KoogleV4/GameHandler/GameHandler/FreeGameHandler.cs

using GameModel;
using GameModel.Contract;
using GameModel.Contracts;
using GameModel.FreeGame;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GameHandler.GameHandler
{
    public class FreeGameHandler : IGameHandler
    {
        public const string GAMENAME_FREETRAINING = "Freies Spiel";

        public event EventHandler GameExpenseOccured;

        public static string GameName()
        {
            return GAMENAME_FREETRAINING;
        }

        public int GetCurrentPlayerId(IGameModel gameModel)
        {
            var gm = gameModel as FreeGameModel;
            return gm.LastPlayerId;
        }

        public IGameModel InitGameModel(int[] playerIds, IGameSettings gameSettings)
        {
            var throws = new List<FreeGameThrow>(playerIds.Select(_ => FreeGameThrow.Create(_))).ToArray();           
            return new FreeGameModel(playerIds, playerIds.First(), throws);
        }

        public IGameModel Update(PinThrow pinThrow, IGameModel gameModel, BoardState boardStateBeforeUpdate, 
            ThrowState throwStateAfterUpdate, Guid gameStateId)
        {
            if (gameModel == null)
            {
                throw new ArgumentNullException("gameModel cannto be null");
            }

            var gm = gameModel as FreeGameModel;

            var throws = gm.Throws.ToList();
            var model = throws.FirstOrDefault(_ => _.PlayerId == pinThrow.PlayerId);
            if (model == null)
            {
                throw new FreeGameThrowExcepetion("game model not initialized");
            }
            var model2 = model + pinThrow;
            var idx = throws.IndexOf(model);
            throws.Remove(model);
            throws.Insert(idx, model2);

            return gm with { LastPlayerId = pinThrow.PlayerId, Throws = throws.ToArray() }; 
        }
    }
}