name: PR Title Check

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

jobs:
  title-format:
    if: github.repository == 'AstrBotDevs/AstrBot'
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
      issues: write

    steps:
      - name: Validate PR title
        uses: actions/github-script@v9
        with:
          script: |
            const title = (context.payload.pull_request.title || "").trim();
            // Allow Conventional Commit style PR titles.
            // Examples:
            // feat: xxx
            // feat(scope): xxx
            // fix: xxx
            // fix(scope): xxx
            const allowedTypes = "feat|fix|docs|style|refactor|perf|test|chore|ci|build|revert";
            const pattern = new RegExp(`^(${allowedTypes})(\\([a-z0-9-]+\\))?:\\s.+$`, "i");
            const isValid = pattern.test(title);
            const isSameRepo =
              context.payload.pull_request.head.repo.full_name === context.payload.repository.full_name;

            if (!isValid) {
              if (isSameRepo) {
                try {
                  await github.rest.issues.createComment({
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    issue_number: context.payload.pull_request.number,
                    body: [
                      "⚠️ PR title format check failed.",
                      "Required formats:",
                      "- `feat: xxx`",
                      "- `feat(scope): xxx`",
                      "- `fix: xxx`",
                      "- `fix(scope): xxx`",
                      "- `chore: xxx`",
                      "",
                      "Allowed prefixes:",
                      "`feat`, `fix`, `docs`, `style`, `refactor`, `perf`, `test`, `chore`, `ci`, `build`, `revert`",
                      "Please update your PR title and push again."
                    ].join("\n")
                  });
                } catch (e) {
                  core.warning(`Failed to post PR title comment: ${e.message}`);
                }
              } else {
                core.warning("Fork PR: comment permission is restricted; skip posting review comment.");
              }
            }

            if (!isValid) {
              core.setFailed("Invalid PR title. Expected Conventional Commit format, e.g. feat: xxx, feat(scope): xxx, or fix: xxx.");
            }