)
+
+        title = QtWidgets.QLabel("About")
+        title.setObjectName("pageTitle")
+        layout.addWidget(title)
+
+        for card in (
+            self._hero_card(),
+            self._project_card(),
+            self._suggestions_card(),
+        ):
+            layout.addWidget(card)
+        layout.addStretch(1)
+
+    def _card(self, title: str) -> tuple[QtWidgets.QFrame, QtWidgets.QVBoxLayout]:
+        card = QtWidgets.QFrame()
+        card.setObjectName("aboutCard")
+
+        layout = QtWidgets.QVBoxLayout(card)
+        layout.setContentsMargins(16, 16, 16, 16)
+        layout.setSpacing(10)
+        layout.addWidget(self._card_title(title))
+        return card, layout
+
+    def _card_title(self, text: str) -> QtWidgets.QLabel:
+        label = QtWidgets.QLabel(text)
+        label.setObjectName("cardTitle")
+        return label
+
+    def _muted_label(self, text: str) -> QtWidgets.QLabel:
+        label = QtWidgets.QLabel(text)
+        label.setWordWrap(True)
+        label.setProperty("muted", True)
+        return label
+
+    def _link_button(self, text: str, url: str) -> QtWidgets.QPushButton:
+        button = QtWidgets.QPushButton(text)
+        button.setCursor(QtCore.Qt.CursorShape.PointingHandCursor)
+        button.clicked.connect(lambda: QtGui.QDesktopServices.openUrl(QtCore.QUrl(url)))
+        return button
+
+    def _action_row(self, text: str, url: str) -> QtWidgets.QWidget:
+        row = QtWidgets.QWidget()
+        layout = QtWidgets.QHBoxLayout(row)
+        layout.setContentsMargins(0, 0, 0, 0)
+        layout.setSpacing(10)
+        layout.addWidget(self._link_button(text, url))
+        layout.addStretch(1)
+        return row
+
+    def _hero_card(self) -> QtWidgets.QFrame:
+        card, layout = self._card("About this project")
+        layout.insertWidget(
+            1,
+            self._muted_label(
+                "ytpl-sync is a desktop app for keeping local copies of YouTube playlists in sync."
+            ),
+        )
+        layout.insertWidget(2, self._muted_label("This is a student project."))
+        return card
+
+    def _project_card(self) -> QtWidgets.QFrame:
+        card, layout = self._card("Project")
+
+        form = QtWidgets.QFormLayout()
+        form.setLabelAlignment(QtCore.Qt.AlignmentFlag.AlignLeft)
+        form.setFormAlignment(
+            QtCore.Qt.AlignmentFlag.AlignTop | QtCore.Qt.AlignmentFlag.AlignLeft
+        )
+        form.setHorizontalSpacing(14)
+        form.setVerticalSpacing(10)
+
+        version_text = get_app_version()
+        version = f"v{version_text}" if version_text != "dev" else version_text
+        rows = [
+            ("Author", self._muted_label("Dark_Zoul")),
+            ("Version", self._muted_label(version)),
+            ("Repository", self._action_row("Open", self.REPO_URL)),
+            ("Issues", self._action_row("Open", self.ISSUES_URL)),
+        ]
+        for label, widget in rows:
+            form.addRow(label, widget)
+
+        layout.addLayout(form)
+        return card
+
+    def _suggestions_card(self) -> QtWidgets.QFrame:
+        card, layout = self._card("Suggestions")
+        layout.addWidget(
+            self._muted_label(
+                "• Keep the app updated regularly so that YouTube extraction stays reliable."
+            )
+        )
+        layout.addStretch(1)
+        return card

src/app/gui/pages/logs.py

@@ -0,0 +1,44 @@
+from __future__ import annotations
+
+import json
+
+from PySide6 import QtWidgets
+
+from ..smooth_scroll import enable_smooth_scrolling
+
+
+class LogsPage(QtWidgets.QWidget):
+    def __init__(self, parent: QtWidgets.QWidget | None = None) -> None:
+        super().__init__(parent)
+        self.setObjectName("logsPage")
+        layout = QtWidgets.QVBoxLayout(self)
+        title = QtWidgets.QLabel("Logs")
+        title.setObjectName("pageTitle")
+
+        top = QtWidgets.QHBoxLayout()
+        top.addWidget(title)
+        top.addStretch(1)
+        clear_btn = QtWidgets.QPushButton("Clear")
+        clear_btn.clicked.connect(self._clear)
+        top.addWidget(clear_btn)
+        layout.addLayout(top)
+
+        self._text = QtWidgets.QPlainTextEdit()
+        self._text.setReadOnly(True)
+        enable_smooth_scrolling(self._text)
+        layout.addWidget(self._text, 1)
+
+    def _clear(self) -> None:
+        self._text.clear()
+
+    def on_event(self, name: str, payload: dict) -> None:
+        # Avoid flooding the UI with high-frequency progress updates.
+        if name == "DownloadProgress":
+            return
+        # Keep this lightweight: append a single-line JSON entry.
+        try:
+            line = json.dumps({"event": name, **payload}, ensure_ascii=False)
+        except Exception:
+            line = f"{name}: {payload}"
+        self._text.appendPlainText(line)
+        self._text.moveCursor(self._text.textCursor().End)

