name: Cleanup Decision Graph PNGs

on:
  pull_request:
    types: [closed]

jobs:
  cleanup:
    # Only run if PR was merged (not just closed)
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Find and remove decision graph PNGs
        id: find-pngs
        run: |
          # Find decision graph PNGs (in docs/ or root)
          PNGS=$(find . -name "decision-graph*.png" -o -name "deciduous-graph*.png" 2>/dev/null | grep -v node_modules || true)

          if [ -z "$PNGS" ]; then
            echo "No decision graph PNGs found"
            echo "found=false" >> $GITHUB_OUTPUT
          else
            echo "Found PNGs to clean up:"
            echo "$PNGS"
            echo "found=true" >> $GITHUB_OUTPUT

            # Remove the files
            echo "$PNGS" | xargs rm -f

            # Also remove corresponding .dot files
            for png in $PNGS; do
              dot_file="${png%.png}.dot"
              if [ -f "$dot_file" ]; then
                rm -f "$dot_file"
                echo "Also removed: $dot_file"
              fi
            done
          fi

      - name: Create cleanup PR
        if: steps.find-pngs.outputs.found == 'true'
        run: |
          # Check if there are changes to commit
          if git diff --quiet && git diff --staged --quiet; then
            echo "No changes to commit"
            exit 0
          fi

          # Configure git
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

          # Create branch and commit
          BRANCH="cleanup/decision-graphs-pr-${{ github.event.pull_request.number }}"
          git checkout -b "$BRANCH"
          git add -A
          git commit -m "chore: cleanup decision graph assets from PR #${{ github.event.pull_request.number }}"
          git push origin "$BRANCH"

          # Create and auto-merge PR
          gh pr create \
            --title "chore: cleanup decision graph assets from PR #${{ github.event.pull_request.number }}" \
            --body "Automated cleanup of decision graph PNG/DOT files that were used in PR #${{ github.event.pull_request.number }}.

          These files served their purpose for PR review and are no longer needed." \
            --head "$BRANCH" \
            --base main

          # Auto-merge (requires auto-merge enabled on repo)
          gh pr merge "$BRANCH" --auto --squash --delete-branch || echo "Auto-merge not enabled, PR created for manual merge"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}