name: Deploy to Production

on:
  workflow_dispatch:
    inputs:
      image_tag:
        description: 'Image tag to deploy (default: latest)'
        required: false
        default: 'latest'
      confirmation:
        description: 'Type "DEPLOY" to confirm production deployment'
        required: true
      source_environment:
        description: 'Source environment (staging or manual)'
        required: false
        default: 'staging'
  workflow_run:
    workflows: ["Deploy to Staging"]
    types:
      - completed
    branches: [ main, master ]

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

jobs:
  deploy-prod:
    name: Deploy to Production
    runs-on: ubuntu-latest
    if: |
      (github.event_name == 'workflow_dispatch' && github.event.inputs.confirmation == 'DEPLOY') ||
      (github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'success')
    
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4

    - name: Set image tag
      run: |
        if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
          IMAGE_TAG="${{ github.event.inputs.image_tag || 'latest' }}"
        else
          # For auto-promotion, use the latest successful build
          IMAGE_TAG="main-$(echo "${{ github.sha }}" | cut -c1-7)"
        fi
        echo "IMAGE_TAG=$IMAGE_TAG" >> $GITHUB_ENV
        echo "Deploying image: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:$IMAGE_TAG"

    - name: Deploy to production via webhook (Blue-Green)
      run: |
        echo "🚀 Triggering blue-green webhook deployment to production..."
        
        # Prepare deployment payload
        PAYLOAD=$(cat <<EOF
        {
          "environment": "production",
          "image": "${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }}",
          "namespace": "game-2048-prod",
          "service_name": "game-2048-prod",
          "deployment_id": "${{ github.run_id }}-${{ github.run_attempt }}",
          "commit_sha": "${{ github.sha }}",
          "triggered_by": "${{ github.actor }}",
          "timestamp": "$(date -u +%Y-%m-%dT%H:%M:%SZ)",
          "auto_promotion": "${{ github.event_name == 'workflow_run' }}",
          "deployment_strategy": "blue-green",
          "traffic_split": {
            "initial": 10,
            "intermediate": 50,
            "final": 100
          }
        }
        EOF
        )
        
        # Generate HMAC signature for webhook security
        SIGNATURE=$(echo -n "$PAYLOAD" | openssl dgst -sha256 -hmac "${{ secrets.WEBHOOK_SECRET }}" -binary | base64)
        
        # Send webhook
        HTTP_CODE=$(curl -s -o /tmp/webhook_response.json -w "%{http_code}" \
          -X POST \
          -H "Content-Type: application/json" \
          -H "X-Signature-SHA256: sha256=$SIGNATURE" \
          -H "X-GitHub-Event: deployment" \
          -H "X-GitHub-Delivery: ${{ github.run_id }}" \
          -d "$PAYLOAD" \
          "${{ secrets.PROD_WEBHOOK_URL }}")
        
        echo "Webhook response code: $HTTP_CODE"
        cat /tmp/webhook_response.json || echo "No response body"
        
        if [ "$HTTP_CODE" -ge 200 ] && [ "$HTTP_CODE" -lt 300 ]; then
          echo "✅ Webhook deployment triggered successfully!"
        else
          echo "❌ Webhook deployment failed with code: $HTTP_CODE"
          exit 1
        fi

    - name: Wait for blue-green deployment phases
      run: |
        echo "⏳ Waiting for blue-green deployment phases..."
        echo "Phase 1: Initial deployment (10% traffic) - 2 minutes"
        sleep 120
        
        echo "Phase 2: Intermediate traffic split (50%) - 2 minutes"
        sleep 120
        
        echo "Phase 3: Full traffic switch (100%) - 1 minute"
        sleep 60
        
        echo "✅ Blue-green deployment phases completed"

    - name: Production health check
      run: |
        echo "🏥 Performing comprehensive production health check..."
        MAX_RETRIES=10
        RETRY_COUNT=0
        
        # Get the canonical Knative domain for health check
        HEALTH_URL="https://game-2048-prod.game-2048-prod.${{ secrets.KNATIVE_DOMAIN }}"
        
        while [ $RETRY_COUNT -lt $MAX_RETRIES ]; do
          echo "Attempt $((RETRY_COUNT + 1))/$MAX_RETRIES - Checking: $HEALTH_URL"
          
          # Check if service responds
          if curl -f -s --max-time 10 "$HEALTH_URL" > /dev/null; then
            echo "✅ Basic health check passed!"
            
            # Additional production validations
            echo "🔍 Running extended production validations..."
            
            # Check response time
            RESPONSE_TIME=$(curl -o /dev/null -s -w '%{time_total}' "$HEALTH_URL")
            echo "Response time: ${RESPONSE_TIME}s"
            
            # Check if response contains expected content
            if curl -s --max-time 10 "$HEALTH_URL" | grep -q "2048"; then
              echo "✅ Content validation passed!"
              echo "🌐 Production application is live at: $HEALTH_URL"
              exit 0
            else
              echo "⚠️ Content validation failed, retrying..."
            fi
          else
            echo "⚠️ Health check failed, retrying in 20 seconds..."
            sleep 20
            RETRY_COUNT=$((RETRY_COUNT + 1))
          fi
        done
        
        echo "❌ Production health check failed after $MAX_RETRIES attempts"
        echo "The deployment webhook was sent successfully, but the service is not responding correctly"
        echo "Please check your cluster logs and consider rolling back"
        exit 1

    - name: Production deployment summary
      if: always()
      run: |
        echo "## 🚀 Production Deployment Summary" >> $GITHUB_STEP_SUMMARY
        echo "- **Environment:** Production" >> $GITHUB_STEP_SUMMARY
        echo "- **Image:** \`${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }}\`" >> $GITHUB_STEP_SUMMARY
        echo "- **Deployment Method:** Webhook-based Blue-Green" >> $GITHUB_STEP_SUMMARY
        echo "- **Strategy:** 10% → 50% → 100% traffic split" >> $GITHUB_STEP_SUMMARY
        echo "- **Triggered by:** ${{ github.actor }}" >> $GITHUB_STEP_SUMMARY
        echo "- **Commit:** ${{ github.sha }}" >> $GITHUB_STEP_SUMMARY
        
        if [ "${{ github.event_name }}" = "workflow_run" ]; then
          echo "- **Type:** Auto-promotion from Staging" >> $GITHUB_STEP_SUMMARY
        else
          echo "- **Type:** Manual deployment with confirmation" >> $GITHUB_STEP_SUMMARY
        fi
        
        if [ "${{ job.status }}" = "success" ]; then
          echo "- **Status:** ✅ **LIVE IN PRODUCTION**" >> $GITHUB_STEP_SUMMARY
          echo "- **URL:** https://game-2048-prod.game-2048-prod.${{ secrets.KNATIVE_DOMAIN }}" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "### 🎉 Production is Live!" >> $GITHUB_STEP_SUMMARY
          echo "- 🎮 [Play the game](https://game-2048-prod.game-2048-prod.${{ secrets.KNATIVE_DOMAIN }})" >> $GITHUB_STEP_SUMMARY
          echo "- 🧪 [Run smoke tests](https://github.com/${{ github.repository }}/actions/workflows/smoke-test.yml)" >> $GITHUB_STEP_SUMMARY
        else
          echo "- **Status:** ❌ Failed" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "### ⚠️ Production Deployment Failed" >> $GITHUB_STEP_SUMMARY
          echo "Please check the logs and consider manual intervention or rollback." >> $GITHUB_STEP_SUMMARY
        fi