---
name: PR Artifacts

on:
    workflow_dispatch: # Manual trigger for testing
    pull_request:
        types: [opened, synchronize, reopened]
        branches: [main]
    pull_request_review:
        types: [submitted]

jobs:
  # Auto-remove .pr/ directory when a reviewer approves
    cleanup-on-approval:
        concurrency:
            group: cleanup-pr-artifacts-${{ github.event.pull_request.number }}
            cancel-in-progress: false
        if: github.event_name == 'pull_request_review' && github.event.review.state == 'approved'
        runs-on: ubuntu-latest
        permissions:
            contents: write
            pull-requests: write
        steps:
            - name: Check if fork PR
              id: check-fork
              env:
                  HEAD_REPO: ${{ github.event.pull_request.head.repo.full_name }}
                  BASE_REPO: ${{ github.event.pull_request.base.repo.full_name }}
              run: |
                  if [ "$HEAD_REPO" != "$BASE_REPO" ]; then
                    echo "is_fork=true" >> $GITHUB_OUTPUT
                    echo "::notice::Fork PR detected - skipping auto-cleanup (manual removal required)"
                  else
                    echo "is_fork=false" >> $GITHUB_OUTPUT
                  fi

            - uses: actions/checkout@v6
              if: steps.check-fork.outputs.is_fork == 'false'
              with:
                  ref: ${{ github.event.pull_request.head.ref }}
                  token: ${{ secrets.GITHUB_TOKEN }}

            - name: Remove .pr/ directory
              id: remove
              if: steps.check-fork.outputs.is_fork == 'false'
              run: |
                  if [ -d ".pr" ]; then
                    git config user.name "wren-bot"
                    git config user.email "wren-bot@users.noreply.github.com"
                    git rm -rf .pr/
                    git commit -m "chore: Remove PR-only artifacts [automated]"
                    git push || {
                      echo "::error::Failed to push cleanup commit. Check branch protection rules."
                      exit 1
                    }
                    echo "removed=true" >> $GITHUB_OUTPUT
                    echo "::notice::Removed .pr/ directory"
                  else
                    echo "removed=false" >> $GITHUB_OUTPUT
                    echo "::notice::No .pr/ directory to remove"
                  fi

            - name: Update PR comment after cleanup
              if: steps.check-fork.outputs.is_fork == 'false' && steps.remove.outputs.removed == 'true'
              uses: actions/github-script@v9
              with:
                  script: |
                      const marker = '<!-- pr-artifacts-notice -->';
                      const body = `${marker}
                      ✅ **PR Artifacts Cleaned Up**

                      The \`.pr/\` directory has been automatically removed.
                      `;

                      const { data: comments } = await github.rest.issues.listComments({
                        owner: context.repo.owner,
                        repo: context.repo.repo,
                        issue_number: context.issue.number,
                      });

                      const existing = comments.find(c => c.body.includes(marker));
                      if (existing) {
                        await github.rest.issues.updateComment({
                          owner: context.repo.owner,
                          repo: context.repo.repo,
                          comment_id: existing.id,
                          body: body,
                        });
                      }

  # Warn if .pr/ directory exists (will be auto-removed on approval)
    check-pr-artifacts:
        if: github.event_name == 'pull_request'
        runs-on: ubuntu-latest
        permissions:
            contents: read
            pull-requests: write
        steps:
            - uses: actions/checkout@v6

            - name: Check for .pr/ directory
              id: check
              run: |
                  if [ -d ".pr" ]; then
                    echo "exists=true" >> $GITHUB_OUTPUT
                    echo "::warning::.pr/ directory exists and will be automatically removed when the PR is approved. For fork PRs, manual removal is required before merging."
                  else
                    echo "exists=false" >> $GITHUB_OUTPUT
                  fi

            - name: Post or update PR comment
              if: steps.check.outputs.exists == 'true'
              uses: actions/github-script@v9
              with:
                  script: |
                      const marker = '<!-- pr-artifacts-notice -->';
                      const body = `${marker}
                      📁 **PR Artifacts Notice**

                      This PR contains a \`.pr/\` directory with PR-specific documents. This directory will be **automatically removed** when the PR is approved.

                      > For fork PRs: Manual removal is required before merging.
                      `;

                      const { data: comments } = await github.rest.issues.listComments({
                        owner: context.repo.owner,
                        repo: context.repo.repo,
                        issue_number: context.issue.number,
                      });

                      const existing = comments.find(c => c.body.includes(marker));
                      if (!existing) {
                        await github.rest.issues.createComment({
                          owner: context.repo.owner,
                          repo: context.repo.repo,
                          issue_number: context.issue.number,
                          body: body,
                        });
                      }