src/app/gui/pages/playlists.py

@@ -0,0 +1,650 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Any
+from pathlib import Path
+
+from PySide6 import QtCore, QtGui, QtWidgets
+
+from ...config.settings import Settings
+from ...core.database.db import Database
+from ...core.utils.yt import extract_playlist_id
+from ..smooth_scroll import enable_smooth_scrolling
+from ..config_store import load_config, normalize_config, save_config
+
+
+@dataclass(frozen=True)
+class PlaylistRow:
+    name: str
+    url: str
+    download_mode: str
+    max_download_quality: str
+    save_path: str
+
+
+class PlaylistManagerPage(QtWidgets.QWidget):
+    cancel_requested = QtCore.Signal()
+    sync_one_requested = QtCore.Signal(int)
+    sync_all_requested = QtCore.Signal()
+    pause_requested = QtCore.Signal()
+    resume_requested = QtCore.Signal()
+
+    def __init__(
+        self,
+        settings: Settings,
+        *,
+        parent: QtWidgets.QWidget | None = None,
+    ) -> None:
+        super().__init__(parent)
+        self.setObjectName("playlistsPage")
+        self._settings = settings
+        self._config_path = getattr(settings, "path", None)
+        self._config: dict[str, Any] = {}
+        self._download_state_by_pid: dict[str, dict[str, Any]] = {}
+        self._suppress_autosave = False
+        self._autosave_timer = QtCore.QTimer(self)
+        self._autosave_timer.setSingleShot(True)
+        self._autosave_timer.setInterval(600)
+        self._autosave_timer.timeout.connect(self._autosave_now)
+
+        header = QtWidgets.QLabel("Playlists")
+        header.setObjectName("pageTitle")
+
+        self._list = QtWidgets.QListWidget()
+        self._list.setObjectName("playlistList")
+        # Selection-based UI is intentionally disabled; actions happen per-card.
+        self._list.setSelectionMode(QtWidgets.QAbstractItemView.SelectionMode.NoSelection)
+        self._list.setSpacing(8)
+        self._list.setUniformItemSizes(False)
+        self._list.setWordWrap(True)
+        self._list.setVerticalScrollMode(QtWidgets.QAbstractItemView.ScrollMode.ScrollPerPixel)
+        enable_smooth_scrolling(self._list)
+        self._list.setStyleSheet(
+            """
+            QListWidget#playlistList {
+              background: #0f1218;
+              border: none;
+            }
+            QListWidget#playlistList::viewport {
+              background: #0f1218;
+            }
+            QListWidget#playlistList::item {
+              background: transparent;
+            }
+            """
+        )
+
+        self._add_btn = QtWidgets.QPushButton("Add")
+        self._add_btn.clicked.connect(self._add_playlist)
+        self._save_btn = QtWidgets.QPushButton("Save config")
+        self._save_btn.clicked.connect(self._save_config)
+
+        self._sync_all_btn = QtWidgets.QPushButton("Sync all")
+        self._sync_all_btn.clicked.connect(self.sync_all_requested.emit)
+
+        self._cancel_btn = QtWidgets.QPushButton("Cancel all")
+        self._cancel_btn.setEnabled(False)
+        self._cancel_btn.clicked.connect(self._cancel_sync)
+
+        self._refresh_btn = QtWidgets.QPushButton("Reload config")
+        self._refresh_btn.clicked.connect(self.reload_from_config)
+
+        self._status = QtWidgets.QLabel("")
+        self._status.setWordWrap(True)
+        self._sync_state = QtWidgets.QLabel("")
+        self._sync_state.setWordWrap(True)
+        self._sync_state.setStyleSheet("color: #9fb0c6;")
+
+        top = QtWidgets.QHBoxLayout()
+        top.addWidget(header)
+        top.addStretch(1)
+        top.addWidget(self._add_btn)
+        top.addWidget(self._save_btn)
+        top.addWidget(self._sync_all_btn)
+        top.addWidget(self._cancel_btn)
+        top.addWidget(self._refresh_btn)
+
+        layout = QtWidgets.QVBoxLayout(self)
+        layout.addLayout(top)
+        layout.addWidget(self._list, 1)
+        layout.addWidget(self._sync_state)
+        layout.addWidget(self._status)
+
+        self.reload_from_config()
+
+    def _rows_from_settings(self) -> list[PlaylistRow]:
+        rows: list[PlaylistRow] = []
+        for idx, pl in enumerate(self._settings.playlists, start=1):
+            name = str(pl.get("name") or f"Playlist {idx}")
+            rows.append(
+                PlaylistRow(
+                    name=name,
+                    url=str(pl.get("url") or ""),
+                    download_mode=str(pl.get("download_mode") or ""),
+                    max_download_quality=str(pl.get("max_download_quality") or ""),
+                    save_path=str(pl.get("save_path") or ""),
+                )
+            )
+        return rows
+
+    @QtCore.Slot()
+    def reload_from_config(self) -> None:
+        try:
+            self._suppress_autosave = True
+            self._settings = Settings()
+            self._config_path = getattr(self._settings, "path", None)
+            if self._config_path is None:
+                raise RuntimeError("Config path not available")
+            self._config = normalize_config(load_config(self._config_path).data)
+            rows = self._rows_from_settings()
+        except Exception as exc:
+            self._status.setText(f"Failed to load config: {exc}")
+            return
+        finally:
+            self._suppress_autosave = False
+
+        # Optional DB metadata (last_sync). If DB is missing/corrupt, keep UI usable.
+        last_sync_by_id: dict[str, str] = {}
+        try:
+            db = Database(Path("db/app.db").resolve())
+            for r in rows:
+                pid = extract_playlist_id(r.url) or r.url
+                ls = db.get_playlist_last_sync(pid)
+                if ls:
+                    last_sync_by_id[pid] = str(ls)
+        except Exception:
+            last_sync_by_id = {}
+
+        self._list.clear()
+        for idx, r in enumerate(rows):
+            pid = extract_playlist_id(r.url) or r.url
+            widget = _PlaylistCard(r, index=idx, last_sync=last_sync_by_id.get(pid))
+            widget.sync_clicked.connect(self.sync_one_requested.emit)
+            widget.remove_clicked.connect(self._remove_at_index)
+            widget.cancel_clicked.connect(lambda _pid: self._cancel_sync())
+            widget.pause_changed.connect(self._on_pause_changed)
+            widget.changed.connect(self._schedule_autosave)
+            item = QtWidgets.QListWidgetItem()
+            item.setSizeHint(widget.sizeHint())
+            self._list.addItem(item)
+            self._list.setItemWidget(item, widget)
+
+        cfg_path = getattr(self._settings, "path", None)
+        self._status.setText(f"Loaded {len(rows)} playlists from {cfg_path}.")
+
+    @QtCore.Slot()
+    def _cancel_sync(self) -> None:
+        # Actual cancellation is handled by MainWindow; this is UI intent.
+        self._status.setText("Cancelling…")
+        self.cancel_requested.emit()
+
+    def set_running(self, running: bool) -> None:
+        self._sync_all_btn.setEnabled(not running)
+        self._cancel_btn.setEnabled(running)
+        self._save_btn.setEnabled(not running)
+        self._add_btn.setEnabled(not running)
+        self._refresh_btn.setEnabled(not running)
+        # Keep the list enabled so per-card Pause/Cancel remains clickable.
+        self._list.setEnabled(True)
+        # But freeze editing while a sync is running to avoid racey config edits.
+        for i in range(self._list.count()):
+            item = self._list.item(i)
+            w = self._list.itemWidget(item)
+            if isinstance(w, _PlaylistCard):
+                w.set_editing_enabled(not running)
+
+    @QtCore.Slot()
+    def _add_playlist(self) -> None:
+        r = PlaylistRow(
+            name="New Playlist",
+            url="https://www.youtube.com/playlist?list=",
+            download_mode="video",
+            max_download_quality="1080p",
+            save_path="./downloads",
+        )
+        widget = _PlaylistCard(r, index=self._list.count())
+        widget.sync_clicked.connect(self.sync_one_requested.emit)
+        widget.remove_clicked.connect(self._remove_at_index)
+        widget.cancel_clicked.connect(lambda _pid: self._cancel_sync())
+        widget.pause_changed.connect(self._on_pause_changed)
+        widget.changed.connect(self._schedule_autosave)
+        item = QtWidgets.QListWidgetItem()
+        item.setSizeHint(widget.sizeHint())
+        self._list.addItem(item)
+        self._list.setItemWidget(item, widget)
+        self._schedule_autosave()
+
+    @QtCore.Slot()
+    def _remove_at_index(self, index: int) -> None:
+        if index < 0 or index >= self._list.count():
+            return
+        self._list.takeItem(index)
+        self._reindex_cards()
+        self._schedule_autosave()
+
+    @QtCore.Slot(bool)
+    def _on_pause_changed(self, paused: bool) -> None:
+        if paused:
+            self.pause_requested.emit()
+            self._sync_state.setText("Paused")
+        else:
+            self.resume_requested.emit()
+            self._sync_state.setText("Resumed")
+
+    def _table_to_playlists(self) -> list[dict[str, Any]]:
+        playlists: list[dict[str, Any]] = []
+        for i in range(self._list.count()):
+            item = self._list.item(i)
+            w = self._list.itemWidget(item)
+            if not isinstance(w, _PlaylistCard):
+                continue
+            pl = w.to_dict()
+            playlists.append(pl)
+        return playlists
+
+    @QtCore.Slot()
+    def _save_config(self) -> None:
+        if self._config_path is None:
+            self._status.setText("No config path loaded.")
+            return
+        try:
+            if not self._validate_all(show_status=True):
+                return
+            data = dict(self._config or {})
+            data["playlists"] = self._table_to_playlists()
+            save_config(self._config_path, data)
+            self._status.setText(f"Saved {len(data['playlists'])} playlists to {self._config_path}.")
+            # Reload settings to reflect merged defaults
+            self.reload_from_config()
+        except Exception as exc:
+            self._status.setText(f"Failed to save config: {exc}")
+
+    def _reindex_cards(self) -> None:
+        for i in range(self._list.count()):
+            item = self._list.item(i)
+            w = self._list.itemWidget(item)
+            if isinstance(w, _PlaylistCard):
+                w.set_index(i)
+
+    def _validate_all(self, *, show_status: bool) -> bool:
+        ok = True
+        for i in range(self._list.count()):
+            item = self._list.item(i)
+            w = self._list.itemWidget(item)
+            if isinstance(w, _PlaylistCard):
+                errs = w.validate()
+                w.set_status("; ".join(errs) if errs else "")
+                if errs:
+                    ok = False
+        if not ok and show_status:
+            self._status.setText("Fix invalid playlists before saving/syncing.")
+        return ok
+
+    @QtCore.Slot()
+    def _schedule_autosave(self) -> None:
+        if self._suppress_autosave:
+            return
+        if not self.isEnabled():
+            return
+        self._autosave_timer.start()
+
+    @QtCore.Slot()
+    def _autosave_now(self) -> None:
+        if self._config_path is None:
+            return
+        if self._suppress_autosave:
+            return
+        if not self._validate_all(show_status=False):
+            # Don't autosave invalid configs; user sees inline errors.
+            return
+        try:
+            data = dict(self._config or {})
+            data["playlists"] = self._table_to_playlists()
+            save_config(self._config_path, data)
+            self._status.setText(f"Autosaved to {self._config_path}.")
+        except Exception as exc:
+            self._status.setText(f"Autosave failed: {exc}")
+
+    def on_event(self, name: str, payload: dict) -> None:
+        if name == "SyncStarted":
+            pid = payload.get("playlist_id")
+            total = payload.get("actions_total")
+            self._sync_state.setText(f"Sync started: {pid} ({total} actions)")
+            self._set_card_status(str(pid or ""), "running")
+            self._set_active_card(str(pid or ""), running=True, paused=False)
+        elif name == "SyncSummary":
+            pid = payload.get("playlist_id")
+            dur = payload.get("duration_s")
+            counts = payload.get("counts")
+            self._sync_state.setText(f"Sync summary: {pid} in {dur}s counts={counts}")
+            self._set_card_status(str(pid or ""), f"done in {dur}s")
+            ls = payload.get("last_sync")
+            if ls:
+                self._set_card_last_sync(str(pid or ""), str(ls))
+        elif name == "SyncFinished":
+            pid = payload.get("playlist_id")
+            self._sync_state.setText(f"Sync finished: {pid}")
+            self._set_card_status(str(pid or ""), "finished")
+            self._set_active_card(str(pid or ""), running=False, paused=False)
+            self.set_running(False)
+        elif name == "SyncError":
+            self._sync_state.setText(f"Sync error: {payload.get('error')}")
+            self.set_running(False)
+            # Ensure any card in "pause" mode returns to Sync.
+            pid = str(payload.get("playlist_id") or "")
+            if pid:
+                self._set_active_card(pid, running=False, paused=False)
+        elif name == "DownloadStarted":
+            pid = str(payload.get("playlist_id") or "")
+            vid = str(payload.get("video_id") or "")
+            if not pid:
+                return
+            self._download_state_by_pid[pid] = {"video_id": vid, "progress": 0.0, "status": "started"}
