fix

establish config defaults
refactor: remove docker related files;
2026-07-04 04:53:58 +03:00 · 2026-05-16 16:32:28 +03:00 · 2026-05-16 16:22:24 +03:00 · 2026-05-16 16:20:37 +03:00 · 2026-05-16 16:14:57 +03:00 · 2026-05-16 16:13:50 +03:00
46 changed files with 2872 additions and 1239 deletions
@@ -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"
@@ -0,0 +1,262 @@
+name: Build Release V2
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Release tag (e.g., v0.1.0)"
+        required: true
+        default: "v0.1.0"
+        type: string
+
+permissions:
+  contents: write
+  packages: write
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.11'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install pytest
+      - name: Run tests
+        env:
+          PYTHONPATH: ${{ github.workspace }}
+        run: pytest
+
+  build:
+    needs: test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: windows
+            os: windows-latest
+            artifact_name: windows-release
+          - platform: linux
+            os: ubuntu-latest
+            artifact_name: linux-release
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Get version
+        id: version
+        shell: bash
+        run: |
+          TAG="${{ github.event.inputs.tag || inputs.tag }}"
+          VERSION="${TAG#v}"
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+
+      # --- WINDOWS BUILD ---
+      - name: Build Windows Package
+        if: matrix.platform == 'windows'
+        shell: pwsh
+        run: |
+          $VERSION = "${{ steps.version.outputs.version }}"
+          $WORKSPACE = "${{ github.workspace }}"
+          New-Item -ItemType Directory -Force -Path "$WORKSPACE/dist/windows/bin"
+          
+          # yt-dlp
+          Invoke-WebRequest -Uri "https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp.exe" -OutFile "$WORKSPACE/dist/windows/bin/yt-dlp.exe"
+          
+          # FFmpeg
+          Invoke-WebRequest -Uri "https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-essentials.zip" -OutFile "$WORKSPACE/dist/windows/ffmpeg.zip"
+          Expand-Archive "$WORKSPACE/dist/windows/ffmpeg.zip" -DestinationPath "$WORKSPACE/dist/windows/ffmpeg_temp"
+          $ffmpegExe = Get-ChildItem -Path "$WORKSPACE/dist/windows/ffmpeg_temp" -Filter "ffmpeg.exe" -Recurse | Select-Object -First 1
+          Move-Item $ffmpegExe.FullName "$WORKSPACE/dist/windows/bin/ffmpeg.exe"
+          
+          # aria2c (Windows Portable)
+          Invoke-WebRequest -Uri "https://github.com/aria2/aria2/releases/download/release-1.37.0/aria2-1.37.0-win-64bit-build1.zip" -OutFile "$WORKSPACE/dist/windows/aria2c.zip"
+          Expand-Archive "$WORKSPACE/dist/windows/aria2c.zip" -DestinationPath "$WORKSPACE/dist/windows/aria2_temp"
+          Move-Item "$WORKSPACE/dist/windows/aria2_temp/aria2-1.37.0-win-64bit-build1/aria2c.exe" "$WORKSPACE/dist/windows/bin/aria2c.exe"
+          
+          # Build .exe using PyInstaller
+          # Use --add-data to include the src folder so internal imports (like 'import cli') work
+          pip install pyinstaller
+          pyinstaller --onefile --name "yt-playlist-downloader" --workpath "$WORKSPACE/build" --specpath "$WORKSPACE" --distpath "$WORKSPACE/dist" --add-data "$WORKSPACE/src;src" "$WORKSPACE/yt-playlist-main.py"
+          Move-Item "$WORKSPACE/dist/yt-playlist-downloader.exe" "$WORKSPACE/dist/windows/yt-playlist-downloader.exe"
+
+          # Cleanup & Archive
+          Remove-Item -Recurse -Force "$WORKSPACE/dist/windows/ffmpeg_temp", "$WORKSPACE/dist/windows/aria2_temp", "$WORKSPACE/dist/windows/*.zip"
+          Compress-Archive -Path "$WORKSPACE/dist/windows/*" -DestinationPath "$WORKSPACE/yt-playlist-windows-$VERSION.zip"
+
+      # --- LINUX BUILD ---
+      - name: Build Linux Package
+        if: matrix.platform == 'linux'
+        run: |
+          VERSION="${{ steps.version.outputs.version }}"
+          mkdir -p "$GITHUB_WORKSPACE/dist/linux/bin"
+          cp "$GITHUB_WORKSPACE/yt-playlist-main.py" "$GITHUB_WORKSPACE/dist/linux/"
