name: Backend CI/CD Pipeline

on:
  push:
    branches: [main, develop]
    paths:
      - 'backend/**'
  pull_request:
    branches: [main, develop]
    paths:
      - 'backend/**'

jobs:
  test:
    name: 测试
    runs-on: ubuntu-latest
    
    strategy:
      matrix:
        node-version: [20.x]
    
    steps:
      - name: 检出代码
        uses: actions/checkout@v3
      
      - name: 设置Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v3
        with:
          node-version: ${{ matrix.node-version }}
          cache: 'npm'
          cache-dependency-path: backend/package-lock.json
      
      - name: 安装依赖
        working-directory: ./backend
        run: npm ci
      
      - name: 代码检查
        working-directory: ./backend
        run: npm run lint
      
      - name: 运行单元测试
        working-directory: ./backend
        run: npm test -- --coverage --watchAll=false
      
      - name: 上传测试覆盖率报告
        uses: codecov/codecov-action@v3
        with:
          file: ./backend/coverage/lcov.info
          flags: backend
          name: backend-coverage

  build:
    name: 构建
    needs: test
    runs-on: ubuntu-latest
    
    steps:
      - name: 检出代码
        uses: actions/checkout@v3
      
      - name: 设置Node.js
        uses: actions/setup-node@v3
        with:
          node-version: '20'
          cache: 'npm'
          cache-dependency-path: backend/package-lock.json
      
      - name: 安装依赖
        working-directory: ./backend
        run: npm ci
      
      - name: 构建应用
        working-directory: ./backend
        run: npm run build
      
      - name: 上传构建产物
        uses: actions/upload-artifact@v3
        with:
          name: dist
          path: backend/dist

  docker:
    name: Docker镜像
    needs: build
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/main'
    
    steps:
      - name: 检出代码
        uses: actions/checkout@v3
      
      - name: 设置Docker Buildx
        uses: docker/setup-buildx-action@v2
      
      - name: 登录Docker Hub
        uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
      
      - name: 构建并推送Docker镜像
        uses: docker/build-push-action@v4
        with:
          context: ./backend
          file: ./backend/Dockerfile
          push: true
          tags: |
            ${{ secrets.DOCKER_USERNAME }}/ecommerce-backend:latest
            ${{ secrets.DOCKER_USERNAME }}/ecommerce-backend:${{ github.sha }}
          cache-from: type=registry,ref=${{ secrets.DOCKER_USERNAME }}/ecommerce-backend:buildcache
          cache-to: type=registry,ref=${{ secrets.DOCKER_USERNAME }}/ecommerce-backend:buildcache,mode=max