name: Update .app-headers in /misc

on:
  pull_request:
    types:
      - closed
    branches:
      - main
    # Stellen sicher, dass nur gemergte PRs den Workflow auslösen
    # Triggern nur wenn der PR gemerged wurde
    if: github.event.pull_request.merged == true
  schedule:
    - cron: "59 23 * * *"  # Führen den Workflow täglich um 23:59 UTC aus
  workflow_dispatch:

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

    steps:
      # Step 1: Checkout repository
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Fetch all branches for full context

      # Step 2: Set up Git user
      - name: Configure Git user
        run: |
          git config --global user.name "GitHub Actions"
          git config --global user.email "actions@github.com"

      # Step 3: Check or create update-app-headers branch
      - name: Check or create update-app-headers branch
        run: |
          git fetch origin
          if git show-ref --quiet refs/heads/update-app-headers; then
            echo "Switching to 'update-app-headers' branch."
            git checkout update-app-headers
          else
            echo "Creating 'update-app-headers' branch."
            git checkout -b update-app-headers origin/main
          fi

      # Step 4: Merge main into update-app-headers
      - name: Merge main into update-app-headers
        run: |
          git merge origin/main --no-edit || echo "No changes to merge from main."

      # Step 5: Ensure .app-headers file exists
      - name: Ensure .app-headers file exists
        run: |
          if [ ! -f ".app-headers" ]; then
            echo "Creating .app-headers file."
            echo "Generated by CI on $(date)" > .app-headers
          else
            echo ".app-headers file already exists."
          fi

      # Step 6: Commit and push changes (if any)
      - name: Commit and push changes
        run: |
          git diff --quiet -- .app-headers || git commit -am "[core]: update .app-headers to latest version"
          git push origin update-app-headers --force

      # Step 7: Create Pull Request if changes detected
      - name: Create Pull Request if changes detected
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          PR_EXISTS=$(gh pr list --head "update-app-headers" | grep -o '[0-9]\+')
          if [ -z "$PR_EXISTS" ]; then
            echo "Creating a new PR."
            gh pr create --title "[core]: update .app-headers to latest version" \
                         --body "This PR automatically updates the .app-headers file." \
                         --head update-app-headers \
                         --base main
          else
            echo "PR already exists."
          fi

      # Step 8: Automatically merge PR
      - name: Automatically merge PR
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          echo "Attempting to merge PR."
          PR_NUMBER=$(gh pr list --head "update-app-headers" | grep -o '[0-9]\+')
          if [ -n "$PR_NUMBER" ]; then
            gh pr merge "$PR_NUMBER" --merge --admin --delete-branch
            echo "PR merged successfully."
          else
            echo "No PR found to merge."
          fi

      # Step 9: Final status output
      - name: Output final status
        run: |
          echo "Workflow completed successfully. Branch and PR status updated."