+          cp -r "$GITHUB_WORKSPACE/src" "$GITHUB_WORKSPACE/dist/linux/"
+          
+          # yt-dlp
+          curl -L https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp_linux -o "$GITHUB_WORKSPACE/dist/linux/bin/yt-dlp"
+          chmod +x "$GITHUB_WORKSPACE/dist/linux/bin/yt-dlp"
+
+          # FFmpeg (static)
+          curl -L https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz -o "$GITHUB_WORKSPACE/ffmpeg.tar.xz"
+          mkdir -p "$GITHUB_WORKSPACE/ffmpeg_temp"
+          tar -xf "$GITHUB_WORKSPACE/ffmpeg.tar.xz" -C "$GITHUB_WORKSPACE/ffmpeg_temp" --strip-components=1
+          mv "$GITHUB_WORKSPACE/ffmpeg_temp/ffmpeg" "$GITHUB_WORKSPACE/dist/linux/bin/"
+          chmod +x "$GITHUB_WORKSPACE/dist/linux/bin/ffmpeg"
+
+      - name: Cache aria2c binary (Linux)
+        if: matrix.platform == 'linux'
+        id: aria2-cache
+        uses: actions/cache@v5
+        with:
+          path: ${{ github.workspace }}/dist/linux/bin/aria2c
+          key: aria2c-linux-1.37.0
+
+      - name: Build aria2c (Linux)
+        if: matrix.platform == 'linux' && steps.aria2-cache.outputs.cache-hit != 'true'
+        run: |
+          set -e
+          sudo apt update && sudo apt install -y build-essential pkg-config libssl-dev zlib1g-dev wget
+          
+          mkdir -p "$GITHUB_WORKSPACE/dist/linux/bin"
+          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"
+          
+          cd "$GITHUB_WORKSPACE"
+          rm -rf aria2-1.37.0 aria2-1.37.0.tar.gz
+
+      - name: Archive Linux Package
+        if: matrix.platform == 'linux'
+        run: |
+          VERSION="${{ steps.version.outputs.version }}"
+          # Archive
+          cd "$GITHUB_WORKSPACE/dist/linux" && tar -czf "$GITHUB_WORKSPACE/yt-playlist-linux-$VERSION.tar.gz" *
+
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v7
+        with:
+          name: ${{ matrix.artifact_name }}
+          path: |
+            ${{ github.workspace }}/*.zip
+            ${{ github.workspace }}/*.tar.gz
+
+  docker:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      
+      - name: Get version
+        id: version
+        shell: bash
+        run: |
+          TAG="${{ github.event.inputs.tag || inputs.tag }}"
+          VERSION="${TAG#v}"
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+
+      - name: Download Linux Artifact
+        uses: actions/download-artifact@v8
+        with:
+          name: linux-release
+          path: ${{ github.workspace }}/dist/linux-docker
+
+      - name: Prepare Docker build context
+        run: |
+          cd "$GITHUB_WORKSPACE/dist/linux-docker"
+          # Extract Linux artifact which now contains bin/, src/, and yt-playlist-main.py
+          tar -xzf "$GITHUB_WORKSPACE/dist/linux-docker/yt-playlist-linux-${{ steps.version.outputs.version }}.tar.gz"
+          
+          # Copy Docker-specific files
+          cp "$GITHUB_WORKSPACE/Dockerfile" .
+          cp "$GITHUB_WORKSPACE/docker-entrypoint.sh" .
+          
+          # Ensure config directory is present (not included in Linux zip by default)
+          if [ ! -d "config" ]; then cp -r "$GITHUB_WORKSPACE/config" . ; fi
+          
+          # Debug: List context to verify paths match Dockerfile expectations
+          ls -R
+
+      - name: Set docker image names
+        run: |
+          VERSION="${{ steps.version.outputs.version }}"
+          echo "RELEASE_IMAGE=ghcr.io/${GITHUB_ACTOR}/ytplst:${VERSION}" >> $GITHUB_ENV
+          echo "LATEST_IMAGE=ghcr.io/${GITHUB_ACTOR}/ytplst:latest" >> $GITHUB_ENV
+
+      - name: Build Docker image
+        run: |
+          docker build . -t $RELEASE_IMAGE -t $LATEST_IMAGE
+        working-directory: ${{ github.workspace }}/dist/linux-docker
+
+      - name: Save Docker images
+        run: |
+          docker save -o docker-image.tar $RELEASE_IMAGE
+          docker save -o docker-image-latest.tar $LATEST_IMAGE
+        working-directory: ${{ github.workspace }}/dist/linux-docker
+
