import UIKit
import AVFoundation
import AVKit

class ViewController: UIViewController, AVPlayerViewControllerDelegate {

    var playerController : AVPlayerViewController!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()
    }

    @IBAction func play(_ sender: Any) {

        let path = Bundle.main.path(forResource: "Apple", ofType: "mp4")!

        let url = NSURL(fileURLWithPath: path)

        let player = AVPlayer(url: url as URL)

        playerController = AVPlayerViewController()

        NotificationCenter.default.addObserver(self, selector: #selector(ViewController.didfinishPlaying(note:)), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: player.currentItem)

        playerController.player = player

        playerController.allowsPictureInPicturePlayback = true

        playerController.delegate = self

        playerController.player?.play()

        self.present(playerController, animated: true, completion : nil)


    }

    @objc func didfinishPlaying(note : NSNotification)  {

        playerController.dismiss(animated: true, completion: nil)
        let alertView = UIAlertController(title: "Finished", message: "Video finished", preferredStyle: .alert)
        alertView.addAction(UIAlertAction(title: "Okey", style: .default, handler: nil))
        self.present(alertView, animated: true, completion: nil)
    }


    func playerViewController(_ playerViewController: AVPlayerViewController, restoreUserInterfaceForPictureInPictureStopWithCompletionHandler completionHandler: @escaping (Bool) -> Void) {

        let currentviewController = navigationController?.visibleViewController

        if currentviewController != playerViewController{

            currentviewController?.present(playerViewController, animated: true, completion: nil)

        }

    }



}