name: Comment on PR when issue is closed

on:
  issues:
    types: [closed]

jobs:
  comment-on-issue-closure:
    runs-on: ubuntu-latest
    # Only run if the issue was closed by a commit (not manually)
    if: ${{ github.event.issue.closed_by.type == 'Bot' || github.event.issue.closed_by.login != null }}
    steps:
      - name: Check if issue was closed by commit
        id: check-commit
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const issueNumber = context.payload.issue.number;

            // Get the issue events to find the "closed" event with commit_id
            const { data: events } = await github.rest.issues.listEvents({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: issueNumber
            });

            // Find the most recent "closed" event
            const closedEvent = events
              .filter(event => event.event === 'closed')
              .pop(); // Get the last (most recent) closed event

            if (closedEvent && closedEvent.commit_id) {
              console.log(`✅ Issue #${issueNumber} was closed by commit: ${closedEvent.commit_id}`);
              
              // Get commit details
              const { data: commit } = await github.rest.git.getCommit({
                owner: context.repo.owner,
                repo: context.repo.repo,
                commit_sha: closedEvent.commit_id
              });
              
              core.setOutput('closed_by_commit', 'true');
              core.setOutput('commit_sha', closedEvent.commit_id);
              core.setOutput('commit_message', commit.message);
              core.setOutput('commit_url', closedEvent.commit_url);
            } else {
              console.log(`ℹ️  Issue #${issueNumber} was closed manually (not by commit)`);
              core.setOutput('closed_by_commit', 'false');
            }

      - name: Determine closure method and comment on issue
        if: steps.check-commit.outputs.closed_by_commit == 'true'
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const issueNumber = context.payload.issue.number;
            const commitSha = '${{ steps.check-commit.outputs.commit_sha }}';
            const commitMessage = '${{ steps.check-commit.outputs.commit_message }}';
            const commitUrl = '${{ steps.check-commit.outputs.commit_url }}';

            try {
              // Find PRs that include this commit
              const { data: prs } = await github.rest.pulls.list({
                owner: context.repo.owner,
                repo: context.repo.repo,
                state: 'all',
                sort: 'updated',
                direction: 'desc',
                per_page: 100
              });
              
              let closingPR = null;
              
              // Check each PR to see if it contains our commit
              for (const pr of prs) {
                try {
                  const { data: commits } = await github.rest.pulls.listCommits({
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    pull_number: pr.number
                  });
                  
                  if (commits.some(commit => commit.sha === commitSha)) {
                    closingPR = pr;
                    console.log(`✅ Found PR #${pr.number} containing commit ${commitSha.substring(0, 7)}`);
                    break;
                  }
                } catch (error) {
                  console.log(`Error checking commits for PR #${pr.number}: ${error.message}`);
                }
              }
              
              // If no PR found with the exact commit, try alternative approaches
              if (!closingPR) {
                console.log(`🔍 No PR found with exact commit ${commitSha.substring(0, 7)}, trying alternative search...`);
                
                // Try to find a merged PR that mentions this issue
                const relatedPRs = prs.filter(pr => 
                  pr.state === 'closed' && 
                  pr.merged_at &&
                  (pr.title.includes(`#${issueNumber}`) || 
                   pr.body?.includes(`#${issueNumber}`))
                );
                
                if (relatedPRs.length > 0) {
                  closingPR = relatedPRs[0];
                  console.log(`✅ Found related PR #${closingPR.number} that mentions issue #${issueNumber}`);
                }
              }
              
              const closedRef = closingPR
                ? `#${closingPR.number}`
                : `[\`${commitSha.substring(0, 7)}\`](${commitUrl})`
              
              const comment = `This issue has been fixed in ${closedRef}, please check with the next unstable build (should be ready for deployment in ~30min, also on [the demo](https://try.vikunja.io).`
              
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: issueNumber,
                body: comment,
              });
              
              if (closingPR) {
                console.log(`✅ Added comment to issue #${issueNumber} (closed by PR #${closingPR.number})`);
              } else {
                console.log(`✅ Added comment to issue #${issueNumber} (closed by direct commit ${commitSha.substring(0, 7)})`);
              }
              
            } catch (error) {
              console.error(`❌ Error processing issue #${issueNumber}: ${error.message}`);
              throw error;
            }