name: Stale Release Branch Cleanup

on:
  schedule:
    - cron: '0 9 * * 1'  # Weekly every Monday at 09:00 UTC
  workflow_dispatch:
    inputs:
      dry_run:
        description: 'Dry run (no changes made)'
        required: false
        default: false
        type: boolean

jobs:
  cleanup-stale-branches:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          sparse-checkout: |
            .github
          sparse-checkout-cone-mode: false

      - name: Fetch all branches
        run: git fetch --all --prune

      - name: Find and clean stale release branches
        id: stale
        env:
          DRY_RUN: ${{ github.event.inputs.dry_run || false }}
        run: |
          DAYS=14

          # Find release branches older than 14 days not on main
          for branch in $(git for-each-ref --format '%(refname:strip=3)' 'refs/remotes/origin/release/*' 'refs/remotes/origin/v[0-9]*'); do
            ts=$(git log -1 --format='%ct' "refs/remotes/origin/$branch")
            if [ -z "$ts" ]; then
              continue
            fi
            age_days=$(( ($(date +%s) - ts) / 86400 ))

            if [ "$age_days" -gt "$DAYS" ]; then
              # Check if branch has been merged into main
              if git merge-base --is-ancestor "refs/remotes/origin/$branch" main 2>/dev/null; then
                echo "Merged branch found: $branch (age: ${age_days}d)"
                if [ "$DRY_RUN" == "true" ]; then
                  echo "Would delete merged branch: $branch"
                else
                  echo "Deleting merged branch: $branch"
                  if ! git push origin --delete "$branch" 2>&1; then
                    echo "::warning::Failed to delete branch: $branch"
                  fi
                fi
              fi
            fi
          done

      - name: Report dry run results
        if: github.event.inputs.dry_run == 'true'
        run: |
          echo "Dry run complete. No branches were deleted."
          echo ""
          echo "Release branches found:"
          git for-each-ref --format '%(refname:strip=3) - %(committerdate:relative)' \
            'refs/remotes/origin/release/*' 'refs/remotes/origin/v[0-9]*' 2>/dev/null || echo "None found"