name: HR Portal CI/CD

on:
  push:
    branches:
      - main       # 生產環境
      - dev        # 測試環境
  pull_request:
    branches:
      - main
      - dev

env:
  REGISTRY: git.lab.taipei
  IMAGE_NAME_BACKEND: porscheworld/hr-portal-backend
  IMAGE_NAME_FRONTEND: porscheworld/hr-portal-frontend

jobs:
  # ==============================================
  # 測試階段 - 後端
  # ==============================================
  test-backend:
    name: Test Backend (FastAPI)
    runs-on: ubuntu-latest

    services:
      postgres:
        image: postgres:16-alpine
        env:
          POSTGRES_DB: hr_portal_test
          POSTGRES_USER: test_user
          POSTGRES_PASSWORD: test_password
        ports:
          - 5432:5432
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5

    steps:
      - name: Checkout Code
        uses: actions/checkout@v4

      - name: Set up Python 3.11
        uses: actions/setup-python@v4
        with:
          python-version: '3.11'
          cache: 'pip'

      - name: Install Dependencies
        working-directory: ./backend
        run: |
          pip install --upgrade pip
          pip install -r requirements.txt

      - name: Run Tests with Coverage
        working-directory: ./backend
        env:
          DATABASE_HOST: localhost
          DATABASE_PORT: 5432
          DATABASE_NAME: hr_portal_test
          DATABASE_USER: test_user
          DATABASE_PASSWORD: test_password
        run: |
          pytest tests/ --cov=app --cov-report=term-missing --cov-report=xml

      - name: Upload Coverage to Codecov
        uses: codecov/codecov-action@v3
        with:
          file: ./backend/coverage.xml
          flags: backend
          name: backend-coverage

  # ==============================================
  # 測試階段 - 前端
  # ==============================================
  test-frontend:
    name: Test Frontend (Next.js)
    runs-on: ubuntu-latest

    steps:
      - name: Checkout Code
        uses: actions/checkout@v4

      - name: Set up Node.js 18
        uses: actions/setup-node@v4
        with:
          node-version: '18'
          cache: 'npm'
          cache-dependency-path: ./frontend/package-lock.json

      - name: Install Dependencies
        working-directory: ./frontend
        run: npm ci

      - name: Run Lint
        working-directory: ./frontend
        run: npm run lint

      - name: Run Type Check
        working-directory: ./frontend
        run: npx tsc --noEmit

      - name: Build
        working-directory: ./frontend
        run: npm run build

  # ==============================================
  # 建置與推送映像 - 後端
  # ==============================================
  build-backend:
    name: Build Backend Image
    needs: test-backend
    runs-on: ubuntu-latest
    if: github.event_name == 'push'

    steps:
      - name: Checkout Code
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to Gitea Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.GITEA_USERNAME }}
          password: ${{ secrets.GITEA_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_BACKEND }}
          tags: |
            type=ref,event=branch
            type=sha,prefix={{branch}}-
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Build and Push
        uses: docker/build-push-action@v5
        with:
          context: ./backend
          file: ./backend/Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME_BACKEND }}:buildcache
          cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME_BACKEND }}:buildcache,mode=max

  # ==============================================
  # 建置與推送映像 - 前端
  # ==============================================
  build-frontend:
    name: Build Frontend Image
    needs: test-frontend
    runs-on: ubuntu-latest
    if: github.event_name == 'push'

    steps:
      - name: Checkout Code
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to Gitea Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.GITEA_USERNAME }}
          password: ${{ secrets.GITEA_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_FRONTEND }}
          tags: |
            type=ref,event=branch
            type=sha,prefix={{branch}}-
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Build and Push
        uses: docker/build-push-action@v5
        with:
          context: ./frontend
          file: ./frontend/Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME_FRONTEND }}:buildcache
          cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME_FRONTEND }}:buildcache,mode=max

  # ==============================================
  # 部署到測試環境 (dev 分支)
  # ==============================================
  deploy-testing:
    name: Deploy to Testing Environment
    needs: [build-backend, build-frontend]
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/dev'
    environment:
      name: testing
      url: https://test.hr.ease.taipei

    steps:
      - name: Checkout Code
        uses: actions/checkout@v4

      - name: Deploy to Testing Server
        uses: appleboy/ssh-action@v1.0.0
        with:
          host: ${{ secrets.DEPLOY_HOST }}
          username: ${{ secrets.DEPLOY_USER }}
          key: ${{ secrets.DEPLOY_SSH_KEY }}
          port: 22
          script: |
            cd /opt/deployments/hr-portal-test

            # 拉取最新映像
            docker-compose -f docker-compose.prod.yml pull

            # 重啟服務
            docker-compose -f docker-compose.prod.yml up -d

            # 清理舊映像
            docker image prune -f

            # 檢查服務狀態
            docker-compose -f docker-compose.prod.yml ps

  # ==============================================
  # 部署到生產環境 (main 分支)
  # ==============================================
  deploy-production:
    name: Deploy to Production Environment
    needs: [build-backend, build-frontend]
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/main'
    environment:
      name: production
      url: https://hr.ease.taipei

    steps:
      - name: Checkout Code
        uses: actions/checkout@v4

      - name: Deploy to Production Server
        uses: appleboy/ssh-action@v1.0.0
        with:
          host: ${{ secrets.DEPLOY_HOST }}
          username: ${{ secrets.DEPLOY_USER }}
          key: ${{ secrets.DEPLOY_SSH_KEY }}
          port: 22
          script: |
            cd /opt/deployments/hr-portal-prod

            # 拉取最新映像
            docker-compose -f docker-compose.prod.yml pull

            # 執行資料庫備份
            docker exec hr-portal-postgres-prod pg_dump -U hr_admin hr_portal | gzip > backup-$(date +%Y%m%d-%H%M%S).sql.gz

            # 滾動更新 (零停機部署)
            docker-compose -f docker-compose.prod.yml up -d --no-deps --build backend
            sleep 10
            docker-compose -f docker-compose.prod.yml up -d --no-deps --build frontend

            # 清理舊映像
            docker image prune -f

            # 檢查服務狀態
            docker-compose -f docker-compose.prod.yml ps

            # 健康檢查
            curl -f https://hr-api.ease.taipei/health || exit 1

  # ==============================================
  # 通知
  # ==============================================
  notify:
    name: Send Notification
    needs: [deploy-testing, deploy-production]
    runs-on: ubuntu-latest
    if: always()

    steps:
      - name: Send Notification
        run: |
          echo "Deployment completed for branch: ${{ github.ref_name }}"
          # TODO: 整合 Email 或 Slack 通知