AWSTemplateFormatVersion: "2010-09-09"

Description: AWS CloudFormation workshop - Multi region latest AMI (uksb-1q9p31idr) (tag:multi-region-latest-ami).

Metadata:
  AWS::CloudFormation::Interface:
    ParameterGroups:
      - Label:
          default: 'Amazon EC2 Configuration'
        Parameters:
          - AmiID
    ParameterLabels:
      AmiID:
        default: 'Amazon Machine Image ID'

Parameters:
  EnvironmentType:
    Description: 'Specify the Environment type of the stack.'
    Type: String
    Default: Test
    AllowedValues:
      - Dev
      - Test
      - Prod
    ConstraintDescription: 'Specify either Dev, Test or Prod.'

  AmiID:
    Type: AWS::EC2::Image::Id # Replace this with SSM parameter type
    Description: 'The ID of the AMI.'
    Default: '' # Provide an Amazon Linux AMI alias

Mappings:
  EnvironmentToInstanceType:
    Dev:
      InstanceType: t2.nano
    Test:
      InstanceType: t2.micro
    Prod:
      InstanceType: t2.small

Resources:
  WebServerInstance:
    Type: AWS::EC2::Instance
    Properties:
      ImageId: !Ref AmiID
      InstanceType: !FindInMap [EnvironmentToInstanceType, !Ref EnvironmentType, InstanceType]
      Tags:
        - Key: Name
          Value: !Join [ '-', [ !Ref EnvironmentType, webserver ] ]

  WebServerEIP:
    Type: AWS::EC2::EIP
    Properties:
      Domain: vpc
      InstanceId: !Ref WebServerInstance

Outputs:
  WebServerPublicDNS:
    Description: 'Public DNS of EC2 instance'
    Value: !GetAtt WebServerInstance.PublicDnsName

  WebServerElasticIP:
    Description: 'Elastic IP assigned to EC2'
    Value: !Ref WebServerEIP