name: PR Compliance

on:
  pull_request:
    branches: [main]
    types: [opened, edited, synchronize]

permissions:
  contents: read

jobs:
  check-pr:
    name: Validate PR
    if: github.actor != 'dependabot[bot]' && github.actor != 'renovate[bot]' && github.actor != 'emdashbot[bot]'
    runs-on: ubuntu-latest
    steps:
      - name: Check PR template
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
        with:
          script: |
            const body = context.payload.pull_request.body || '';

            const errors = [];

            // Must have a description (not just the raw template placeholder)
            const descriptionSection = body.match(/## What does this PR do\?\s*\n([\s\S]*?)(?=\n## )/);
            const description = descriptionSection?.[1]?.replace(/<!--[\s\S]*?-->/g, '').trim() || '';
            if (!description || description === 'Closes #') {
              errors.push('Fill out the "What does this PR do?" section with a description of your change.');
            }

            // Must check at least one type
            const typeChecks = [
              /- \[x\] Bug fix/i,
              /- \[x\] Feature/i,
              /- \[x\] Refactor/i,
              /- \[x\] Documentation/i,
              /- \[x\] Performance/i,
              /- \[x\] Tests/i,
              /- \[x\] Chore/i,
            ];
            const hasType = typeChecks.some(re => re.test(body));
            if (!hasType) {
              errors.push('Check at least one "Type of change" checkbox.');
            }

            // If Feature is checked, require a discussion link
            const isFeature = /- \[x\] Feature/i.test(body);
            if (isFeature) {
              const hasDiscussionLink = /github\.com\/emdash-cms\/emdash\/discussions\/\d+/.test(body);
              if (!hasDiscussionLink) {
                errors.push('Feature PRs require a link to an approved Discussion (https://github.com/emdash-cms/emdash/discussions/categories/ideas). Open a Discussion first, get approval, then link it in the PR.');
              }
            }

            // Must check the "I have read CONTRIBUTING.md" box
            const hasReadContributing = /- \[x\] I have read \[CONTRIBUTING\.md\]/i.test(body);
            if (!hasReadContributing) {
              errors.push('Check the "I have read CONTRIBUTING.md" checkbox.');
            }

            if (errors.length > 0) {
              const message = [
                '## PR template validation failed',
                '',
                'Please fix the following issues by editing your PR description:',
                '',
                ...errors.map(e => `- ${e}`),
                '',
                'See [CONTRIBUTING.md](https://github.com/emdash-cms/emdash/blob/main/CONTRIBUTING.md) for the full contribution policy.',
              ].join('\n');

              core.setFailed(message);
            }