// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

@description('The name of the API Management service instance')
param apiManagementName string = 'apiservice${uniqueString(resourceGroup().id)}'

@description('The email address of the owner of the service')
@minLength(1)
param publisherEmail string

@description('The name of the owner of the service')
@minLength(1)
param publisherName string

@description('The pricing tier of this API Management service')
@allowed([
  'Developer'
  'Premium'
])
param sku string = 'Premium'

@description('The instance size of this API Management service. This should be a multiple of the number of availability zones getting deployed.')
param skuCount int = 2

@description('Virtual network name')
param virtualNetworkName string = 'apimvnet'

@description('Application Insights resource name')
param appInsightsName string = 'apim-appi'

@description('Application Insights public network access for ingestion')
param appInsightsPublicNetworkAccessForIngestion string = 'Disabled'

@description('Address prefix')
param virtualNetworkAddressPrefix string = '10.0.0.0/12'

@description('Subnet prefix')
param subnetPrefix string = '10.0.0.0/24'

@description('Subnet name')
param subnetName string = 'apim'

@description('Service endpoints enabled on the API Management subnet')
param apimSubnetServiceEndpoints array = [
  {
    service: 'Microsoft.Storage'
  }
  {
    service: 'Microsoft.Sql'
  }
  {
    service: 'Microsoft.EventHub'
  }
]

@description('Azure region where the resources will be deployed')
param location string = resourceGroup().location

@description('Numbers for availability zones, for example, 1,2,3.')
param availabilityZones array = [
  '1'
  '2'
]

@description('Name for the public IP address used to access the API Management service.')
param publicIpName string = 'apimPublicIP'

@description('SKU for the public IP address used to access the API Management service.')
@allowed([
  'Standard'
])
param publicIpSku string = 'Standard'

@description('Allocation method for the public IP address used to access the API Management service. Standard SKU public IP requires `Static` allocation.')
@allowed([
  'Static'
])
param publicIPAllocationMethod string = 'Static'

@description('Unique DNS name for the public IP address used to access the API management service.')
param dnsLabelPrefix string = toLower('${publicIpName}-${uniqueString(resourceGroup().id)}')

@description('The workspace id of the Log Analytics resource.')
param logAnalyticsWorkspaceId string

var subnetRef = resourceId('Microsoft.Network/virtualNetworks/subnets', virtualNetworkName, subnetName)

@description('Name of the NSG for the API Management service.')
param nsgName string = 'apim-nsg-${uniqueString(resourceGroup().id)}'

resource nsg 'Microsoft.Network/networkSecurityGroups@2020-06-01' = {
  name: nsgName
  location: location
  properties: {
    securityRules: [
      {
        name: 'Client_communication_to_API_Management'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '80'
          sourceAddressPrefix: 'Internet'
          destinationAddressPrefix: 'VirtualNetwork'
          access: 'Allow'
          priority: 100
          direction: 'Inbound'
        }
      }
      {
        name: 'Secure_Client_communication_to_API_Management'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '443'
          sourceAddressPrefix: 'Internet'
          destinationAddressPrefix: 'VirtualNetwork'
          access: 'Allow'
          priority: 110
          direction: 'Inbound'
        }
      }
      {
        name: 'Management_endpoint_for_Azure_portal_and_Powershell'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '3443'
          sourceAddressPrefix: 'ApiManagement'
          destinationAddressPrefix: 'VirtualNetwork'
          access: 'Allow'
          priority: 120
          direction: 'Inbound'
        }
      }
      {
        name: 'Dependency_on_Redis_Cache'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '6381-6383'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'VirtualNetwork'
          access: 'Allow'
          priority: 130
          direction: 'Inbound'
        }
      }
      {
        name: 'Dependency_to_sync_Rate_Limit_Inbound'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '4290'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'VirtualNetwork'
          access: 'Allow'
          priority: 135
          direction: 'Inbound'
        }
      }
      {
        name: 'Dependency_on_Azure_SQL'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '1433'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'Sql'
          access: 'Allow'
          priority: 140
          direction: 'Outbound'
        }
      }
      {
        name: 'Dependency_for_Log_to_event_Hub_policy'
        properties: {
          protocol: '*'
          sourcePortRange: '*'
          destinationPortRange: '5671'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'EventHub'
          access: 'Allow'
          priority: 150
          direction: 'Outbound'
        }
      }
      {
        name: 'Dependency_on_Redis_Cache_outbound'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '6381-6383'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'VirtualNetwork'
          access: 'Allow'
          priority: 160
          direction: 'Outbound'
        }
      }
      {
        name: 'Depenedency_To_sync_RateLimit_Outbound'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '4290'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'VirtualNetwork'
          access: 'Allow'
          priority: 165
          direction: 'Outbound'
        }
      }
      {
        name: 'Dependency_on_Azure_File_Share_for_GIT'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '445'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'Storage'
          access: 'Allow'
          priority: 170
          direction: 'Outbound'
        }
      }
      {
        name: 'Azure_Infrastructure_Load_Balancer'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '6390'
          sourceAddressPrefix: 'AzureLoadBalancer'
          destinationAddressPrefix: 'VirtualNetwork'
          access: 'Allow'
          priority: 180
          direction: 'Inbound'
        }
      }
      {
        name: 'Publish_DiagnosticLogs_And_Metrics'
        properties: {
          description: 'API Management logs and metrics for consumption by admins and your IT team are all part of the management plane'
          protocol: 'Tcp'
          sourcePortRange: '*'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'AzureMonitor'
          access: 'Allow'
          priority: 185
          direction: 'Outbound'
          destinationPortRanges: [
            '443'
            '12000'
            '1886'
          ]
        }
      }
      {
        name: 'Connect_To_SMTP_Relay_For_SendingEmails'
        properties: {
          description: 'APIM features the ability to generate email traffic as part of the data plane and the management plane'
          protocol: 'Tcp'
          sourcePortRange: '*'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'Internet'
          access: 'Allow'
          priority: 190
          direction: 'Outbound'
          destinationPortRanges: [
            '25'
            '587'
            '25028'
          ]
        }
      }
      {
        name: 'Authenticate_To_Azure_Active_Directory'
        properties: {
          description: 'Connect to Azure Active Directory for developer Portal authentication or for OAuth 2 flow during any proxy authentication'
          protocol: 'Tcp'
          sourcePortRange: '*'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'AzureActiveDirectory'
          access: 'Allow'
          priority: 200
          direction: 'Outbound'
          destinationPortRanges: [
            '80'
            '443'
          ]
        }
      }
      {
        name: 'Dependency_on_Azure_Storage'
        properties: {
          description: 'API Management service dependency on Azure blob and Azure table storage'
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '443'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'Storage'
          access: 'Allow'
          priority: 100
          direction: 'Outbound'
        }
      }
      {
        name: 'Publish_Monitoring_Logs'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '443'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'AzureCloud'
          access: 'Allow'
          priority: 300
          direction: 'Outbound'
        }
      }
      {
        name: 'Deny_All_Internet_Outbound'
        properties: {
          protocol: '*'
          sourcePortRange: '*'
          destinationPortRange: '*'
          sourceAddressPrefix: 'VirtualNetwork'
          destinationAddressPrefix: 'Internet'
          access: 'Deny'
          priority: 999
          direction: 'Outbound'
        }
      }
    ]
  }
}

