Load context files:
- DEVELOPMENT_PLAN.md (deployment strategy)
- ARCHITECTURE.md (system components)
- README.md (project overview)
- Security requirements

name: CI/CD Pipeline

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

env:
  NODE_VERSION: '18.x'
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  # ============================================
  # LINT & FORMAT CHECK
  # ============================================
  lint:
    name: Lint and Format Check
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      - name: Run linter
        run: npm run lint

      - name: Check formatting
        run: npm run format:check

  # ============================================
  # BUILD
  # ============================================
  build:
    name: Build Application
    runs-on: ubuntu-latest
    needs: lint
    steps:
      - uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      - name: Build application
        run: npm run build

      - name: Upload build artifacts
        uses: actions/upload-artifact@v4
        with:
          name: build-artifacts
          path: dist/
          retention-days: 7

  # ============================================
  # TEST
  # ============================================
  test:
    name: Run Tests
    runs-on: ubuntu-latest
    needs: lint
    strategy:
      matrix:
        test-type: [unit, integration]
    steps:
      - uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      - name: Run ${{ matrix.test-type }} tests
        run: npm run test:${{ matrix.test-type }}

      - name: Generate coverage report
        if: matrix.test-type == 'unit'
        run: npm run coverage

      - name: Upload coverage to Codecov
        if: matrix.test-type == 'unit'
        uses: codecov/codecov-action@v3
        with:
          files: ./coverage/coverage-final.json
          flags: unittests

  # ============================================
  # SECURITY SCAN
  # ============================================
  security:
    name: Security Scanning
    runs-on: ubuntu-latest
    needs: build
    steps:
      - uses: actions/checkout@v4

      - name: Run dependency audit
        run: npm audit --audit-level=moderate

      - name: Run Snyk security scan
        uses: snyk/actions/node@master
        env:
          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
        with:
          args: --severity-threshold=high

      - name: Run Trivy vulnerability scanner
        uses: aquasecurity/trivy-action@master
        with:
          scan-type: 'fs'
          scan-ref: '.'
          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'

  # ============================================
  # BUILD DOCKER IMAGE
  # ============================================
  docker:
    name: Build and Push Docker Image
    runs-on: ubuntu-latest
    needs: [build, test, security]
    if: github.event_name == 'push'
    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=sha,prefix={{branch}}-
            type=semver,pattern={{version}}

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

  # ============================================
  # DEPLOY TO STAGING
  # ============================================
  deploy-staging:
    name: Deploy to Staging
    runs-on: ubuntu-latest
    needs: docker
    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 }}:develop-${{ github.sha }}
          kubectl rollout status deployment/app

      - name: Run smoke tests
        run: |
          npm run test:smoke -- --url=https://staging.example.com

  # ============================================
  # DEPLOY TO PRODUCTION
  # ============================================
  deploy-production:
    name: Deploy to Production
    runs-on: ubuntu-latest
    needs: docker
    if: github.ref == 'refs/heads/main'
    environment:
      name: production
      url: https://www.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 (Blue-Green)
        run: |
          # Deploy green version
          kubectl apply -f k8s/green-deployment.yaml
          kubectl set image deployment/app-green \
            app=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:main-${{ github.sha }}

          # Wait for rollout
          kubectl rollout status deployment/app-green

          # Run health checks
          kubectl run health-check --rm -i --restart=Never \
            --image=curlimages/curl -- \
            curl http://app-green-service/health

          # Switch traffic to green
          kubectl patch service app-service \
            -p '{"spec":{"selector":{"version":"green"}}}'

          # Delete old blue deployment
          kubectl delete deployment app-blue || true

          # Rename green to blue for next deploy
          kubectl label deployment app-green version=blue --overwrite

      - name: Run production smoke tests
        run: |
          npm run test:smoke -- --url=https://www.example.com

      - name: Notify team
        uses: slackapi/slack-github-action@v1
        with:
          payload: |
            {
              "text": "Production deployment successful!",
              "blocks": [
                {
                  "type": "section",
                  "text": {
                    "type": "mrkdwn",
                    "text": "*Production Deployment Complete* :rocket:\nCommit: ${{ github.sha }}\nAuthor: ${{ github.actor }}"
                  }
                }
              ]
            }
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK }}

