name: Update yt-dlp

on:
  schedule:
    - cron: '0 6 * * 1'  # Every Monday at 06:00 UTC
  workflow_dispatch:

jobs:
  update:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write

    steps:
      - uses: actions/checkout@v4

      - uses: DeterminateSystems/nix-installer-action@main

      - uses: DeterminateSystems/magic-nix-cache-action@main

      - name: Get current yt-dlp version
        id: before
        run: |
          rev=$(jq -r '.nodes.nixpkgs.locked.rev' flake.lock)
          version=$(nix eval --raw "github:nixos/nixpkgs/${rev}#yt-dlp.version")
          echo "version=${version}" >> "$GITHUB_OUTPUT"

      - name: Update nixpkgs
        run: nix flake update nixpkgs

      - name: Get new yt-dlp version
        id: after
        run: |
          rev=$(jq -r '.nodes.nixpkgs.locked.rev' flake.lock)
          version=$(nix eval --raw "github:nixos/nixpkgs/${rev}#yt-dlp.version")
          echo "version=${version}" >> "$GITHUB_OUTPUT"

      - name: Open PR if yt-dlp was updated
        if: steps.before.outputs.version != steps.after.outputs.version
        uses: peter-evans/create-pull-request@v6
        with:
          branch: auto/yt-dlp-update
          delete-branch: true
          commit-message: "chore: yt-dlp ${{ steps.before.outputs.version }} → ${{ steps.after.outputs.version }}"
          title: "chore: yt-dlp ${{ steps.before.outputs.version }} → ${{ steps.after.outputs.version }}"
          body: |
            Automated `flake.lock` update. yt-dlp bumped from `${{ steps.before.outputs.version }}` to `${{ steps.after.outputs.version }}`.

            Triggered by the weekly nixpkgs check.
          labels: dependencies