{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Parameters": {
    "VpcCidr": {
      "Description": "The VPC Network Range",
      "Type": "String",
      "MinLength": "9",
      "MaxLength": "18",
      "Default": "10.0.0.0/16",
      "AllowedPattern": "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{1,2})",
      "ConstraintDescription": "must be a valid IP CIDR range of the form x.x.x.x/x."
    },
    "SubnetCidr": {
      "Description": "The Subnet Network Range",
      "Type": "String",
      "MinLength": "9",
      "MaxLength": "18",
      "Default": "10.0.0.0/24",
      "AllowedPattern": "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{1,2})",
      "ConstraintDescription": "must be a valid IP CIDR range of the form x.x.x.x/x."
    },
    "SubnetAvailabilityZone": {
      "Description": "Availability Zone",
      "Type": "String",
      "Default": "auto",
      "ConstraintDescription": "Must be a valid AZ for the region or 'auto'."
    },
    "NameTag": {
      "Description": "Will set the name tag on all resources created",
      "Type": "String"
    }
  },
  "Conditions": {
    "SubnetAutoSelection": {
      "Fn::Equals": [
        {
          "Ref": "SubnetAvailabilityZone"
        },
        "auto"
      ]
    }
  },
  "Resources": {
    "Vpc": {
      "Type": "AWS::CloudFormation::Stack",
      "Properties": {
        "Parameters": {
          "VpcCidr": {
            "Ref": "VpcCidr"
          },
          "CreateVpcSecurityGroup": "true",
          "CreateInternetGateway": "true",
          "OpenVpcCommunication": "true",
          "NameTag": {
            "Ref": "NameTag"
          }
        },
        "TemplateURL": "https://s3.amazonaws.com/./particles/cftemplates/vpc.template.json"
      }
    },
    "Subnet": {
      "Type": "AWS::CloudFormation::Stack",
      "Properties": {
        "Parameters": {
          "SubnetCidr": {
            "Ref": "SubnetCidr"
          },
          "AvailabilityZone": {
            "Fn::If": [
              "SubnetAutoSelection",
              {
                "Fn::Select": [
                  "0",
                  {
                    "Fn::GetAZs": ""
                  }
                ]
              },
              {
                "Ref": "SubnetAvailabilityZone"
              }
            ]
          },
          "VpcId": {
            "Fn::GetAtt": [
              "Vpc",
              "Outputs.VpcId"
            ]
          },
          "RouteTableId": {
            "Fn::GetAtt": [
              "Vpc",
              "Outputs.RouteTableId"
            ]
          },
          "NameTag": {
            "Ref": "NameTag"
          }
        },
        "TemplateURL": "https://s3.amazonaws.com/./particles/cftemplates/subnet.template.json"
      },
      "DependsOn": "Vpc"
    }
  },
  "Outputs": {
    "SubnetId": {
      "Value": {
        "Fn::GetAtt": [
          "Subnet",
          "Outputs.SubnetId"
        ]
      },
      "Description": "Subnet"
    },
    "VpcId": {
      "Value": {
        "Fn::GetAtt": [
          "Vpc",
          "Outputs.VpcId"
        ]
      },
      "Description": "VPC ID"
    },
    "SubnetAZ": {
      "Value": {
        "Fn::If": [
          "SubnetAutoSelection",
          {
            "Fn::Select": [
              "0",
              {
                "Fn::GetAZs": ""
              }
            ]
          },
          {
            "Ref": "SubnetAvailabilityZone"
          }
        ]
      }
    }
  }
}