software-projekt-2-gold-wars/GoldWars/GoldWars/MatchmakingHelper.swift

//
//  MatchmakingHelper.swift
//  GoldWars
//
//  Created by Chauntalle Schüle, Ömer Özel, Eray Kör on 03.05.20.
//  Copyright © 2020 SP2. All rights reserved.
//

import GameKit

protocol GameKitHelperDelegate {
    func matchStarted()
  //  func matchEnded()
  //  func matchReceivedData(match: GKMatch, data: NSData,
  //  fromPlayer player: String)
    
}

class MatchmakingHelper: NSObject, GKMatchmakerViewControllerDelegate, GKMatchDelegate {
   
    var delegate: GameKitHelperDelegate? //will receive all multiplayer events
    var mpMatch: GKMatch? //represents network
    var viewController: UIViewController?
    var mpMatchStarted: Bool
    var isServer: Bool
    var serverPlayer: GKPlayer?
    var menusc: MenuScene?
    let localPlayer: GKLocalPlayer = GKLocalPlayer.local
    
    static let sharedInstance = MatchmakingHelper()
    
    
    static var isAuthenticated: Bool{
        return GKLocalPlayer.local.isAuthenticated
    }
    
    override init() {
        mpMatchStarted = false
        isServer = false
        super.init()
    }
    
    func presentMatchmaker(scene: MenuScene) {
        menusc = scene
        print("I'm in 43")
        guard GKLocalPlayer.local.isAuthenticated else {
            print("Player ist nicht authentifiziert")
            return
        }
        let request = GKMatchRequest()
        
        request.minPlayers = 2
        request.maxPlayers = 2
        request.inviteMessage = "Willst du GoldWars spielen?"
        
        let matchmakerVC = GKMatchmakerViewController.init(matchRequest: request)
        matchmakerVC!.matchmakerDelegate = self
        viewController?.present(matchmakerVC!, animated: true, completion: nil)
    }
    
    func findMatchWithMinPlayers(minPlayers: Int, maxPlayers: Int, viewController: UIViewController, delegate: GameKitHelperDelegate){
        
        guard GKLocalPlayer.local.isAuthenticated else {
            print("Player ist nicht authentifiziert")
            return
        }
        
        let request = GKMatchRequest.init()
        request.minPlayers = minPlayers
        request.maxPlayers = maxPlayers
        
        let matchmakerVC = GKMatchmakerViewController.init(matchRequest: request)
        matchmakerVC!.matchmakerDelegate = self
        
        viewController.present(matchmakerVC!, animated: true, completion: nil)
    }
    
    //The user has cancelled matchmaking
    func matchmakerViewControllerWasCancelled(_ viewController: GKMatchmakerViewController) {
        print("I'm in 78")
        viewController.dismiss(animated: true, completion: nil)
      //  delegate?.matchEnded()
    }
    
    //Matchmaking has failed with an error
    func matchmakerViewController(_ viewController: GKMatchmakerViewController, didFailWithError error: Error) {
        print("I'm in 85")
        viewController.dismiss(animated: true, completion: nil)
        print("Error finding match", error.localizedDescription)
      //  delegate?.matchEnded()
    }
    
    // A peer-to-peer match has been found, the game should start
    func matchmakerViewController(_ viewController: GKMatchmakerViewController, didFind match: GKMatch) {
        print("I'm in 93")
        viewController.dismiss(animated: true, completion: nil)
        mpMatch = match
        match.delegate = self
        //expectedPlayerCount : The remaining number of players who have not yet connected to the match
        if !mpMatchStarted && match.expectedPlayerCount == 0 {
            print("Bereit das Spiel zu starten!")
            startMatch()
        }
    }
    
    // The match received data sent from the player.
    private func match(match: GKMatch!, didReceiveData data: NSData!,fromPlayer playerID: String!) {
        print("I'm in 106")
        
        if mpMatch != match { return }
       // delegate?.matchReceivedData(match: match, data: data, fromPlayer:
        //    playerID)
        
    }
   
    private func match(match: GKMatch!, didFailWithError error: NSError!) {
        print("Cant connect to any other player")
        if mpMatch != match {
            return
        }
        mpMatchStarted = false
        //delegate?.matchEnded()
    }
    
    // The player state changed (eg. connected or disconnected)
    func match(_ match: GKMatch, player: GKPlayer, didChange state: GKPlayerConnectionState) {
        print("I'm in 123")
        if mpMatch != match {
            return
        }
    
        switch (state) {
            case GKPlayerConnectionState.connected:
                print("Player connected!")
    
                if (!mpMatchStarted && match.expectedPlayerCount == 0) {
                    print("Ready to start match!")
                    startMatch()
                }
        case GKPlayerConnectionState.disconnected:
                print("Player disconnected!")
                mpMatchStarted = false
            //    delegate?.matchEnded()
        default:
                print("Player unknown status!")
        }
    }
    
    func startMatch() {
        mpMatch!.chooseBestHostingPlayer(completionHandler: {
            (player) in
            print("I'm in 147")
            self.mpMatchStarted = true
            print(self.mpMatchStarted)
            if player == GKLocalPlayer.local {
                print("I am the server")
                self.isServer = true
            } else {
                print("I am a client")
                self.isServer = false
                self.serverPlayer = player
                
            }
           /// self.delegate?.matchStarted()
            print("spiel gefunden")
            self.menusc!.loadScene(scene: GameScene(size: self.menusc!.size))
            print("scene müsste gewechselt sein")
        })
    }
    
    func disconnect() {
        print("I'm in 164")
        if mpMatch != nil {
            mpMatch?.disconnect()
        }
    }
}