/*
 * 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"
}

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"])
  cluster_name = 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

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

  enable_dns_hostnames = true

  public_subnet_tags = {
    "kubernetes.io/cluster/${local.cluster_name}" = "shared"
    "kubernetes.io/role/elb"                      = "1"
  }
  private_subnet_tags = {
    "kubernetes.io/cluster/${local.cluster_name}" = "shared"
    "kubernetes.io/role/internal-elb"             = "1"
  }
  manage_default_security_group = true

  default_security_group_name = "${local.vpc_name}-endpoint-secgrp"
  default_security_group_ingress = [
    {
      protocol    = -1
      from_port   = 0
      to_port     = 0
      cidr_blocks = local.vpc_cidr
  }]
  default_security_group_egress = [
    {
      from_port   = 0
      to_port     = 0
      protocol    = -1
      cidr_blocks = "0.0.0.0/0"
  }]
}

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

  create = true
  vpc_id = module.aws_vpc.vpc_id

  endpoints = {
    s3 = {
      service      = "s3"
      service_type = "Gateway"
      route_table_ids = flatten([
        module.aws_vpc.intra_route_table_ids,
      module.aws_vpc.private_route_table_ids])
      tags = { Name = "s3-vpc-Gateway" }
    },
  }
}

data "aws_security_group" "default" {
  name   = "default"
  vpc_id = module.aws_vpc.vpc_id
}

module "vpc_endpoints" {
  source  = "terraform-aws-modules/vpc/aws//modules/vpc-endpoints"
  version = "v3.2.0"
  create  = true
  vpc_id  = module.aws_vpc.vpc_id
  security_group_ids = [
  data.aws_security_group.default.id]
  subnet_ids = module.aws_vpc.private_subnets

  endpoints = {
    ssm = {
      service             = "ssm"
      private_dns_enabled = true
    },
    logs = {
      service             = "logs"
      private_dns_enabled = true
    },
    autoscaling = {
      service             = "autoscaling"
      private_dns_enabled = true
    },
    sts = {
      service             = "sts"
      private_dns_enabled = true
    },
    elasticloadbalancing = {
      service             = "elasticloadbalancing"
      private_dns_enabled = true
    },
    ec2 = {
      service             = "ec2"
      private_dns_enabled = true
    },
    ec2messages = {
      service             = "ec2messages"
      private_dns_enabled = true
    },
    ecr_api = {
      service             = "ecr.api"
      private_dns_enabled = true
    },
    ecr_dkr = {
      service             = "ecr.dkr"
      private_dns_enabled = true
    },
    kms = {
      service             = "kms"
      private_dns_enabled = true
    }


  }
  tags = {
    Project  = "EKS"
    Endpoint = "true"
  }
}

#---------------------------------------------------------------
# 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
    }
  }

}