Description: Creates VPC and required components of VPC

Parameters:
  VPCCIDR:
    Type: String
    Description: CIDR block should be used to create the VPC (e.g. 172.21.1.0/24)
    AllowedPattern: "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{2})"
    ConstraintDescription: Must be a valid IP CIDR range of the form x.x.x.x/x. (e.g. 172.21.1.0/24)
  PublicSubnet1:
    Type: String
    Description: CIDR block should be used to create the public subnet in AZ1 (e.g. 172.21.1.0/26)
    AllowedPattern: "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{2})"
    ConstraintDescription: Must be a valid IP CIDR range of the form x.x.x.x/x. (e.g. 172.21.1.0/26)
  PublicSubnet2:
    Type: String
    Description: CIDR block should be used to create the public subnet in AZ1 (e.g. 172.21.1.64/26)
    AllowedPattern: "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{2})"
    ConstraintDescription: Must be a valid IP CIDR range of the form x.x.x.x/x. (e.g. 172.21.1.64/26)
  PrivateSubnet1:
    Type: String
    Description: CIDR block should be used to create the public subnet in AZ1 (e.g. 172.21.1.128/26)
    AllowedPattern: "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{2})"
    ConstraintDescription: Must be a valid IP CIDR range of the form x.x.x.x/x. (e.g. 172.21.1.128/26)
  PrivateSubnet2:
    Type: String
    Description: CIDR block should be used to create the public subnet in AZ1 (e.g. 172.21.1.192/26)
    AllowedPattern: "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{2})"
    ConstraintDescription: Must be a valid IP CIDR range of the form x.x.x.x/x. (e.g. 172.21.1.192/26)
  UATApprovalEmail:
    Type: String
    Description: Email address to which UAT approval should be sent
    AllowedPattern: "([a-zA-Z0-9_\\-\\.]+)@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.)|(([a-zA-Z0-9\\-]+\\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)"
    ConstraintDescription: Must be a valid email address. (e.g. name@example.com)
  ProdApprovalEmail:
    Type: String
    Description: Email address to which Prod approval should be sent
    AllowedPattern: "([a-zA-Z0-9_\\-\\.]+)@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.)|(([a-zA-Z0-9\\-]+\\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)"
    ConstraintDescription: Must be a valid email address. (e.g. name@example.com)
  TagPrefix:
    Type: String
    Description: Enter Prefix that should be used for Tags.

Resources:
  S3Bucket:
    Type: AWS::S3::Bucket
    DeletionPolicy: Retain
  UATTopic:
    Type: "AWS::SNS::Topic"
    Properties:
      Subscription:
        -
          Endpoint:
            Ref: UATApprovalEmail
          Protocol: "email"
  ProdTopic:
    Type: "AWS::SNS::Topic"
    Properties:
      Subscription:
        -
          Endpoint:
            Ref: UATApprovalEmail
          Protocol: "email"
  VPC:
    Type: "AWS::EC2::VPC"
    Properties:
      CidrBlock:
        Ref: VPCCIDR
      EnableDnsSupport: true
      EnableDnsHostnames: true
      Tags:
        - Key: Name
          Value:
            Ref: TagPrefix

  PubSubnet1:
    Type: "AWS::EC2::Subnet"
    Properties:
      VpcId:
        Ref: VPC
      CidrBlock:
        Ref: PublicSubnet1
      AvailabilityZone:
        Fn::Sub: ${AWS::Region}a
      MapPublicIpOnLaunch: true
      Tags:
        - Key: Name
          Value:
            Fn::Sub: ${TagPrefix}-PublicSubnet1

  PubSubnet2:
    Type: "AWS::EC2::Subnet"
    Properties:
      VpcId:
        Ref: VPC
      CidrBlock:
        Ref: PublicSubnet2
      AvailabilityZone:
        Fn::Sub: ${AWS::Region}b
      MapPublicIpOnLaunch: true
      Tags:
        - Key: Name
          Value:
            Fn::Sub: ${TagPrefix}-PublicSubnet2

  PriSubnet1:
    Type: "AWS::EC2::Subnet"
    Properties:
      VpcId:
        Ref: VPC
      CidrBlock:
        Ref: PrivateSubnet1
      AvailabilityZone:
        Fn::Sub: ${AWS::Region}a
      Tags:
        - Key: Name
          Value:
            Fn::Sub: ${TagPrefix}-PrivateSubnet1

  PriSubnet2:
    Type: "AWS::EC2::Subnet"
    Properties:
      VpcId:
        Ref: VPC
      CidrBlock:
        Ref: PrivateSubnet2
      AvailabilityZone:
        Fn::Sub: ${AWS::Region}b
      Tags:
        - Key: Name
          Value:
            Fn::Sub: ${TagPrefix}-PrivateSubnet2

  InternetGateway:
    Type: "AWS::EC2::InternetGateway"
    Properties:
      Tags:
        - Key: Name
          Value:
            Fn::Sub: ${TagPrefix}-IGW