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---

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  instance_types = var.node_instance_types
  capacity_type  = "ON_DEMAND"

  labels = {
    role = "general"
  }

  tags = {
    NodeGroup = "general"
  }
}

**Step 2.2: Variables and Environments**

Create `terraform/variables.tf`:

```hcl
variable "environment" {
  description = "Environment name (dev, staging, production)"
  type        = string
}

variable "aws_region" {
  description = "AWS region"
  type        = string
  default     = "us-west-2"
}

variable "project_name" {
  description = "Project name"
  type        = string
}

variable "vpc_cidr" {
  description = "VPC CIDR block"
  type        = string
}

variable "availability_zones" {
  description = "Availability zones"
  type        = list(string)
}

variable "private_subnet_cidrs" {
  description = "Private subnet CIDR blocks"
  type        = list(string)
}

variable "public_subnet_cidrs" {
  description = "Public subnet CIDR blocks"
  type        = list(string)
}

variable "node_desired_size" {
  description = "Desired number of EKS nodes"
  type        = number
  default     = 2
}

variable "node_min_size" {
  description = "Minimum number of EKS nodes"
  type        = number
  default     = 1
}

variable "node_max_size" {
  description = "Maximum number of EKS nodes"
  type        = number
  default     = 5
}

variable "node_instance_types" {
  description = "EKS node instance types"
  type        = list(string)
  default     = ["t3.medium"]
}

variable "db_instance_class" {
  description = "RDS instance class"
  type        = string
  default     = "db.t3.micro"
}

variable "db_allocated_storage" {
  description = "RDS allocated storage (GB)"
  type        = number
  default     = 20
}

variable "db_max_allocated_storage" {
  description = "RDS maximum allocated storage (GB)"
  type        = number
  default     = 100
}

variable "db_name" {
  description = "Database name"
  type        = string
}

variable "db_username" {
  description = "Database username"
  type        = string
}

variable "redis_node_type" {
  description = "ElastiCache Redis node type"
  type        = string
  default     = "cache.t3.micro"
}

undefined

---

global:
  scrape_interval: 15s
  evaluation_interval: 15s
  external_labels:
    cluster: 'production'
    environment: 'prod'

**Step 3.2: Alert Rules**

Create `monitoring/alert-rules.yml`:

```yaml
groups:
  - name: application_alerts
    interval: 30s
    rules:
      # High error rate
      - alert: HighErrorRate
        expr: |
          sum(rate(http_requests_total{status=~"5.."}[5m])) by (service)
          /
          sum(rate(http_requests_total[5m])) by (service)
          > 0.05
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "High error rate detected"
          description: "{{ $labels.service }} has error rate {{ $value | humanizePercentage }}"

      # High response time
      - alert: HighResponseTime
        expr: |
          histogram_quantile(0.95,
            rate(http_request_duration_seconds_bucket[5m])
          ) > 1
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "High response time detected"
          description: "95th percentile response time is {{ $value }}s"

      # Service down
      - alert: ServiceDown
        expr: up{job="application"} == 0
        for: 2m
        labels:
          severity: critical
        annotations:
          summary: "Service is down"
          description: "{{ $labels.instance }} has been down for more than 2 minutes"

  - name: infrastructure_alerts
    interval: 30s
    rules:
      # High CPU usage
      - alert: HighCPUUsage
        expr: |
          100 - (avg by (instance) (rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 80
        for: 10m
        labels:
          severity: warning
        annotations:
          summary: "High CPU usage"
          description: "{{ $labels.instance }} CPU usage is {{ $value }}%"

      # High memory usage
      - alert: HighMemoryUsage
        expr: |
          (1 - (node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes)) * 100 > 85
        for: 10m
        labels:
          severity: warning
        annotations:
          summary: "High memory usage"
          description: "{{ $labels.instance }} memory usage is {{ $value }}%"

      # Disk space running out
      - alert: DiskSpaceLow
        expr: |
          (node_filesystem_avail_bytes{fstype!~"tmpfs"} / node_filesystem_size_bytes{fstype!~"tmpfs"}) * 100 < 15
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "Disk space running low"
          description: "{{ $labels.instance }} disk {{ $labels.mountpoint }} has {{ $value }}% free"

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---