name: PR template check

on:
  pull_request_target:
    types: [opened, edited]

permissions:
  pull-requests: write

jobs:
  check_template:
    name: Validate PR description
    runs-on: ubuntu-latest
    steps:
      - name: Check PR description against template
        uses: actions/github-script@v7
        with:
          script: |
            const maintainers = ['blakeblackshear', 'NickM-27', 'hawkeye217', 'dependabot[bot]'];
            const author = context.payload.pull_request.user.login;

            if (maintainers.includes(author)) {
              console.log(`Skipping template check for maintainer: ${author}`);
              return;
            }

            const body = context.payload.pull_request.body || '';
            const errors = [];

            // Check that key template sections exist
            const requiredSections = [
              '## Proposed change',
              '## Type of change',
              '## AI disclosure',
              '## Checklist',
            ];

            for (const section of requiredSections) {
              if (!body.includes(section)) {
                errors.push(`Missing section: **${section}**`);
              }
            }

            // Check that "Proposed change" has content beyond the default HTML comment
            const proposedChangeMatch = body.match(
              /## Proposed change\s*(?:<!--[\s\S]*?-->\s*)?([\s\S]*?)(?=\n## )/
            );
            const proposedContent = proposedChangeMatch
              ? proposedChangeMatch[1].trim()
              : '';
            if (!proposedContent) {
              errors.push(
                'The **Proposed change** section is empty. Please describe what this PR does.'
              );
            }

            // Check that at least one "Type of change" checkbox is checked
            const typeSection = body.match(
              /## Type of change\s*([\s\S]*?)(?=\n## )/
            );
            if (typeSection && !/- \[x\]/i.test(typeSection[1])) {
              errors.push(
                'No **Type of change** selected. Please check at least one option.'
              );
            }

            // Check that at least one AI disclosure checkbox is checked
            const aiSection = body.match(
              /## AI disclosure\s*([\s\S]*?)(?=\n## )/
            );
            if (aiSection && !/- \[x\]/i.test(aiSection[1])) {
              errors.push(
                'No **AI disclosure** option selected. Please indicate whether AI tools were used.'
              );
            }

            // Check that at least one checklist item is checked
            const checklistSection = body.match(
              /## Checklist\s*([\s\S]*?)$/
            );
            if (checklistSection && !/- \[x\]/i.test(checklistSection[1])) {
              errors.push(
                'No **Checklist** items checked. Please review and check the items that apply.'
              );
            }

            if (errors.length === 0) {
              console.log('PR description passes template validation.');
              return;
            }

            const prNumber = context.payload.pull_request.number;
            const message = [
              '## PR template validation failed',
              '',
              'This PR was automatically closed because the description does not follow the [pull request template](https://github.com/blakeblackshear/frigate/blob/dev/.github/pull_request_template.md).',
              '',
              '**Issues found:**',
              ...errors.map((e) => `- ${e}`),
              '',
              'Please update your PR description to include all required sections from the template, then reopen this PR.',
              '',
              '> If you used an AI tool to generate this PR, please see our [contributing guidelines](https://github.com/blakeblackshear/frigate/blob/dev/CONTRIBUTING.md) for details.',
            ].join('\n');

            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: prNumber,
              body: message,
            });

            await github.rest.pulls.update({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: prNumber,
              state: 'closed',
            });

            core.setFailed('PR description does not follow the template.');