//
//  AVPlayerVC.swift
//  WOKA
//
//  Created by Bilal on 05/07/2024.
//

import UIKit
import AVFoundation

class AVPlayerVC: UIViewController {

    @IBOutlet weak var viewControll: UIView!
    @IBOutlet weak var stackCtrView: UIStackView!
    @IBOutlet weak var loadingIndicator: UIActivityIndicatorView!
    
    @IBOutlet weak var sliderStack: UIStackView!
    @IBOutlet weak var tintView: UIView!
    @IBOutlet weak var videoTitle: UILabel!
    
    @IBOutlet weak var karaokeStack: UIStackView!
    @IBOutlet weak var playPauseRecordStack: UIStackView!
    @IBOutlet weak var karaokeLoading: UIActivityIndicatorView!
    @IBOutlet weak var reloadBtn: UIButton!
    
    @IBOutlet weak var img10SecBack: UIImageView! {
        didSet {
            self.img10SecBack.isUserInteractionEnabled = true
            self.img10SecBack.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(onTap10SecBack)))
        }
    }
    @IBOutlet weak var imgPlay: UIImageView! {
        didSet {
            self.imgPlay.isUserInteractionEnabled = true
            self.imgPlay.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(onTapPlayPause)))
        }
    }
    @IBOutlet weak var img10SecFor: UIImageView! {
        didSet {
            self.img10SecFor.isUserInteractionEnabled = true
            self.img10SecFor.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(onTap10SecNext)))
        }
    }
    
    @IBOutlet weak var lbCurrentTime: UILabel!
    @IBOutlet weak var lbTotalTime: UILabel!
    
    
    @IBOutlet weak var seekSlider: UISlider! {
        didSet {
            self.seekSlider.addTarget(self, action: #selector(onTapToSlide), for: .valueChanged)
        }
    }
    
    var videoURL : String?
    var titleVideo : String?
    var vm = AVPlayerVM()

    // MARK: - LifeCycle

    override func viewDidLoad() {
        super.viewDidLoad()
        vm.vc = self
        vm.initView()
        hideShowIndicator(isLoading: true)
        
        viewControll.addTapGesture {
            self.vm.timer?.invalidate()
            self.vm.showHideControls()
        }
    }
    
    override func viewDidAppear(_ animated: Bool) {
        self.vm.setVideoPlayer()
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        self.vm.player?.pause()
        self.vm.player = nil
    }
    
    deinit {
        NotificationCenter.default.removeObserver(self)
        self.vm.player?.currentItem?.removeObserver(self, forKeyPath: "status")
        
        vm.player?.removeObserver(self, forKeyPath: "rate")
        if let playerItem = vm.player?.currentItem {
            playerItem.removeObserver(self, forKeyPath: "isPlaybackBufferEmpty")
            playerItem.removeObserver(self, forKeyPath: "isPlaybackLikelyToKeepUp")
        }
    }
    
    // MARK: - Button Clicks & Tap Handler
    
    @IBAction func reloadBtnTapped(_ sender: UIButton) {
        vm.isFinished = false
        
        vm.reloadVideo()
    }
    
    @IBAction func closeBtnTapped(_ sender: UIButton) {
        self.dismiss(animated: true)
    }
        
    @IBAction func startStopRecording(_ sender: LocalisedElementsButton) {
    }
    
    @IBAction func playPauseBtn(_ sender: LocalisedElementsButton) {
    }
    
    @objc func onTap10SecNext() {
        guard let currentTime = self.vm.player?.currentTime() else { return }
        let seekTime10Sec = CMTimeGetSeconds(currentTime).advanced(by: 10)
        let seekTime = CMTime(value: CMTimeValue(seekTime10Sec), timescale: 1)
        vm.timer?.invalidate()
        vm.timer = nil
        hideShowIndicator(isLoading: true)
        
        self.vm.player?.seek(to: seekTime, completionHandler: { [weak self] completed in
            if completed{
                guard let self else{return}
                hideShowIndicator(isLoading: false)
                vm.startTimer()
            }
        })
    }
    
