name: pr

# Lints PR titles (conventional commits).
on:
  pull_request_target:
    types: [opened, edited, reopened, synchronize]

jobs:
  pr-title:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - uses: actions/checkout@v6
      - name: Check PR title format
        uses: actions/github-script@v9
        with:
          script: |
            const title = context.payload.pull_request.title;
            const conventionalPattern = /^(feat|fix|docs|style|refactor|perf|test|build|ci|chore|revert)(\(.+\))?!?: .+/;
            if (!conventionalPattern.test(title)) {
              const { data: comments } = await github.rest.issues.listComments({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
              });
              const marker = '<!-- pr-title-warning -->';
              const existing = comments.find(c => c.body.includes(marker));
              const body = `${marker}
              ⚠️ **PR Title Format**

              Please use conventional commit format: \`type: description\`
              Examples: \`feat: add new feature\`, \`fix: resolve bug\`, \`docs: update readme\`
              `;
              if (!existing) {
                await github.rest.issues.createComment({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: context.issue.number,
                  body: body,
                });
              }
            }