+      - name: Upload Docker artifacts
+        uses: actions/upload-artifact@v7
+        with:
+          name: docker-images
+          path: ${{ github.workspace }}/dist/linux-docker/docker-image*.tar
+
+  release:
+    needs: [build, docker]
+    runs-on: ubuntu-latest
+    if: startsWith(github.event.inputs.tag, 'v')
+    steps:
+      - name: Download all artifacts
+        uses: actions/download-artifact@v8
+        with:
+          path: ${{ github.workspace }}/artifacts
+
+      - name: Get version
+        id: version
+        shell: bash
+        run: |
+          TAG="${{ github.event.inputs.tag || inputs.tag }}"
+          VERSION="${TAG#v}"
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v4
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Push Docker images
+        run: |
+          docker load -i "${{ github.workspace }}/artifacts/docker-images/docker-image.tar"
+          docker push ghcr.io/${GITHUB_ACTOR}/ytplst:${{ steps.version.outputs.version }}
+          docker load -i "${{ github.workspace }}/artifacts/docker-images/docker-image-latest.tar"
+          docker push ghcr.io/${GITHUB_ACTOR}/ytplst:latest
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v3
+        with:
+          tag_name: ${{ github.event.inputs.tag }}
+          draft: true
+          files: |
+            ${{ github.workspace }}/artifacts/**/*.zip
+            ${{ github.workspace }}/artifacts/**/*.tar.gz
@@ -0,0 +1,64 @@
+name: dependency-updates
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 12 * * 1"
+
+permissions:
+  contents: write
+  pull-requests: write
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  update-bundled-binaries:
+    name: Refresh pinned build dependencies
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Discover latest aria2 release
+        id: aria2
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          latest_version="$(
+            git ls-remote --tags --refs https://github.com/aria2/aria2.git 'refs/tags/release-*' \
+              | awk -F/ '{print $NF}' \
+              | sed 's/^release-//' \
+              | sort -V \
+              | tail -n 1
+          )"
+
+          if [ -z "$latest_version" ]; then
+            echo "Unable to determine the latest aria2 release." >&2
+            exit 1
+          fi
+
+          echo "version=$latest_version" >> "$GITHUB_OUTPUT"
+
+      - name: Update release workflow pins
+        shell: bash
+        env:
+          ARIA2_VERSION: ${{ steps.aria2.outputs.version }}
+        run: |
+          set -euo pipefail
+          python3 -c 'from pathlib import Path; import os; path = Path(".github/workflows/build_v2.yml"); text = path.read_text(encoding="utf-8"); version = os.environ["ARIA2_VERSION"]; updated = text.replace("release-1.37.0", f"release-{version}").replace("aria2-1.37.0", f"aria2-{version}").replace("aria2c-linux-1.37.0", f"aria2c-linux-{version}"); path.write_text(updated, encoding="utf-8") if updated != text else None; print(f"Updated aria2 references to {version}." if updated != text else "No aria2 references changed.")'
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v8
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: "chore: refresh aria2 build pins"
+          title: "Refresh aria2 build pins"
+          body: |
+            Automated maintenance update for the bundled aria2 release references used by the release workflow.
+          branch: dependency-updates/aria2
+          delete-branch: true
+          labels: dependencies, maintenance
@@ -0,0 +1,46 @@
+name: Integration tests (minimal)
+
+on:
+  workflow_dispatch:
+  #push:
+    #branches: [ main, Next ]
+  #pull_request:
+    #branches: [ main, Next ]
+
+jobs:
+  integration:
+    name: Run integration tests
+    runs-on: ubuntu-latest
+    env:
+      INTEGRATION_TEST: '1'
+      TEST_PLAYLIST_URL: 'https://www.youtube.com/playlist?list=PLUmRr21IDW9WCW87FnbWAbIwwZHbf-lAz'
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Make bundled linux binaries executable (if present)
+        run: |
