// Initialize the client
let telnyxClient = TxClient()

// Register to get SDK events
telnyxClient.delegate = self

// Setup yor connection parameters.

// Set the login credentials and the ringtone/ringback configurations if required.
// Ringtone / ringback tone files are not mandatory.
// You can user your sipUser and password
let txConfigUserAndPassowrd = TxConfig(sipUser: sipUser,
                                       password: password,
                                       pushDeviceToken: "DEVICE_APNS_TOKEN",
                                       ringtone: "incoming_call.mp3",
                                       ringBackTone: "ringback_tone.mp3",
                                       //You can choose the appropriate verbosity level of the SDK.
                                       //Logs are disabled by default
                                       logLevel: .all)

// Or use a JWT Telnyx Token to authenticate
let txConfigToken = TxConfig(token: "MY_JWT_TELNYX_TOKEN",
                             pushDeviceToken: "DEVICE_APNS_TOKEN",
                             ringtone: "incoming_call.mp3",
                             ringBackTone: "ringback_tone.mp3",
                             //You can choose the appropriate verbosity level of the SDK. Logs are disabled by default
                             logLevel: .all)

do {
   // Connect and login
   // Use `txConfigUserAndPassowrd` or `txConfigToken`
   try telnyxClient.connect(txConfig: txConfigToken)
} catch let error {
   print("ViewController:: connect Error \(error)")
}

// You can call client.disconnect() when you're done.
Note: you need to relese the delegate manually when you are done.

// Disconnecting and Removing listeners.
telnyxClient.disconnect();

// Release the delegate
telnyxClient.delegate = nil

// Initialize the client
let telnyxClient = TxClient()

// Register to get SDK events
telnyxClient.delegate = self

extension ViewController: TxClientDelegate {

    func onRemoteCallEnded(callId: UUID) {
        // Call has been removed internally.
    }

    func onSocketConnected() {
       // When the client has successfully connected to the Telnyx Backend.
    }

    func onSocketDisconnected() {
       // When the client from the Telnyx backend
    }

    func onClientError(error: Error)  {
        // Something went wrong.
    }

    func onClientReady()  {
       // You can start receiving incoming calls or
       // start making calls once the client was fully initialized.
    }

    func onSessionUpdated(sessionId: String)  {
       // This function will be executed when a sessionId is received.
    }

    func onIncomingCall(call: Call)  {
       // Someone is calling you.
       // This delegate method will be called when the app is in foreground and the Telnyx Client is connected.
    }

    func onPushCall(call: Call) {
       // If you have configured Push Notifications and app is in background or the Telnyx Client is disconnected
       // this delegate method will be called after the push notification is received.
       // Update the current call with the incoming call
       self.currentCall = call 
    }
    

    // You can update your UI from here based on the call states.
    // Check that the callId is the same as your current call.
    func onCallStateUpdated(callState: CallState, callId: UUID) {
      // handle the new call state
      switch (callState) {
      case .CONNECTING:
          break
      case .RINGING:
          break
      case .NEW:
          break
      case .ACTIVE:
          break
      case .DONE:
          break
      case .HELD:
          break
      }
    }
}

   // Create a client instance
   self.telnyxClient = TxClient()

   // Asign the delegate to get SDK events
   self.telnyxClient?.delegate = self

   // Connect the client (Check TxClient class for more info)
   self.telnyxClient?.connect(....)

   // Create the call and start calling
   self.currentCall = try self.telnyxClient?.newCall(callerName: "Caller name",
                                                     callerNumber: "155531234567",
                                                     // Destination is required and can be a phone number or SIP URI
                                                     destinationNumber: "18004377950",
                                                     callId: UUID.init())

//Init your client
func initTelnyxClient() {
   //
   self.telnyxClient = TxClient()

   // Asign the delegate to get SDK events
   self.telnyxClient?.delegate = self

   // Connect the client (Check TxClient class for more info)
   self.telnyxClient?.connect(....)
}

extension ViewController: TxClientDelegate {
    //....
    func onIncomingCall(call: Call) {
        // We are automatically answering any incoming call as an example, but
        // maybe you want to store a reference of the call, and answer the call after a button press.
        self.myCall = call.answer()
    }
}

import PushKit

private var pushRegistry = PKPushRegistry.init(queue: DispatchQueue.main)
...

