main.bicep

@description('The name of the Azure Function app.')
param functionAppName string = 'func-${uniqueString(resourceGroup().id)}'

@description('Storage Account type')
@allowed([
  'Standard_LRS'
  'Standard_GRS'
  'Standard_RAGRS'
])
param storageAccountType string = 'Standard_LRS'

@description('Location for all resources.')
param location string = resourceGroup().location

@description('Location for Application Insights')
param appInsightsLocation string = resourceGroup().location

@description('The language worker runtime to load in the function app.')
@allowed([
  'dotnet'
  'node'
  'python'
  'java'
])
param functionWorkerRuntime string = 'node'

@description('Specifies the OS used for the Azure Function hosting plan.')
@allowed([
  'Windows'
  'Linux'
])
param functionPlanOS string = 'Windows'

@description('Specifies the Azure Function hosting plan SKU.')
@allowed([
  'EP1'
  'EP2'
  'EP3'
])
param functionAppPlanSku string = 'EP1'

@description('The name of the virtual network to be created.')
param vnetName string = 'vnet-${uniqueString(resourceGroup().id)}'

@description('The name of the subnet to be created within the virtual network.')
param subnetName string = 'subnet-${uniqueString(resourceGroup().id)}'

@description('Only required for Linux app to represent runtime stack in the format of \'runtime|runtimeVersion\'. For example: \'python|3.9\'')
param linuxFxVersion string = ''

var vnetAddressPrefix = '10.0.0.0/16'
var subnetAddressPrefix = '10.0.0.0/24'
var hostingPlanName = functionAppName
var applicationInsightsName = functionAppName
var storageAccountName = '${uniqueString(resourceGroup().id)}azfunctions'
var isReserved = ((functionPlanOS == 'Linux') ? true : false)

resource vnet 'Microsoft.Network/virtualNetworks@2022-05-01' = {
  name: vnetName
  location: location
  properties: {
    addressSpace: {
      addressPrefixes: [
        vnetAddressPrefix
      ]
    }
    subnets: [
      {
        name: subnetName
        properties: {
          addressPrefix: subnetAddressPrefix
          delegations: [
            {
              name: 'delegation'
              properties: {
                serviceName: 'Microsoft.Web/serverFarms'
              }
            }
          ]
        }
      }
    ]
  }
}

resource storageAccount 'Microsoft.Storage/storageAccounts@2022-05-01' = {
  name: storageAccountName
  location: location
  sku: {
    name: storageAccountType
  }
  kind: 'Storage'
}

resource hostingPlan 'Microsoft.Web/serverfarms@2022-03-01' = {
  name: hostingPlanName
  location: location
  sku: {
    tier: 'ElasticPremium'
    name: functionAppPlanSku
    family: 'EP'
  }
  properties: {
    maximumElasticWorkerCount: 20
    reserved: isReserved
  }
  kind: 'elastic'
}

resource insight 'Microsoft.Insights/components@2020-02-02' = {
  name: applicationInsightsName
  location: appInsightsLocation
  tags: {
    'hidden-link:${resourceId('Microsoft.Web/sites', applicationInsightsName)}': 'Resource'
  }
  properties: {
    Application_Type: 'web'
  }
  kind: 'web'
}

resource site 'Microsoft.Web/sites@2022-03-01' = {
  name: functionAppName
  location: location
  kind: (isReserved ? 'functionapp,linux' : 'functionapp')
  properties: {
    reserved: isReserved
    serverFarmId: hostingPlan.id
    siteConfig: {
      linuxFxVersion: (isReserved ? linuxFxVersion : json('null'))
      appSettings: [
        {
          name: 'APPINSIGHTS_INSTRUMENTATIONKEY'
          value: insight.properties.InstrumentationKey
        }
        {
          name: 'AzureWebJobsStorage'
          value: 'DefaultEndpointsProtocol=https;AccountName=${storageAccountName};EndpointSuffix= ${environment().suffixes.storage};AccountKey=${storageAccount.listKeys().keys[0].value}'
        }
        {
          name: 'WEBSITE_CONTENTAZUREFILECONNECTIONSTRING'
          value: 'DefaultEndpointsProtocol=https;AccountName=${storageAccountName};EndpointSuffix=${environment().suffixes.storage};AccountKey=${storageAccount.listKeys().keys[0].value};'
        }
        {
          name: 'WEBSITE_CONTENTSHARE'
          value: toLower(functionAppName)
        }
        {
          name: 'FUNCTIONS_EXTENSION_VERSION'
          value: '~4'
        }
        {
          name: 'FUNCTIONS_WORKER_RUNTIME'
          value: functionWorkerRuntime
        }
        {
          name: 'WEBSITE_NODE_DEFAULT_VERSION'
          value: '~14'
        }
      ]
    }
  }
  dependsOn: [
    vnet
  ]
}

resource functionAppName_virtualNetwork 'Microsoft.Web/sites/networkConfig@2022-03-01' = {
  parent: site
  name: 'virtualNetwork'
  properties: {
    subnetResourceId: resourceId('Microsoft.Network/virtualNetworks/subnets', vnetName, subnetName)
    swiftSupported: true
  }
  dependsOn: [
    vnet
  ]
}