---
# ============================================================
# OPTIM AI BRE Engine - Kubernetes Manifests
# Production-grade deployment with HPA, PodDisruptionBudget
# ============================================================

apiVersion: v1
kind: Namespace
metadata:
  name: optimai-bre
  labels:
    app.kubernetes.io/name: optimai-bre
    environment: production

---
# ============================================================
# CONFIGMAP
# ============================================================
apiVersion: v1
kind: ConfigMap
metadata:
  name: bre-config
  namespace: optimai-bre
data:
  ASPNETCORE_ENVIRONMENT: "Production"
  ASPNETCORE_URLS: "http://+:8080"
  AiOptions__UseAzureOpenAI: "true"
  AiOptions__ModelName: "gpt-4o"
  Serilog__MinimumLevel__Default: "Information"

---
# ============================================================
# SECRETS (use Sealed Secrets or Azure Key Vault in prod)
# ============================================================
apiVersion: v1
kind: Secret
metadata:
  name: bre-secrets
  namespace: optimai-bre
type: Opaque
stringData:
  postgres-connection: "Host=postgres-service;Database=optimai_bre;Username=optimai;Password=CHANGE_ME"
  redis-connection: "redis-service:6379,password=CHANGE_ME"
  jwt-secret-key: "CHANGE_ME_TO_STRONG_RANDOM_KEY_MIN_32_CHARS"
  azure-openai-endpoint: "https://your-resource.openai.azure.com/"
  azure-openai-key: "CHANGE_ME"

---
# ============================================================
# BRE GATEWAY DEPLOYMENT
# ============================================================
apiVersion: apps/v1
kind: Deployment
metadata:
  name: bre-gateway
  namespace: optimai-bre
  labels:
    app: bre-gateway
    version: "1.0.0"
spec:
  replicas: 3
  selector:
    matchLabels:
      app: bre-gateway
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
  template:
    metadata:
      labels:
        app: bre-gateway
        version: "1.0.0"
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "8080"
        prometheus.io/path: "/metrics"
    spec:
      terminationGracePeriodSeconds: 30
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: app
                    operator: In
                    values:
                      - bre-gateway
              topologyKey: kubernetes.io/hostname
      containers:
        - name: bre-gateway
          image: optimai/bre-gateway:1.0.0
          imagePullPolicy: Always
          ports:
            - containerPort: 8080
              name: http
          env:
            - name: ConnectionStrings__PostgreSQL
              valueFrom:
                secretKeyRef:
                  name: bre-secrets
                  key: postgres-connection
            - name: ConnectionStrings__Redis
              valueFrom:
                secretKeyRef:
                  name: bre-secrets
                  key: redis-connection
            - name: Jwt__SecretKey
              valueFrom:
                secretKeyRef:
                  name: bre-secrets
                  key: jwt-secret-key
            - name: AiOptions__Endpoint
              valueFrom:
                secretKeyRef:
                  name: bre-secrets
                  key: azure-openai-endpoint
            - name: AiOptions__ApiKey
              valueFrom:
                secretKeyRef:
                  name: bre-secrets
                  key: azure-openai-key
          envFrom:
            - configMapRef:
                name: bre-config
          resources:
            requests:
              memory: "256Mi"
              cpu: "250m"
            limits:
              memory: "512Mi"
              cpu: "1000m"
          readinessProbe:
            httpGet:
              path: /health/ready
              port: 8080
            initialDelaySeconds: 20
            periodSeconds: 10
            failureThreshold: 3
          livenessProbe:
            httpGet:
              path: /health
              port: 8080
            initialDelaySeconds: 30
            periodSeconds: 30
            failureThreshold: 3
          lifecycle:
            preStop:
              exec:
                command: ["/bin/sh", "-c", "sleep 5"]
          volumeMounts:
            - name: logs
              mountPath: /app/logs
      volumes:
        - name: logs
          emptyDir: {}

---
# ============================================================
# BRE GATEWAY SERVICE
# ============================================================
apiVersion: v1
kind: Service
metadata:
  name: bre-gateway-service
  namespace: optimai-bre
  labels:
    app: bre-gateway
spec:
  type: ClusterIP
  selector:
    app: bre-gateway
  ports:
    - port: 80
      targetPort: 8080
      name: http

---
# ============================================================
# HORIZONTAL POD AUTOSCALER
# ============================================================
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: bre-gateway-hpa
  namespace: optimai-bre
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: bre-gateway
  minReplicas: 3
  maxReplicas: 20
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 70
    - type: Resource
      resource:
        name: memory
        target:
          type: Utilization
          averageUtilization: 80
  behavior:
    scaleUp:
      stabilizationWindowSeconds: 60
      policies:
        - type: Pods
          value: 2
          periodSeconds: 60
    scaleDown:
      stabilizationWindowSeconds: 300
      policies:
        - type: Pods
          value: 1
          periodSeconds: 120