func initPushKit() {
  pushRegistry.delegate = self
  pushRegistry.desiredPushTypes = Set([.voIP])
}

extension AppDelegate: PKPushRegistryDelegate {

    // New push notification token assigned by APNS.
    func pushRegistry(_ registry: PKPushRegistry, didUpdate credentials: PKPushCredentials, for type: PKPushType) {
        if (type == .voIP) {
            // This push notification token has to be sent to Telnyx when connecting the Client.
            let deviceToken = credentials.token.reduce("", {$0 + String(format: "%02X", $1) })
            UserDefaults.standard.savePushToken(pushToken: deviceToken)
        }
    }

    func pushRegistry(_ registry: PKPushRegistry, didInvalidatePushTokenFor type: PKPushType) {
        if (type == .voIP) {
            // Delete incoming token in user defaults
            let userDefaults = UserDefaults.init()
            userDefaults.deletePushToken()
        }
    }

    /**
     This delegate method is available on iOS 11 and above. 
     */
    func pushRegistry(_ registry: PKPushRegistry, didReceiveIncomingPushWith payload: PKPushPayload, for type: PKPushType, completion: @escaping () -> Void) {
        if (payload.type == .voIP) {
            self.handleVoIPPushNotification(payload: payload)
        }

        if let version = Float(UIDevice.current.systemVersion), version >= 13.0 {
            completion()
        }
    }

    func handleVoIPPushNotification(payload: PKPushPayload) {
        if let metadata = payload.dictionaryPayload["metadata"] as? [String: Any] {

            let callId = metadata["call_id"] as? String
            let callerName = (metadata["caller_name"] as? String) ?? ""
            let callerNumber = (metadata["caller_number"] as? String) ?? ""
            let caller = callerName.isEmpty ? (callerNumber.isEmpty ? "Unknown" : callerNumber) : callerName
            let uuid = UUID(uuidString: callId)
            
            // Re-connect the client and process the push notification when is received.
            // You will need tu use the credentials of the same user that is receiving the call. 
            let txConfig = TxConfig(sipUser: sipUser,
                                password: password,
                                pushDeviceToken: "APNS_PUSH_TOKEN")
                             
            try? telnyxClient?.processVoIPNotification(txConfig: txConfig)

            
            // Report the incoming call to CallKit framework.
            let callHandle = CXHandle(type: .generic, value: from)
            let callUpdate = CXCallUpdate()
            callUpdate.remoteHandle = callHandle
            callUpdate.hasVideo = false

            provider.reportNewIncomingCall(with: uuid, update: callUpdate) { error in
                  if let error = error {
                      print("AppDelegate:: Failed to report incoming call: \(error.localizedDescription).")
                  } else {
                      print("AppDelegate:: Incoming call successfully reported.")
                  }
            }
    }
}

 
 let txConfig = TxConfig(sipUser: sipUser,
                         password: password,
                         pushDeviceToken: "DEVICE_APNS_TOKEN",
                         //You can choose the appropriate verbosity level of the SDK. 
                         logLevel: .all)

 // Or use a JWT Telnyx Token to authenticate
 let txConfigToken = TxConfig(token: "MY_JWT_TELNYX_TOKEN",
                             pushDeviceToken: "DEVICE_APNS_TOKEN",
                             //You can choose the appropriate verbosity level of the SDK. Logs are disabled by default
                             logLevel: .all)

import CallKit

func initCallKit() {
  let configuration = CXProviderConfiguration(localizedName: "TelnyxRTC")
  configuration.maximumCallGroups = 1
  configuration.maximumCallsPerCallGroup = 1
  callKitProvider = CXProvider(configuration: configuration)
  if let provider = callKitProvider {
      provider.setDelegate(self, queue: nil)
  }
}

extension AppDelegate : CXProviderDelegate {

    ...
    
    func provider(_ provider: CXProvider, didActivate audioSession: AVAudioSession) {
        self.telnyxClient?.isAudioDeviceEnabled = true
    }
    
    func provider(_ provider: CXProvider, didDeactivate audioSession: AVAudioSession) {
        self.telnyxClient?.isAudioDeviceEnabled = false
    }
}