KoogleV4/GameHandler/GameService.cs

using GameModel;
using GameModel.Exceptions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GameHandler
{
    public class GameService
    {
        public const int INFINIT_THROWS = 9999;

        private bool _isStarted = false;
        private ThrowHandler _th;
        private ThrowState _lastState;

        public string ThrowModeName
        {
            get
            {
                if (_lastState != null) 
                {
                    return _lastState.BoardState.ThrowMode == ThrowMode.Decrease ? "Abräumen" : "Volle";
                }
                return string.Empty;
            }
        }

        public ThrowState Start(int GameTypeId=0)
        {
            if (_isStarted)
            {
                throw new InvalidGameStateExcpetion("Game already started");
            }    
            if (!_isStarted)
            {
                _isStarted = true;
            }

            _th = new ThrowHandler();

            var throwMode = GameTypeId == 0 ? ThrowMode.Reposition : ThrowMode.Decrease;
            var throwsPerRount = GameTypeId == 0 ? INFINIT_THROWS : 3;

            _lastState = ThrowState.Create(throwMode, throwsPerRount);
            return _lastState;
        }

        public ThrowState HandleThrow(PinThrow pinThrow) 
        {
            if (!_isStarted)
            {
                throw new InvalidGameStateExcpetion("Game not started");
            }

            _lastState = _th.Update(_lastState, pinThrow);
            return _lastState;
        }

        public void Stop()
        {
            if (!_isStarted)
            {
                throw new InvalidGameStateExcpetion("Game not started");
            }
            _isStarted = false;
        }
    }
}