# Complete GitHub Actions CI/CD Pipeline Example
# This pipeline builds, tests, and deploys a containerized application

name: CI/CD Pipeline

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

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}
  KUBE_NAMESPACE: production

jobs:
  # Lint and validate
  lint:
    name: Lint Code
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Run linters
        run: |
          echo "Running code linters..."
          # Add your linting commands here

  # Build and test
  build:
    name: Build and Test
    runs-on: ubuntu-latest
    needs: lint

    permissions:
      contents: read
      packages: write

    steps:
      - uses: actions/checkout@v4

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

      - name: Log in to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=sha,prefix={{branch}}-

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

      - name: Run tests
        run: |
          echo "Running unit tests..."
          # Add your test commands here

  # Security scanning
  security:
    name: Security Scan
    runs-on: ubuntu-latest
    needs: build
    if: github.event_name != 'pull_request'

    steps:
      - uses: actions/checkout@v4

      - name: Run Trivy vulnerability scanner
        uses: aquasecurity/trivy-action@master
        with:
          image-ref: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}
          format: 'sarif'
          output: 'trivy-results.sarif'

      - name: Upload Trivy results to GitHub Security
        uses: github/codeql-action/upload-sarif@v2
        with:
          sarif_file: 'trivy-results.sarif'

  # Deploy to staging
  deploy-staging:
    name: Deploy to Staging
    runs-on: ubuntu-latest
    needs: [build, security]
    if: github.ref == 'refs/heads/develop'
    environment:
      name: staging
      url: https://staging.example.com

    steps:
      - uses: actions/checkout@v4

      - name: Configure kubectl
        uses: azure/k8s-set-context@v3
        with:
          method: kubeconfig
          kubeconfig: ${{ secrets.KUBE_CONFIG_STAGING }}

      - name: Deploy to Kubernetes
        run: |
          kubectl set image deployment/app \
            app=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }} \
            -n staging
          kubectl rollout status deployment/app -n staging --timeout=5m

  # Deploy to production
  deploy-production:
    name: Deploy to Production
    runs-on: ubuntu-latest
    needs: [build, security]
    if: github.ref == 'refs/heads/main'
    environment:
      name: production
      url: https://app.example.com

    steps:
      - uses: actions/checkout@v4

      - name: Configure kubectl
        uses: azure/k8s-set-context@v3
        with:
          method: kubeconfig
          kubeconfig: ${{ secrets.KUBE_CONFIG_PROD }}

      - name: Deploy to Kubernetes
        run: |
          kubectl set image deployment/app \
            app=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }} \
            -n ${{ env.KUBE_NAMESPACE }}
          kubectl rollout status deployment/app -n ${{ env.KUBE_NAMESPACE }} --timeout=10m

      - name: Verify deployment
        run: |
          kubectl get deployment app -n ${{ env.KUBE_NAMESPACE }}
          kubectl get pods -n ${{ env.KUBE_NAMESPACE }} -l app=example-app

  # Notify on failure
  notify:
    name: Notify on Failure
    runs-on: ubuntu-latest
    needs: [deploy-staging, deploy-production]
    if: failure()

    steps:
      - name: Send notification
        run: |
          echo "Deployment failed! Sending notification..."
          # Add your notification logic here (Slack, email, etc.)