+            self._set_card_progress(pid, 0.0)
+            self._set_card_status(pid, f"downloading {vid}".strip())
+        elif name == "DownloadProgress":
+            pid = str(payload.get("playlist_id") or "")
+            vid = str(payload.get("video_id") or "")
+            prog = payload.get("progress")
+            if not pid:
+                return
+            if isinstance(prog, (int, float)):
+                p = float(prog)
+                self._download_state_by_pid.setdefault(pid, {})["progress"] = p
+                if vid:
+                    self._download_state_by_pid[pid]["video_id"] = vid
+                self._download_state_by_pid[pid]["status"] = str(payload.get("status") or "downloading")
+                self._set_card_progress(pid, p)
+                pct = int(round(max(0.0, min(1.0, p)) * 100))
+                st = str(payload.get("status") or "downloading")
+                tail = f"{vid} {pct}%" if vid else f"{pct}%"
+                self._set_card_status(pid, f"{st} {tail}".strip())
+        elif name == "DownloadCompleted":
+            pid = str(payload.get("playlist_id") or "")
+            if pid:
+                vid = str(payload.get("video_id") or self._download_state_by_pid.get(pid, {}).get("video_id") or "")
+                self._set_card_progress(pid, 1.0)
+                self._download_state_by_pid.pop(pid, None)
+                self._set_card_status(pid, f"completed {vid}".strip())
+        elif name == "DownloadFailed":
+            pid = str(payload.get("playlist_id") or "")
+            if not pid:
+                return
+            vid = str(payload.get("video_id") or self._download_state_by_pid.get(pid, {}).get("video_id") or "")
+            err = str(payload.get("error") or "").strip()
+            self._download_state_by_pid.pop(pid, None)
+            self._set_card_status(pid, f"failed {vid}: {err}" if err else f"failed {vid}".strip())
+        elif name == "SyncPaused":
+            pid = str(payload.get("playlist_id") or "")
+            if not pid:
+                return
+            self._set_card_status(pid, str(payload.get("reason") or "paused"))
+            self._set_active_card(pid, running=True, paused=True)
+
+    def _set_card_progress(self, playlist_id: str, progress: float) -> None:
+        for i in range(self._list.count()):
+            item = self._list.item(i)
+            w = self._list.itemWidget(item)
+            if isinstance(w, _PlaylistCard) and w.playlist_id() == playlist_id:
+                w.set_progress(progress)
+
+    def _set_card_status(self, playlist_id: str, text: str) -> None:
+        for i in range(self._list.count()):
+            item = self._list.item(i)
+            w = self._list.itemWidget(item)
+            if isinstance(w, _PlaylistCard):
+                if w.playlist_id() == playlist_id:
+                    w.set_status(text)
+
+    def _set_card_last_sync(self, playlist_id: str, last_sync: str) -> None:
+        for i in range(self._list.count()):
+            item = self._list.item(i)
+            w = self._list.itemWidget(item)
+            if isinstance(w, _PlaylistCard) and w.playlist_id() == playlist_id:
+                w.set_last_sync(last_sync)
+
+    def _set_active_card(self, playlist_id: str, *, running: bool, paused: bool) -> None:
+        for i in range(self._list.count()):
+            item = self._list.item(i)
+            w = self._list.itemWidget(item)
+            if not isinstance(w, _PlaylistCard):
+                continue
+            is_active = w.playlist_id() == playlist_id
+            w.set_active(is_active and running)
+            if is_active:
+                w.set_paused(paused)
+
+
+class _PlaylistCard(QtWidgets.QFrame):
+    sync_clicked = QtCore.Signal(int)
+    remove_clicked = QtCore.Signal(int)
+    cancel_clicked = QtCore.Signal(str)
+    pause_changed = QtCore.Signal(bool)
+    changed = QtCore.Signal()
+
+    def __init__(self, row: PlaylistRow, *, index: int, last_sync: str | None = None, parent: QtWidgets.QWidget | None = None) -> None:
+        super().__init__(parent)
+        self.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
+        self.setObjectName("playlistCard")
+        self.setAttribute(QtCore.Qt.WidgetAttribute.WA_StyledBackground, True)
+        self.setStyleSheet(
+            """
+            QFrame#playlistCard {
+              background: #171b22;
+              border: 1px solid #2a3140;
+              border-radius: 12px;
+            }
+            """
+        )
+        self._index = index
+        self._active = False
+        self._paused = False
+
+        self._name_value = row.name
+        self._name_label = QtWidgets.QLabel(self._name_value or "Playlist")
+        self._name_label.setStyleSheet("font-weight: 600; font-size: 14px;")
+
+        self._name_edit = QtWidgets.QLineEdit(self._name_value)
+        self._name_edit.setMinimumHeight(32)
+        self._name_edit.editingFinished.connect(self._finish_name_edit)
+        self._name_stack = QtWidgets.QStackedWidget()
+        self._name_stack.addWidget(self._name_label)
+        self._name_stack.addWidget(self._name_edit)
+        self._name_stack.setCurrentIndex(0)
+
+        self._url = QtWidgets.QLineEdit(row.url)
+
+        self._mode = QtWidgets.QComboBox()
+        self._mode.addItems(["video", "audio", "both"])
+        self._mode.setCurrentText(row.download_mode or "video")
+
+        self._quality = QtWidgets.QComboBox()
+        self._quality.addItems(["best", "2160p", "1440p", "1080p", "720p", "480p", "360p"])
+        self._quality.setEditable(False)
+        self._quality.setCurrentText(row.max_download_quality or "1080p")
+
+        self._save_path = QtWidgets.QLineEdit(row.save_path)
+
+        for w in (self._url, self._mode, self._quality, self._save_path):
+            w.setMinimumHeight(32)
+        self._url.editingFinished.connect(self.changed.emit)
+        self._save_path.editingFinished.connect(self.changed.emit)
+        self._mode.currentIndexChanged.connect(lambda _i: self.changed.emit())
+        self._quality.currentIndexChanged.connect(lambda _i: self.changed.emit())
+
+        self._status = QtWidgets.QLabel("")
+        self._status.setStyleSheet("color: #9fb0c6;")
+        self._meta = QtWidgets.QLabel(f"Last sync: {last_sync or 'never'}")
+        self._meta.setStyleSheet("color: #7f8aa3;")
+        self._progress = QtWidgets.QProgressBar()
+        self._progress.setRange(0, 100)
+        self._progress.setValue(0)
+        self._progress.setTextVisible(False)
+        self._progress.setFixedHeight(6)
+        self._sync_btn = QtWidgets.QPushButton("Sync")
+        self._sync_btn.clicked.connect(self._on_sync_or_pause_clicked)
+
+        self._edit_name_btn = QtWidgets.QToolButton()
+        self._edit_name_btn.setAutoRaise(True)
+        self._edit_name_btn.setCursor(QtCore.Qt.CursorShape.PointingHandCursor)
+        self._edit_name_btn.setIconSize(QtCore.QSize(16, 16))
+        self._edit_name_btn.setFixedSize(28, 28)
+        icon = QtGui.QIcon.fromTheme("document-edit")
+        if not icon.isNull():
+            self._edit_name_btn.setIcon(icon)
+        else:
+            self._edit_name_btn.setText("✎")
+        self._edit_name_btn.clicked.connect(self._toggle_name_edit)
+
+        self._remove_btn = QtWidgets.QToolButton()
+        self._remove_btn.setAutoRaise(True)
+        self._remove_btn.setCursor(QtCore.Qt.CursorShape.PointingHandCursor)
+        self._remove_btn.setIconSize(QtCore.QSize(16, 16))
+        self._remove_btn.setFixedSize(28, 28)
+        remove_icon = QtGui.QIcon.fromTheme("edit-delete")
+        if not remove_icon.isNull():
+            self._remove_btn.setIcon(remove_icon)
+        else:
+            self._remove_btn.setText("X")
+        self._remove_btn.setToolTip("Remove playlist")
+        self._remove_btn.clicked.connect(lambda: self.remove_clicked.emit(self._index))
+
+        self._cancel_btn = QtWidgets.QToolButton()
+        self._cancel_btn.setAutoRaise(True)
+        self._cancel_btn.setCursor(QtCore.Qt.CursorShape.PointingHandCursor)
+        self._cancel_btn.setIconSize(QtCore.QSize(16, 16))
+        self._cancel_btn.setFixedSize(28, 28)
+        stop_icon = QtGui.QIcon.fromTheme("process-stop")
+        if not stop_icon.isNull():
+            self._cancel_btn.setIcon(stop_icon)
+        else:
+            self._cancel_btn.setText("■")
+        self._cancel_btn.setToolTip("Cancel this playlist sync")
+        self._cancel_btn.setEnabled(False)
+        self._cancel_btn.clicked.connect(lambda: self.cancel_clicked.emit(self.playlist_id()))
+
+        header = QtWidgets.QHBoxLayout()
+        header.addWidget(self._name_stack, 0)
+        header.addWidget(self._edit_name_btn, 0)
+        header.addWidget(self._remove_btn, 0)
+        header.addWidget(self._cancel_btn, 0)
+        header.addStretch(1)
+        header.addWidget(self._sync_btn)
+
+        form = QtWidgets.QFormLayout()
+        form.setLabelAlignment(QtCore.Qt.AlignmentFlag.AlignLeft)
+        form.setFormAlignment(QtCore.Qt.AlignmentFlag.AlignTop)
+        form.setVerticalSpacing(10)
+        form.setHorizontalSpacing(12)
+        form.addRow("URL", self._url)
+        form.addRow("Mode", self._mode)
+        form.addRow("Max Quality", self._quality)
+        form.addRow("Save Path", self._save_path)
+
+        outer = QtWidgets.QVBoxLayout()
+        outer.addLayout(header)
+        outer.addLayout(form)
+        outer.addWidget(self._meta)
+        outer.addWidget(self._progress)
+        outer.addWidget(self._status)
+        self.setLayout(outer)
+
+        # Give the card a bit more breathing room so controls don't feel cramped.
+        self.setMinimumHeight(self.sizeHint().height() + 16)
+
+    def to_dict(self) -> dict[str, Any]:
+        name = self._name_value.strip()
+        url = self._url.text().strip()
+        mode = self._mode.currentText().strip() or "video"
+        max_q = self._quality.currentText().strip() or "1080p"
+        save_path = self._save_path.text().strip() or "./downloads"
+
+        pl: dict[str, Any] = {"url": url, "download_mode": mode, "max_download_quality": max_q, "save_path": save_path}
+        if name:
+            pl["name"] = name
+        return pl
+
+    def set_status(self, text: str) -> None:
+        self._status.setText(text)
+
+    def set_index(self, index: int) -> None:
+        self._index = index
+
+    def set_active(self, active: bool) -> None:
+        self._active = bool(active)
+        self._cancel_btn.setEnabled(self._active)
+        if not self._active:
+            self._paused = False
+            self._sync_btn.setText("Sync")
+        else:
+            self._sync_btn.setText("Resume" if self._paused else "Pause")
+
+    def set_paused(self, paused: bool) -> None:
+        self._paused = bool(paused)
+        if self._active:
+            self._sync_btn.setText("Resume" if self._paused else "Pause")
+
+    def set_editing_enabled(self, enabled: bool) -> None:
+        # Editing controls only (Sync/Pause/Cancel must remain usable).
+        self._url.setEnabled(enabled)
+        self._mode.setEnabled(enabled)
+        self._quality.setEnabled(enabled)
+        self._save_path.setEnabled(enabled)
+        self._edit_name_btn.setEnabled(enabled)
+        self._remove_btn.setEnabled(enabled)
+        # Explicitly keep runtime controls enabled even while editing is locked.
+        self._sync_btn.setEnabled(True)
+        self._cancel_btn.setEnabled(self._active)
+        if not enabled and self._name_stack.currentIndex() == 1:
+            # Force exit name edit if a sync starts mid-edit.
+            self._finish_name_edit()
+
+    def playlist_id(self) -> str:
+        url = (self._url.text() or "").strip()
+        return extract_playlist_id(url) or url
+
+    def set_progress(self, progress: float) -> None:
+        pct = max(0, min(100, int(round(progress * 100))))
+        self._progress.setValue(pct)
+
+    def set_last_sync(self, last_sync: str) -> None:
+        self._meta.setText(f"Last sync: {last_sync or 'never'}")
+
+    def validate(self) -> list[str]:
+        errs: list[str] = []
+        url = self._url.text().strip()
+        if not url or not (url.startswith("http://") or url.startswith("https://")):
+            errs.append("URL required")
+        mode = self._mode.currentText().strip()
+        if mode not in {"video", "audio", "both"}:
+            errs.append("invalid mode")
+        q = self._quality.currentText().strip().lower()
+        if not q.endswith("p") or not any(ch.isdigit() for ch in q):
+            errs.append("invalid quality")
+        sp = self._save_path.text().strip()
+        if not sp:
+            errs.append("save_path required")
+        return errs
+
+    def _toggle_name_edit(self) -> None:
+        self._name_edit.setText(self._name_value)
+        self._name_stack.setCurrentIndex(1)
+        self._edit_name_btn.setVisible(False)
+        self._name_edit.setFocus()
+        self._name_edit.selectAll()
+
+    def _finish_name_edit(self) -> None:
+        new_name = self._name_edit.text().strip()
+        self._name_value = new_name
+        self._name_label.setText(new_name or "Playlist")
+        self._name_stack.setCurrentIndex(0)
+        self._edit_name_btn.setVisible(True)
+        self.changed.emit()
+
+    def _on_sync_or_pause_clicked(self) -> None:
+        if not self._active:
+            self.sync_clicked.emit(self._index)
+            return
+        self._paused = not self._paused
+        self._sync_btn.setText("Resume" if self._paused else "Pause")
+        self.pause_changed.emit(self._paused)

