name: PR Body Check
on:
  pull_request:
    types:
      - opened
      - edited
      - reopened
      - synchronize
    branches:
      - develop

permissions:
  contents: read

jobs:
  pr-body-check:
    if: github.repository_owner == 'GameServerManagers' && github.event.pull_request.user.type != 'Bot' && !startsWith(github.event.pull_request.head.ref, 'repo-sync/')
    runs-on: ubuntu-latest
    steps:
      - name: Check pull request body follows the template
        uses: actions/github-script@v9
        with:
          script: |
            const body = (context.payload.pull_request.body || '').replace(/<!--[\s\S]*?-->/g, '');
            const requiredHeadings = ['# Description', '## Type of change', '## Testing', '## Checklist'];
            const missing = requiredHeadings.filter((h) => !body.split(/\r?\n/).some((line) => line.trim() === h));
            const errors = [];

            if (missing.length > 0) {
              errors.push(`Missing template sections: ${missing.join(', ')}. Use .github/pull_request_template.md as the pull request body.`);
            }
            if (/^\s*fixes #\[issue\]\s*$/im.test(body)) {
              errors.push('Replace the "Fixes #[issue]" placeholder with the issue number, for example "Fixes #123".');
            }

            const closingKeyword = /\b(close[sd]?|fix(e[sd])?|resolve[sd]?):?\s+([\w.-]+\/[\w.-]+)?#\d+/i;
            const relatedIssue = /\brelated to:?\s+([\w.-]+\/[\w.-]+)?#\d+/i;
            if (!closingKeyword.test(body) && !relatedIssue.test(body)) {
              core.warning('No closing keyword found. Add "Fixes #123" to link the issue, or "Related to #123" if this pull request does not fully resolve it.');
            }

            if (errors.length > 0) {
              core.setFailed(errors.join('\n'));
            }