# VPC Module - Variables
# RFC 0039: ADR-Compliant Foundation Infrastructure

variable "name" {
  description = "Name prefix for all VPC resources"
  type        = string
}

variable "cidr" {
  description = "VPC CIDR block"
  type        = string
  default     = "10.0.0.0/16"

  validation {
    condition     = can(cidrhost(var.cidr, 0))
    error_message = "CIDR block must be a valid IPv4 CIDR."
  }
}

variable "availability_zones" {
  description = "List of availability zones to use (minimum 3 for HA)"
  type        = list(string)

  validation {
    condition     = length(var.availability_zones) >= 3
    error_message = "Minimum 3 availability zones required for HA."
  }
}

variable "enable_nat_gateway" {
  description = "Enable NAT Gateway for private subnet internet access"
  type        = bool
  default     = true
}

variable "single_nat_gateway" {
  description = "Use a single NAT Gateway instead of one per AZ (cost vs HA tradeoff)"
  type        = bool
  default     = false
}

variable "enable_flow_logs" {
  description = "Enable VPC Flow Logs for security auditing"
  type        = bool
  default     = true
}

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