{{#layout TemplateDescription="A Subnet"}}
    {{parameter 'vpc_cidr' logicalId="SubnetCidr" description="Subnet CIDR [x.x.x.x/x]"}}
    {{#parameter logicalId="AvailabilityZone"}}
      "Default": "random",
      "Description": "Availability Zone",
      "Type": "String",
      "ConstraintDescription": "Must be a valid AZ for the region."
    {{/parameter}}
    {{#parameter logicalId="VpcId"}}
      "Description": "ID of an existing VPC to create the subnet in",
      "Type": "AWS::EC2::VPC::Id"
    {{/parameter}}
    {{#parameter logicalId="RouteTableId"}}
      "Description": "Route table that the subnet will attach to.",
      "Default": "default",
      "Type": "String",
      "MinLength": "1",
      "MaxLength": "255",
      "AllowedPattern": "[\\x20-\\x7E]*",
      "ConstraintDescription": "can contain only ASCII characters."
    {{/parameter}}
    {{#parameter logicalId="NameTag"}}
      "Description": "Set the name tag for all created resources.",
      "Default": "default",
      "Type": "String",
      "MinLength": "1",
      "MaxLength": "255",
      "AllowedPattern": "[\\x20-\\x7E]*",
      "ConstraintDescription": "can contain only ASCII characters."
    {{/parameter}}

    {{set 'true_false_set' parameterLogicalId="tf"}}

    {{#condition logicalId="condNonDefaultRouteTable"}}
      "Fn::Not": [
        {
          "Fn::Equals": [
            {
              "Ref": "RouteTableId"
            },
            "default"
          ]
        }
      ]
    {{/condition}}
    {{#condition logicalId="condNonDefaultAZ"}}
      "Fn::Not": [
        {
          "Fn::Equals": [
            {
              "Ref": "AvailabilityZone"
            },
            "random"
          ]
        }
      ]
    {{/condition}}
    {{#condition logicalId="condDefaultAZ"}}
      "Fn::Equals": [
        {
          "Ref": "AvailabilityZone"
        },
        "random"
      ]
    {{/condition}}

    {{#resource logicalId="Subnet"}}
      "Type": "AWS::EC2::Subnet",
      "Properties": {
        "CidrBlock": {
          "Ref": "SubnetCidr"
        },
        "AvailabilityZone": {
          "Fn::If": [
            "condNonDefaultAZ",
            {
              "Ref": "AvailabilityZone"
            },
            {
              "Ref": "AWS::NoValue"
            }
          ]
        },
        "VpcId": {
          "Ref": "VpcId"
        },
        "Tags": [
          {
            "Key": "Name",
            "Value": {
              "Ref": "NameTag"
            }
          }
        ]
      }
    {{/resource}}

    {{#resource logicalId="RouteTableAssociation"}}
      "Type": "AWS::EC2::SubnetRouteTableAssociation",
      "Condition": "condNonDefaultRouteTable",
      "Properties": {
        "RouteTableId": {
          "Ref": "RouteTableId"
        },
        "SubnetId": {
          "Ref": "Subnet"
        }
      }
    {{/resource}}

    {{#output logicalId="SubnetId"}}
      "Value": {
        "Ref": "Subnet"
      }
    {{/output}}

    {{#output logicalId="AvailabilityZone"}}
      "Value": { "Fn::GetAtt" : [ "Subnet", "AvailabilityZone" ] }
    {{/output}}

{{/layout}}