---
constants:
  __name: "{{ name }}_{{ __guid }}"
variables:
  name:
    desc: "Name of the Auto Scaling Group."
    required: true
    group: Auto Scaling Group Details
  launch_configuration:
    desc: "Name of the launch configuration to use."
    required: true
    group: Launch Configuration
    links_to: resource.aws_launch_configuration.name
  min_size:
    desc: "Minimum number of instances in the Auto Scaling Group."
    required: true
    group: Auto Scaling Group Details
    default: 1
  max_size:
    desc: "Maximum number of instances in the Auto Scaling Group."
    required: true
    group: Auto Scaling Group Details
    default: 3
  desired_capacity:
    desc: "Desired number of instances."
    required: false
    group: Auto Scaling Group Details
    default: 1
  vpc_zone_identifier:
    desc: "List of subnet IDs."
    required: true
    group: Network
    links_to: resource.aws_subnet.id
  health_check_type:
    desc: "Type of health check to use. Valid values are 'EC2' or 'ELB'."
    required: false
    group: Health Checks
    default: "EC2"
  health_check_grace_period:
    desc: "Time (in seconds) after instance comes into service before checking health."
    required: false
    group: Health Checks
    default: 300
  termination_policies:
    desc: "List of termination policies."
    required: false
    group: Advanced
    default: ["Default"]
  tags:
    group: Tags
    required: false
groups:
  Auto Scaling Group Details:
    order: 1
    desc: "Basic settings for the Auto Scaling Group."
  Launch Configuration:
    order: 2
    desc: "Launch configuration settings."
  Network:
    order: 3
    desc: "Network settings for the Auto Scaling Group."
  Health Checks:
    order: 4
    desc: "Health check settings."
  Advanced:
    order: 5
    desc: "Advanced settings for the Auto Scaling Group."
  Tags:
    order: 6
    desc: "Tags to assign to the Auto Scaling Group."
---

resource "aws_autoscaling_group" "__name" {
  name                      = {{ name }}
  launch_configuration      = {{ launch_configuration }}
  min_size                  = {{ min_size }}
  max_size                  = {{ max_size }}
  desired_capacity          = {{ desired_capacity }}
  vpc_zone_identifier       = [
    {{# vpc_zone_identifier }}
      {{ vpc_zone_identifier }},
    {{/ vpc_zone_identifier }}
  ]
  health_check_type         = {{ health_check_type }}
  health_check_grace_period = {{ health_check_grace_period }}
  termination_policies      = [
    {{# termination_policies }}
      {{ termination_policies }},
    {{/ termination_policies }}
  ]

  tags = [
    {
      Key                 = "Name"
      Value               = {{ name }}
      PropagateAtLaunch   = true
    },
    {{# tags }}
    {
      Key               = {{ tags.key | required: false }}
      Value             = {{ tags.value | required: false }}
      PropagateAtLaunch = true
    },
    {{/ tags }}
  ]
}

// Configures the Auto Scaling Group with minimum and maximum instance counts for efficient scaling.
// Uses private subnets for enhanced security.
// Sets health checks and termination policies with sensible defaults.
// Encourages tagging for resource identification and management.
//