src/app/gui/pages/queue.py

@@ -0,0 +1,215 @@
+from __future__ import annotations
+
+from PySide6 import QtCore, QtWidgets
+
+from ..smooth_scroll import enable_smooth_scrolling
+
+
+class QueuePage(QtWidgets.QWidget):
+    cancel_sync_requested = QtCore.Signal()
+
+    def __init__(self, parent: QtWidgets.QWidget | None = None) -> None:
+        super().__init__(parent)
+        self.setObjectName("queuePage")
+        # Map (playlist_id, video_id) to a stable item; its `.row()` tracks sorting moves.
+        self._rows_by_key: dict[tuple[str, str], QtWidgets.QTableWidgetItem] = {}
+        self._pending_by_key: dict[tuple[str, str], dict] = {}
+        self._playlist_labels: dict[str, str] = {}
+
+        self._flush_timer = QtCore.QTimer(self)
+        self._flush_timer.setInterval(150)
+        self._flush_timer.timeout.connect(self._flush_pending)
+        self._flush_timer.start()
+
+        layout = QtWidgets.QVBoxLayout(self)
+        title = QtWidgets.QLabel("Queue")
+        title.setObjectName("pageTitle")
+
+        top = QtWidgets.QHBoxLayout()
+        top.addWidget(title)
+        top.addStretch(1)
+        clear_btn = QtWidgets.QPushButton("Clear completed")
+        clear_btn.clicked.connect(self._clear_completed)
+        cancel_btn = QtWidgets.QPushButton("Cancel all")
+        cancel_btn.clicked.connect(self.cancel_sync_requested.emit)
+        top.addWidget(clear_btn)
+        top.addWidget(cancel_btn)
+        layout.addLayout(top)
+
+        self._table = QtWidgets.QTableWidget(0, 7)
+        self._table.setHorizontalHeaderLabels(["Playlist", "Video ID", "Status", "Progress", "Speed", "ETA", "Target/File"])
+        self._table.horizontalHeader().setStretchLastSection(True)
+        self._table.setEditTriggers(QtWidgets.QAbstractItemView.EditTrigger.NoEditTriggers)
+        self._table.setSelectionBehavior(QtWidgets.QAbstractItemView.SelectionBehavior.SelectRows)
+        self._table.setSelectionMode(QtWidgets.QAbstractItemView.SelectionMode.SingleSelection)
+        self._table.setSortingEnabled(True)
+        self._table.setVerticalScrollMode(QtWidgets.QAbstractItemView.ScrollMode.ScrollPerPixel)
+        enable_smooth_scrolling(self._table)
+        layout.addWidget(self._table, 1)
+
+        self._hint = QtWidgets.QLabel("Waiting for downloads…")
+        layout.addWidget(self._hint)
+
+    def on_event(self, name: str, payload: dict) -> None:
+        if name not in {"DownloadStarted", "DownloadProgress", "DownloadCompleted", "DownloadFailed"}:
+            return
+        vid = str(payload.get("video_id") or "")
+        if not vid:
+            return
+        pid = str(payload.get("playlist_id") or "")
+        key = (pid, vid)
+
+        latest = dict(payload)
+        latest["_event"] = name
+        self._pending_by_key[key] = latest
+
+    def set_playlist_labels(self, labels: dict[str, str]) -> None:
+        self._playlist_labels = dict(labels)
+        # Update any existing rows to reflect new names.
+        for row in range(self._table.rowCount()):
+            pl_item = self._table.item(row, 0)
+            if pl_item is None:
+                continue
+            pid = pl_item.data(QtCore.Qt.ItemDataRole.UserRole)
+            if not pid:
+                continue
+            pl_item.setText(self._playlist_labels.get(str(pid), str(pid)))
+
+    def _ensure_row(self, key: tuple[str, str]) -> int:
+        vid_item = self._rows_by_key.get(key)
+        if vid_item is not None and vid_item.row() >= 0:
+            return int(vid_item.row())
+
+        pid, vid = key
+        row = self._table.rowCount()
+        self._table.insertRow(row)
+
+        label = self._playlist_labels.get(pid, pid)
+        pl_item = QtWidgets.QTableWidgetItem(label)
+        # Keep the real playlist_id even if the displayed label changes.
+        pl_item.setData(QtCore.Qt.ItemDataRole.UserRole, pid)
+        pl_item.setToolTip(pid)
+        self._table.setItem(row, 0, pl_item)
+
+        vid_item = QtWidgets.QTableWidgetItem(vid)
+        self._table.setItem(row, 1, vid_item)
+
+        self._table.setItem(row, 2, QtWidgets.QTableWidgetItem("queued"))
+        self._table.setItem(row, 3, QtWidgets.QTableWidgetItem(""))
+        self._table.setItem(row, 4, QtWidgets.QTableWidgetItem(""))
+        self._table.setItem(row, 5, QtWidgets.QTableWidgetItem(""))
+        self._table.setItem(row, 6, QtWidgets.QTableWidgetItem(""))
+        self._rows_by_key[key] = vid_item
+        return row
+
+    def _ensure_item(self, row: int, col: int, default: str = "") -> QtWidgets.QTableWidgetItem:
+        item = self._table.item(row, col)
+        if item is None:
+            item = QtWidgets.QTableWidgetItem(default)
+            self._table.setItem(row, col, item)
+        return item
+
+    @QtCore.Slot()
+    def _flush_pending(self) -> None:
+        if not self._pending_by_key:
+            return
+
+        pending = dict(self._pending_by_key)
+        self._pending_by_key.clear()
+
+        sorting_was_enabled = self._table.isSortingEnabled()
+        if sorting_was_enabled:
+            self._table.setSortingEnabled(False)
+
+        try:
+            for key, payload in pending.items():
+                name = str(payload.pop("_event", ""))
+                row = self._ensure_row(key)
+
+                status_item = self._ensure_item(row, 2, "queued")
+                progress_item = self._ensure_item(row, 3, "")
+                speed_item = self._ensure_item(row, 4, "")
+                eta_item = self._ensure_item(row, 5, "")
+                target_item = self._ensure_item(row, 6, "")
+
+                if name == "DownloadStarted":
+                    status_item.setText("started")
+                    tgt = payload.get("target") or payload.get("filename") or ""
+                    if tgt:
+                        target_item.setText(str(tgt))
+                elif name == "DownloadProgress":
+                    status_item.setText(str(payload.get("status") or "downloading"))
+                    prog = payload.get("progress")
+                    if isinstance(prog, (int, float)):
+                        pct = max(0, min(100, int(round(prog * 100))))
+                        bar = self._table.cellWidget(row, 3)
+                        if bar is None:
+                            bar = QtWidgets.QProgressBar()
+                            bar.setRange(0, 100)
+                            bar.setTextVisible(True)
+                            self._table.setCellWidget(row, 3, bar)
+                        bar.setValue(pct)
+                    sp = payload.get("speed")
+                    if isinstance(sp, (int, float)) and sp > 0:
+                        speed_item.setText(f"{sp/1024/1024:.2f} MiB/s")
+                    et = payload.get("eta")
+                    if isinstance(et, (int, float)) and et >= 0:
+                        eta_item.setText(f"{int(et)}s")
+                    fn = payload.get("filename")
+                    if fn:
+                        target_item.setText(str(fn))
+                elif name == "DownloadCompleted":
+                    status_item.setText("completed")
+                    tgt = payload.get("target") or ""
+                    if tgt:
+                        target_item.setText(str(tgt))
+                    bar = self._table.cellWidget(row, 3)
+                    if bar is None:
+                        bar = QtWidgets.QProgressBar()
+                        bar.setRange(0, 100)
+                        bar.setTextVisible(True)
+                        self._table.setCellWidget(row, 3, bar)
+                    bar.setValue(100)
+                    speed_item.setText("")
+                    eta_item.setText("")
+                elif name == "DownloadFailed":
+                    status_item.setText("failed")
+                    self._table.removeCellWidget(row, 3)
+                    progress_item.setText("")
+                    speed_item.setText("")
+                    eta_item.setText("")
+                    err = payload.get("error")
+                    if err:
+                        target_item.setText(str(err))
+        finally:
+            if sorting_was_enabled:
+                self._table.setSortingEnabled(True)
+
+        self._hint.setText(f"{len(self._rows_by_key)} job(s) seen.")
+
+    def _clear_completed(self) -> None:
+        to_remove: list[tuple[int, tuple[str, str]]] = []
+        for key, vid_item in list(self._rows_by_key.items()):
+            row = int(vid_item.row())
+            if row < 0:
+                self._rows_by_key.pop(key, None)
+                continue
+            st = self._table.item(row, 2)
+            if st and st.text() == "completed":
+                to_remove.append((row, key))
+
+        for row, key in sorted(to_remove, key=lambda x: x[0], reverse=True):
+            self._table.removeRow(row)
+            self._rows_by_key.pop(key, None)
+
+        # Rebuild mapping since row indices/items may have shifted.
+        rebuilt: dict[tuple[str, str], QtWidgets.QTableWidgetItem] = {}
+        for r in range(self._table.rowCount()):
+            pl_item = self._table.item(r, 0)
+            v_item = self._table.item(r, 1)
+            if pl_item is None or v_item is None:
+                continue
+            pid = pl_item.data(QtCore.Qt.ItemDataRole.UserRole) or pl_item.text()
+            vid = v_item.text()
+            rebuilt[(str(pid), str(vid))] = v_item
+        self._rows_by_key = rebuilt

src/app/gui/pages/settings.py

@@ -0,0 +1,165 @@
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Any
+
+from PySide6 import QtCore, QtWidgets
+
+from ..config_store import load_config, save_config
+
+
+class SettingsPage(QtWidgets.QWidget):
+    def __init__(self, parent: QtWidgets.QWidget | None = None) -> None:
+        super().__init__(parent)
+        self.setObjectName("settingsPage")
+        self._config_path: Path | None = None
+        self._config: dict[str, Any] = {}
+
+        layout = QtWidgets.QVBoxLayout(self)
+        title = QtWidgets.QLabel("Settings")
+        title.setObjectName("pageTitle")
+        layout.addWidget(title)
+
+        form = QtWidgets.QFormLayout()
+
+        self._ffmpeg_path = QtWidgets.QLineEdit()
+        self._ffmpeg_path.setPlaceholderText("./bin/ffmpeg.exe (Windows) or ./bin/ffmpeg (Linux)")
+        form.addRow("ffmpeg_path", self._ffmpeg_path)
+
+        self._max_parallel = QtWidgets.QSpinBox()
+        self._max_parallel.setRange(1, 64)
+        form.addRow("max_parallel_downloads", self._max_parallel)
+
+        self._retry_max = QtWidgets.QSpinBox()
+        self._retry_max.setRange(0, 20)
+        form.addRow("retry_max_retries", self._retry_max)
+
+        self._retry_delay = QtWidgets.QDoubleSpinBox()
+        self._retry_delay.setRange(0.0, 60.0)
+        self._retry_delay.setDecimals(2)
+        self._retry_delay.setSingleStep(0.25)
+        form.addRow("retry_delay_seconds", self._retry_delay)
+
+        self._download_delay = QtWidgets.QDoubleSpinBox()
+        self._download_delay.setRange(0.0, 600.0)
+        self._download_delay.setDecimals(2)
+        self._download_delay.setSingleStep(0.25)
+        form.addRow("delay_between_downloads_seconds", self._download_delay)
+
+        form_box = QtWidgets.QGroupBox("Global defaults")
+        form_box.setLayout(form)
+        layout.addWidget(form_box)
+
+        tray_form = QtWidgets.QFormLayout()
+        self._close_to_tray = QtWidgets.QCheckBox()
+        self._close_to_tray.setChecked(False)
+        tray_form.addRow("close_to_tray", self._close_to_tray)
+
+        self._minimize_to_tray = QtWidgets.QCheckBox()
+        self._minimize_to_tray.setChecked(False)
+        tray_form.addRow("minimize_to_tray", self._minimize_to_tray)
+
+        self._start_minimized_to_tray = QtWidgets.QCheckBox()
+        self._start_minimized_to_tray.setChecked(False)
+        tray_form.addRow("start_minimized_to_tray", self._start_minimized_to_tray)
+
+        tray_box = QtWidgets.QGroupBox("Tray behavior")
+        tray_box.setLayout(tray_form)
+        layout.addWidget(tray_box)
+
+        btns = QtWidgets.QHBoxLayout()
+        self._reload_btn = QtWidgets.QPushButton("Reload")
+        self._reload_btn.clicked.connect(self.reload_from_config)
+        self._save_btn = QtWidgets.QPushButton("Save")
+        self._save_btn.clicked.connect(self.save_to_config)
+        btns.addStretch(1)
+        btns.addWidget(self._reload_btn)
+        btns.addWidget(self._save_btn)
+        layout.addLayout(btns)
+
+        self._status = QtWidgets.QLabel("")
+        self._status.setWordWrap(True)
+        layout.addWidget(self._status)
+
+        self._suppress_autosave = False
+        self._autosave_timer = QtCore.QTimer(self)
+        self._autosave_timer.setSingleShot(True)
+        self._autosave_timer.setInterval(600)
+        self._autosave_timer.timeout.connect(self.save_to_config)
+
+        # Autosave on focus-out / change.
+        self._ffmpeg_path.editingFinished.connect(self._schedule_autosave)
+        self._max_parallel.valueChanged.connect(lambda _v: self._schedule_autosave())
+        self._retry_max.valueChanged.connect(lambda _v: self._schedule_autosave())
+        self._retry_delay.valueChanged.connect(lambda _v: self._schedule_autosave())
+        self._download_delay.valueChanged.connect(lambda _v: self._schedule_autosave())
+        self._close_to_tray.stateChanged.connect(lambda _v: self._schedule_autosave())
+        self._minimize_to_tray.stateChanged.connect(lambda _v: self._schedule_autosave())
+        self._start_minimized_to_tray.stateChanged.connect(lambda _v: self._schedule_autosave())
+
+    def set_config_path(self, path: Path) -> None:
+        self._config_path = path
+        self.reload_from_config()
+
+    @QtCore.Slot()
+    def reload_from_config(self) -> None:
+        if self._config_path is None:
+            self._status.setText("No config loaded yet.")
+            return
+        try:
+            self._suppress_autosave = True
+            cfg = load_config(self._config_path)
+            self._config = dict(cfg.data)
+
+            self._ffmpeg_path.setText(str(self._config.get("ffmpeg_path") or ""))
+            self._max_parallel.setValue(int(self._config.get("max_parallel_downloads") or 2))
+            self._retry_max.setValue(int(self._config.get("retry_max_retries") or 2))
+            self._retry_delay.setValue(float(self._config.get("retry_delay_seconds") or 1.5))
+            self._download_delay.setValue(float(self._config.get("delay_between_downloads_seconds") or 0.0))
+
+            ui = self._config.get("ui")
+            ui = ui if isinstance(ui, dict) else {}
+            tray = ui.get("tray")
+            tray = tray if isinstance(tray, dict) else {}
+            self._close_to_tray.setChecked(bool(tray.get("close_to_tray", False)))
+            self._minimize_to_tray.setChecked(bool(tray.get("minimize_to_tray", False)))
+            self._start_minimized_to_tray.setChecked(bool(tray.get("start_minimized_to_tray", False)))
+
+            self._status.setText(f"Loaded settings from {self._config_path}.")
+        except Exception as exc:
+            self._status.setText(f"Failed to load settings: {exc}")
+        finally:
+            self._suppress_autosave = False
+
+    def _schedule_autosave(self) -> None:
+        if self._suppress_autosave:
+            return
+        self._autosave_timer.start()
+
+    @QtCore.Slot()
+    def save_to_config(self) -> None:
+        if self._config_path is None:
+            self._status.setText("No config loaded yet.")
+            return
+        try:
+            data = dict(self._config or {})
+            data["ffmpeg_path"] = self._ffmpeg_path.text().strip() or data.get("ffmpeg_path")
+            data["max_parallel_downloads"] = int(self._max_parallel.value())
+            data["retry_max_retries"] = int(self._retry_max.value())
+            data["retry_delay_seconds"] = float(self._retry_delay.value())
+            data["delay_between_downloads_seconds"] = float(self._download_delay.value())
+
+            ui = data.get("ui")
+            ui = ui if isinstance(ui, dict) else {}
+            tray = ui.get("tray")
+            tray = tray if isinstance(tray, dict) else {}
+            tray["close_to_tray"] = bool(self._close_to_tray.isChecked())
+            tray["minimize_to_tray"] = bool(self._minimize_to_tray.isChecked())
+            tray["start_minimized_to_tray"] = bool(self._start_minimized_to_tray.isChecked())
+            ui["tray"] = tray
+            data["ui"] = ui
+
+            save_config(self._config_path, data)
+            self._status.setText(f"Saved settings to {self._config_path}.")
+        except Exception as exc:
+            self._status.setText(f"Failed to save settings: {exc}")