+          set -euo pipefail
+          if [ -d ./bin/linux ]; then
+            chmod +x ./bin/linux/* || true
+            ls -l ./bin/linux || true
+          fi
+
+      - name: Create venv and install project
+        run: |
+          set -euo pipefail
+          python3 -m venv .venv
+          . .venv/bin/activate
+          python -m pip install --upgrade pip
+          # Install project in editable mode. If the 'test' extra exists, prefer it.
+          python -m pip install -e .[test] || python -m pip install -e .
+          python -m pip install pytest
+
+      - name: Run integration script directly
+        env:
+          YTPL_DEBUG: '1'
+        run: |
+          set -euo pipefail
+          . .venv/bin/activate
+          python tests/integration_full_workflow_test.py
@@ -0,0 +1,18 @@
+name: Lint Python code
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Install Ruff
+        run: pip install ruff
+
+      - name: Run linter
+        run: ruff check .
@@ -1,341 +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}/youtubeplaylistdownloader:${{ steps.version.outputs.version }}" >> $GITHUB_ENV
-          echo "LATEST_IMAGE=ghcr.io/${GITHUB_ACTOR}/youtubeplaylistdownloader: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 $LATEST_IMAGE
-
-      - name: Upload docker-image-latest artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: docker-image-latest
-          path: docker-image-latest.tar
-
-  release:
-    runs-on: ubuntu-latest
-    needs: [build-windows-package, build-linux-package, build-docker-image]
-    env:
-      IMAGE_NAME: youtubeplaylistdownloader
-    steps:
-      - uses: actions/download-artifact@v4
-        with:
-          name: windows-release
-          path: windows-release
-      - uses: actions/download-artifact@v4
-        with:
-          name: linux-release
-          path: linux-release
-      - uses: actions/download-artifact@v4
-        with:
-          name: docker-image
-          path: docker-image
-      - uses: actions/download-artifact@v4
-        with:
-          name: docker-image-latest
-          path: docker-image-latest
-
-      - name: Get version from tag
-        id: version
-        shell: bash
-        run: |
-          if [ "${{ 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}/youtubeplaylistdownloader:${{ steps.version.outputs.version }}" >> $GITHUB_ENV
-          echo "LATEST_IMAGE=ghcr.io/${GITHUB_ACTOR}/youtubeplaylistdownloader: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: ${{ 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
-      - name: Upload Docker release tar
-        uses: actions/upload-release-asset@v1
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          upload_url: ${{ steps.create_release.outputs.upload_url }}
-          asset_path: docker-image/docker-image.tar
-          asset_name: docker-image-${{ steps.version.outputs.version }}.tar
-          asset_content_type: application/x-tar
-      - name: Upload Docker latest tar
-        uses: actions/upload-release-asset@v1
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          upload_url: ${{ steps.create_release.outputs.upload_url }}
-          asset_path: docker-image-latest/docker-image-latest.tar
-          asset_name: docker-image-latest.tar
-          asset_content_type: application/x-tar
@@ -0,0 +1,41 @@
+name: Unit tests
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+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: Create venv and install project
+        run: |
+          set -euo pipefail
+          python3 -m venv .venv
+          . .venv/bin/activate
+          python -m pip install --upgrade pip
+          # Install project (editable) and test deps
+          python -m pip install -e .[test] || python -m pip install -e .
+          python -m pip install pytest
+
+      - name: Run tests
+        env:
+          PYTHONPATH: ${{ github.workspace }}
+        run: |
+          set -euo pipefail
+          . .venv/bin/activate
+          pytest -q
@@ -2,9 +2,13 @@


