name: update yt-dlp
on:
  schedule:
    - cron: "0 10 * * *"
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write

concurrency:
  group: refresh-yt-dlp-pr
  cancel-in-progress: true

jobs:
  refresh:
    name: Update yt-dlp dependency
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Set up Python
        uses: actions/setup-python@v6
        with:
          python-version: "3.12"

      - name: Check and bump yt-dlp
        id: detect
        shell: bash
        run: |
          set -euo pipefail

          python - <<'PY' >> "$GITHUB_OUTPUT"
          from __future__ import annotations

          import json
          import re
          from pathlib import Path
          from urllib.request import urlopen

          def version_tuple(text: str) -> tuple[int, ...]:
              parts = re.findall(r"\d+", text)
              return tuple(int(p) for p in parts)

          pyproject = Path("pyproject.toml")
          text = pyproject.read_text(encoding="utf-8")

          dep_match = re.search(r'^\s*"yt-dlp>=(?P<version>[^"]+)"\s*,?\s*$', text, re.MULTILINE)
          if not dep_match:
              raise SystemExit("Could not find yt-dlp dependency in pyproject.toml")

          dep_version = dep_match.group("version")

          latest_payload = urlopen("https://pypi.org/pypi/yt-dlp/json", timeout=30)
          latest_version = json.load(latest_payload)["info"]["version"]

          needs_update = version_tuple(latest_version) > version_tuple(dep_version)

          print(f"needs_update={'true' if needs_update else 'false'}")
          print(f"latest_yt_dlp={latest_version}")
          print(f"current_yt_dlp={dep_version}")

          if needs_update:
              text = re.sub(
                  r'(^\s*"yt-dlp>=)[^"]+(")',
                  rf'\g<1>{latest_version}\2',
                  text,
                  flags=re.MULTILINE,
              )
              pyproject.write_text(text, encoding="utf-8")
          PY

      - name: Create or update pull request
        if: steps.detect.outputs.needs_update == 'true'
        uses: peter-evans/create-pull-request@v8
        with:
          # Use a non-GITHUB_TOKEN credential so the resulting PR triggers CI workflows.
          # Configure secrets.PR_WORKFLOW_TOKEN with contents:write and pull-requests:write.
          token: ${{ secrets.PR_WORKFLOW_TOKEN || github.token }}
          branch: chore/refresh-yt-dlp
          commit-message: "chore: bump yt-dlp to ${{ steps.detect.outputs.latest_yt_dlp }}"
          title: "chore: bump yt-dlp to ${{ steps.detect.outputs.latest_yt_dlp }}"
          body: |
            Automated yt-dlp dependency refresh.

            - Current version: `${{ steps.detect.outputs.current_yt_dlp }}`
            - Latest version: `${{ steps.detect.outputs.latest_yt_dlp }}`
          labels: deps
          delete-branch: false
          add-paths: |
            pyproject.toml