AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::LanguageExtensions

Parameters:

  InstancesToManage:
    Type: CommaDelimitedList
    Description: Instances to be managed
    Default: FirstInstance,SecondInstance,ThirdInstance

  Environment:
    Description: Lifecycle environment.
    Type: String
    AllowedValues:
      - sandbox
      - dev
      - qa
      - prod
    Default: dev

  LatestAmiId:
    Description: Region-specific image to use.
    Type: AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>
    Default: /aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2

Mappings:
  dev:
    FirstInstance:
      InstanceType: t2.micro
    SecondInstance:
      InstanceType: t2.micro
    ThirdInstance:
      InstanceType: t2.micro
  qa:
    FirstInstance:
      InstanceType: t2.medium
    SecondInstance:
      InstanceType: t2.medium
    ThirdInstance:
      InstanceType: t2.large
  prod:
    FirstInstance:
      InstanceType: t2.large
    SecondInstance:
      InstanceType: t2.xlarge
    ThirdInstance:
      InstanceType: t2.2xlarge

Resources:

  Fn::ForEach::Instances:
    - InstanceLogicalId
    - [FirstInstance, SecondInstance, ThirdInstance]
    - ${InstanceLogicalId}:
        Type: AWS::EC2::Instance
        Properties:
          ImageId: !Ref LatestAmiId
          InstanceType: !FindInMap
            - !Ref Environment
            - !Ref InstanceLogicalId
            - InstanceType
            - DefaultValue: t2.micro


Outputs:
  Fn::ForEach::InstanceOutputs:
    - InstanceLogicalId
    - !Ref InstancesToManage
    - "${InstanceLogicalId}Id":
        Export:
          Name: !Sub ${AWS::AccountId}-${InstanceLogicalId}Id
        Value: !Ref
          Ref: InstanceLogicalId

      "${InstanceLogicalId}AvailabilityZone":
        Value:
          Fn::GetAtt:
            - !Ref InstanceLogicalId
            - AvailabilityZone