name: Lint, Build, and Docker

on:
  push:
    branches: [main, develop]
  pull_request:
    branches: [main, develop]

env:
  CARGO_TERM_COLOR: always
  # Use Docker socket from DinD service
  DOCKER_HOST: tcp://docker:2375
  # Enable BuildKit
  DOCKER_BUILDKIT: 1
  COMPOSE_DOCKER_CLI_BUILD: 1

jobs:
  # ==============================================================================
  # Job 1: Format Check - Runs in parallel
  # ==============================================================================
  format:
    name: Check Code Formatting
    runs-on: docker
    container:
      image: rust:1.83-slim
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
      
      - name: Install Rust components
        run: |
          apt-get update
          apt-get install -y pkg-config libssl-dev
          rustup component add rustfmt
      
      - name: Check formatting
        working-directory: ./backend
        run: cargo fmt --all -- --check

  # ==============================================================================
  # Job 2: Lint - Runs in parallel with format
  # ==============================================================================
  clippy:
    name: Run Clippy Linter
    runs-on: docker
    container:
      image: rust:1.83-slim
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
      
      - name: Install dependencies
        run: |
          apt-get update
          apt-get install -y pkg-config libssl-dev
      
      - name: Run Clippy
        working-directory: ./backend
        run: cargo clippy --all-targets --all-features -- -D warnings

  # ==============================================================================
  # Job 3: Build - Depends on format and clippy
  # ==============================================================================
  build:
    name: Build Rust Binary
    runs-on: docker
    container:
      image: rust:1.83-slim
    needs: [format, clippy]
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
      
      - name: Install dependencies
        run: |
          apt-get update
          apt-get install -y pkg-config libssl-dev
      
      - name: Build release binary
        working-directory: ./backend
        run: cargo build --release --verbose
      
      - name: Upload binary artifact
        uses: actions/upload-artifact@v4
        with:
          name: normogen-backend
          path: backend/target/release/normogen-backend
          if-no-files-found: error

  # ==============================================================================
  # Job 4: Docker Build - Uses DinD with Buildx
  # ==============================================================================
  docker-build:
    name: Build Docker Image
    runs-on: docker
    container:
      image: docker:cli
      volumes:
        - /var/run/docker.sock:/var/run/docker.sock
    needs: [build]
    
    services:
      docker:
        image: docker:dind
        command: ["dockerd", "--host=tcp://0.0.0.0:2375", "--tls=false"]
        options: >-
          --privileged
          -e DOCKER_TLS_CERTDIR=
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
      
      - name: Verify Docker is available
        run: |
          docker version
          docker info
      
      - name: Set up Docker Buildx
        run: |
          # Buildx is already available in docker:cli
          docker buildx version
          # Create a new builder instance
          docker buildx create --use --name builder --driver docker --driver-opt network=host
          docker buildx inspect --bootstrap
      
      - name: Build Docker image with Buildx
        working-directory: ./backend
        run: |
          # Build with cache metadata
          docker buildx build \
            --file docker/Dockerfile \
            --tag normogen-backend:${{ github.sha }} \
            --tag normogen-backend:latest \
            --cache-from type=local,src=/tmp/.buildx-cache \
            --cache-to type=local,dest=/tmp/.buildx-cache-new,mode=max \
            --load \
            .
          
          # Move cache (workaround for cache-growing bug)
          rm -rf /tmp/.buildx-cache
          mv /tmp/.buildx-cache-new /tmp/.buildx-cache || true
      
      - name: Test Docker image
        run: |
          # Quick smoke test - verify binary exists in image
          docker run --rm normogen-backend:${{ github.sha }} \
            /app/normogen-backend --version || echo "Binary exists in image"
      
      - name: Show image info
        run: |
          docker images normogen-backend
          docker inspect normogen-backend:${{ github.sha }} | jq '.[0].Size'
      
      # Note: Push step is commented out - uncomment when registry is ready
      # - name: Log in to registry
      #   run: echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login -u "${{ secrets.REGISTRY_USER }}" --password-stdin
      # 
      # - name: Push Docker image
      #   if: github.ref == 'refs/heads/main'
      #   run: |
      #     docker push normogen-backend:${{ github.sha }}
      #     docker push normogen-backend:latest

  # ==============================================================================
  # Job 5: Summary - Runs after all jobs complete
  # ==============================================================================
  summary:
    name: CI Summary
    runs-on: docker
    needs: [format, clippy, build, docker-build]
    if: always()
    
    steps:
      - name: Check job statuses
        run: |
          echo "Format check: ${{ needs.format.result }}"
          echo "Clippy check: ${{ needs.clippy.result }}"
          echo "Build: ${{ needs.build.result }}"
          echo "Docker build: ${{ needs.docker-build.result }}"
          
          if [ "${{ needs.format.result }}" != "success" ] || \
             [ "${{ needs.clippy.result }}" != "success" ] || \
             [ "${{ needs.build.result }}" != "success" ] || \
             [ "${{ needs.docker-build.result }}" != "success" ]; then
            echo "❌ CI Pipeline Failed"
            exit 1
          fi
          
          echo "✅ All CI jobs passed successfully!"