src/app/gui/runner.py

@@ -0,0 +1,74 @@
+from __future__ import annotations
+
+import asyncio
+import threading
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Any, Dict
+
+from PySide6 import QtCore
+
+from ..core.database.db import Database
+from ..core.sync.executor import ActionExecutor
+from ..core.sync.service import SyncService
+from ..core.events.event_bus import EventBus
+
+
+@dataclass(frozen=True)
+class SyncRequest:
+    playlist_cfg: Dict[str, Any]
+    apply: bool = True
+    db_path: Path = Path("db/app.db")
+    cancel_flag: threading.Event | None = None
+    pause_flag: threading.Event | None = None
+
+
+class SyncRunner(QtCore.QObject):
+    """
+    Runs a sync in the background to keep the UI responsive.
+    """
+
+    finished = QtCore.Signal(bool, str)
+
+    def __init__(self, bus: EventBus, parent: QtCore.QObject | None = None) -> None:
+        super().__init__(parent)
+        self._bus = bus
+        self._req: SyncRequest | None = None
+
+    @QtCore.Slot(object)
+    def set_request(self, req: SyncRequest) -> None:
+        self._req = req
+
+    @QtCore.Slot()
+    def run_current(self) -> None:
+        if self._req is None:
+            self.finished.emit(False, "no request")
+            return
+        self.run(self._req)
+
+    @QtCore.Slot(object)
+    def run(self, req: SyncRequest) -> None:
+        try:
+            if req.cancel_flag is not None and req.cancel_flag.is_set():
+                self.finished.emit(False, "cancelled")
+                return
+
+            db = Database(req.db_path.resolve())
+            service = SyncService(db)
+            executor = ActionExecutor(db, concurrency=int(req.playlist_cfg.get("max_parallel_downloads", 2) or 2), event_bus=self._bus)
+
+            actions = service.sync_from_config(req.playlist_cfg)
+            if req.cancel_flag is not None and req.cancel_flag.is_set():
+                self.finished.emit(False, "cancelled")
+                return
+            if req.apply and actions:
+                cancel_check = req.cancel_flag.is_set if req.cancel_flag is not None else None
+                pause_check = req.pause_flag.is_set if req.pause_flag is not None else None
+                asyncio.run(executor.execute(actions, req.playlist_cfg, cancel_check=cancel_check, pause_check=pause_check))
+
+            if req.cancel_flag is not None and req.cancel_flag.is_set():
+                self.finished.emit(False, "cancelled")
+            else:
+                self.finished.emit(True, "done")
+        except Exception as exc:
+            self.finished.emit(False, str(exc))

src/app/gui/smooth_scroll.py

@@ -0,0 +1,60 @@
+from __future__ import annotations
+
+from PySide6 import QtCore, QtWidgets
+
+
+class _SmoothWheelFilter(QtCore.QObject):
+    def __init__(self, area: QtWidgets.QAbstractScrollArea, *, duration_ms: int = 140) -> None:
+        super().__init__(area)
+        self._area = area
+        self._duration_ms = max(60, int(duration_ms))
+        self._anim = QtCore.QPropertyAnimation(area.verticalScrollBar(), b"value", self)
+        self._anim.setEasingCurve(QtCore.QEasingCurve.Type.OutCubic)
+
+    def eventFilter(self, obj: QtCore.QObject, event: QtCore.QEvent) -> bool:  # noqa: N802
+        if event.type() != QtCore.QEvent.Type.Wheel:
+            return super().eventFilter(obj, event)
+
+        wheel = event  # type: ignore[assignment]
+        try:
+            angle_y = wheel.angleDelta().y()
+            pixel_y = wheel.pixelDelta().y()
+        except Exception:
+            return super().eventFilter(obj, event)
+
+        dy = pixel_y if pixel_y else angle_y
+        if dy == 0:
+            return True
+
+        sb = self._area.verticalScrollBar()
+        start = sb.value()
+
+        # Map a wheel "step" to a reasonable pixel delta; keep it snappy but not jarring.
+        base_step = 80
+        if pixel_y:
+            delta = -dy
+        else:
+            delta = int(round(-dy / 120.0 * base_step))
+
+        target = max(sb.minimum(), min(sb.maximum(), start + delta))
+        if target == start:
+            return True
+
+        self._anim.stop()
+        self._anim.setDuration(self._duration_ms)
+        self._anim.setStartValue(start)
+        self._anim.setEndValue(target)
+        self._anim.start()
+        return True
+
+
+def enable_smooth_scrolling(widget: QtWidgets.QAbstractScrollArea, *, duration_ms: int = 140) -> None:
+    """
+    Enables animated wheel scrolling for QAbstractScrollArea-derived widgets
+    (QListWidget, QTableWidget, QPlainTextEdit, etc.).
+    """
+    filt = _SmoothWheelFilter(widget, duration_ms=duration_ms)
+    widget.viewport().installEventFilter(filt)
+    # Keep a reference to avoid the filter being GC'd.
+    widget.setProperty("_smooth_wheel_filter", filt)
+

src/app/main.py

@@ -0,0 +1,57 @@
+"""
+Entry point for the backend (no GUI).
+
+For now, this verifies configuration + database setup and can run a one-off sync.
+Future iterations will wire up scheduler and a GUI.
+"""
+
+from __future__ import annotations
+
+import asyncio
+from pathlib import Path
+
+from .config.settings import Settings
+from .core.database.db import Database
+from .core.sync.service import SyncService
+from .core.sync.executor import ActionExecutor
+from .core.utils.yt import extract_playlist_id
+from .core.utils.deps import DependencyError
+
+
+def bootstrap(db_path: Path | None = None) -> None:
+    settings = Settings()
+    db = Database((db_path or Path("db/app.db")).resolve())
+    service = SyncService(db)
+    executor = ActionExecutor(db)
+
+    # Iterate configured playlists and compute actions (no execution yet)
+    for pl in settings.playlists:
+        try:
+            actions = service.sync_from_config(pl)
+            # Apply actions now
+            if actions:
+                print(f"Applying {len(actions)} actions for: {pl.get('url')}")
+                # Summarize before applying
+                counts = {}
+                for a in actions:
+                    counts[a.type] = counts.get(a.type, 0) + 1
+                summary = ", ".join(f"{k.name}:{v}" for k, v in counts.items())
+                print(f"Plan → {summary}")
+                # Execute
+                try:
+                    asyncio.run(executor.execute(actions, pl))
+                except DependencyError as e:
+                    print(f"ERROR: {e}")
+                    continue
+                # Post summary (no DB readback yet)
+                pid = extract_playlist_id(pl.get('url', '')) or pl.get('url', '')
+                db.set_playlist_last_sync(pid)
+                print("Applied actions.")
+            else:
+                print(f"No actions needed for: {pl.get('url')}")
+        except Exception as exc:  # keep bootstrap resilient during early dev
+            print(f"Failed to sync playlist {pl.get('url')}: {exc}")
+
+
+if __name__ == "__main__":
+    bootstrap()

tests/test_download_quality_format.py

@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+from app.core.download.downloader import Downloader
+
+
+def test_build_format_defaults_to_best_mp4():
+    fmt = Downloader.build_format(None)
+    assert "height<=1080" in fmt
+    assert fmt.endswith("/best[ext=mp4]")
+
+
+def test_build_format_applies_height_cap():
+    fmt = Downloader.build_format("720p")
+    assert "height<=720" in fmt
+

tests/test_event_surface.py

@@ -0,0 +1,83 @@
+from __future__ import annotations
+
+import asyncio
+import sys
+
+from app.core.download.downloader import Downloader
+from app.core.download.queue_manager import DownloadJob
+from app.core.events.event_bus import EventBus
+from app.core.models import PlaylistItem, SyncAction, SyncActionType
+from app.core.sync.executor import ActionExecutor
+
+
+def test_executor_emits_sync_events(tmp_path):
+    published: list[tuple[str, dict]] = []
+
+    class TestBus(EventBus):
+        async def publish(self, event_name: str, payload: dict) -> None:  # type: ignore[override]
+            published.append((event_name, dict(payload)))
+
+    class StubDB:
+        def update_local_filename(self, playlist_id: str, video_id: str, filename: str) -> None:
+            return None
+
+        def mark_downloaded(self, playlist_id: str, video_id: str, downloaded: bool) -> None:
+            return None
+
+    bus = TestBus()
+    ex = ActionExecutor(StubDB(), concurrency=1, event_bus=bus)  # type: ignore[arg-type]
+
+    item = PlaylistItem(playlist_id="p", video_id="v", title="t", playlist_index=1)
+    actions = [SyncAction(SyncActionType.SKIP, item=item, to_name="0001 - t.mp4")]
+
+    asyncio.run(ex.execute(actions, {"url": "p", "save_path": str(tmp_path)}))
+
+    names = [n for n, _ in published]
+    assert "SyncStarted" in names
+    assert "SyncSummary" in names
+    assert "SyncFinished" in names
+
+    summary = [p for n, p in published if n == "SyncSummary"][0]
+    assert summary["playlist_id"] == "p"
+    assert "duration_s" in summary
+    assert isinstance(summary["counts"], dict)
+
+
+def test_downloader_progress_hook_calls_callback(tmp_path, monkeypatch):
+    callbacks: list[dict] = []
+
+    class DummyYDL:
+        def __init__(self, opts):
+            self.opts = opts
+
+        def __enter__(self):
+            return self
+
+        def __exit__(self, exc_type, exc, tb):
+            return False
+
+        def download(self, urls):
+            hooks = self.opts.get("progress_hooks") or []
+            for h in hooks:
+                h({"status": "downloading", "downloaded_bytes": 50, "total_bytes": 100, "speed": 1.0, "eta": 1, "filename": "x"})
+                h({"status": "finished", "downloaded_bytes": 100, "total_bytes": 100, "speed": 1.0, "eta": 0, "filename": "x"})
+
+    dummy = type("yt_dlp", (), {"YoutubeDL": DummyYDL})
+    monkeypatch.setitem(sys.modules, "yt_dlp", dummy)
+
+    ffmpeg = tmp_path / "ffmpeg"
+    ffmpeg.write_text("x", encoding="utf-8")
+
+    job = DownloadJob(
+        item=PlaylistItem(playlist_id="p", video_id="v", title="t", playlist_index=1),
+        url="https://example.invalid",
+        output_path=tmp_path / "out.mp4",
+        ffmpeg_path=str(ffmpeg),
+    )
+    job.progress_callback = lambda payload: callbacks.append(dict(payload))
+
+    dl = Downloader()
+    asyncio.run(dl._download(job))  # type: ignore[attr-defined]
+
+    assert callbacks
+    assert any("progress" in c for c in callbacks)

