MauMau-Server/Mau/Card.cs

namespace MauMau_Server.Mau;

public class Card
{
    public readonly CardType CardType;
    public readonly CardValue CardValue;

    public Card(CardType cardType, CardValue cardValue)
    {
        CardType = cardType;
        CardValue = cardValue;
    }

    public override string ToString()
    {
        return $"{CardType} {CardValue}";
    }

    public Card parseCard(string card)
    {
        var cardType = card.Split(" ")[0];
        var cardValue = card.Split(" ")[1];
        return new Card((CardType)Enum.Parse(typeof(CardType), cardType),
            (CardValue)Enum.Parse(typeof(CardValue), cardValue));
    }
}

public static class CardExtensions
{
    public static bool IsSameCard(this Card card1, Card card2)
    {
        return card1.IsSameCardType(card2) && card1.IsSameCardValue(card2);
    }

    public static bool IsSameCardType(this Card card1, Card card2)
    {
        return card1.CardType == card2.CardType;
    }

    public static bool IsSameCardValue(this Card card1, Card card2)
    {
        return card1.CardValue == card2.CardValue;
    }

    public static bool CanBePlayedOn(this Card playedCard, Card currentCard)
    {
        return playedCard.IsSameCardType(currentCard)
               || playedCard.IsSameCardValue(currentCard)
               || playedCard.CardType == CardType.JOKER;
    }

    public static bool IsSpecialCard(this Card card)
    {
        return card.IsMauCard() || card.CardValue is
            CardValue.SEVEN or
            CardValue.EIGHT or
            CardValue.JACK or
            CardValue.KING or
            CardValue.ACE;
    }

    public static bool IsMauCard(this Card card)
    {
        return card.CardType == CardType.JOKER || card.CardValue is CardValue.TWO;
    }
}

public enum CardType
{
    SPADES,
    HEARTS,
    DIAMONDS,
    CLUBS,
    JOKER
}

public enum CardValue
{
    TWO,
    THREE,
    FOUR,
    FIVE,
    SIX,
    SEVEN,
    EIGHT,
    NINE,
    TEN,
    JACK,
    QUEEN,
    KING,
    ACE,
    RED,
    BLACK
}