.github/workflows/comment-pr-build.yml

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name: Comment on PR build results

on:
  workflow_run:
    workflows: ["Build cmk binaries on PR"]
    types:
      - completed

permissions:
  contents: read
  issues: write
  pull-requests: write

jobs:
  comment:
    runs-on: ubuntu-24.04
    if: >
      github.event.workflow_run.event == 'pull_request'
    steps:
      - name: Download artifact metadata
        uses: actions/github-script@v7
        id: artifact-metadata
        with:
          script: |
            const artifacts = await github.rest.actions.listWorkflowRunArtifacts({
              owner: context.repo.owner,
              repo: context.repo.repo,
              run_id: context.payload.workflow_run.id,
            });
            
            const prArtifact = artifacts.data.artifacts.find(a => a.name.startsWith('cmk-binaries.pr'));
            
            if (prArtifact) {
              const prNumber = prArtifact.name.match(/pr(\d+)/)?.[1];
              return {
                artifact_url: prArtifact.archive_download_url,
                pr_number: prNumber,
                conclusion: context.payload.workflow_run.conclusion
              };
            }
            
            return {
              pr_number: null,
              conclusion: context.payload.workflow_run.conclusion
            };

      - name: Get PR number from workflow run
        id: get-pr
        uses: actions/github-script@v7
        with:
          script: |
            const metadata = ${{ steps.artifact-metadata.outputs.result }};
            
            if (metadata.pr_number) {
              return metadata.pr_number;
            }
            
            // Fallback: get PR from workflow run
            const pulls = await github.rest.pulls.list({
              owner: context.repo.owner,
              repo: context.repo.repo,
              state: 'open',
              head: `${context.repo.owner}:${context.payload.workflow_run.head_branch}`
            });
            
            if (pulls.data.length > 0) {
              return pulls.data[0].number;
            }
            
            return null;

      - name: Comment or update build result on PR
        uses: actions/github-script@v7
        with:
          script: |
            const { execSync } = require('child_process');
            const prNumber = ${{ steps.get-pr.outputs.result }};
            
            if (!prNumber) {
              core.warning('Could not determine PR number, skipping comment');
              return;
            }

            const identifier = "cmk-build-artifact-comment";
            const owner = context.repo.owner;
            const repo = context.repo.repo;
            const conclusion = '${{ github.event.workflow_run.conclusion }}';
            const runId = '${{ github.event.workflow_run.id }}';
            const runUrl = `https://github.com/${owner}/${repo}/actions/runs/${runId}`;

            core.info(`Commenting on PR #${prNumber}`);
            core.info(`Build conclusion: ${conclusion}`);

            let body = `<!-- ${identifier} -->\n`;
            
            if (conclusion === 'success') {
              const expiryDate = execSync("date -d '+10 days' '+%B %d, %Y'").toString().trim();
              body += `✅ Build complete for PR #${prNumber}.\n\n`;
              body += `📦 Binary artifacts are available in the [workflow run](${runUrl}) (expires on ${expiryDate}).\n\n`;
              body += `> **Note:** Download artifacts by clicking on the workflow run link above, then scroll to the "Artifacts" section.`;
            } else if (conclusion === 'failure') {
              body += `❌ Build failed for PR #${prNumber}.\n\n`;
              body += `See the [workflow run](${runUrl}) for details.`;
            } else {
              body += `⚠️ Build ${conclusion} for PR #${prNumber}.\n\n`;
              body += `See the [workflow run](${runUrl}) for details.`;
            }

            const { data: comments } = await github.rest.issues.listComments({
              owner,
              repo,
              issue_number: prNumber
            });
            
            const existing = comments.find(c => 
              c.user.login === 'github-actions[bot]' && 
              c.body.includes(identifier)
            );

            if (existing) {
              core.info(`Updating existing comment id ${existing.id}`);
              await github.rest.issues.updateComment({
                owner,
                repo,
                comment_id: existing.id,
                body
              });
            } else {
              core.info(`Creating new comment`);
              await github.rest.issues.createComment({
                owner,
                repo,
                issue_number: prNumber,
                body
              });
            }