tests/test_integration_audio.py

@@ -0,0 +1,80 @@
+from __future__ import annotations
+
+import os
+
+import pytest
+
+from app.core.database.db import Database
+from app.core.sync.executor import ActionExecutor
+from app.core.events.event_bus import EventBus
+from app.core.sync.service import SyncService
+
+
+PLAYLIST_URL = os.getenv("TEST_PLAYLIST_URL")
+
+
+def _require_integration():
+    if not os.getenv("INTEGRATION_TEST"):
+        pytest.skip("Set INTEGRATION_TEST=1 to enable real download tests")
+    if not PLAYLIST_URL:
+        pytest.skip("Set TEST_PLAYLIST_URL to enable real download tests")
+
+
+def _skip_if_bot_check(errors: list[str]) -> None:
+    msg = "\n".join(errors).lower()
+    if "sign in to confirm you’re not a bot" in msg or "sign in to confirm you're not a bot" in msg:
+        pytest.skip("YouTube bot-check blocked download; provide cookies to yt-dlp to run this test reliably")
+
+
+@pytest.mark.integration
+def test_integration_download_audio(tmp_path):
+    _require_integration()
+    if not os.getenv("FFMPEG_PATH"):
+        pytest.skip("Set FFMPEG_PATH to a working ffmpeg binary to enable audio extraction downloads")
+
+    db_path = tmp_path / "app.db"
+    save_path = tmp_path / "downloads"
+    save_path.mkdir(parents=True, exist_ok=True)
+
+    cfg = {
+        "url": PLAYLIST_URL,
+        "download_mode": "audio",
+        "save_path": str(save_path),
+        # Must be set to a real ffmpeg path for this test to pass.
+        "ffmpeg_path": os.getenv("FFMPEG_PATH"),
+        "max_download_quality": "1080p",
+    }
+
+    db = Database(db_path.resolve())
+    service = SyncService(db)
+    actions = service.sync_from_config(cfg)
+
+    download_actions = [a for a in actions if a.type.name == "DOWNLOAD"]
+    if not download_actions:
+        pytest.skip("No download actions produced (playlist empty or already downloaded?)")
+
+    first_vid = download_actions[0].item.video_id if download_actions[0].item else None
+    assert first_vid
+    # For audio mode there should be a single mp3 target for this video id.
+    subset = [a for a in download_actions if a.item and a.item.video_id == first_vid]
+    subset = [a for a in subset if (a.to_name or "").endswith(".mp3")]
+    assert subset
+
+    errors: list[str] = []
+    bus = EventBus()
+
+    async def on_failed(payload):
+        errors.append(str(payload.get("error", "")))
+
+    bus.subscribe("DownloadFailed", on_failed)
+
+    executor = ActionExecutor(db, concurrency=1, event_bus=bus)
+    import asyncio
+
+    asyncio.run(executor.execute(subset, cfg))
+
+    audio_dir = save_path / "audio"
+    assert audio_dir.exists()
+    if not any(p.suffix.lower() == ".mp3" for p in audio_dir.glob("*.mp3")):
+        _skip_if_bot_check(errors)
+        assert False

tests/test_integration_both.py

@@ -0,0 +1,84 @@
+from __future__ import annotations
+
+import os
+
+import pytest
+
+from app.core.database.db import Database
+from app.core.sync.executor import ActionExecutor
+from app.core.events.event_bus import EventBus
+from app.core.sync.service import SyncService
+
+
+PLAYLIST_URL = os.getenv("TEST_PLAYLIST_URL")
+
+
+def _require_integration():
+    if not os.getenv("INTEGRATION_TEST"):
+        pytest.skip("Set INTEGRATION_TEST=1 to enable real download tests")
+    if not PLAYLIST_URL:
+        pytest.skip("Set TEST_PLAYLIST_URL to enable real download tests")
+
+
+def _skip_if_bot_check(errors: list[str]) -> None:
+    msg = "\n".join(errors).lower()
+    if "sign in to confirm you’re not a bot" in msg or "sign in to confirm you're not a bot" in msg:
+        pytest.skip("YouTube bot-check blocked download; provide cookies to yt-dlp to run this test reliably")
+
+
+@pytest.mark.integration
+def test_integration_download_both(tmp_path):
+    _require_integration()
+    if not os.getenv("FFMPEG_PATH"):
+        pytest.skip("Set FFMPEG_PATH to a working ffmpeg binary to enable audio extraction downloads")
+
+    db_path = tmp_path / "app.db"
+    save_path = tmp_path / "downloads"
+    save_path.mkdir(parents=True, exist_ok=True)
+
+    cfg = {
+        "url": PLAYLIST_URL,
+        "download_mode": "both",
+        "save_path": str(save_path),
+        # Must be set to a real ffmpeg path for this test to pass.
+        "ffmpeg_path": os.getenv("FFMPEG_PATH"),
+        "max_download_quality": "1080p",
+    }
+
+    db = Database(db_path.resolve())
+    service = SyncService(db)
+    actions = service.sync_from_config(cfg)
+
+    download_actions = [a for a in actions if a.type.name == "DOWNLOAD"]
+    if not download_actions:
+        pytest.skip("No download actions produced (playlist empty or already downloaded?)")
+
+    first_vid = download_actions[0].item.video_id if download_actions[0].item else None
+    assert first_vid
+    subset = [a for a in download_actions if a.item and a.item.video_id == first_vid]
+
+    mp4 = [a for a in subset if (a.to_name or "").endswith(".mp4")]
+    mp3 = [a for a in subset if (a.to_name or "").endswith(".mp3")]
+    assert mp4 and mp3
+
+    errors: list[str] = []
+    bus = EventBus()
+
+    async def on_failed(payload):
+        errors.append(str(payload.get("error", "")))
+
+    bus.subscribe("DownloadFailed", on_failed)
+
+    executor = ActionExecutor(db, concurrency=1, event_bus=bus)
+    import asyncio
+
+    asyncio.run(executor.execute(mp4 + mp3, cfg))
+
+    audio_dir = save_path / "audio"
+    video_dir = save_path / "video"
+    assert audio_dir.exists() and video_dir.exists()
+    has_mp3 = any(p.suffix.lower() == ".mp3" for p in audio_dir.glob("*.mp3"))
+    has_mp4 = any(p.suffix.lower() == ".mp4" for p in video_dir.glob("*.mp4"))
+    if not (has_mp3 and has_mp4):
+        _skip_if_bot_check(errors)
+        assert False

tests/test_integration_video.py

@@ -0,0 +1,76 @@
+from __future__ import annotations
+
+import os
+
+import pytest
+
+from app.core.database.db import Database
+from app.core.sync.executor import ActionExecutor
+from app.core.events.event_bus import EventBus
+from app.core.sync.service import SyncService
+
+
+PLAYLIST_URL = os.getenv("TEST_PLAYLIST_URL")
+
+
+def _require_integration():
+    if not os.getenv("INTEGRATION_TEST"):
+        pytest.skip("Set INTEGRATION_TEST=1 to enable real download tests")
+    if not PLAYLIST_URL:
+        pytest.skip("Set TEST_PLAYLIST_URL to enable real download tests")
+
+
+def _skip_if_bot_check(errors: list[str]) -> None:
+    msg = "\n".join(errors).lower()
+    if "sign in to confirm you’re not a bot" in msg or "sign in to confirm you're not a bot" in msg:
+        pytest.skip("YouTube bot-check blocked download; provide cookies to yt-dlp to run this test reliably")
+
+
+@pytest.mark.integration
+def test_integration_download_video(tmp_path):
+    _require_integration()
+
+    db_path = tmp_path / "app.db"
+    save_path = tmp_path / "downloads"
+    save_path.mkdir(parents=True, exist_ok=True)
+
+    cfg = {
+        "url": PLAYLIST_URL,
+        "download_mode": "video",
+        "save_path": str(save_path),
+        "ffmpeg_path": os.getenv("FFMPEG_PATH"),
+        "max_download_quality": "1080p",
+    }
+
+    db = Database(db_path.resolve())
+    service = SyncService(db)
+    actions = service.sync_from_config(cfg)
+
+    download_actions = [a for a in actions if a.type.name == "DOWNLOAD"]
+    if not download_actions:
+        pytest.skip("No download actions produced (playlist empty or already downloaded?)")
+
+    first_vid = download_actions[0].item.video_id if download_actions[0].item else None
+    assert first_vid
+    subset = [a for a in download_actions if a.item and a.item.video_id == first_vid]
+    subset = [a for a in subset if (a.to_name or "").endswith(".mp4")]
+    assert subset
+
+    errors: list[str] = []
+    bus = EventBus()
+
+    async def on_failed(payload):
+        errors.append(str(payload.get("error", "")))
+
+    bus.subscribe("DownloadFailed", on_failed)
+
+    executor = ActionExecutor(db, concurrency=1, event_bus=bus)
+    import asyncio
+
+    asyncio.run(executor.execute(subset, cfg))
+
+    video_dir = save_path / "video"
+    assert video_dir.exists()
+    if not any(p.suffix.lower() == ".mp4" for p in video_dir.glob("*.mp4")):
+        _skip_if_bot_check(errors)
+        assert False

tests/test_reorder_and_delete.py

@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from app.core.models import PlaylistItem, SyncAction, SyncActionType
+from app.core.sync.executor import ActionExecutor
+from app.core.sync.reorder import safe_multi_rename
+
+
+def test_safe_multi_rename_swaps_files(tmp_path: Path):
+    a = tmp_path / "0001 - A.mp4"
+    b = tmp_path / "0002 - B.mp4"
+    a.write_text("A", encoding="utf-8")
+    b.write_text("B", encoding="utf-8")
+
+    safe_multi_rename([(a, b), (b, a)])
+
+    assert (tmp_path / "0001 - A.mp4").read_text(encoding="utf-8") == "B"
+    assert (tmp_path / "0002 - B.mp4").read_text(encoding="utf-8") == "A"
+
+
+def test_executor_deletes_to_recycle(tmp_path: Path):
+    class StubDB:
+        def clear_file_state(self, playlist_id: str, video_id: str) -> None:
+            return None
+
+    executor = ActionExecutor(StubDB())  # type: ignore[arg-type]
+
+    save_root = tmp_path / "downloads"
+    audio_root = save_root / "audio"
+    video_root = save_root / "video"
+    audio_root.mkdir(parents=True, exist_ok=True)
+    video_root.mkdir(parents=True, exist_ok=True)
+
+    victim = audio_root / "0001 - X.mp3"
+    victim.write_text("x", encoding="utf-8")
+
+    item = PlaylistItem(playlist_id="p", video_id="v", title="t", playlist_index=1, local_filename=victim.name, downloaded=True)
+    action = SyncAction(SyncActionType.DELETE, item=item, from_name=victim.name)
+
+    executor._apply_deletions([action], audio_root, video_root, {"url": "p"})  # type: ignore[attr-defined]
+
+    assert not victim.exists()
+    recycled = save_root / ".recycle" / "audio" / victim.name
+    assert recycled.exists()

