name: PR Title Check

on:
  pull_request:
    types: [opened, edited, synchronize, reopened]

jobs:
  check-title:
    runs-on: ubuntu-latest
    steps:
      - name: Validate PR title prefix
        uses: actions/github-script@v7
        with:
          script: |
            const title = context.payload.pull_request.title;
            const allowedTags = [
              'management',
              'client',
              'signal',
              'proxy',
              'relay',
              'misc',
              'infrastructure',
              'self-hosted',
              'doc',
            ];

            const pattern = /^\[([^\]]+)\]\s+.+/;
            const match = title.match(pattern);

            if (!match) {
              core.setFailed(
                `PR title must start with a tag in brackets.\n` +
                `Example: [client] fix something\n` +
                `Allowed tags: ${allowedTags.join(', ')}`
              );
              return;
            }

            const tags = match[1].split(',').map(t => t.trim().toLowerCase());

            const invalid = tags.filter(t => !allowedTags.includes(t));
            if (invalid.length > 0) {
              core.setFailed(
                `Invalid tag(s): ${invalid.join(', ')}\n` +
                `Allowed tags: ${allowedTags.join(', ')}`
              );
              return;
            }

            console.log(`Valid PR title tags: [${tags.join(', ')}]`);