# =============================================================================
# GAMILIT Backend - Horizontal Pod Autoscaler
# =============================================================================
# Purpose: Automatically scale backend pods based on CPU/Memory usage
# Min Replicas: 3
# Max Replicas: 10
# Target CPU: 70%
# Target Memory: 80%
# =============================================================================

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: gamilit-backend-hpa
  namespace: gamilit-production
  labels:
    app: gamilit
    component: backend
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: gamilit-backend

  minReplicas: 3
  maxReplicas: 10

  metrics:
    # CPU-based scaling
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 70

    # Memory-based scaling
    - type: Resource
      resource:
        name: memory
        target:
          type: Utilization
          averageUtilization: 80

  behavior:
    scaleDown:
      stabilizationWindowSeconds: 300  # Wait 5 minutes before scaling down
      policies:
        - type: Percent
          value: 50                     # Scale down max 50% of pods at a time
          periodSeconds: 60
        - type: Pods
          value: 1                      # Or scale down max 1 pod at a time
          periodSeconds: 60
      selectPolicy: Min

    scaleUp:
      stabilizationWindowSeconds: 0    # Scale up immediately
      policies:
        - type: Percent
          value: 100                    # Scale up max 100% of pods at a time
          periodSeconds: 30
        - type: Pods
          value: 2                      # Or scale up max 2 pods at a time
          periodSeconds: 30
      selectPolicy: Max