tests/test_settings_default_config.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+import json
+import os
+
+from app.config.settings import Settings
+
+
+def test_settings_creates_root_config_if_missing(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+
+    cfg_path = tmp_path / "config" / "yt-playlist-config.json"
+    assert not cfg_path.exists()
+
+    settings = Settings()
+    assert settings.path == cfg_path.resolve()
+    assert cfg_path.exists()
+
+    data = json.loads(cfg_path.read_text(encoding="utf-8"))
+    assert "playlists" in data
+    assert data.get("ffmpeg_path") == ("./bin/ffmpeg.exe" if os.name == "nt" else "./bin/ffmpeg")
+    assert data["playlists"][0].get("download_mode") == "video"
+    assert data["playlists"][0].get("max_download_quality") == "1080p"
+    assert data["playlists"][0].get("save_path") == "./downloads"
+
+
+def test_settings_reads_config_from_default_location(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+
+    cfg_path = tmp_path / "config" / "yt-playlist-config.json"
+    cfg_path.parent.mkdir(parents=True, exist_ok=True)
+    cfg_path.write_text(json.dumps({"playlists": [{"url": "X"}]}), encoding="utf-8")
+
+    settings = Settings()
+    assert settings.path == cfg_path.resolve()
+    assert settings.playlists and settings.playlists[0]["url"] == "X"
+    assert settings.playlists[0]["download_mode"] == "video"
+    assert settings.playlists[0]["max_download_quality"] == "1080p"
+    assert settings.playlists[0]["save_path"] == "./downloads"

