//
//  ViewController.swift
//  VideoQuickStart
//
//  Copyright © 2016-2017 Twilio, Inc. All rights reserved.
//
import UIKit
import TwilioVideo

class ViewController: UIViewController {
  
    // Configure access token manually for testing, if desired! Create one manually in the console
    // at https://www.twilio.com/user/account/video/dev-tools/testing-tools
    var accessToken = "TWILIO_ACCESS_TOKEN"
  
    // Configure remote URL to fetch token from
    var tokenUrl = "TOKEN_URL"
    
    // Video SDK components
    var room: TVIRoom?
    var localMedia: TVILocalMedia?
    var camera: TVICameraCapturer?
    var localVideoTrack: TVILocalVideoTrack?
    var localAudioTrack: TVILocalAudioTrack?
    var participant: TVIParticipant?
    
    // MARK: UI Element Outlets and handles
    @IBOutlet weak var remoteView: UIView!
    @IBOutlet weak var previewView: UIView!
    @IBOutlet weak var connectButton: UIButton!
    @IBOutlet weak var disconnectButton: UIButton!
    @IBOutlet weak var messageLabel: UILabel!
    @IBOutlet weak var roomTextField: UITextField!
    @IBOutlet weak var roomLine: UIView!
    @IBOutlet weak var roomLabel: UILabel!
    @IBOutlet weak var toggleVideoTransmissionButton: UIButton!
  
    // MARK: UIViewController
    override func viewDidLoad() {
        super.viewDidLoad()

        // LocalMedia represents the collection of tracks that we are sending to other Participants from our VideoClient.
        localMedia = TVILocalMedia()
        // Disconnect button will be displayed when the Client is connected to a Room.
        self.disconnectButton.isHidden = true
        self.roomTextField.delegate = self
        
        let tap = UITapGestureRecognizer(target: self, action: #selector(ViewController.dismissKeyboard))
        self.view.addGestureRecognizer(tap)
    }

    // MARK: IBActions
    @IBAction func connect(sender: AnyObject) {
        // Configure access token either from server or manually.
        // If the default wasn't changed, try fetching from server.
        if (accessToken == "TWILIO_ACCESS_TOKEN") {
            do {
                accessToken = try TokenUtils.fetchToken(url: tokenUrl)
            } catch {
                let message = "Failed to fetch access token"
                logMessage(messageText: message)
                return
            }
        }
       
        
        // Preparing the connect options with the access token that we fetched (or hardcoded).
        let connectOptions = TVIConnectOptions.init(token: accessToken) { (builder) in
            
            // Use the local media that we prepared earlier.
            builder.localMedia = self.localMedia
            
            // The name of the Room where the Client will attempt to connect to. Please note that if you pass an empty
            // Room `name`, the Client will create one for you. You can get the name or sid from any connected Room.
            builder.roomName = self.roomTextField.text
        }
        
        // Connect to the Room using the options we provided.
        room = TVIVideoClient.connect(with: connectOptions, delegate: self)
        
        logMessage(messageText: "Attempting to connect to room \(self.roomTextField.text)")
 
    }
    
    @IBAction func toggleVideoTransmission(sender: AnyObject) {
        logMessage(messageText: "Toggling transmission \(room!.name)")
        self.localVideoTrack?.isEnabled = !(self.localVideoTrack?.isEnabled)!;
    }
   
    // MARK: Private
    func startPreview() {
        if PlatformUtils.isSimulator {
            return
        }

        // Preview our local camera track in the local video preview view.  
        camera = TVICameraCapturer(source: .frontCamera, delegate: self)
        localVideoTrack = localMedia?.addVideoTrack(true, capturer: camera!)
        if (localVideoTrack == nil) {
            logMessage(messageText: "Failed to add video track")
        } 
        // We will flip camera on tap.
        let tap = UITapGestureRecognizer(target: self, action: #selector(ViewController.flipCamera))
        self.previewView.addGestureRecognizer(tap)
        }
    }
}

extension ViewController : TVICameraCapturerDelegate {
    func cameraCapturerPreviewDidStart(_ capturer: TVICameraCapturer) {
        self.camera?.previewView?.frame = self.previewView.bounds;
        self.previewView.addSubview((self.camera?.previewView)!)
    }
}