    @objc func onTap10SecBack() {
        guard let currentTime = self.vm.player?.currentTime() else { return }
        vm.timer?.invalidate()
        vm.timer = nil
        hideShowIndicator(isLoading: true)

        let seekTime10Sec = CMTimeGetSeconds(currentTime).advanced(by: -10)
        let seekTime = CMTime(value: CMTimeValue(seekTime10Sec), timescale: 1)
        self.vm.player?.seek(to: seekTime, completionHandler: { [weak self] completed in
            if completed{
                guard let self else{return}
                hideShowIndicator(isLoading: false)
                vm.startTimer()
            }
        })
    }
    
    func hideShowIndicator(isLoading : Bool){
        if isLoading{
            self.imgPlay.isHidden = true
            self.loadingIndicator.startAnimating()
        }else{
            self.imgPlay.isHidden = false
            self.loadingIndicator.stopAnimating()
            self.loadingIndicator.hidesWhenStopped = true
        }
    }
    
    @objc func onTapPlayPause() {
        if self.vm.player?.timeControlStatus == .playing {
            self.imgPlay.image = UIImage(systemName: "play.circle")
            self.vm.player?.pause()
        } else {
            self.imgPlay.image = UIImage(systemName: "pause.circle")
            self.vm.player?.play()
        }
    }
    
    @objc func onTapToSlide() {
        if vm.timer != nil{
            vm.timer?.invalidate()
            vm.timer = nil
        }
        self.vm.isThumbSeek = true
        guard let duration = self.vm.player?.currentItem?.duration else { return }
        let value = Float64(self.seekSlider.value) * CMTimeGetSeconds(duration)
        if value.isNaN == false {
            let seekTime = CMTime(value: CMTimeValue(value), timescale: 1)
            self.vm.player?.seek(to: seekTime, completionHandler: { completed in
                if completed {
                    self.vm.isThumbSeek = false
                    self.vm.startTimer()
                }
            })
        }
    }
    
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "rate" {
            if let player = object as? AVPlayer {
                if player.rate == 0 {
                    print("Player is paused")
                } else {
                    print("Player is playing")
                    hideShowIndicator(isLoading: false)
                    imgPlay.image = UIImage(systemName: "pause.circle")
                }
            }
        } else if let playerItem = object as? AVPlayerItem {
            if keyPath == "isPlaybackBufferEmpty" {
                if playerItem.isPlaybackBufferEmpty {
                    print("Loading")
                    hideShowIndicator(isLoading: true)
                }
            } else if keyPath == "isPlaybackLikelyToKeepUp" {
                if playerItem.isPlaybackLikelyToKeepUp {
                    print("finished")
                    hideShowIndicator(isLoading: false)
                }
            }
        }
    }
    
//    // Observe for player item status changes
//    override func observeValue(forKeyPath keyPath: String?,
//                               of object: Any?,
//                               change: [NSKeyValueChangeKey : Any]?,
//                               context: UnsafeMutableRawPointer?) {
//        if keyPath == "status" {
//            if let playerItem = object as? AVPlayerItem {
//                switch playerItem.status {
//                case .readyToPlay:
//                    // Ready to play
//                    print("Player item is ready to play.")
//                    vm.player?.play()
//                    hideShowIndicator(isLoading: false)
//                    imgPlay.image = UIImage(systemName: "pause.circle")
//                case .failed:
//                    // Failed
//                    if let error = playerItem.error {
//                        print("Player item error: \(error.localizedDescription)")
//                        vm.handlePlayerError(error)
//                    }
//                case .unknown:
//                    // Unknown status
//                    print("Player item status is unknown.")
//                @unknown default:
//                    // Handle unexpected cases
//                    print("Player item status is unknown.")
//                }
//            }
//        }
//    }
    
//    @objc private func onTapToggleScreen() {
//        if #available(iOS 16.0, *) {
//            guard let windowSceen = self.view.window?.windowScene else { return }
//            if windowSceen.interfaceOrientation == .portrait {
//                windowSceen.requestGeometryUpdate(.iOS(interfaceOrientations: .landscape)) { error in
//                    print(error.localizedDescription)
//                }
//            } else {
//                windowSceen.requestGeometryUpdate(.iOS(interfaceOrientations: .portrait)) { error in
//                    print(error.localizedDescription)
//                }
//            }
//        } else {
//            if UIDevice.current.orientation == .portrait {
//                let orientation = UIInterfaceOrientation.landscapeRight.rawValue
//                UIDevice.current.setValue(orientation, forKey: "orientation")
//            } else {
//                let orientation = UIInterfaceOrientation.portrait.rawValue
//                UIDevice.current.setValue(orientation, forKey: "orientation")
//            }
//        }
//    }
}