provider "aws" {
  region = var.region
}

data "aws_availability_zones" "available" {}

locals {
  azs      = slice(data.aws_availability_zones.available.names, 0, 3)
  vpc_cidr = "10.99.0.0/16"

  tags = {
    GithubRepo = "github.com/aws-samples/amazon-eks-custom-amis"
  }
}

################################################################################
# VPC
################################################################################

module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "~> 3.0"

  name = var.name
  cidr = local.vpc_cidr

  azs             = local.azs
  public_subnets  = [for k, v in local.azs : cidrsubnet(local.vpc_cidr, 8, k)]
  private_subnets = [for k, v in local.azs : cidrsubnet(local.vpc_cidr, 8, k + 10)]

  enable_nat_gateway   = true
  single_nat_gateway   = true
  enable_dns_hostnames = true

  # Manage so we can name
  manage_default_network_acl    = true
  default_network_acl_tags      = { Name = "${var.name}-default" }
  manage_default_route_table    = true
  default_route_table_tags      = { Name = "${var.name}-default" }
  manage_default_security_group = true
  default_security_group_tags   = { Name = "${var.name}-default" }

  public_subnet_tags = {
    "kubernetes.io/cluster/${var.name}" = "shared"
    "kubernetes.io/role/elb"            = 1
  }

  private_subnet_tags = {
    "kubernetes.io/cluster/${var.name}" = "shared"
    "kubernetes.io/role/internal-elb"   = 1
  }

  tags = local.tags
}