using System;

using System.Linq;

using System.Collections.Generic;

using System.Text.RegularExpressions;

​

public class Program

{

    private static Game game;

    public static void Main()

    {

        var gameService = new GameService();

        gameService.CreateGame();

    }

}

​

public class GameService

{

    private Game game;

    public void CreateGame()

    {

        game = new Game();

        game.Players = GetPlayers(); 

        foreach (var player in game.Players)

        {

            Console.WriteLine($"{player.ID} {player.Name}");    

        }

        var cardService = new CardService();

        var shuffledDeck = cardService.GetShuffledDeck();

        foreach (var card in shuffledDeck)

        {

            Console.WriteLine($"{card.Value.DisplayText}{card.Suit.DisplayText}");  

        }

    }

    private IEnumerable<User> GetPlayers()

    {

        yield return new User(){ID = 1, Name = "Current User"};

        var numberOfPlayers = 4;

        for (var i = 0; i < numberOfPlayers - 1; i++)

        {

            yield return new User() { ID = i + 2, Name = "User " + (i + 2)};    

        }

    }

}

​

public class CardService

{

    public IEnumerable<Card> GetShuffledDeck()

    {

        var deck = GetDeck().ToArray();

        return Shuffle(deck);

    }

    public IEnumerable<Card> GetDeck()

    {

        var numericValues = Enumerable.Range(2, 9).Select(r => new CardValue() { Value = r, DisplayText = r.ToString()});   

        var alphaNumericValues = new CardValue[] {

            new CardValue() { Value = 11, DisplayText = "J" },

            new CardValue() { Value = 12, DisplayText = "Q" },

            new CardValue() { Value = 13, DisplayText = "K" },

            new CardValue() { Value = 14, DisplayText = "A" },

        };

        var values = numericValues.Concat(alphaNumericValues);

        var suits = new SuitInformation[] 

        {

            new SuitInformation() { Suit = Suit.Spades, DisplayText = "Spades", Value = 1 },    

            new SuitInformation() { Suit = Suit.Diamonds, DisplayText = "Diamonds", Value = 0 },    

            new SuitInformation() { Suit = Suit.Hearts, DisplayText = "Hearts", Value = 0 },    

            new SuitInformation() { Suit = Suit.Clubs, DisplayText = "Clubs", Value = 0 },  

        };

        var i = 0;

        foreach (var suit in suits)

        {

            foreach (var card in values)

            {

                i++;

                yield return new Card()

                {

                    ID = i,

                    Suit = suit,

                    Value = card,

                };  

            }

        }

    }

    static Random r = new Random();

    //  Based on Java code from wikipedia:

    //  http://en.wikipedia.org/wiki/Fisher-Yates_shuffle

    public IEnumerable<Card> Shuffle(IEnumerable<Card> deckToShuffle)

    {

        var deck = deckToShuffle.ToArray();

        for (int n = deck.Length - 1; n > 0; --n)

        {

            int k = r.Next(n+1);

            Card temp = deck[n];

            deck[n] = deck[k];

            deck[k] = temp;

        }

        return deck;

    }

}

​

public class Game

{   

    public IEnumerable<User> Players {get; set;}

}

​

public class User

{

    public int ID {get; set;}

    public string Name {get; set;}

}

​

public class Card

{

    public int ID { get; set; }

    public SuitInformation Suit { get; set; }

    public CardValue    Value { get; set; } 

}

​

public enum Suit

{

    Unspecified,

    Spades,

    Hearts,

    Diamonds,

    Clubs   

}

​

public class SuitInformation

{

    public int Value { get; set;}

    public Suit Suit {get; set;}

    public string   DisplayText { get; set; }   

}

​

public class CardValue 

{

    public int Value {get; set;}

    public string DisplayText {get; set;}

}