name: Deploy Frontend

on:
  push:
    branches: [ main ]
    paths:
      - 'frontend/**'
      - '.github/workflows/cd-frontend.yml'
  workflow_dispatch:

env:
  GCP_PROJECT_ID: ${{ secrets.GCP_PROJECT_ID }}
  GCP_REGION: us-central1
  BUCKET_NAME: ${{ secrets.FRONTEND_BUCKET_NAME }}
  CDN_URL_MAP: accessible-video-frontend
  NODE_VERSION: "20"

jobs:
  build-and-deploy:
    name: Build and Deploy Frontend
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/main'

    permissions:
      contents: read
      id-token: write

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

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

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

    - name: Build for production
      working-directory: ./frontend
      env:
        VITE_API_BASE_URL: ${{ secrets.PRODUCTION_API_URL }}
        VITE_APP_ENV: production
        VITE_SENTRY_DSN: ${{ secrets.FRONTEND_SENTRY_DSN }}
      run: npm run build

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

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

    - name: Deploy to Cloud Storage
      working-directory: ./frontend
      run: |
        # Sync build files to Cloud Storage bucket
        gsutil -m rsync -r -d dist/ gs://${{ env.BUCKET_NAME }}/
        
        # Set public read permissions for web assets
        gsutil -m acl ch -r -u AllUsers:R gs://${{ env.BUCKET_NAME }}
        
        # Set cache headers for different file types
        gsutil -m setmeta -h "Cache-Control:public, max-age=31536000, immutable" "gs://${{ env.BUCKET_NAME }}/**/*.js"
        gsutil -m setmeta -h "Cache-Control:public, max-age=31536000, immutable" "gs://${{ env.BUCKET_NAME }}/**/*.css"
        gsutil -m setmeta -h "Cache-Control:public, max-age=86400" "gs://${{ env.BUCKET_NAME }}/**/*.html"
        gsutil -m setmeta -h "Cache-Control:public, max-age=86400" "gs://${{ env.BUCKET_NAME }}/index.html"

    - name: Configure Load Balancer and CDN
      run: |
        # Create backend bucket if it doesn't exist
        gcloud compute backend-buckets describe ${{ env.BUCKET_NAME }}-backend || \
        gcloud compute backend-buckets create ${{ env.BUCKET_NAME }}-backend \
          --gcs-bucket-name=${{ env.BUCKET_NAME }}
        
        # Update the URL map to route to the bucket
        gcloud compute url-maps describe ${{ env.CDN_URL_MAP }} || \
        gcloud compute url-maps create ${{ env.CDN_URL_MAP }} \
          --default-backend-bucket=${{ env.BUCKET_NAME }}-backend
        
        # Create or update HTTPS proxy
        gcloud compute target-https-proxies describe ${{ env.CDN_URL_MAP }}-https-proxy || \
        gcloud compute target-https-proxies create ${{ env.CDN_URL_MAP }}-https-proxy \
          --url-map=${{ env.CDN_URL_MAP }} \
          --ssl-certificates=${{ secrets.SSL_CERT_NAME }}
        
        # Create or update global forwarding rule
        gcloud compute forwarding-rules describe ${{ env.CDN_URL_MAP }}-https-rule --global || \
        gcloud compute forwarding-rules create ${{ env.CDN_URL_MAP }}-https-rule \
          --global \
          --target-https-proxy=${{ env.CDN_URL_MAP }}-https-proxy \
          --ports=443

    - name: Invalidate CDN cache
      run: |
        # Invalidate CDN cache for immediate deployment
        gcloud compute url-maps invalidate-cdn-cache ${{ env.CDN_URL_MAP }} \
          --path="/*" \
          --async

    - name: Run smoke tests
      working-directory: ./frontend
      env:
        FRONTEND_URL: https://${{ secrets.FRONTEND_DOMAIN }}
      run: |
        # Wait a bit for CDN propagation
        sleep 30
        
        # Basic smoke test - check if main page loads
        curl -f -s -o /dev/null -w "%{http_code}" "$FRONTEND_URL" | grep -q "200" || {
          echo "Frontend smoke test failed - main page not accessible"
          exit 1
        }
        
        # Check if assets are loading
        curl -f -s -o /dev/null -w "%{http_code}" "$FRONTEND_URL/assets/" | grep -qE "(200|404)" || {
          echo "Frontend smoke test failed - assets not accessible"
          exit 1
        }
        
        echo "✅ Frontend smoke tests passed"

  notify-deployment:
    name: Notify Deployment Status
    runs-on: ubuntu-latest
    needs: [build-and-deploy]
    if: always()

    steps:
    - name: Notify success
      if: needs.build-and-deploy.result == 'success'
      run: |
        echo "✅ Frontend deployment completed successfully"
        echo "Frontend is now live at: https://${{ secrets.FRONTEND_DOMAIN }}"
        # Add Slack/email notification here if needed

    - name: Notify failure
      if: needs.build-and-deploy.result == 'failure'
      run: |
        echo "❌ Frontend deployment failed"
        # Add Slack/email notification here if needed