resource publicIp 'Microsoft.Network/publicIPAddresses@2020-05-01' = {
  name: publicIpName
  location: location
  sku: {
    name: publicIpSku
  }
  properties: {
    publicIPAllocationMethod: publicIPAllocationMethod
    publicIPAddressVersion: 'IPv4'
    dnsSettings: {
      domainNameLabel: dnsLabelPrefix
    }
  }
}

resource virtualNetwork 'Microsoft.Network/virtualNetworks@2020-06-01' = {
  name: virtualNetworkName
  location: location
  properties: {
    addressSpace: {
      addressPrefixes: [
        virtualNetworkAddressPrefix
      ]
    }
    subnets: [
      {
        name: subnetName
        properties: {
          addressPrefix: subnetPrefix
          networkSecurityGroup: {
            id: nsg.id
          }
          serviceEndpoints: apimSubnetServiceEndpoints
        }
      }
    ]
  }
}

resource apiManagementService 'Microsoft.ApiManagement/service@2021-08-01' = {
  name: apiManagementName
  location: location
  sku: {
    name: sku
    capacity: skuCount
  }
  zones: ((length(availabilityZones) == 0) ? null : availabilityZones)
  properties: {
    publisherEmail: publisherEmail
    publisherName: publisherName
    virtualNetworkType: 'External'
    publicIpAddressId: publicIp.id
    virtualNetworkConfiguration: {
      subnetResourceId: subnetRef
    }
    customProperties: {
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_GCM_SHA256': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_256_CBC_SHA256': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_CBC_SHA256': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_256_CBC_SHA': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TLS_RSA_WITH_AES_128_CBC_SHA': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TripleDes168': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls10': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls11': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Ssl30': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls10': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls11': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Ssl30': 'false'
      'Microsoft.WindowsAzure.ApiManagement.Gateway.Protocols.Server.Http2': 'false'
    }
  }
  dependsOn: [
    virtualNetwork
  ]
}

resource apimLogger 'Microsoft.ApiManagement/service/loggers@2022-08-01' = {
  name: appInsights.name
  parent: apiManagementService
  properties: {
    resourceId: appInsights.id
    description: 'Application Insights for APIM'
    loggerType: 'applicationInsights'
    credentials: {
      instrumentationKey: appInsights.properties.InstrumentationKey
    }
  }
}

resource apimDiagnostics 'Microsoft.ApiManagement/service/diagnostics@2022-08-01' = {
  name: 'applicationinsights'
  parent: apiManagementService
  properties: {
    loggerId: apimLogger.id
    alwaysLog: 'allErrors'
    verbosity: 'information'
    sampling: {
      percentage: 100
      samplingType: 'fixed'
    }
  }
}

resource appInsights 'Microsoft.Insights/components@2020-02-02' = {
  name: appInsightsName
  location: location
  kind: 'web'
  properties: {
    Application_Type: 'web'
    WorkspaceResourceId: logAnalyticsWorkspaceId
    publicNetworkAccessForIngestion: appInsightsPublicNetworkAccessForIngestion
    publicNetworkAccessForQuery: 'Enabled'
  }
}

output apimIPs array = apiManagementService.properties.publicIPAddresses
output apimGatewayUrl string = apiManagementService.properties.gatewayUrl
output appInsightsName string = appInsights.name
output appInsightsId string = appInsights.id
output appInsightsConnectionString string = appInsights.properties.ConnectionString
output name string = apiManagementService.name
output vnetName string = virtualNetwork.name
output vnetId string = virtualNetwork.id
output defaultSubnetId string = virtualNetwork.properties.subnets[0].id
output hostnameConfigs array = apiManagementService.properties.hostnameConfigurations