/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * SPDX-License-Identifier: MIT-0
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this
 * software and associated documentation files (the "Software"), to deal in the Software
 * without restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

terraform {
  required_version = ">= 1.0.1"

  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = ">= 3.66.0"
    }
    kubernetes = {
      source  = "hashicorp/kubernetes"
      version = ">= 2.6.1"
    }
    helm = {
      source  = "hashicorp/helm"
      version = ">= 2.4.1"
    }
  }
}

provider "aws" {
  region = data.aws_region.current.id
  alias  = "default"
}

data "aws_region" "current" {}

data "aws_availability_zones" "available" {}

locals {
  tenant      = "aws001"  # AWS account name or unique id for tenant
  environment = "preprod" # Environment area eg., preprod or prod
  zone        = "test"    # Environment with in one sub_tenant or business unit

  vpc_cidr       = "10.1.0.0/16"
  vpc_name       = join("-", [local.tenant, local.environment, local.zone, "vpc"])
  eks_cluster_id = join("-", [local.tenant, local.environment, local.zone, "eks"])

  terraform_version = "Terraform v1.0.1"
}

module "aws_vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "v3.2.0"

  name = local.vpc_name
  cidr = local.vpc_cidr
  azs  = data.aws_availability_zones.available.names

  public_subnets  = [for k, v in slice(data.aws_availability_zones.available.names, 0, 3) : cidrsubnet(local.vpc_cidr, 8, k)]
  private_subnets = [for k, v in slice(data.aws_availability_zones.available.names, 0, 3) : cidrsubnet(local.vpc_cidr, 8, k + 10)]

  enable_nat_gateway   = true
  create_igw           = true
  enable_dns_hostnames = true
  single_nat_gateway   = true

  public_subnet_tags = {
    "kubernetes.io/cluster/${local.eks_cluster_id}" = "shared"
    "kubernetes.io/role/elb"                        = "1"
  }

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

}