module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "~> 5.0"

  name = "${local.name_prefix}-vpc"
  cidr = var.vpc_cidr

  azs             = local.azs
  private_subnets = [for i, az in local.azs : cidrsubnet(var.vpc_cidr, 4, i)]
  public_subnets  = [for i, az in local.azs : cidrsubnet(var.vpc_cidr, 4, i + 4)]

  enable_nat_gateway   = true
  single_nat_gateway   = var.environment != "production"
  enable_dns_hostnames = true
  enable_dns_support   = true

  public_subnet_tags = {
    "kubernetes.io/role/elb" = 1
  }

  private_subnet_tags = {
    "kubernetes.io/role/internal-elb" = 1
  }
}