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

Parameters:
  AvailabilityTypes:
    Type: CommaDelimitedList
    Description: Types of subnets availability - public, private, or both
    AllowedValues:
      - Public
      - Private
    Default: Public,Private

Mappings:
  SubnetOne:
    Public: 
      Cidr:  10.215.0.0/24 
    Private: 
      Cidr:  10.215.1.0/24 
  SubnetTwo:
    Public: 
      Cidr:  10.215.2.0/24
    Private: 
      Cidr:  10.215.3.0/24
  SubnetThree:
    Public: 
      Cidr:  10.215.4.0/24
    Private: 
      Cidr:  10.215.5.0/24

Resources:
  VPC:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: 10.215.0.0/16
      EnableDnsSupport: true
      EnableDnsHostnames: true

  Fn::ForEach::Subnets:
    - SubnetIdentifier
    - - SubnetOne
      - SubnetTwo
      - SubnetThree
    - Fn::ForEach::SubnetAvailabilityType:
      - AvailabilityType
      - !Ref AvailabilityTypes
      - "${SubnetIdentifier}${AvailabilityType}":
          Type: AWS::EC2::Subnet
          Properties:
            VpcId: !Ref VPC
            CidrBlock: !FindInMap
              - !Ref SubnetIdentifier
              - !Ref AvailabilityType
              - Cidr