# 提交标题规则须与 .githooks/commit-msg 中的 PATTERN 保持一致
name: Commit messages

on:
  pull_request:

permissions:
  contents: read

jobs:
  check:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Verify first line of each commit
        env:
          BASE_SHA: ${{ github.event.pull_request.base.sha }}
          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
        run: |
          set -euo pipefail
          PATTERN='^\[(feat|fix|docs|style|refactor|perf|test|chore|ci|build|revert)\] .+'
          bad=0
          while IFS= read -r line; do
            [ -z "$line" ] && continue
            sha="${line%%$'\t'*}"
            subject="${line#*$'\t'}"
            case "$subject" in
              Merge*) continue ;;
              Revert*) continue ;;
            esac
            if ! printf '%s\n' "$subject" | grep -qE "$PATTERN"; then
              echo "::error title=Invalid commit message::${sha:0:7} ${subject}"
              bad=1
            fi
          done < <(git log --format=%H%x09%s "${BASE_SHA}..${HEAD_SHA}")

          if [ "$bad" -ne 0 ]; then
            echo ""
            echo "提交说明：首行须为 \"[类型] 摘要\"，类型只能是以下枚举之一（小写）："
            echo "  feat 新功能 | fix 缺陷修复 | docs 文档 | style 格式 | refactor 重构 | perf 性能"
            echo "  test 测试 | chore 杂项/工具 | ci CI 配置 | build 构建/依赖 | revert 回滚"
            echo "示例：[feat] 新功能 / [fix] 修复登录 / [docs] 更新 README"
            echo ""
            echo "Commit subject: first line must be \"[type] summary\" with type one of (lowercase only):"
            echo "  feat, fix, docs, style, refactor, perf, test, chore, ci, build, revert"
            echo "Examples: [feat] add feature, [fix] repair login, [docs] update README"
            echo "Subjects starting with Merge / Revert are skipped."
            exit 1
          fi