 #Custom for this project
-yt-playlist-config.json
-/bin/
-/config/
+config/yt-playlist-config.json
+/tmp*
+/*/tmp*
+*.code-workspace
+/bin/*
+/app/data
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]
@@ -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": []
+}
@@ -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"]
@@ -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.
-
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-
-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.
-
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-
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-
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-
-12. No Surrender of Others' Freedom.
-If conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot convey a covered work so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not convey it at all. For example, if you agree to terms that obligate you to collect a royalty for further conveying from those to whom you convey the Program, the only way you could satisfy both those terms and this License would be to refrain entirely from conveying the Program.
-
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-
-14. Revised Versions of this License.
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-
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-17. Interpretation of Sections 15 and 16.
-If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee.
-
-END OF TERMS AND CONDITIONS
-
-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>.
@@ -1,169 +1,95 @@
-# 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.
+[![Build Release](https://github.com/darkzoul5/YoutubePlaylistDownloader/actions/workflows/build_v2.yml/badge.svg)](https://github.com/darkzoul5/YoutubePlaylistDownloader/actions/workflows/build_v2.yml)
+[![Unit tests](https://github.com/darkzoul5/YoutubePlaylistDownloader/actions/workflows/unit-tests.yml/badge.svg?branch=main)](https://github.com/darkzoul5/YoutubePlaylistDownloader/actions/workflows/unit-tests.yml)
+
+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.
-
---
+- 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; DB updates on rename/download/delete; `last_sync`
+- Optional event publishing for future GUI/logs

