AWSTemplateFormatVersion: "2010-09-09"

Description: Sample template describing an AWS::EC2::VPC resource, with two public subnets and 2 private subnets, route tables, and routes to the Internet. (uksb-1q9p31idr)

Parameters:
  AppNameTagValue:
    Description: 'Specify a value for the AppName tag, that will be applied to your infrastructure resources that support tags; minimum length: 3, maximum: 50.'
    Type: String
    Default: AWS CloudFormation Workshop - example app
    MaxLength: 50
    MinLength: 3

  Env:
    Description: The type of environment with which to tag your infrastructure resources that support tags.
    Type: String
    AllowedValues:
      - dev
      - qa
      - prod
    Default: dev

  NameTagValue:
    Description: 'Specify a value for the Name tag, that will be applied to your infrastructure resources that support tags; minimum length: 3, maximum: 50.'
    Type: String
    Default: AWS CloudFormation Workshop
    MaxLength: 50
    MinLength: 3

  PrivateSubnet1Ipv4Cidr:
    Description: IPv4 CIDR block to assign to PrivateSubnet1.
    Type: String
    Default: 10.0.10.0/24
    AllowedPattern: ^([0-9]+\.){3}[0-9]+\/[0-9]+$
    MaxLength: 18
    MinLength: 9

  PrivateSubnet2Ipv4Cidr:
    Description: IPv4 CIDR block to assign to PrivateSubnet2.
    Type: String
    Default: 10.0.20.0/24
    AllowedPattern: ^([0-9]+\.){3}[0-9]+\/[0-9]+$
    MaxLength: 18
    MinLength: 9

  PublicSubnet1Ipv4Cidr:
    Description: IPv4 CIDR block to assign to PublicSubnet1.
    Type: String
    Default: 10.0.1.0/24
    AllowedPattern: ^([0-9]+\.){3}[0-9]+\/[0-9]+$
    MaxLength: 18
    MinLength: 9

  PublicSubnet2Ipv4Cidr:
    Description: IPv4 CIDR block to assign to PublicSubnet2.
    Type: String
    Default: 10.0.2.0/24
    AllowedPattern: ^([0-9]+\.){3}[0-9]+\/[0-9]+$
    MaxLength: 18
    MinLength: 9

  VpcIpv4Cidr:
    Description: IPv4 CIDR block to assign to your VPC.
    Type: String
    Default: 10.0.0.0/16
    AllowedPattern: ^([0-9]+\.){3}[0-9]+\/[0-9]+$
    MaxLength: 18
    MinLength: 9

Resources:
  InternetGateway:
    Type: AWS::EC2::InternetGateway
    Properties:
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'

  NatGateway1:
    Type: AWS::EC2::NatGateway
    Properties:
      AllocationId: !GetAtt NatGatewayEip1.AllocationId
      SubnetId: !Ref 'PublicSubnet1'
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'

  NatGateway2:
    Type: AWS::EC2::NatGateway
    Properties:
      AllocationId: !GetAtt NatGatewayEip2.AllocationId
      SubnetId: !Ref 'PublicSubnet2'
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'

  NatGatewayEip1:
    Type: AWS::EC2::EIP
    DependsOn: VpcGatewayAttachment
    Properties:
      Domain: vpc
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'

  NatGatewayEip2:
    Type: AWS::EC2::EIP
    DependsOn: VpcGatewayAttachment
    Properties:
      Domain: vpc
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'

  PrivateSubnet1:
    Type: AWS::EC2::Subnet
    Properties:
      AvailabilityZone: !Sub '${AWS::Region}a'
      CidrBlock: !Ref 'PrivateSubnet1Ipv4Cidr'
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'
      VpcId: !Ref 'Vpc'

  PrivateSubnet1Ipv4RouteToTheInternet:
    Type: AWS::EC2::Route
    Properties:
      DestinationCidrBlock: 0.0.0.0/0
      NatGatewayId: !Ref 'NatGateway1'
      RouteTableId: !Ref 'PrivateSubnet1RouteTable'

  PrivateSubnet1RouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'
      VpcId: !Ref 'Vpc'

