##############################################################################
# M3DB Node — Headless Service (for StatefulSet DNS)
##############################################################################

apiVersion: v1
kind: Service
metadata:
  name: m3dbnode
  namespace: m3db
  labels:
    app.kubernetes.io/name: m3dbnode
    app.kubernetes.io/part-of: m3db
spec:
  clusterIP: None
  ports:
    - name: client
      port: 9000
      targetPort: 9000
    - name: cluster
      port: 9001
      targetPort: 9001
    - name: http-node
      port: 9002
      targetPort: 9002
    - name: http-cluster
      port: 9003
      targetPort: 9003
    - name: debug
      port: 9004
      targetPort: 9004
    - name: coordinator
      port: 7201
      targetPort: 7201
  selector:
    app.kubernetes.io/name: m3dbnode

---

##############################################################################
# M3DB Node StatefulSet
# 3 replicas — one per availability zone / node for HA
##############################################################################

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: m3dbnode
  namespace: m3db
  labels:
    app.kubernetes.io/name: m3dbnode
    app.kubernetes.io/part-of: m3db
spec:
  serviceName: m3dbnode
  replicas: 3
  podManagementPolicy: Parallel
  selector:
    matchLabels:
      app.kubernetes.io/name: m3dbnode
  template:
    metadata:
      labels:
        app.kubernetes.io/name: m3dbnode
        app.kubernetes.io/part-of: m3db
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "7203"
    spec:
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
            - weight: 100
              podAffinityTerm:
                labelSelector:
                  matchExpressions:
                    - key: app.kubernetes.io/name
                      operator: In
                      values:
                        - m3dbnode
                topologyKey: kubernetes.io/hostname
      securityContext:
        fsGroup: 65534
      terminationGracePeriodSeconds: 120
      containers:
        - name: m3dbnode
          image: quay.io/m3db/m3dbnode:v1.5.0
          imagePullPolicy: IfNotPresent
          args:
            - "-f"
            - "/etc/m3db/m3dbnode.yml"
          ports:
            - containerPort: 9000
              name: client
            - containerPort: 9001
              name: cluster
            - containerPort: 9002
              name: http-node
            - containerPort: 9003
              name: http-cluster
            - containerPort: 9004
              name: debug
            - containerPort: 7201
              name: coordinator
            - containerPort: 7203
              name: metrics
          volumeMounts:
            - name: m3db-data
              mountPath: /var/lib/m3db
            - name: m3db-config
              mountPath: /etc/m3db
            - name: cache-dir
              mountPath: /var/lib/m3kv
          resources:
            requests:
              cpu: "1"
              memory: 4Gi
            limits:
              cpu: "2"
              memory: 8Gi
          livenessProbe:
            httpGet:
              path: /health
              port: 9002
            initialDelaySeconds: 60
            periodSeconds: 15
            timeoutSeconds: 5
            failureThreshold: 5
          readinessProbe:
            httpGet:
              path: /health
              port: 9002
            initialDelaySeconds: 30
            periodSeconds: 10
            timeoutSeconds: 5
            failureThreshold: 3
          lifecycle:
            preStop:
              exec:
                command:
                  - /bin/sh
                  - -c
                  - "sleep 30"   # allow in-flight writes to drain
      volumes:
        - name: m3db-config
          configMap:
            name: m3db-config
        - name: cache-dir
          emptyDir: {}
  volumeClaimTemplates:
    - metadata:
        name: m3db-data
      spec:
        storageClassName: vultr-block-storage-m3db
        accessModes: ["ReadWriteOnce"]
        resources:
          requests:
            storage: 100Gi         # Adjust based on retention & cardinality