name: CI/CD Pipeline

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

env:
  JAVA_VERSION: '21'
  JAVA_DISTRIBUTION: 'temurin'
  GCP_REGION: 'us-central1'

jobs:
  # Job 1: Build and Test
  build-and-test:
    name: Build and Test
    runs-on: ubuntu-latest
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set up JDK ${{ env.JAVA_VERSION }}
        uses: actions/setup-java@v4
        with:
          java-version: ${{ env.JAVA_VERSION }}
          distribution: ${{ env.JAVA_DISTRIBUTION }}
          cache: 'maven'

      - name: Run tests
        run: ./mvnw clean verify -B

      - name: Upload test results
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: test-results
          path: target/surefire-reports/
          retention-days: 30

  # Job 2: Security Scan (Filesystem)
  security-scan:
    name: Security Scan
    runs-on: ubuntu-latest
    needs: build-and-test
    
    permissions:
      contents: read
      security-events: write
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Run Trivy vulnerability scanner
        uses: aquasecurity/trivy-action@master
        with:
          scan-type: 'fs'
          scan-ref: '.'
          format: 'sarif'
          output: 'trivy-results.sarif'
          severity: 'CRITICAL,HIGH'

      - name: Upload Trivy results to GitHub Security
        uses: github/codeql-action/upload-sarif@v3
        if: always()
        with:
          sarif_file: 'trivy-results.sarif'

  # Job 3: Build and Push Docker Image
  build-and-push-image:
    name: Build and Push Docker Image
    runs-on: ubuntu-latest
    needs: [build-and-test, security-scan]
    if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
    
    permissions:
      contents: read
      id-token: write
    
    outputs:
      image-tag: ${{ steps.meta.outputs.tags }}
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

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

      - name: Authenticate to Google Cloud
        id: auth
        uses: google-github-actions/auth@v2
        with:
          workload_identity_provider: ${{ secrets.GCP_WORKLOAD_IDENTITY_PROVIDER }}
          service_account: ${{ secrets.GCP_SERVICE_ACCOUNT }}

      - name: Set up Cloud SDK
        uses: google-github-actions/setup-gcloud@v2

      - name: Configure Docker for GCR
        run: |
          gcloud auth configure-docker ${{ env.GCP_REGION }}-docker.pkg.dev

      - name: Extract metadata for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.GCP_REGION }}-docker.pkg.dev/${{ secrets.GCP_PROJECT_ID }}/petclinic/spring-petclinic
          tags: |
            type=ref,event=branch
            type=sha,prefix={{branch}}-
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ./Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

  # Job 4: Container Security Scan
  scan-image:
    name: Scan Docker Image
    runs-on: ubuntu-latest
    needs: build-and-push-image
    
    permissions:
      contents: read
      security-events: write
    
    steps:
      - name: Authenticate to Google Cloud
        uses: google-github-actions/auth@v2
        with:
          workload_identity_provider: ${{ secrets.GCP_WORKLOAD_IDENTITY_PROVIDER }}
          service_account: ${{ secrets.GCP_SERVICE_ACCOUNT }}

      - name: Set up Cloud SDK
        uses: google-github-actions/setup-gcloud@v2

      - name: Configure Docker
        run: gcloud auth configure-docker ${{ env.GCP_REGION }}-docker.pkg.dev

      - name: Run Trivy vulnerability scanner on image
        uses: aquasecurity/trivy-action@master
        with:
          image-ref: ${{ env.GCP_REGION }}-docker.pkg.dev/${{ secrets.GCP_PROJECT_ID }}/petclinic/spring-petclinic:${{ github.sha }}
          format: 'sarif'
          output: 'trivy-image-results.sarif'
          severity: 'CRITICAL,HIGH'

      - name: Upload Trivy results to GitHub Security
        uses: github/codeql-action/upload-sarif@v3
        if: always()
        with:
          sarif_file: 'trivy-image-results.sarif'

  # Job 5: Deploy to GCP
  deploy:
    name: Deploy to GCP
    runs-on: ubuntu-latest
    needs: [build-and-push-image, scan-image]
    if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
    
    environment:
      name: ${{ github.ref == 'refs/heads/main' && 'production' || 'development' }}
    
    permissions:
      contents: read
      id-token: write
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Authenticate to Google Cloud
        uses: google-github-actions/auth@v2
        with:
          workload_identity_provider: ${{ secrets.GCP_WORKLOAD_IDENTITY_PROVIDER }}
          service_account: ${{ secrets.GCP_SERVICE_ACCOUNT }}

      - name: Set up Cloud SDK
        uses: google-github-actions/setup-gcloud@v2

      - name: Set up Terraform
        uses: hashicorp/setup-terraform@v3
        with:
          terraform_version: 1.6.0

      - name: Determine environment
        id: env
        run: |
          if [ "${{ github.ref }}" == "refs/heads/main" ]; then
            echo "environment=prod" >> $GITHUB_OUTPUT
            echo "min_instances=1" >> $GITHUB_OUTPUT
          else
            echo "environment=dev" >> $GITHUB_OUTPUT
            echo "min_instances=0" >> $GITHUB_OUTPUT
          fi

      - name: Terraform Init
        working-directory: ./terraform
        run: terraform init

      - name: Terraform Plan
        working-directory: ./terraform
        run: |
          terraform plan \
            -var="project_id=${{ secrets.GCP_PROJECT_ID }}" \
            -var="region=${{ env.GCP_REGION }}" \
            -var="environment=${{ steps.env.outputs.environment }}" \
            -var="image_tag=${{ github.sha }}" \
            -var="min_instances=${{ steps.env.outputs.min_instances }}" \
            -out=tfplan

      - name: Terraform Apply
        working-directory: ./terraform
        run: terraform apply -auto-approve tfplan

      - name: Get Cloud Run URL
        id: deploy
        run: |
          URL=$(gcloud run services describe petclinic-${{ steps.env.outputs.environment }} \
            --region=${{ env.GCP_REGION }} \
            --format='value(status.url)')
          echo "url=$URL" >> $GITHUB_OUTPUT

      - name: Run smoke test
        run: |
          sleep 30
          curl -f ${{ steps.deploy.outputs.url }}/actuator/health || exit 1

  # Job 6: Notify
  notify:
    name: Notify
    runs-on: ubuntu-latest
    needs: [deploy]
    if: always()
    
    steps:
      - name: Send notification
        run: |
          echo "Deployment ${{ needs.deploy.result }}"
          echo "Status: ${{ job.status }}"