  PrivateSubnet1RouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      RouteTableId: !Ref 'PrivateSubnet1RouteTable'
      SubnetId: !Ref 'PrivateSubnet1'

  PrivateSubnet2:
    Type: AWS::EC2::Subnet
    Properties:
      AvailabilityZone: !Sub '${AWS::Region}a'
      CidrBlock: !Ref 'PrivateSubnet2Ipv4Cidr'
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'
      VpcId: !Ref 'Vpc'

  PrivateSubnet2Ipv4RouteToTheInternet:
    Type: AWS::EC2::Route
    Properties:
      DestinationCidrBlock: 0.0.0.0/0
      NatGatewayId: !Ref 'NatGateway2'
      RouteTableId: !Ref 'PrivateSubnet2RouteTable'

  PrivateSubnet2RouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'
      VpcId: !Ref 'Vpc'

  PrivateSubnet2RouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      RouteTableId: !Ref 'PrivateSubnet2RouteTable'
      SubnetId: !Ref 'PrivateSubnet2'

  PublicSubnet1:
    Type: AWS::EC2::Subnet
    Properties:
      AvailabilityZone: !Sub '${AWS::Region}a'
      CidrBlock: !Ref 'PublicSubnet1Ipv4Cidr'
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'
      VpcId: !Ref 'Vpc'

  PublicSubnet1Ipv4RouteToTheInternet:
    Type: AWS::EC2::Route
    DependsOn: VpcGatewayAttachment
    Properties:
      DestinationCidrBlock: 0.0.0.0/0
      GatewayId: !Ref 'InternetGateway'
      RouteTableId: !Ref 'PublicSubnet1RouteTable'

  PublicSubnet1RouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'
      VpcId: !Ref 'Vpc'

  PublicSubnet1RouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      RouteTableId: !Ref 'PublicSubnet1RouteTable'
      SubnetId: !Ref 'PublicSubnet1'

  PublicSubnet2:
    Type: AWS::EC2::Subnet
    Properties:
      AvailabilityZone: !Sub '${AWS::Region}b'
      CidrBlock: !Ref 'PublicSubnet2Ipv4Cidr'
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'
      VpcId: !Ref 'Vpc'

  PublicSubnet2Ipv4RouteToTheInternet:
    Type: AWS::EC2::Route
    DependsOn: VpcGatewayAttachment
    Properties:
      DestinationCidrBlock: 0.0.0.0/0
      GatewayId: !Ref 'InternetGateway'
      RouteTableId: !Ref 'PublicSubnet2RouteTable'

  PublicSubnet2RouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'
      VpcId: !Ref 'Vpc'

  PublicSubnet2RouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      RouteTableId: !Ref 'PublicSubnet2RouteTable'
      SubnetId: !Ref 'PublicSubnet2'

  Vpc:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: !Ref 'VpcIpv4Cidr'
      EnableDnsHostnames: true
      EnableDnsSupport: true
      Tags:
        - Key: Name
          Value: !Ref 'NameTagValue'
        - Key: AppName
          Value: !Ref 'AppNameTagValue'
        - Key: Env
          Value: !Ref 'Env'

  VpcGatewayAttachment:
    Type: AWS::EC2::VPCGatewayAttachment
    Properties:
      InternetGatewayId: !Ref 'InternetGateway'
      VpcId: !Ref 'Vpc'

Outputs:
  PrivateSubnet1Id:
    Value: !Ref 'PrivateSubnet1'
    Export:
      Name: !Sub '${AWS::StackName}-PrivateSubnet1Id'

  PrivateSubnet2Id:
    Value: !Ref 'PrivateSubnet2'
    Export:
      Name: !Sub '${AWS::StackName}-PrivateSubnet2Id'

  PublicSubnet1Id:
    Value: !Ref 'PublicSubnet1'
    Export:
      Name: !Sub '${AWS::StackName}-PublicSubnet1Id'

  PublicSubnet2Id:
    Value: !Ref 'PublicSubnet2'
    Export:
      Name: !Sub '${AWS::StackName}-PublicSubnet2Id'

  VpcId:
    Value: !Ref 'Vpc'
    Export:
      Name: !Sub '${AWS::StackName}-VpcId'