yt-playlist-main.py

@@ -1,524 +0,0 @@
-import os
-import sys
-import json
-import shutil
-import platform
-import time
-import subprocess
-from urllib.parse import urlparse, parse_qs
-from pathlib import Path
-from concurrent.futures import ThreadPoolExecutor, as_completed
-
-os.chdir(os.path.dirname(os.path.abspath(sys.argv[0])))
-if platform.system() == "Windows":
-    sys.stdout.reconfigure(encoding="utf-8") # type: ignore
-
-OK = "✔"
-FAIL = "✘"
-WARN = "⚠"
-INFO = "ℹ"
-STEP = "➜"
-
-def is_docker():
-    return os.path.exists("/.dockerenv") or os.getenv("RUNNING_IN_DOCKER") == "true"
-
-def update_yt_dlp(yt_dlp_path: str):
-    try:
-        subprocess.run(
-            [yt_dlp_path, "-U"],
-            check=True,
-            stdout=subprocess.DEVNULL,
-            stderr=subprocess.PIPE,   # capture error output
-            text=True
-        )
-        print(f"{OK} yt-dlp is up to date.")
-    except subprocess.CalledProcessError:
-        print(f"{WARN} Could not update yt-dlp: Internet unavailable or cannot reach update server")
-
-
-
-class ConfigLoader:
-    DEFAULT_CONFIG = {
-        "playlists": [
-            {
-                "url": "https://www.youtube.com/playlist?list=YOUR_PLAYLIST_ID_HERE",
-                "download_mode": "audio",  # options: audio, video, both
-                "max_video_quality": "1080p", # options: 720p, 1080p, 1440p, 2160p, best
-                "save_path": "./downloads",
-                "archive": "archive.txt"
-            }
-        ],
-        "yt_dlp_path": "yt-dlp" if is_docker() else ("./bin/yt-dlp.exe" if platform.system() == "Windows" else "./bin/yt-dlp"),
-        "ffmpeg_path": "ffmpeg" if is_docker() else ("./bin/ffmpeg.exe" if platform.system() == "Windows" else "./bin/ffmpeg"),
-        "aria2c_path": "aria2c" if is_docker() else ("./bin/aria2c.exe" if platform.system() == "Windows" else "./bin/aria2c"),
-        "max_parallel_downloads": 10,
-        "aria2c_connections": 8
-    }
-
-    def __init__(self, config_path=None):
-        config_dir = Path("./config")
-        config_dir.mkdir(parents=True, exist_ok=True)
-        if config_path is None:
-            config_path = config_dir / "yt-playlist-config.json"
-        else:
-            config_path = Path(config_path)
-            if not config_path.is_absolute():
-                config_path = config_dir / config_path
-        self.config_path = Path(config_path).resolve()
-        if not self.config_path.exists():
-            self._create_default_config()
-            print(f"{INFO} Default config created at '{self.config_path}'. Please edit it and rerun.")
-            sys.exit(0)
-
-        with self.config_path.open("r", encoding="utf-8") as f:
-            self.data = json.load(f)
-
-        # Validate binaries
-        self._check_binary(self.yt_dlp_path, "yt-dlp")
-        self._check_binary(self.aria2c_path, "aria2c")
-        # Only require ffmpeg if download_mode is audio or both
-        if self.download_mode in ("audio", "both"):
-            self._check_binary(self.ffmpeg_path, "ffmpeg")
-
-    def _create_default_config(self):
-        with self.config_path.open("w", encoding="utf-8") as f:
-            json.dump(self.DEFAULT_CONFIG, f, indent=2)
-
-    def _check_binary(self, path_str, name):
-        # If path_str looks like a system binary (no slashes), check PATH only
-        if os.sep not in path_str and '/' not in path_str:
-            if shutil.which(path_str):
-                return
-            print(
-                f"{WARN}[ERROR] {name} not found in system PATH.\n"
-                f"  Configured path: '{path_str}'\n"
-                f"Please install or correct the path in yt-playlist-config.json ."
-            )
-            sys.exit(1)
-        else:
-            path = Path(path_str)
-            if not path.is_absolute():
-                script_dir = Path(__file__).resolve().parent
-                path = (script_dir / path).resolve()
-            if path.is_file() or shutil.which(str(path)):
-                return
-            print(
-                f"{WARN}[ERROR] {name} not found.\n"
-                f"  Configured path: '{path_str}'\n"
-                f"  Resolved absolute path: '{path}'\n"
-                f"Please correct the yt-playlist-config.json path."
-            )
-            sys.exit(1)
-
-    @property
-    def playlists(self):
-        return self.data.get("playlists", [])
-
-    @property
-    def yt_dlp_path(self):
-        return self.data["yt_dlp_path"]
-
-    @property
-    def ffmpeg_path(self):
-        return self.data["ffmpeg_path"]
-
-    @property
-    def aria2c_path(self):
-        return self.data["aria2c_path"]
-
-    @property
-    def download_mode(self):
-        return self.data.get("download_mode", "audio")
-    
-    @property
-    def max_video_quality(self):
-        return self.data.get("max_video_quality", "1080p")
-
-    @property
-    def max_parallel_downloads(self):
-        return self.data.get("max_parallel_downloads", 10)
-
-    @property
-    def aria2c_connections(self):
-        return self.data.get("aria2c_connections", 8)
-
-
-class PlaylistDownloader:
-    illegal_chars = '<>:"/\\|?*'
-
-    def __init__(self, config: ConfigLoader, playlist: dict, index: int):
-
-        # Determine a friendly identifier for the playlist
-        # playlist_id = playlist.get("url") or playlist.get("save_path") or f"playlist #{index+1}"
-
-        # Check for missing or empty URL and distinguish videos vs playlists
-        self.url = playlist.get("url")
-        self.skip = False
-        if not self.url:
-            print(f"{FAIL} Playlist #{index+1} has invalid or empty URL: '{self.url}' skipping")
-            self.skip = True
-        else:
-            parsed = urlparse(self.url)
-            qs = parse_qs(parsed.query)
-            # If query contains 'list' it's a playlist URL
-            if "list" in qs and qs.get("list"):
-                self.skip = False
-            else:
-                # If URL contains a video id (v param) or is a youtu.be short link, treat as video and skip
-                if "v" in qs or parsed.netloc.endswith("youtu.be") or parsed.path.startswith("/watch"):
-                    print(f"{WARN} URL for playlist #{index+1} looks like a video URL, not a playlist: '{self.url}' — skipping")
-                    self.skip = True
-                else:
-                    # Not clearly a playlist or video — warn and attempt, but typically will fail
-                    print(f"{WARN} URL for playlist #{index+1} does not contain a playlist id: '{self.url}'. Attempting to fetch, but it may fail.")
-                    self.skip = False
-
-        # Continue with normal initialization
-        self.download_mode = playlist.get("download_mode", config.download_mode)
-        self.max_video_quality = playlist.get("max_video_quality", config.max_video_quality)
-
-        self.save_path = Path(playlist.get("save_path", "./music"))
-        self.save_path.mkdir(parents=True, exist_ok=True)
-
-        # Archive path
-        self.archive = Path(playlist.get("archive", "archive.txt"))
-        if not self.archive.is_absolute():
-            self.archive = self.save_path / self.archive
-        self.archive.touch(exist_ok=True)
-
-        self.yt_dlp = config.yt_dlp_path
-        self.ffmpeg = config.ffmpeg_path
-        self.aria2c = config.aria2c_path
-        self.max_parallel = config.max_parallel_downloads
-        self.aria2c_connections = config.aria2c_connections
-
-
-    def sanitize_title(self, title, fallback_id):
-        safe_title = title.translate(str.maketrans({c: '-' for c in self.illegal_chars})).strip()
-        return safe_title if safe_title else fallback_id
-
-    def get_file_path(self, track_index, title):
-        return self.save_path / f"{track_index:03d} - {title}.mp3"
-
-    def fetch_videos(self):
-        if getattr(self, "skip", False) or not self.url:
-            return []  # nothing to fetch
-    
-        try:
-            result = subprocess.run(
-                [self.yt_dlp, "-J", "--flat-playlist", self.url],
-                capture_output=True, text=True, check=True
-            )
-            data = json.loads(result.stdout)
-            entries = data.get("entries", [])
-        except subprocess.CalledProcessError as e:
-            stderr = (e.stderr or "").lower()
-            # Heuristics for private/unavailable playlists
-            if any(k in stderr for k in ("private", "sign in", "login required", "403", "Authorization failed")):
-                print(f"{WARN} Playlist appears to be private or requires authentication: '{self.url}'. Skipping.")
-                self.skip = True
-                return []
-            # Unknown error — print and skip
-            print(f"{FAIL} Failed to fetch playlist '{self.url}': {e.stderr.strip() if e.stderr else str(e)}")
-            self.skip = True
-            return []
-        except json.JSONDecodeError:
-            print(f"{FAIL} Failed to parse yt-dlp output for URL: '{self.url}'. Skipping.")
-            self.skip = True
-            return []
-
-        valid = []
-        for v in entries:
-            if not v:
-                continue
-            title = v.get("title", "")
-            if title in ("[Deleted video]", "[Private video]"):
-                print(f"[SKIP] {v['id']} - {title}")
-                continue
-            valid.append(v)
-        return valid
-
-    def get_archive_ids(self):
-        ids = set()
-        with self.archive.open("r", encoding="utf-8") as f:
-            for line in f:
-                parts = line.strip().split()
-                if len(parts) >= 2:
-                    ids.add(parts[1])
-        return ids
-
-    def download_video(self, video, track_index):
-        title = video.get("title", "[Unknown]")
-        safe_title = self.sanitize_title(title, video["id"])
-        video_url = f"https://www.youtube.com/watch?v={video['id']}"
-
-        def build_video_format(max_quality):
-            mapping = {
-                "720p": "bestvideo[height<=720]+bestaudio/best[height<=720]",
-                "1080p": "bestvideo[height<=1080]+bestaudio/best[height<=1080]",
-                "1440p": "bestvideo[height<=1440]+bestaudio/best[height<=1440]",
-                "2160p": "bestvideo[height<=2160]+bestaudio/best[height<=2160]",
-                "best": "bestvideo+bestaudio/best"
-            }
-            return mapping.get(max_quality.lower(), mapping["1080p"])
-
-        cmds = []
-
-        if self.download_mode == "audio":
-            output_path = self.save_path / "audio" / f"{track_index:03d} - {safe_title}.mp3"
-            output_path.parent.mkdir(parents=True, exist_ok=True)
-            args = [
-                str(self.yt_dlp),
-                "-f", "bestaudio",
-                "--extract-audio",
-                "--audio-format", "mp3",
-                "--audio-quality", "0",
-            ]
-            # Only pass --ffmpeg-location if ffmpeg is NOT available on PATH
-            if not shutil.which(str(self.ffmpeg)):
-                args += ["--ffmpeg-location", str(self.ffmpeg)]
-            args += [
-                "--download-archive", str(self.archive),
-                "-o", str(output_path),
-                "--external-downloader", str(self.aria2c),
-                "--external-downloader-args",
-                f"aria2c:-x {self.aria2c_connections} -s {self.aria2c_connections}",
-                video_url
-            ]
-            cmds.append((args, f"{track_index:03d} - {title} (audio)"))
-
-        elif self.download_mode == "video":
-            output_path = self.save_path / "video" / f"{track_index:03d} - {safe_title}.mp4"
-            output_path.parent.mkdir(parents=True, exist_ok=True)
-            fmt = build_video_format(self.max_video_quality)
-            args = [
-                str(self.yt_dlp),
-                "-f", fmt,
-                "--merge-output-format", "mp4",
-            ]
-            if not shutil.which(str(self.ffmpeg)):
-                args += ["--ffmpeg-location", str(self.ffmpeg)]
-            args += [
-                "--download-archive", str(self.archive),
-                "-o", str(output_path),
-                "--external-downloader", str(self.aria2c),
-                "--external-downloader-args",
-                f"aria2c:-x {self.aria2c_connections} -s {self.aria2c_connections}",
-                video_url
-            ]
-            cmds.append((args, f"{track_index:03d} - {title} (video)"))
-
-        elif self.download_mode == "both":
-            # Download video first into video folder
-            video_folder = self.save_path / "video"
-            video_folder.mkdir(parents=True, exist_ok=True)
-            video_output = video_folder / f"{track_index:03d} - {safe_title}.mp4"
-            fmt = build_video_format(self.max_video_quality)
-            video_args = [
-                str(self.yt_dlp),
-                "-f", fmt,
-                "--merge-output-format", "mp4",
-                "--download-archive", str(self.archive),
-                "-o", str(video_output),
-                "--external-downloader", str(self.aria2c),
-                "--external-downloader-args", f"aria2c:-x {self.aria2c_connections} -s {self.aria2c_connections}",
-                video_url,
-            ]
-            if not shutil.which(str(self.ffmpeg)):
-                # allow yt-dlp to find ffmpeg via --ffmpeg-location if configured as a path
-                video_args.insert(0, str(self.yt_dlp))
-                # if ffmpeg is an explicit path, yt-dlp will use it; we keep behavior consistent
-
-            try:
-                subprocess.run(video_args, check=True)
-            except subprocess.CalledProcessError as e:
-                err = (e.stderr or "").strip()
-                print(f"{FAIL} Video download failed: {title} — {err}")
-                return False
-
-            # extract audio with ffmpeg into audio folder
-            audio_folder = self.save_path / "audio"
-            audio_folder.mkdir(parents=True, exist_ok=True)
-            audio_output = audio_folder / f"{track_index:03d} - {safe_title}.mp3"
-            # prefer configured ffmpeg path, fallback to system ffmpeg
-            ffmpeg_exe = str(self.ffmpeg)
-            if not (shutil.which(ffmpeg_exe) or Path(ffmpeg_exe).is_file()):
-                ffmpeg_exe = shutil.which("ffmpeg") or ffmpeg_exe
-
-            if ffmpeg_exe:
-                ffmpeg_cmd = [ffmpeg_exe, "-y", "-i", str(video_output), "-vn", "-codec:a", "libmp3lame", "-q:a", "0", str(audio_output)]
-                try:
-                    subprocess.run(ffmpeg_cmd, check=True, capture_output=True, text=True)
-                except subprocess.CalledProcessError as e:
-                    print(f"{WARN} ffmpeg failed to extract audio for {title}: {(e.stderr or '').strip()}")
-            else:
-                print(f"{WARN} ffmpeg not found; audio not extracted for {title}.")
-
-            print(f"{OK} Downloaded video and extracted audio for: {track_index:03d} - {title}")
-            return True
-
-        else:
-            print(f"{FAIL} Invalid download_mode '{self.download_mode}', skipping")
-            return False
-
-        # --- execute one or both downloads ---
-        success = True
-        for args, label in cmds:
-            try:
-                subprocess.run(args, check=True)
-                print(f"{OK} Downloaded: {label}")
-            except subprocess.CalledProcessError as e:
-                err_msg = e.stderr.strip().splitlines()[-1] if e.stderr else "Unknown error"
-                print(f"{FAIL} Download failed: {label} — {err_msg}")
-                success = False
-
-        return success
-
-
-    def renumber_all_tracks(self, playlist_entries):
-        print(f"\n{STEP} Renumbering files according to playlist order")
-        temp_suffix = ".renametemp"
-
-        # --- Build mapping of safe_title → correct filename ---
-        final_map_audio = {}
-        final_map_video = {}
-
-        for idx, video in enumerate(playlist_entries, start=1):
-            title = video.get("title", "[Unknown]")
-            safe_title = self.sanitize_title(title, video["id"])
-
-            if self.download_mode in ("audio", "both"):
-                final_map_audio[safe_title] = f"{idx:03d} - {safe_title}.mp3"
-            if self.download_mode in ("video", "both"):
-                final_map_video[safe_title] = f"{idx:03d} - {safe_title}.mp4"
-
-        # --- Helper function to rename files in folder ---
-        def rename_files(folder, mapping, ext):
-            folder.mkdir(parents=True, exist_ok=True)
-            for safe_title, correct_fname in mapping.items():
-                matches = list(folder.glob(f"*{ext}"))
-                # Find matching file
-                for m in matches:
-                    if safe_title in m.name:
-                        if m.name != correct_fname:
-                            temp_path = m.with_suffix(m.suffix + temp_suffix)
-                            m.rename(temp_path)
-
-            for safe_title, correct_fname in mapping.items():
-                temp_match = list(folder.glob(f"*{ext}{temp_suffix}"))
-                for temp_path in temp_match:
-                    final_path = folder / correct_fname
-                    print(f"Renaming '{temp_path.name}' → '{final_path.name}'")
-                    temp_path.rename(final_path)
-
-        if self.download_mode in ("audio", "both"):
-            rename_files(self.save_path / "audio", final_map_audio, ".mp3")
-        if self.download_mode in ("video", "both"):
-            rename_files(self.save_path / "video", final_map_video, ".mp4")
-
-        print(f"{OK} Renumbering complete.")
-
-
-    def update(self):
-        playlist_id = self.url or self.save_path or "unknown playlist"
-        if getattr(self, "skip", False):
-            print(f"{WARN} Skipping playlist '{playlist_id}': URL missing in the config.")
-            return
-
-        print(f"{STEP} Updating playlist: {playlist_id}")
-        playlist_entries = self.fetch_videos()
-        archive_ids = self.get_archive_ids()
-        new_videos = [v for v in playlist_entries if v["id"] not in archive_ids]
-
-        if not new_videos:
-            print(f"{OK} No new items found.")
-        else:
-            print(f"{OK} Found {len(new_videos)} new item(s) to download.")
-
-            idx_map = {v["id"]: i+1 for i, v in enumerate(playlist_entries)}
-
-            with ThreadPoolExecutor(max_workers=self.max_parallel) as executor:
-                futures = [executor.submit(self.download_video, v, idx_map[v["id"]]) for v in new_videos]
-                for f in as_completed(futures):
-                    try:
-                        f.result()
-                    except subprocess.CalledProcessError as e:
-                        print(f"{FAIL} Download failed: {e}")
-
-        self.renumber_all_tracks(playlist_entries)
-        self.cleanup_removed_tracks(playlist_entries)
-
-    def cleanup_removed_tracks(self, playlist_entries):
-        print(f"{STEP} Checking for files not in the playlist")
-        valid_titles = set()
-        for video in playlist_entries:
-            title = video.get("title", "[Unknown]")
-            safe_title = self.sanitize_title(title, video["id"])
-            valid_titles.add(safe_title)
-
-        def clean_folder(folder, ext):
-            to_delete = []
-            folder.mkdir(parents=True, exist_ok=True)
-            for file in folder.glob(f"*{ext}"):
-                parts = file.name.split(" - ", 1)
-                if len(parts) == 2:
-                    safe_title_in_file = parts[1][:-len(ext)]
-                    if safe_title_in_file not in valid_titles:
-                        to_delete.append(file)
-
-            if not to_delete:
-                return
-
-            print(f"{WARN} The following files in '{folder}' are not in the playlist and will be deleted:")
-            for f in to_delete:
-                print(f"  {f.name}")
-
-            try:
-                confirm = input(f"{WARN} Delete these files? [y/N]: ").strip().lower()
-            except EOFError:
-                confirm = "n"
-
-            if confirm == "y":
-                for f in to_delete:
-                    try:
-                        f.unlink()
-                        print(f"{OK} Deleted: {f.name}")
-                    except Exception as ex:
-                        print(f"{FAIL} Failed to delete {f.name}: {ex}")
-                print(f"{OK} Cleanup complete in '{folder}'.")
-            else:
-                print(f"{OK} Cleanup aborted in '{folder}'. No files were deleted.")
-
-        if self.download_mode in ("audio", "both"):
-            clean_folder(self.save_path / "audio", ".mp3")
-        if self.download_mode in ("video", "both"):
-            clean_folder(self.save_path / "video", ".mp4")
-
-
-
-class PlaylistManager:
-    def __init__(self, config: ConfigLoader):
-        self.config = config
-        self.playlists = [
-            PlaylistDownloader(config, pl, idx)
-            for idx, pl in enumerate(config.playlists)
-        ]
-
-    def run(self):
-        total_connections = self.config.max_parallel_downloads * self.config.aria2c_connections
-        if total_connections > 100:
-            print("\033[91m"
-                  f"{WARN}[WARNING] Total connections ({self.config.max_parallel_downloads} × "
-                  f"{self.config.aria2c_connections} = {total_connections}) may overload your network! Pausing 5 seconds..."
-                  "\033[0m")
-            time.sleep(5)
-
-        for playlist in self.playlists:
-            playlist.update()
-
-
-if __name__ == "__main__":
-    cfg = ConfigLoader("yt-playlist-config.json")
-    if not is_docker(): update_yt_dlp(cfg.yt_dlp_path) #update yt-dpl executable
-    manager = PlaylistManager(cfg)
-    manager.run()

ytpl-sync-entry.py

@@ -0,0 +1,7 @@
+from __future__ import annotations
+
+from app.gui.main import main
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())