 ## Requirements

- Python 3.8+
+- Python 3.10+
+- `ffmpeg` (needed for `audio` and `both` modes)

---
+Quick start:

-## Installation
+Download the latest release from [releases](https://github.com/darkzoul5/YoutubePlaylistSyncThing/releases) page

-### Quick Start
+## Configure

-1. **Download the latest release:**
+On first run, the app will auto-create a default `config/yt-playlist-config.json` (if missing).

- 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:
+Create/edit `config/yt-playlist-config.json`:

 ```json
 {
+  "ffmpeg_path": "./bin/ffmpeg.exe",
  "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"
    }
-  ],
-  "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.
+Defaults:
+- `ffmpeg_path`: `./bin/ffmpeg.exe` (Windows) or `./bin/ffmpeg` (Linux)
+- `download_mode`: `video`
+- `max_download_quality`: `1080p`
+- `save_path`: `./downloads`

---
+`max_download_quality`:

-### Running
+- Limits yt-dlp download quality (e.g. `"1080p"`, `"720p"`, `"360p"`). This only affects the downloaded video format selection.
+- If the requested max quality isn't available for a video, the best available quality is chosen.

- Just run the script with Python:
-  - On Windows: `python yt-playlist-main.py`
-  - On Linux: `python3 yt-playlist-main.py`
+`download_mode`:

- 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
+- `video`: download playlist videos as muxed `.mp4` (no ffmpeg processing)
+- `audio`: download muxed `.mp4`, extract `.mp3`, delete the `.mp4`
+- `both`: download muxed `.mp4`, extract `.mp3`, keep both files

---
+## Run

-## Docker Usage
+- Compute-only:

-You can run YouTube Playlist Downloader using the official Docker image.
-
-### Run the container
-
-```pwsh
-docker run -v /path/to/downloads:/app/downloads -v /path/to/config:/app/config ghcr.io/dark_zoul/YoutubePlaylistDownloader:latest
+```bash
+python -m src.app.cli
 ```

-Replace `/path/to/downloads` and `/path/to/config` with your local directories.
+- Apply actions:

-**Required volumes:**
-
- `/app/downloads`: Directory for downloaded audio/videos
- `/app/config`: Directory for the configuration file
-
-### 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/YoutubePlaylistDownloader:latest
-    container_name: yt-downloader
-    restart: no
-    volumes:
-      - /path/to/downloads:/app/downloads
-      - /path/to/config:/app/config
+```bash
+python -m src.app.cli --apply
 ```

-Run it with:
+- Single playlist (0-based index):

-```pwsh
-docker compose up -d
+```bash
+python -m src.app.cli --apply --playlist 0
 ```

-## Troubleshooting
+## Data & Layout

- **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.
+- Database: `app/data/app.db`
+- Outputs: `<save_path>/audio` and/or `<save_path>/video`
+- Recycle bin: `<save_path>/.recycle/{audio,video}`

---
+## Roadmap (short)

-## 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
+- GUI (PySide6) wired to EventBus
+- Enhanced config validation
@@ -0,0 +1,11 @@
+{
+  "ffmpeg_path": "./bin/ffmpeg.exe",
+  "playlists": [
+    {
+      "url": "https://www.youtube.com/playlist?list=YOUR_PLAYLIST_ID_HERE",
+      "download_mode": "video",
+      "max_download_quality": "1080p",
+      "save_path": "./downloads"
+    }
+  ]
+}
@@ -0,0 +1,38 @@
+# GUI Plan
+
+## Python-first Desktop Architecture
+
+- **Primary GUI framework**: `PySide6` (Qt for Python).
+- **Communication Layer**: A local `FastAPI` backend to separate core logic from the UI.
+- **IPC Mechanism**: The GUI spawns the FastAPI server on a random high port (binding to `127.0.0.1` ONLY) and communicates via REST/WebSockets.
+
+## 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, aria2c), max parallel jobs, and Docker detection toggle.
+
+## Phase 1 Roadmap: "The Bridge"
+
+- [ ] **Refactor `src/manager.py`**: Convert CLI-first execution to async-compatible methods for FastAPI consumption.
+- [ ] **FastAPI Integration**: Create endpoints for `/playlists`, `/status`, and `/download/start`.
+- [ ] **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. The GUI should spawn the local API process (background subprocess) on startup.
+- 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.
+- Security: bind the local API to `localhost` only, use a short-lived token or IPC for authentication between GUI and backend, and avoid exposing unnecessary ports.
+
+## Roadmap (GUI → Web → Mobile)
+
+1. Desktop prototype: `FastAPI` backend + `PySide6` GUI (thin client) with basic playlist add/update/download controls and status streaming.
+2. Packaging: create Windows exe/installer and Linux AppImage for the prototype.
+3. Web frontend: build a web SPA that consumes the same backend API (hosted or local) — this reuses business logic with minimal change.
+4. Android: either a native app or cross-platform UI (Flutter/React Native) that calls the backend API; alternatively host the backend and make a thin mobile client.
+
+If you want, I can now: scaffold a minimal `FastAPI` backend and `PySide6` desktop starter in this repo, or produce concise packaging steps for Windows and Linux. Which do you prefer?
@@ -0,0 +1,50 @@
+# Project Plan
+
+## Subject Area
+
+- Tool for downloading and synchronizing 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 download a large number of videos or audio files from a YouTube playlist and keep it updated
+
+## 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
+- Docker
+- Possible Future: Web App, Android App (via shared FastAPI backend)
+
+## Architecture & Languages
+
+- Core Engine: Python (yt-dlp wrapper)
+- Backend API: FastAPI (Local localhost-only boundary)
+- Desktop Frontend: PySide6 (Qt for Python)
+- Distribution: PyInstaller / Briefcase (Windows .exe, Linux AppImage)
+  
@@ -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
@@ -0,0 +1,781 @@
+# YouTube Playlist Sync — Project Conversion Plan
+
+Repository:
+
+- [darkzoul5/YoutubePlaylistDownloader](https://github.com/darkzoul5/YoutubePlaylistDownloader?utm_source=chatgpt.com)
+
+---
+
+# 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
@@ -0,0 +1,38 @@
+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "ytplst"
+version = "1.1.1"
+description = "YouTube playlist Sync Thing"
+readme = "README.md"
+authors = [ { name = "Dark_Zoul" } ]
+license = { file = "LICENSE" }
+keywords = ["youtube", "yt-dlp", "playlist", "sync"]
+requires-python = ">=3.10"
+dependencies = [
+	"yt-dlp>=2026.3.17",
+]
+[project.optional-dependencies]
+gui = [
+    "PySide6"
+]
+dev = [
+    "pytest",
+    "ruff",
+    "black"
+]
+
+[project.urls]
+Home = "https://github.com/darkzoul5/YoutubePlaylistSyncThing"
+
+[project.scripts]
+ytplst = "ytplst.main:main"
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+
+[tool.setuptools.packages.find]
+where = ["src"]
+include = ["ytplst*"]
@@ -0,0 +1,5 @@
+[pytest]
+testpaths = tests
+# Collect all standardized tests using the conventional pattern
+python_files = test_*.py
+addopts = -q
@@ -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",
+]
@@ -0,0 +1,104 @@
+from __future__ import annotations
+
+import argparse
+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.events.event_bus import EventBus
+import re
+from .core.utils.yt import extract_playlist_id
+from .core.utils.deps import DependencyError
+
+
+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("app/data/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)")
+    args = parser.parse_args(argv)
+
+    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):
+        pid = payload.get("playlist_id")
+        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}")
+        if args.apply and actions:
+            try:
+                asyncio.run(executor.execute(actions, pl))
+            except DependencyError as e:
+                print(f"ERROR: {e}")
+                return 2
+            db.set_playlist_last_sync(pid)
+            print(f"Applied actions for {pid}.")
+
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
@@ -0,0 +1 @@
+"""Config loader for the new backend (separate from legacy)."""
@@ -0,0 +1,75 @@
+from __future__ import annotations
+
+import json
+import os
+from pathlib import Path
+from typing import Any, Dict, List, Optional
+
+
+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(),
+}
+
+
+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"]),
+        }
+
+        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
@@ -0,0 +1,10 @@
+"""Core backend modules (scanner, sync, download, db, scheduler, events)."""
+
+__all__ = [
+    "scanner",
+    "sync",
+    "download",
+    "database",
+    "scheduler",
+    "events",
+]
@@ -0,0 +1 @@
+"""Database helpers (SQLite)."""
@@ -0,0 +1,101 @@
+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:
+    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:
+        with self._conn:
+            self._conn.executescript(SCHEMA)
+
+    def upsert_playlist_items(self, rows: Iterable[tuple]):
+        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]:
+        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:
+        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:
+        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:
+        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:
+        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:
+        with self._conn:
+            self._conn.execute(
+                "UPDATE playlists SET last_sync = datetime('now') WHERE id = ?",
+                (playlist_id,),
+            )
@@ -0,0 +1,133 @@
+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:
+            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
+
+            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(),
+            }
+
+            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)
@@ -0,0 +1,61 @@
+from __future__ import annotations
+
+import asyncio
+from dataclasses import dataclass
+from enum import Enum
+from pathlib import Path
+from typing import 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
+    audio_output_path: Optional[Path] = None  # when mode=video and we also want mp3
+    keep_video: bool = True
+
+
+class QueueManager:
+    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):
+        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):
+        self._stopped.set()
+        for w in self._workers:
+            w.cancel()
+        self._workers.clear()
+
+    async def enqueue(self, job: DownloadJob):
+        await self._queue.put(job)
@@ -0,0 +1,17 @@
+from __future__ import annotations
+
+import asyncio
+from .downloader import Downloader
+from .queue_manager import DownloadJob, JobState
+
+
+async def default_worker(job: DownloadJob, *, max_retries: int = 2, delay_seconds: float = 1.5):
+    dl = Downloader(ffmpeg_path=job.ffmpeg_path)
+    attempt = 0
+    while attempt <= max_retries:
+        await dl.handle_job(job)
+        if job.state == JobState.COMPLETED:
+            return
+        attempt += 1
+        if attempt <= max_retries:
+            await asyncio.sleep(delay_seconds)
@@ -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)
@@ -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
@@ -0,0 +1,54 @@
+from __future__ import annotations
+
+from typing import List
+
+from ..models import PlaylistItem
+
+
+class PlaylistScanner:
+    """
+    Fetches remote playlist entries using yt-dlp (no downloads).
+
+    This class intentionally avoids strict dependencies at import time. If
+    yt_dlp is unavailable, call sites should handle the raised ImportError.
+    """
+
+    def __init__(self) -> None:
+        pass
+
+    def scan(self, playlist_url: str, playlist_id: str) -> List[PlaylistItem]:
+        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,
+        }
+
+        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
@@ -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.
@@ -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/REORDER
+    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
@@ -0,0 +1,246 @@
+from __future__ import annotations
+
+import asyncio
+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
+
+
+class ActionExecutor:
+    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) -> None:
+        self._preflight_dependencies(actions, 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
+        await self._apply_renames(actions, audio_root, video_root, playlist_cfg)
+
+        # Then, recycle deletions
+        self._apply_deletions(actions, audio_root, video_root, playlist_cfg)
+
+        # Finally, perform downloads concurrently
+        await self._apply_downloads(actions, mode, audio_root, video_root, playlist_cfg)
+
+    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:
+        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:
+        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) -> None:
+        playlist_id = extract_playlist_id(playlist_cfg.get("url", "")) or playlist_cfg.get("url", "")
+        queue = QueueManager(concurrency=self.concurrency)
+
+        async def worker(job: DownloadJob):
+            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)
+
+        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 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:
+            await queue._queue.join()  # wait for all jobs
+            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:
+                            await self.bus.publish("DownloadFailed", {"playlist_id": playlist_id, "video_id": job.item.video_id, "error": job.error or "unknown"})
+                except Exception:
+                    pass
@@ -0,0 +1,17 @@
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Iterable, 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
@@ -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)
@@ -0,0 +1,137 @@
+from __future__ import annotations
+
+from dataclasses import asdict
+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 make_filename, sanitize_title
+from ..utils.yt import extract_playlist_id
+
+
+class SyncService:
+    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 [".mp3"]
+
+    def sync_from_config(self, playlist_cfg: dict) -> List[SyncAction]:
+        url: str = playlist_cfg.get("url")
+        mode: str = playlist_cfg.get("download_mode", "audio")
+        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),
+        )
+        items = self.scanner.scan(url, playlist_id)
+
+        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
+        for ext in exts:
+            mode_dir = "audio" if ext == ".mp3" else "video"
+            fs_root = (save_path / mode_dir)
+            fs_entries = list_files(fs_root, [ext])
+            actions = self.diff.compute_actions(sanitized, db_index, fs_entries, ext)
+            merged_actions.extend(actions)
+
+        return [
+            {
+                "type": a.type,
+                "video_id": a.item.video_id if a.item else None,
+                "from_name": a.from_name,
+                "to_name": a.to_name,
+            }
+            for a in merged_actions
+        ]
@@ -0,0 +1 @@
+"""Utility helpers for naming, parsing, etc."""
@@ -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
@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+
+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}"
@@ -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
@@ -0,0 +1,57 @@
+from __future__ import annotations
+
+"""
+Entry point for the new backend (no GUI). For now, this only verifies
+that configuration and database setup work. Future iterations will wire
+up scanner, diff engine, queue, and scheduler.
+"""
+
+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.models import SyncActionType
+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("app/data/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
+                import asyncio
+                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()
@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+from src.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
+
@@ -0,0 +1,40 @@
+from __future__ import annotations
+
+import json
+import os
+from pathlib import Path
+
+from src.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"
@@ -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()
				`@@ -0,0 +1 @@`
				`"""Config loader for the new backend (separate from legacy)."""`
				`@@ -0,0 +1 @@`
				`"""Utility helpers for naming, parsing, etc."""`