terraform {
  required_providers {
    coder = {
      source  = "coder/coder"
      version = "0.6.10"
    }
  }
}

# Last updated 2022-05-31
# aws ec2 describe-regions | jq -r '[.Regions[].RegionName] | sort'
variable "region" {
  description = "What region should your workspace live in?"
  default     = "us-east-1"
  validation {
    condition = contains([
      "ap-northeast-1",
      "ap-northeast-2",
      "ap-northeast-3",
      "ap-south-1",
      "ap-southeast-1",
      "ap-southeast-2",
      "ca-central-1",
      "eu-central-1",
      "eu-north-1",
      "eu-west-1",
      "eu-west-2",
      "eu-west-3",
      "sa-east-1",
      "us-east-1",
      "us-east-2",
      "us-west-1",
      "us-west-2"
    ], var.region)
    error_message = "Invalid region!"
  }
}

variable "instance_type" {
  description = "What instance type should your workspace use?"
  default     = "t3.micro"
  validation {
    condition = contains([
      "t3.micro",
      "t3.small",
      "t3.medium",
      "t3.large",
      "t3.xlarge",
      "t3.2xlarge",
    ], var.instance_type)
    error_message = "Invalid instance type!"
  }
}

provider "aws" {
  region = var.region
}

data "coder_workspace" "me" {
}

data "aws_ami" "windows" {
  most_recent = true
  owners      = ["amazon"]

  filter {
    name   = "name"
    values = ["Windows_Server-2019-English-Full-Base-*"]
  }
}

resource "coder_agent" "main" {
  arch = "amd64"
  auth = "aws-instance-identity"
  os   = "windows"

  login_before_ready = false
}

locals {

  # User data is used to stop/start AWS instances. See:
  # https://github.com/hashicorp/terraform-provider-aws/issues/22

  user_data_start = <<EOT
<powershell>
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
${coder_agent.main.init_script}
</powershell>
<persist>true</persist>
EOT

  user_data_end = <<EOT
<powershell>
shutdown /s
</powershell>
<persist>true</persist>
EOT
}

resource "aws_instance" "dev" {
  ami               = data.aws_ami.windows.id
  availability_zone = "${var.region}a"
  instance_type     = var.instance_type
  count             = 1

  user_data = data.coder_workspace.me.transition == "start" ? local.user_data_start : local.user_data_end
  tags = {
    Name = "coder-${data.coder_workspace.me.owner}-${data.coder_workspace.me.name}"
    # Required if you are using our example policy, see template README
    Coder_Provisioned = "true"
  }

}

resource "coder_metadata" "workspace_info" {
  resource_id = aws_instance.dev.id
  item {
    key   = "region"
    value = var.region
  }
  item {
    key   = "instance type"
    value = aws_instance.dev.instance_type
  }
  item {
    key   = "disk"
    value = "${aws_instance.dev.root_block_device[0].volume_size} GiB"
  }
}