{
  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "peer": {
      "type": "bool",
      "allowedValues": [ true, false ],
      "defaultValue": false
    },
    "hub": {
      "type": "object",
      "defaultValue": {
        "resourceGroup": "core",
        "vnet": {
          "name": "core"
        }
      },
      "metadata": {
            "description": "Info for an existing hub or core vNet.  Required if peer==true.  Assumed to be within the same subscription."
      }
    },
    "spoke": {
      "type": "object",
      "defaultValue": {
        "vnet": {
          "name": "Spoke",
          "addressPrefixes": [ "10.99.0.0/16" ]
        },
        "subnets": [
          { "name": "subnet1", "addressPrefix": "10.99.0.0/24" },
          { "name": "subnet2", "addressPrefix": "10.99.1.0/24" }
        ]
      },
      "metadata": {
        "description": "Complex object containing information for the spoke vNet.  See defaultValue for example."
      }
    }
  },
  "variables": {
    "hubID": "[if(parameters('peer'), resourceId(parameters('hub').resourceGroup, 'Microsoft.Network/virtualNetworks/', parameters('hub').vnet.name), '')]",
    "spokeID": "[resourceId('Microsoft.Network/virtualNetworks/', parameters('spoke').vnet.name)]",
    "copy": [
        {
            "name": "subnets",
            "count": "[length(parameters('spoke').subnets)]",
            "input": {
              "name": "[parameters('spoke').subnets[copyIndex('subnets')].name]",
              "addressPrefix": "[parameters('spoke').subnets[copyIndex('subnets')].addressPrefix]",
              "id": "[concat(resourceId('Microsoft.Network/virtualNetworks/', parameters('spoke').vnet.name), '/subnets/', parameters('spoke').subnets[copyIndex('subnets')].name)]"
            }
        }
    ]
  },
  "resources": [
    {
      "name": "[concat(parameters('spoke').vnet.name)]",
      "type": "Microsoft.Network/virtualNetworks",
      "apiVersion": "2017-10-01",
      "location": "[resourceGroup().location]",
      "properties": {
        "addressSpace": {
          "addressPrefixes": "[parameters('spoke').vnet.addressPrefixes]"
        },
        "copy": [{
          "name": "subnets",
          "count": "[length(parameters('spoke').subnets)]",
          "input": {
            "name": "[parameters('spoke').subnets[copyIndex('subnets')].name]",
            "properties": {
              "addressPrefix": "[parameters('spoke').subnets[copyIndex('subnets')].addressPrefix]"
            }
          }
        }]
      }
    },
    {
      "condition": "[parameters('peer')]",
      "name": "[concat(parameters('spoke').vnet.name, '/peering-to-', parameters('hub').vnet.name)]",
      "type": "Microsoft.Network/virtualNetworks/virtualNetworkPeerings",
      "apiVersion": "2017-10-01",
      "location": "[resourceGroup().location]",
      "dependsOn": [
        "[variables('spokeID')]"
      ],
      "properties": {
        "allowVirtualNetworkAccess": true,
        "allowForwardedTraffic": false,
        "allowGatewayTransit": false,
        "useRemoteGateways": false,
        "remoteVirtualNetwork": {
          "id": "[variables('hubID')]"
        }
      }
    },
    {
      "condition": "[parameters('peer')]",
      "name": "[concat('peer-', parameters('hub').vnet.name, '-to-', parameters('spoke').vnet.name)]",
      "type": "Microsoft.Resources/deployments",
      "apiVersion": "2017-05-10",
      "resourceGroup": "[parameters('hub').resourceGroup]",
      "dependsOn": [
        "[variables('spokeID')]"
      ],
      "properties": {
        "mode": "Incremental",
        "template": {
          "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
          "contentVersion": "1.0.0.0",
          "parameters": {},
          "variables": {},
          "resources": [
              {
                "apiVersion": "2017-10-01",
                "type": "Microsoft.Network/virtualNetworks/virtualNetworkPeerings",
                "name": "[concat(parameters('hub').vnet.name, '/peering-to-', parameters('spoke').vnet.name)]",
                "location": "[resourceGroup().location]",
                "properties": {
                    "allowVirtualNetworkAccess": true,
                    "allowForwardedTraffic": false,
                    "allowGatewayTransit": true,
                    "useRemoteGateways": false,
                    "remoteVirtualNetwork": {
                      "id": "[variables('spokeID')]"
                    }
                }
              }
          ]
        }
      }
    }
  ],
  "outputs": {
    "peer": {
      "type": "bool",
      "value": "[parameters('peer')]"
    },
    "hubID": {
      "type": "string",
      "value": "[variables('hubID')]"
    },
    "spokeID": {
      "type": "string",
      "value": "[variables('spokeID')]"
    },
    "subnets": {
      "type": "array",
      "value": "[variables('subnets')]"
    }
  }
}