resource "aws_launch_configuration" "fundapp_demo" {
  name_prefix          = "${var.vpc_name}_app"
  image_id             = "${var.image_id}"
  instance_type        = "t2.nano"
  iam_instance_profile = "${aws_iam_instance_profile.app_profile.id}"
  key_name             = "${aws_key_pair.server_keypair.key_name}"

  security_groups = [
    "${aws_security_group.app_sg.id}",
    "${aws_security_group.external_ssh_accept_sg.id}",
  ]

  user_date = "${data.template_file.app_user_data.rendered}"

  root_block_device {
    volume_type = "gp2"
    volume_size = "30"
  }

  lifecycle {
    create_before_destroy = true
  }
}

resource "aws_autoscaling_group" "app_asg" {
  name                 = "${var.vpc_name}_app_asg"
  launch_configuration = "${aws_launch_configuration.fundapp_demo.name}"

  availability_zones = [
    "${var.aws_az_1}",
    "${var.aws_az_2}",
    "${var.aws_az_3}",
  ]

  vpc_zone_identifier = [
    "${aws_subnet.public_1.id}",
    "${aws_subnet.public_2.id}",
    "${aws_subnet.public_3.id}",
  ]

  min_size                  = 1
  max_size                  = 3
  desired_capacity          = 2
  health_check_grace_period = 300

  enabled_metrics = [
    "GroupMinSize",
    "GroupMazSize",
    "GroupDesiredCapacity",
    "GroupInServiceInstances",
    "GroupPendingInstances",
    "GroupStandbyInstances",
    "GroupTerminatingInstances",
    "GroupTotalInstances",
  ]

  load_balancers    = ["${aws_elb.app_elb.name}"]
  health_check_type = "EC2"

  lifecycle {
    create_before_destroy = true
  }
}

data "template_file" "app_user_data" {
  template = "${file("${path.module}/files/app_data.tpl")}"
}