provider "aws" {
  region = local.region
}

data "aws_availability_zones" "available" {}

locals {
  name   = basename(path.cwd)
  region = "us-west-2"

  vpc_cidr = "10.0.0.0/16"
  azs      = slice(data.aws_availability_zones.available.names, 0, 3)

  tags = {
    Blueprint  = local.name
    GithubRepo = "github.com/aws-ia/terraform-aws-eks-blueprints"
  }
}

################################################################################
# Cluster
################################################################################

#tfsec:ignore:aws-eks-enable-control-plane-logging
module "eks" {
  source  = "terraform-aws-modules/eks/aws"
  version = "~> 19.13"

  cluster_name    = local.name
  cluster_version = "1.27"

  # EKS Addons
  cluster_addons = {
    coredns    = {}
    kube-proxy = {}
    vpc-cni    = {}
  }

  vpc_id     = module.vpc.vpc_id
  subnet_ids = module.vpc.private_subnets

  eks_managed_node_groups = {
    initial = {
      instance_types = ["m5.large"]

      min_size     = 1
      max_size     = 5
      desired_size = 3
    }
  }

  tags = local.tags
}

################################################################################
# Supporting Resources
################################################################################

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

  manage_default_vpc = true

  name = local.name
  cidr = local.vpc_cidr

  azs             = local.azs
  private_subnets = [for k, v in local.azs : cidrsubnet(local.vpc_cidr, 4, k)]

  enable_nat_gateway = false

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

  tags = local.tags
}

module "vpc_endpoints" {
  source  = "terraform-aws-modules/vpc/aws//modules/vpc-endpoints"
  version = "~> 5.1"

  vpc_id = module.vpc.vpc_id

  # Security group
  create_security_group      = true
  security_group_name_prefix = "${local.name}-vpc-endpoints-"
  security_group_description = "VPC endpoint security group"
  security_group_rules = {
    ingress_https = {
      description = "HTTPS from VPC"
      cidr_blocks = [module.vpc.vpc_cidr_block]
    }
  }

  endpoints = merge({
    s3 = {
      service         = "s3"
      service_type    = "Gateway"
      route_table_ids = module.vpc.private_route_table_ids
      tags = {
        Name = "${local.name}-s3"
      }
    }
    },
    { for service in toset(["autoscaling", "ecr.api", "ecr.dkr", "ec2", "ec2messages", "elasticloadbalancing", "sts", "kms", "logs", "ssm", "ssmmessages"]) :
      replace(service, ".", "_") =>
      {
        service             = service
        subnet_ids          = module.vpc.private_subnets
        private_dns_enabled = true
        tags                = { Name = "${local.name}-${service}" }
      }
  })

  tags = local.tags
}