variable "datacenters" {
  description = "List of datacenters to deploy to"
  type        = list(string)
  default     = ["dc1"]
}

variable "redis_version" {
  description = "Redis Docker image tag"
  type        = string
  default     = "7-alpine"
}

variable "count" {
  description = "Number of Redis instances to run"
  type        = number
  default     = 1
}

variable "port" {
  description = "Port to expose Redis on (0 for dynamic)"
  type        = number
  default     = 0
}

variable "cpu" {
  description = "CPU allocation in MHz"
  type        = number
  default     = 500
}

variable "memory" {
  description = "Memory allocation in MB"
  type        = number
  default     = 256
}

variable "maxmemory" {
  description = "Redis maxmemory setting (e.g., 200mb)"
  type        = string
  default     = "200mb"
}

variable "maxmemory_policy" {
  description = "Redis eviction policy"
  type        = string
  default     = "allkeys-lru"
}

variable "service_provider" {
  description = "Service discovery provider (nomad or consul)"
  type        = string
  default     = "nomad"
}

job "redis" {
  type        = "service"
  datacenters = var.datacenters

  update {
    max_parallel     = 1
    min_healthy_time = "10s"
    healthy_deadline = "3m"
    auto_revert      = true
  }

  group "redis" {
    count = var.count

    restart {
      attempts = 10
      interval = "5m"
      delay    = "15s"
      mode     = "delay"
    }

    network {
      mode = "bridge"

      port "redis" {
        static = var.port > 0 ? var.port : null
        to     = 6379
      }
    }

    service {
      name     = "redis"
      port     = "redis"
      provider = var.service_provider

      tags = [
        "cache",
        "db",
      ]

      check {
        type     = "tcp"
        interval = "10s"
        timeout  = "2s"
      }
    }

    task "redis" {
      driver = "docker"

      config {
        image = "redis:${var.redis_version}"
        ports = ["redis"]

        args = [
          "redis-server",
          "--maxmemory", var.maxmemory,
          "--maxmemory-policy", var.maxmemory_policy,
          "--appendonly", "yes",
        ]
      }

      resources {
        cpu    = var.cpu
        memory = var.memory
      }
    }
  }
}