variable "name" {
  description = "Base name used for created resources."
  type        = string
}

variable "region" {
  description = "AWS region for informational outputs and examples."
  type        = string
}

variable "kubernetes_version" {
  description = "EKS Kubernetes version."
  type        = string
  default     = "1.35"
}

variable "vpc_cidr" {
  description = "CIDR block for the new VPC."
  type        = string
  default     = "10.0.0.0/16"
}

variable "create_vpc" {
  description = "Whether to create a new VPC and subnets. Set to false to use existing networking."
  type        = bool
  default     = true
}

variable "existing_vpc_id" {
  description = "Existing VPC ID to use when create_vpc is false."
  type        = string
  default     = null
  nullable    = true

  validation {
    condition     = var.create_vpc || var.existing_vpc_id != null
    error_message = "existing_vpc_id must be set when create_vpc is false."
  }
}

variable "existing_public_subnet_ids" {
  description = "Existing public subnet IDs to use when create_vpc is false."
  type        = list(string)
  default     = []
}

variable "existing_private_subnet_ids" {
  description = "Existing private subnet IDs to use when create_vpc is false."
  type        = list(string)
  default     = []

  validation {
    condition     = var.create_vpc || length(var.existing_private_subnet_ids) >= 2
    error_message = "At least two existing_private_subnet_ids must be provided when create_vpc is false."
  }
}

variable "availability_zone_count" {
  description = "How many availability zones to spread the cluster across."
  type        = number
  default     = 2

  validation {
    condition     = var.availability_zone_count >= 2
    error_message = "availability_zone_count must be at least 2."
  }
}

variable "single_nat_gateway" {
  description = "Whether to create one shared NAT gateway instead of one per private subnet AZ."
  type        = bool
  default     = true
}

variable "cluster_endpoint_public_access" {
  description = "Whether the EKS API server endpoint is publicly accessible."
  type        = bool
  default     = true
}

variable "cluster_endpoint_private_access" {
  description = "Whether the EKS API server endpoint is privately accessible."
  type        = bool
  default     = true
}

variable "cluster_public_access_cidrs" {
  description = "CIDR ranges allowed to access the public EKS API endpoint."
  type        = list(string)
  default     = ["0.0.0.0/0"]
}

variable "node_instance_types" {
  description = "EC2 instance types for the managed node group."
  type        = list(string)
  default     = ["t3.medium"]
}

variable "node_capacity_type" {
  description = "Capacity type for the managed node group."
  type        = string
  default     = "ON_DEMAND"

  validation {
    condition     = contains(["ON_DEMAND", "SPOT"], var.node_capacity_type)
    error_message = "node_capacity_type must be ON_DEMAND or SPOT."
  }
}

variable "node_disk_size" {
  description = "Disk size in GiB for worker nodes."
  type        = number
  default     = 20
}

variable "node_desired_size" {
  description = "Desired node count for the managed node group."
  type        = number
  default     = 2
}

variable "node_min_size" {
  description = "Minimum node count for the managed node group."
  type        = number
  default     = 2
}

variable "node_max_size" {
  description = "Maximum node count for the managed node group."
  type        = number
  default     = 4
}

variable "tags" {
  description = "Additional tags to apply to all supported resources."
  type        = map(string)
  default     = {}
}

variable "cluster_admin_principal_arns" {
  description = "Additional IAM principal ARNs to grant EKS cluster-admin access."
  type        = list(string)
  default     = []
}

variable "coredns_addon_version" {
  description = "Optional explicit version for the CoreDNS EKS addon."
  type        = string
  default     = null
  nullable    = true
}

variable "kube_proxy_addon_version" {
  description = "Optional explicit version for the kube-proxy EKS addon."
  type        = string
  default     = null
  nullable    = true
}

variable "vpc_cni_addon_version" {
  description = "Optional explicit version for the VPC CNI EKS addon."
  type        = string
  default     = null
  nullable    = true
}

variable "pod_identity_agent_addon_version" {
  description = "Optional explicit version for the EKS Pod Identity Agent addon."
  type        = string
  default     = null
  nullable    = true
}