  GatewayToInternet:
    Type: "AWS::EC2::VPCGatewayAttachment"
    Properties:
      VpcId:
        Ref: VPC
      InternetGatewayId:
        Ref: InternetGateway

  NATEIP1:
    Type: "AWS::EC2::EIP"
    Properties:
      Domain: vpc
    DependsOn: GatewayToInternet

  NATEIP2:
    Type: "AWS::EC2::EIP"
    Properties:
      Domain: vpc
    DependsOn: GatewayToInternet

  NAT1:
    Type: "AWS::EC2::NatGateway"
    Properties:
      AllocationId:
        Fn::GetAtt: [ NATEIP1, AllocationId ]
      SubnetId:
        Ref: PubSubnet1

  NAT2:
    Type: "AWS::EC2::NatGateway"
    Properties:
      AllocationId:
        Fn::GetAtt: [ NATEIP2, AllocationId ]
      SubnetId:
        Ref: PubSubnet2

  PublicRouteTable:
    Type: "AWS::EC2::RouteTable"
    Properties:
      VpcId:
        Ref: VPC
      Tags:
        - Key: Name
          Value:
            Fn::Sub: ${TagPrefix}-PublicRouteTable

  PrivateRouteTable1:
    Type: "AWS::EC2::RouteTable"
    Properties:
      VpcId:
        Ref: VPC
      Tags:
        - Key: Name
          Value:
            Fn::Sub: ${TagPrefix}-PrivateRouteTable1

  PrivateRouteTable2:
    Type: "AWS::EC2::RouteTable"
    Properties:
      VpcId:
        Ref: VPC
      Tags:
        - Key: Name
          Value:
            Fn::Sub: ${TagPrefix}-PrivateRouteTable2

  PublicRoute:
    Type: "AWS::EC2::Route"
    DependsOn: GatewayToInternet
    Properties:
      DestinationCidrBlock: 0.0.0.0/0
      GatewayId:
        Ref: InternetGateway
      RouteTableId:
        Ref: PublicRouteTable

  PrivateRoute1:
    Type: "AWS::EC2::Route"
    Properties:
      DestinationCidrBlock: 0.0.0.0/0
      NatGatewayId:
        Ref: NAT1
      RouteTableId:
        Ref: PrivateRouteTable1

  PrivateRoute2:
    Type: "AWS::EC2::Route"
    Properties:
      DestinationCidrBlock: 0.0.0.0/0
      NatGatewayId:
        Ref: NAT2
      RouteTableId:
        Ref: PrivateRouteTable2

  PubSubnet1RTAssoc:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Properties:
      RouteTableId:
        Ref: PublicRouteTable
      SubnetId:
        Ref: PubSubnet1

  PubSubnet2RTAssoc:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Properties:
      RouteTableId:
        Ref: PublicRouteTable
      SubnetId:
        Ref: PubSubnet2

  PrivSubnet1RTAssoc:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Properties:
      RouteTableId:
        Ref: PrivateRouteTable1
      SubnetId:
        Ref: PriSubnet1

  PrivSubnet2RTAssoc:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Properties:
      RouteTableId:
        Ref: PrivateRouteTable2
      SubnetId:
        Ref: PriSubnet2

  RDSSubnetGroup:
    Type: "AWS::RDS::DBSubnetGroup"
    Properties:
      DBSubnetGroupDescription: "RDS DB Subnet group"
      SubnetIds:
        - Ref: PriSubnet1
        - Ref: PriSubnet2
      Tags:
        - Key: Name
          Value:
            Fn::Sub: ${TagPrefix}-DBSubnetGroup

Outputs:
  S3BucketName:
    Value:
      Ref: S3Bucket
    Description: Name of the S3 bucket
  UATTopic:
    Value:
      Fn::GetAtt: [ UATTopic, TopicName ]
    Description: Name of the SNS Topic for UAT Approval
  ProdTopic:
    Value:
      Fn::GetAtt: [ ProdTopic, TopicName ]
    Description: Name of the SNS Topic for Prod Approval
  VPCID:
    Description: "VPC ID"
    Value:
      Ref: VPC
  PrivateSubnet1:
    Description: "Subnet ID of private subnet in AZ1"
    Value:
      Ref: PriSubnet1
  PrivateSubnet2:
    Description: "Subnet ID of private subnet in AZ2"
    Value:
      Ref: PriSubnet2
  PublicSubnet1:
    Description: "Subnet ID of public subnet in AZ1"
    Value:
      Ref: PubSubnet1
  PublicSubnet2:
    Description: "Subnet ID of public subnet in AZ2"
    Value:
      Ref: PubSubnet2
  DBSubnetGroup:
    Description: "Name of the DB Subnet group"
    Value:
      Ref: RDSSubnetGroup
  NATEIP1:
    Description: "NAT Gateway ID in AZ1"
    Value:
      Ref: NAT1
  NATEIP2:
    Description: "NAT Gateway ID in AZ2"
    Value:
      Ref: NAT2