/*

 Copyright (C) 2016 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 The `ViewController` manages an array of players, compares the players scores and display the information of the player with the highest score.

 */

import Cocoa

private var myContext = 0

class ViewController: NSViewController {

    // MARK: Properties

    @IBOutlet weak var tableview: NSTableView!

    @IBOutlet weak var highScore: NSTextField!

    @IBOutlet var playersController: NSArrayController!

    dynamic var players = [PlayerInfo]()

    // MARK: NSViewController

    override func viewDidLoad() {

        super.viewDidLoad()

        if let savedPlayersData = UserDefaults.standard.object(forKey: "players") as? Data {

            players = NSKeyedUnarchiver.unarchiveObject(with: savedPlayersData) as! [PlayerInfo]

        }

        else {

            // Create a default set of players.

            players.append(PlayerInfo(name: "Aya", score: 8))

            players.append(PlayerInfo(name: "Joaquim", score: 3))

            players.append(PlayerInfo(name: "Rana", score: 5))

        }

        // Observe changes to the `playersController`'s content.

        playersController.addObserver(self, forKeyPath: "arrangedObjects.score", options: [.new, .initial], context: &myContext)

        playersController.addObserver(self, forKeyPath: "arrangedObjects.name", options: [.new, .initial], context: &myContext)

    }

    override func observeValue(forKeyPath keyPath: String?, of object: AnyObject?, change: [NSKeyValueChangeKey : AnyObject]?, context: UnsafeMutablePointer<Swift.Void>?) {

        guard context == &myContext else { return }

        // Compare players score and display the best player information.

        let bestPlayer = players.sorted(by: { player1, player2 -> Bool in

            return player1.score > player2.score

        }).first

        if let bestPlayer = bestPlayer {

            /*

                `localizedStringWithFormat` will surround %@ with unicode isolates

                characters to display bidirectional text correctecly.

            */

            highScore.stringValue = NSString.localizedStringWithFormat("%@ has the highest score %d!", bestPlayer.name, bestPlayer.score) as String

        }

        // Save the updated player data.

        let data = NSKeyedArchiver.archivedData(withRootObject: players)

        let defaults = UserDefaults.standard

        defaults.set(data, forKey: "players")

    }

    deinit {

        playersController.removeObserver(self, forKeyPath: "arrangedObjects.score")

        playersController.removeObserver(self, forKeyPath: "arrangedObjects.name")

    }

    // MARK: Interface Builder actions

    @IBAction func addRemovePlayer(sender: AnyObject) {

        if sender.selectedSegment == 0 {

            // The user clicked to add a new player.

            players.append(PlayerInfo(name: "Enter Name", score: 0))

            tableview.editColumn(0, row: tableview.numberOfRows - 1, with: nil, select: true)

        } else if tableview.selectedRow >= 0 {

            // The user clicked to remove the selected player.

            playersController.remove(atArrangedObjectIndex: tableview.selectedRow)

        }

    }

}