{{/* Chart name */}}
{{- define "redis-cluster.name" -}}
{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
{{- end -}}

{{/* Fully qualified app name */}}
{{- define "redis-cluster.fullname" -}}
{{- if .Values.fullnameOverride -}}
{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" -}}
{{- else -}}
{{- $name := default .Chart.Name .Values.nameOverride -}}
{{- if contains $name .Release.Name -}}
{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
{{- else -}}
{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
{{- end -}}
{{- end -}}
{{- end -}}

{{/* Chart label */}}
{{- define "redis-cluster.chart" -}}
{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
{{- end -}}

{{/* Common labels */}}
{{- define "redis-cluster.labels" -}}
helm.sh/chart: {{ include "redis-cluster.chart" . }}
{{ include "redis-cluster.selectorLabels" . }}
app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
app.kubernetes.io/managed-by: {{ .Release.Service }}
{{- end -}}

{{/* Selector labels */}}
{{- define "redis-cluster.selectorLabels" -}}
app.kubernetes.io/name: {{ include "redis-cluster.name" . }}
app.kubernetes.io/instance: {{ .Release.Name }}
{{- end -}}

{{/*
Headless service DNS name. Deliberately stop at .svc: the cluster DNS suffix is
not necessarily cluster.local, and Kubernetes expands this portable name using
the pod's search domains.
*/}}
{{- define "redis-cluster.headlessFqdn" -}}
{{ include "redis-cluster.fullname" . }}-headless.{{ .Release.Namespace }}.svc
{{- end -}}

{{/* Service account name */}}
{{- define "redis-cluster.serviceAccountName" -}}
{{- if .Values.serviceAccount.create -}}
{{- default (include "redis-cluster.fullname" .) .Values.serviceAccount.name -}}
{{- else -}}
{{- default "default" .Values.serviceAccount.name -}}
{{- end -}}
{{- end -}}

{{/* Secret name holding the password */}}
{{- define "redis-cluster.secretName" -}}
{{- if .Values.auth.existingSecret -}}
{{- .Values.auth.existingSecret -}}
{{- else -}}
{{- include "redis-cluster.fullname" . -}}
{{- end -}}
{{- end -}}

{{/* Secret key holding the password */}}
{{- define "redis-cluster.secretKey" -}}
{{- if .Values.auth.existingSecret -}}
{{- .Values.auth.existingSecretKey -}}
{{- else -}}
redis-password
{{- end -}}
{{- end -}}

{{/*
Password: explicit value wins; otherwise reuse the one already in the cluster
(so upgrades don't rotate it); otherwise generate.
*/}}
{{- define "redis-cluster.password" -}}
{{- if .Values.auth.password -}}
{{- .Values.auth.password -}}
{{- else -}}
{{- $existing := lookup "v1" "Secret" .Release.Namespace (include "redis-cluster.fullname" .) -}}
{{- if and $existing $existing.data (index $existing.data "redis-password") -}}
{{- index $existing.data "redis-password" | b64dec -}}
{{- else -}}
{{- randAlphaNum 24 -}}
{{- end -}}
{{- end -}}
{{- end -}}

{{/* Total Redis nodes: shards * (one primary + replicas per shard). */}}
{{- define "redis-cluster.nodeCount" -}}
{{- mul (int .Values.cluster.shards) (add (int .Values.cluster.replicasPerShard) 1) -}}
{{- end -}}

{{/* Balanced bootstrap Service used by cluster-aware clients. */}}
{{- define "redis-cluster.bootstrapServiceName" -}}
{{- if .Values.externalAccess.enabled -}}
{{- printf "%s-external" (include "redis-cluster.fullname" .) -}}
{{- else -}}
{{- include "redis-cluster.fullname" . -}}
{{- end -}}
{{- end -}}

{{/* RedisInsight resource name. */}}
{{- define "redis-cluster.redisInsightName" -}}
{{- printf "%s-insight" (include "redis-cluster.fullname" .) | trunc 63 | trimSuffix "-" -}}
{{- end -}}

{{/* RedisInsight labels deliberately do not match the Redis pod selector. */}}
{{- define "redis-cluster.redisInsightLabels" -}}
helm.sh/chart: {{ include "redis-cluster.chart" . }}
app.kubernetes.io/name: redisinsight
app.kubernetes.io/instance: {{ .Release.Name }}
app.kubernetes.io/component: insight
app.kubernetes.io/managed-by: {{ .Release.Service }}
{{- end -}}

{{- define "redis-cluster.redisInsightSelectorLabels" -}}
app.kubernetes.io/name: redisinsight
app.kubernetes.io/instance: {{ .Release.Name }}
app.kubernetes.io/component: insight
{{- end -}}

{{/* Environment shared by Redis lifecycle scripts. */}}
{{- define "redis-cluster.commonEnv" -}}
- name: STS_NAME
  value: {{ include "redis-cluster.fullname" . | quote }}
- name: HEADLESS_SERVICE
  value: {{ include "redis-cluster.headlessFqdn" . | quote }}
- name: NODE_COUNT
  value: {{ include "redis-cluster.nodeCount" . | quote }}
- name: SHARD_COUNT
  value: {{ .Values.cluster.shards | quote }}
- name: REPLICAS_PER_SHARD
  value: {{ .Values.cluster.replicasPerShard | quote }}
- name: REDIS_PORT
  value: {{ .Values.redis.port | quote }}
- name: CLUSTER_BUS_PORT
  value: {{ .Values.cluster.busPort | quote }}
{{- if .Values.auth.enabled }}
- name: REDIS_PASSWORD
  valueFrom:
    secretKeyRef:
      name: {{ include "redis-cluster.secretName" . }}
      key: {{ include "redis-cluster.secretKey" . }}
- name: REDISCLI_AUTH
  valueFrom:
    secretKeyRef:
      name: {{ include "redis-cluster.secretName" . }}
      key: {{ include "redis-cluster.secretKey" . }}
{{- end }}
{{- end -}}