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"
}

terraform {
  backend "local" {
    path = "local_tf_state/terraform-main.tfstate"
  }
}

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        = "dev"     # Environment with in one sub_tenant or business unit

  kubernetes_version = "1.21"

  vpc_cidr       = "10.0.0.0/16"
  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 data.aws_availability_zones.available.names : cidrsubnet(local.vpc_cidr, 8, k)]
  private_subnets = [for k, v in data.aws_availability_zones.available.names : 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"
  }

}
#---------------------------------------------------------------
# Example to consume aws-eks-accelerator-for-terraform module
#---------------------------------------------------------------
module "aws-eks-accelerator-for-terraform" {
  source = "github.com/aws-samples/aws-eks-accelerator-for-terraform"

  tenant            = local.tenant
  environment       = local.environment
  zone              = local.zone
  terraform_version = local.terraform_version

  # EKS Cluster VPC and Subnet mandatory config
  vpc_id             = module.aws_vpc.vpc_id
  private_subnet_ids = module.aws_vpc.private_subnets

  # EKS CONTROL PLANE VARIABLES
  create_eks         = true
  kubernetes_version = local.kubernetes_version


  # EKS MANAGED NODE GROUPS
  managed_node_groups = {
    mg_4 = {
      node_group_name = "managed-ondemand"
      instance_types  = ["m4.large"]
      subnet_ids      = module.aws_vpc.private_subnets
    }
  }

  # FARGATE
  fargate_profiles = {
    default = {
      fargate_profile_name = "default"
      fargate_profile_namespaces = [
        {
          namespace = "default"
          k8s_labels = {
            Environment = "preprod"
            Zone        = "dev"
            env         = "fargate"
          }
      }]
      subnet_ids = module.aws_vpc.private_subnets
      additional_tags = {
        ExtraTag = "Fargate"
      }
    },
  }

}

module "kubernetes-addons" {
  source = "github.com/aws-samples/aws-eks-accelerator-for-terraform//modules/kubernetes-addons"

  eks_cluster_id               = module.aws-eks-accelerator-for-terraform.eks_cluster_id
  eks_oidc_issuer_url          = module.aws-eks-accelerator-for-terraform.eks_oidc_issuer_url
  eks_oidc_provider_arn        = module.aws-eks-accelerator-for-terraform.eks_oidc_provider_arn
  eks_worker_security_group_id = module.aws-eks-accelerator-for-terraform.worker_security_group_id
  auto_scaling_group_names     = module.aws-eks-accelerator-for-terraform.self_managed_node_group_autoscaling_groups

  # EKS Managed Add-ons
  enable_amazon_eks_vpc_cni    = true
  enable_amazon_eks_coredns    = true
  enable_amazon_eks_kube_proxy = true

  #K8s Add-ons
  enable_aws_load_balancer_controller = true
  enable_metrics_server               = true
  enable_cluster_autoscaler           = true
}