private bool HasFlush(List<StandartCard> cards, out Hand hand)
{
hand = new Hand();
var grouped = cards
.GroupBy(x => x.Suit, x => x, (suit, enumerable) => new { Suit = suit, Cards = enumerable.ToList() })
.ToList();
if (grouped.Any(x => x.Cards.Count() >= 5))
{
hand = new Hand()
{
Rank = HandRank.Flush,
HandCards = grouped
.First(x => x.Cards.Count() >= 5)
.Cards
.OrderByDescending(x => x.Rank)
.Take(5)
.ToList()
};
return true;
}
return false;
}
private bool HasThreeOfAKind(List<StandartCard> cards, out Hand hand)
{
hand = new Hand();
var grouped = cards.GroupBy(x => x.Rank, x => x,
(rank, enumerable) => new {Rank = rank, Cards = enumerable.ToList()})
.OrderByDescending(x => x.Rank)
.FirstOrDefault(x => x.Cards.Count >= 3);
if (grouped != null)
{
hand = new Hand()
{
Rank = HandRank.ThreeOfAKind,
HandCards = grouped.Cards
};
return true;
}
return false;
}
private bool HasTwoPair(List<StandartCard> cards, out Hand hand)
{
hand = new Hand();
var grouped = cards.GroupBy(x => x.Rank, x => x,
(rank, enumerable) => new { Rank = rank, Cards = enumerable.ToList() })
.OrderByDescending(x => x.Rank)
.Where(x => x.Cards.Count >= 2)
.ToList();
if (grouped.Count >= 2)
{
hand = new Hand()
{
Rank = HandRank.TwoPair,
HandCards = new List<StandartCard>(
new []
{
grouped[0].Cards[0],
grouped[0].Cards[1],
grouped[1].Cards[0],
grouped[1].Cards[1],
})
};
return true;
}
return false;
}
private bool HasStraight(List<StandartCard> cards, out Hand hand)
{
hand = new Hand();
var sorted = cards.OrderByDescending(x => x.Rank).ToList();
for (int i = 0; i <= sorted.Count - 5; i++)
{
var c = sorted.Skip(i).Take(5).ToList();
if (c.Select(x => (int)x.Rank).AreInSequence())
{
hand = new Hand()
{
Rank = HandRank.Straight,
HandCards = c
};
return true;
}
}
return false;
}
private bool HasStraightFlush(List<StandartCard> cards, out Hand hand)
{
hand = new Hand();
var grouped = cards
.GroupBy(x => x.Suit, x=>x,
(suit, enumerable) => new
{
Suit = suit,
Cards = enumerable
.OrderByDescending(x => x.Rank)
.DistinctBy(x => x.Rank).ToList()
})
.ToList();
foreach (var group in grouped)
{
for (int i = 0; i <= group.Cards.Count - 5; i++)
{
var c = group.Cards.Skip(i).Take(5).ToList();
if (c.Select(x => (int)x.Rank).AreInSequence() && c.All(x => x.Suit == c[0].Suit))
{
hand = new Hand()
{
Rank = HandRank.StraightFlush,
HandCards = c
};
return true;
}
}
}
return false;
}
private bool HasRoyalFlush(List<StandartCard> cards, out Hand hand)
{
hand = new Hand();
foreach (Suit suit in Enum.GetValues(typeof(Suit)))
{
var royalFlushHand = cards
.Where(x => x.Suit == suit)
.Where(x => x.Rank >= Rank.Ten)
.DistinctBy(x => x.Rank).ToList().ToList();
if (royalFlushHand.Count == 5)
{
hand.Rank = HandRank.RoyalFlush;
hand.HandCards = royalFlushHand;
return true;
}
}
return false;
}
private bool HasPair(List<StandartCard> cards, out Hand hand)
{
hand = new Hand();
var grouped = cards.GroupBy(x => x.Rank, x => x,
(rank, enumerable) => new { Rank = rank, Cards = enumerable.ToList() })
.OrderByDescending(x => x.Rank)
.Where(x => x.Cards.Count >= 2)
.ToList();
if (grouped.Count >= 1)
{
hand = new Hand()
{
Rank = HandRank.OnePair,
HandCards = grouped.First().Cards.Concat(cards.Where(x => !grouped.First().Cards.Contains(x)).OrderByDescending(x => x.Rank).Take(1)).ToList()
};
return true;
}
return false;
}
private bool HasLowStraightFlush(List<StandartCard> cards, out Hand hand)
{
hand = new Hand();
foreach (Suit suit in Enum.GetValues(typeof(Suit)))
{
var lowStraightFlushHand = cards
.Where(x => x.Suit == suit)
.Where(x => x.Rank <= Rank.Five || x.Rank == Rank.Ace)
.DistinctBy(x => x.Rank).ToList().ToList();
if (lowStraightFlushHand.Count == 5)
{
hand.Rank = HandRank.LowStraightFlush;
hand.HandCards = lowStraightFlushHand;
return true;
}
}
return false;
}
private bool HasLowStraight(List<StandartCard> cards, out Hand hand)
{
hand = new Hand();
var c = cards.Where(x => x.Rank <= Rank.Five || x.Rank == Rank.Ace)
.DistinctBy(x => x.Rank).ToList();
if (c.Count == 5)
{
hand = new Hand()
{
HandCards = c,
Rank = HandRank.LowStraight
};
return true;
}
return false;
}
private bool HasFullHouse(List<StandartCard> cards, out Hand hand)
{
hand = new Hand();
var grouped = cards.GroupBy(x => x.Rank, x => x,
(rank, enumerable) => new { Rank = rank, Cards = enumerable.ToList() })
.OrderByDescending(x => x.Rank)
.Where(x => x.Cards.Count >= 2)
.ToList();
var pair = grouped.FirstOrDefault(x => x.Cards.Count == 2);
var threeOfAKind = grouped.FirstOrDefault(x => x.Cards.Count == 3);
if (pair != null && threeOfAKind != null)
{
hand = new Hand()
{
Rank = HandRank.FullHouse,
HandCards = pair.Cards.Concat(threeOfAKind.Cards).ToList()
};
return true;
}
return false;
}