---
# ============================================================
# POD DISRUPTION BUDGET
# ============================================================
apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: bre-gateway-pdb
  namespace: optimai-bre
spec:
  minAvailable: 2
  selector:
    matchLabels:
      app: bre-gateway

---
# ============================================================
# FRONTEND DEPLOYMENT
# ============================================================
apiVersion: apps/v1
kind: Deployment
metadata:
  name: bre-frontend
  namespace: optimai-bre
spec:
  replicas: 2
  selector:
    matchLabels:
      app: bre-frontend
  template:
    metadata:
      labels:
        app: bre-frontend
    spec:
      containers:
        - name: bre-frontend
          image: optimai/bre-frontend:1.0.0
          ports:
            - containerPort: 3000
          env:
            - name: NEXT_PUBLIC_API_URL
              value: "https://api.optimaibre.com/api/v1"
          resources:
            requests:
              memory: "128Mi"
              cpu: "100m"
            limits:
              memory: "256Mi"
              cpu: "500m"
          readinessProbe:
            httpGet:
              path: /api/health
              port: 3000
            initialDelaySeconds: 15
            periodSeconds: 10

---
apiVersion: v1
kind: Service
metadata:
  name: bre-frontend-service
  namespace: optimai-bre
spec:
  type: ClusterIP
  selector:
    app: bre-frontend
  ports:
    - port: 80
      targetPort: 3000

---
# ============================================================
# INGRESS (NGINX / Azure Application Gateway)
# ============================================================
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: bre-ingress
  namespace: optimai-bre
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/ssl-redirect: "true"
    nginx.ingress.kubernetes.io/proxy-body-size: "10m"
    nginx.ingress.kubernetes.io/proxy-read-timeout: "60"
    nginx.ingress.kubernetes.io/rate-limit: "1000"
    nginx.ingress.kubernetes.io/rate-limit-window: "1m"
    cert-manager.io/cluster-issuer: letsencrypt-prod
spec:
  tls:
    - hosts:
        - api.optimaibre.com
        - app.optimaibre.com
      secretName: bre-tls-secret
  rules:
    - host: api.optimaibre.com
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: bre-gateway-service
                port:
                  number: 80
    - host: app.optimaibre.com
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: bre-frontend-service
                port:
                  number: 80

---
# ============================================================
# POSTGRESQL StatefulSet
# ============================================================
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: postgres
  namespace: optimai-bre
spec:
  serviceName: postgres-service
  replicas: 1
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
        - name: postgres
          image: postgres:15-alpine
          env:
            - name: POSTGRES_DB
              value: optimai_bre
            - name: POSTGRES_USER
              value: optimai
            - name: POSTGRES_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: bre-secrets
                  key: postgres-password
            - name: PGDATA
              value: /var/lib/postgresql/data/pgdata
          ports:
            - containerPort: 5432
          resources:
            requests:
              memory: "512Mi"
              cpu: "500m"
            limits:
              memory: "2Gi"
              cpu: "2000m"
          volumeMounts:
            - name: postgres-data
              mountPath: /var/lib/postgresql/data
          readinessProbe:
            exec:
              command: ["pg_isready", "-U", "optimai", "-d", "optimai_bre"]
            initialDelaySeconds: 10
            periodSeconds: 5
  volumeClaimTemplates:
    - metadata:
        name: postgres-data
      spec:
        accessModes: ["ReadWriteOnce"]
        storageClassName: "managed-premium"
        resources:
          requests:
            storage: 100Gi

---
apiVersion: v1
kind: Service
metadata:
  name: postgres-service
  namespace: optimai-bre
spec:
  clusterIP: None
  selector:
    app: postgres
  ports:
    - port: 5432

---
# ============================================================
# REDIS StatefulSet
# ============================================================
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: redis
  namespace: optimai-bre
spec:
  serviceName: redis-service
  replicas: 1
  selector:
    matchLabels:
      app: redis
  template:
    metadata:
      labels:
        app: redis
    spec:
      containers:
        - name: redis
          image: redis:7-alpine
          command:
            - redis-server
            - --requirepass
            - $(REDIS_PASSWORD)
            - --maxmemory
            - 512mb
            - --maxmemory-policy
            - allkeys-lru
          env:
            - name: REDIS_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: bre-secrets
                  key: redis-password
          ports:
            - containerPort: 6379
          resources:
            requests:
              memory: "256Mi"
              cpu: "100m"
            limits:
              memory: "512Mi"
              cpu: "500m"
          volumeMounts:
            - name: redis-data
              mountPath: /data
  volumeClaimTemplates:
    - metadata:
        name: redis-data
      spec:
        accessModes: ["ReadWriteOnce"]
        resources:
          requests:
            storage: 10Gi

---
apiVersion: v1
kind: Service
metadata:
  name: redis-service
  namespace: optimai-bre
spec:
  clusterIP: None
  selector:
    app: redis
  ports:
    - port: 6379