using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        using (var game = new PickupGame(maxPlayers: 4, output: Console.Out))

        {

            game.Add("Rachel Riley");

            game.Add("olli");

            game.GameName = "Chess";

            game.SetMaxPlayers(4);

            game.Add("peter");

            game.Add("paul");

            game.Add("simon");

            Console.WriteLine(game);

            game.Add("pedro");

            Console.WriteLine(game);

            game.Add("peter");

            game.Add("pedro");

        }

​

        using (var game = new PickupGame(maxPlayers: 2, output: Console.Out))

        {

        }

    }

​

    public class PickupGame : IDisposable

    {

        public int MaxPlayers

        {

            get;

            private set;

        }

​

        public string GameName

        {

            get;

            set;

        }

​

        private List<string> _players;

        private TextWriter _stream;

        public PickupGame(int maxPlayers, string gameName = "Pickup Game", TextWriter output = null)

        {

            _players = new List<string>();

            _stream = output ?? Console.Out;

            GameName = gameName;

            SetMaxPlayers(maxPlayers);

        }

​

        public void Add(string name)

        {

            if (_players.Contains(name))

            {

                _stream.WriteLine(string.Format("{0} tried to join a game they are already in.", name));

            }

            else if (_players.Count < MaxPlayers)

            {

                _players.Add(name);

                _stream.WriteLine(string.Format("{0} was added to the game.", name));

            }

​

            CheckPlayerCount();

        }

​

        public void CheckPlayerCount()

        {

            if (_players.Count == MaxPlayers)

            {

                _stream.WriteLine(string.Format("{0} should come server.", GetNames()));

                ClearList();

            }

        }

​

        public void SetMaxPlayers(int maxPlayers)

        {

            if (maxPlayers <= 1)

                throw new ArgumentOutOfRangeException(nameof(maxPlayers));

            MaxPlayers = maxPlayers;

            ClearList();

        }

​

        public void ClearList()

        {

            _players.Clear();

            _stream.WriteLine("{0} for {1} players was created.", GameName, MaxPlayers);

        }

​

        public string GetNames()

        {

            if (!_players.Any())

                return null;

            var names = string.Join(", ", _players.Take(_players.Count - 1));

            return string.Format("{0} and {1}", names, _players.Last());

        }

​

        public void Cancel()

        {

            var names = _players.Any() ? string.Format(" with {0}", GetNames()) : null;

            _stream.WriteLine(string.Format("{0} was cancelled because nobody wants to play{1}.", GameName, names));

        }

​

        public override string ToString()

        {

            if (_players.Any())

                return string.Format("{0} between {1}.", GameName, GetNames());

            return string.Format("{0} with no players.", GameName);

        }

​

        public void Dispose()

        {

            Cancel();

        }

    }

}