name: Comment on PR (Generated VRL Docs)

on:
  workflow_run:
    workflows: ["Check Generated VRL Docs Freshness"]
    types:
      - completed

permissions:
  contents: read

jobs:
  comment:
    runs-on: ubuntu-latest
    if: >
      github.event.workflow_run.conclusion == 'failure'
      && github.event.workflow_run.event == 'pull_request'
    permissions:
      pull-requests: write
    steps:
      - name: Download PR metadata
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
        with:
          name: vrl-docs-check-pr
          run-id: ${{ github.event.workflow_run.id }}
          github-token: ${{ github.token }}

      - name: Comment on PR
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          script: |
            const fs = require('fs');
            const prNumber = parseInt(fs.readFileSync('pr-number', 'utf8').trim(), 10);
            if (isNaN(prNumber)) {
              core.setFailed('Invalid PR number');
              return;
            }

            const marker = '<!-- generated-vrl-docs-check -->';
            const body = marker + '\nThe `docs/generated/` folder is out of date but I was unable to push the fix automatically.\n\nPlease run the following and commit the result:\n\n```\nmake generate-vector-vrl-docs\n```';

            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: prNumber,
            });
            const existing = comments.find(c => c.body.startsWith(marker));
            if (existing) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: existing.id,
                body,
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: prNumber,
                body,
              });
            }