//
//  PlayerUIView.swift
//  Werkout_ios
//
//  Created by Trey Tartt on 7/5/23.
//

import SwiftUI
import AVKit

class PlayerUIView: UIView {
    
    // MARK: Class Property
    
    let playerLayer = AVPlayerLayer()
    
    // MARK: Init
    
    override init(frame: CGRect) {
        super.init(frame: frame)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    init(player: AVPlayer) {
        super.init(frame: .zero)
        self.playerSetup(player: player)
    }
    
    deinit {
        NotificationCenter.default.removeObserver(self)
    }
    
    // MARK: Life-Cycle
    
    override func layoutSubviews() {
        super.layoutSubviews()
        playerLayer.frame = bounds
    }
    
    // MARK: Class Methods
    
    private func playerSetup(player: AVPlayer) {
        playerLayer.player = player
        player.actionAtItemEnd = .none
        layer.addSublayer(playerLayer)
        
        self.setObserver()
    }
    
    func setObserver() {
        NotificationCenter.default.removeObserver(self)
        NotificationCenter.default.addObserver(self, selector: #selector(playerItemDidReachEnd(notification:)),
                                               name: .AVPlayerItemDidPlayToEndTime,
                                               object: playerLayer.player?.currentItem)
    }
    
    @objc func playerItemDidReachEnd(notification: Notification) {
        if let playerItem = notification.object as? AVPlayerItem {
            playerItem.seek(to: .zero, completionHandler: nil)
            self.playerLayer.player?.play()
        }
    }
}

struct PlayerView: UIViewRepresentable {
    
    @Binding var player: AVPlayer
    
    func makeUIView(context: Context) -> PlayerUIView {
        return PlayerUIView(player: player)
    }
    
    func updateUIView(_ uiView: PlayerUIView, context: UIViewRepresentableContext<PlayerView>) {
        uiView.playerLayer.player = player
        
        //Add player observer.
        uiView.setObserver()
    }
}