locals {
  # Concatinate list of given policies and default policy, if it is enabled
  policies_list = var.enable_default_policy ? concat(["arn:aws:iam::aws:policy/service-role/AmazonEC2ContainerServiceforEC2Role"], var.policies_list) : var.policies_list
}

resource "aws_iam_role" "ecs_instance_role" {
  name = "${var.name_prefix}-${var.name}"

  assume_role_policy = <<POLICY
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "Service": "ec2.amazonaws.com"
      },
      "Effect": "Allow",
      "Sid": ""
    }
  ]
}
POLICY
  tags               = var.common_tags
}

resource "aws_iam_role_policy_attachment" "attachments" {
  count      = length(local.policies_list)
  role       = aws_iam_role.ecs_instance_role.id
  policy_arn = local.policies_list[count.index]
}

resource "aws_iam_instance_profile" "ecs_instance_profile" {
  name = "${var.name_prefix}-${var.name}"
  role = aws_iam_role.ecs_instance_role.name
}