public static bool IsFlush(Card[] hand)
{
hand = hand.OrderBy(item =>
{
var findByName = Enumeration.FindByName <Suit>(item.Suit);
return(findByName.Id);
}).ToArray();
int maxCardIndex = hand.Length - 1;
return(hand[0].Suit.Equals(hand[maxCardIndex].Suit));
}
public static bool IsStraight(Card[] hand)
{
// Sort hand by rank.
hand = hand.OrderBy(item => Enumeration.FindByName <Rank>(item.Rank).Id).ToArray();
// Increments the rank of the current position by 1, beginning the sequence.
int sequentialRank = Enumeration.FindByName <Rank>(hand[0].Rank).Id + 1;
// If the next card does not match the sequence, the loop breaks. Otherwise, it succeeds.
for (int i = 1; i < hand.Length; i++)
{
if (hand[i].Rank != Enumeration.FindById <Rank>(sequentialRank++).Name)
{
return(false);
}
}
return(true);
}
// <summary>
/// Checks for a one pair hand.
/// </summary>
/// <remarks>A one pair hand has two cards of the same rank.</remarks>
/// <param name="hand">The player's hand.</param>
/// <returns>Returns true if the hand is a one pair; returns false otherwise.</returns>
public static bool IsOnePair(Card[] hand)
{
// Check whether the hand is not a one pair but better.
if (IsThreeOfAKind(hand))
{
return(false);
}
// Sort hand by rank.
hand = hand.OrderBy(item => Enumeration.FindByName <Rank>(item.Rank).Id).ToArray();
// Check for two cards of the same rank in the lower position.
// a a b c d
bool lowPair = hand[0].Rank == hand[1].Rank;
// Check for two cards of the same rank in the lower middle position.
// a b b c d
bool lowerMiddlePair = hand[1].Rank == hand[2].Rank;
return(lowPair || lowerMiddlePair);
}
public static bool IsThreeOfAKind(Card[] hand)
{
// Sort hand by rank.
hand = hand.OrderBy(item => Enumeration.FindByName <Rank>(item.Rank).Id).ToArray();
// Check for 3 cards of the same rank and two high unmatched cards.
// a a a b c
bool lowThreeOfAKind = hand[0].Rank == hand[1].Rank &&
hand[1].Rank == hand[2].Rank;
//// Check for 3 cards of the same rank, one low unmatched card and one high unmatched card.
//// a b b b c
//bool middleThreeOfAKind = (int)hand[1].Rank == (int)hand[2].Rank &&
// (int)hand[2].Rank == (int)hand[3].Rank;
//// Check for 3 cards of the same rank and two low unmatched cards
//// a b c c c
//bool highThreeOfAKind = (int)hand[2].Rank == (int)hand[3].Rank &&
// (int)hand[3].Rank == (int)hand[4].Rank;
return(lowThreeOfAKind);
}