# =============================================
# PersistentVolume — PostgreSQL data storage
# Host-path volume that stores database files.
# =============================================
apiVersion: v1
kind: PersistentVolume
metadata:
  name: postgres-pv
  labels:
    app: postgres
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: manual
  hostPath:
    path: /mnt/taskmanager/postgres

---
# =============================================
# PersistentVolumeClaim — PostgreSQL
# Binds to postgres-pv for database storage.
# =============================================
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: postgres-pvc
  namespace: taskmanager
  labels:
    app: postgres
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: manual
  resources:
    requests:
      storage: 1Gi

---
# =============================================
# PersistentVolume — Redis data storage
# Host-path volume for Redis append-only file.
# =============================================
apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv
  labels:
    app: redis
spec:
  capacity:
    storage: 500Mi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: manual
  hostPath:
    path: /mnt/taskmanager/redis

---
# =============================================
# PersistentVolumeClaim — Redis
# Binds to redis-pv for cache persistence.
# =============================================
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: redis-pvc
  namespace: taskmanager
  labels:
    app: redis
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: manual
  resources:
    requests:
      storage: 500Mi

---
# =============================================
# StatefulSet — PostgreSQL 16
# Manages the primary relational database.
# Uses the PVC above for persistent storage.
# The init.sql ConfigMap is mounted so the DB
# schema is created automatically on first run.
# =============================================
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: postgres
  namespace: taskmanager
  labels:
    app: postgres
spec:
  serviceName: postgres
  replicas: 1
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
        - name: postgres
          image: postgres:16-alpine
          ports:
            - containerPort: 5432
          env:
            - name: POSTGRES_DB
              value: taskmanager
            - name: POSTGRES_USER
              valueFrom:
                secretKeyRef:
                  name: postgres-secret
                  key: username
            - name: POSTGRES_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: postgres-secret
                  key: password
          volumeMounts:
            - name: postgres-data
              mountPath: /var/lib/postgresql/data
            - name: init-sql
              mountPath: /docker-entrypoint-initdb.d/init.sql
              subPath: init.sql
          readinessProbe:
            exec:
              command:
                - pg_isready
                - -U
                - taskuser
                - -d
                - taskmanager
            initialDelaySeconds: 10
            periodSeconds: 5
          livenessProbe:
            exec:
              command:
                - pg_isready
                - -U
                - taskuser
                - -d
                - taskmanager
            initialDelaySeconds: 30
            periodSeconds: 10
          resources:
            requests:
              memory: "128Mi"
              cpu: "100m"
            limits:
              memory: "512Mi"
              cpu: "500m"
      volumes:
        - name: postgres-data
          persistentVolumeClaim:
            claimName: postgres-pvc
        - name: init-sql
          configMap:
            name: postgres-init

---
# =============================================
# StatefulSet — Redis 7
# Manages the in-memory caching layer.
# Uses the redis-pvc for AOF persistence.
# =============================================
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: redis
  namespace: taskmanager
  labels:
    app: redis
spec:
  serviceName: redis
  replicas: 1
  selector:
    matchLabels:
      app: redis
  template:
    metadata:
      labels:
        app: redis
    spec:
      containers:
        - name: redis
          image: redis:7-alpine
          args: ["redis-server", "--appendonly", "yes"]
          ports:
            - containerPort: 6379
          volumeMounts:
            - name: redis-data
              mountPath: /data
          readinessProbe:
            exec:
              command: ["redis-cli", "ping"]
            initialDelaySeconds: 5
            periodSeconds: 5
          livenessProbe:
            exec:
              command: ["redis-cli", "ping"]
            initialDelaySeconds: 15
            periodSeconds: 10
          resources:
            requests:
              memory: "64Mi"
              cpu: "50m"
            limits:
              memory: "256Mi"
              cpu: "200m"
      volumes:
        - name: redis-data
          persistentVolumeClaim:
            claimName: redis-pvc