HandScore ScoreHand(Card[] hand)
{
HandClass handClass = HandClass.HighCard;
int classRank = 0;
bool flush = hand.GroupBy(c => c.Suit).Max(g => g.Count()) == 5;
bool straight = hand.Select(c => c.Rank).Distinct().Count() == 5 &&
hand.OrderBy(c => c.Rank).Max(c => c.Rank) - hand.OrderBy(c => c.Rank).Min(c => c.Rank) == 4;
if (flush && straight && hand.OrderBy(c => c.Rank).Max().Rank == Ranks.Count-1)
{
handClass=HandClass.RoyalFlush;
classRank = Ranks.Count - 1;
}
else if(flush&&straight)
{
handClass=HandClass.StraightFlush;
classRank = hand.Max(c => c.Rank);
}
else if (hand.GroupBy(c => c.Rank).Max(g => g.Count()) == 4)
{
handClass = HandClass.FourKind;
classRank = hand.GroupBy(c => c.Rank).OrderByDescending(g => g.Count()).First().First().Rank;
}
else if (hand.GroupBy(c => c.Rank).Select(g => g.Count()).All(c => c == 2 || c == 3))
{
handClass = HandClass.FullHouse;
classRank = hand.GroupBy(c => c.Rank).OrderByDescending(g => g.Count()).First().First().Rank;
}
else if (flush)
{
handClass = HandClass.Flush;
classRank = hand.Max(c => c.Rank);
}
else if (straight)
{
handClass = HandClass.Straight;
classRank = hand.Max(c => c.Rank);
}
else if (hand.GroupBy(c => c.Rank).Max(g => g.Count()) == 3)
{
handClass = HandClass.ThreeKind;
classRank = hand.GroupBy(c => c.Rank).OrderByDescending(g => g.Count()).First().First().Rank;
}
else if (hand.GroupBy(c => c.Rank).Count(g => g.Count() == 2) == 2)
{
handClass = HandClass.TwoPair;
classRank = hand.GroupBy(c => c.Rank).Where(g => g.Count() == 2).OrderByDescending(g => g.First().Rank).First().First().Rank;
}
else if (hand.GroupBy(c => c.Rank).Any(g => g.Count() == 2))
{
handClass = HandClass.OnePair;
classRank = hand.GroupBy(c => c.Rank).Where(g => g.Count() == 2).OrderByDescending(g => g.First().Rank).First().First().Rank;
}
return new HandScore {Class = handClass, ClassRank = classRank, HighRank = hand.Max(c => c.Rank)};
}