/// <summary>
/// Checks if <see cref="Yakus"/> and <see cref="YakusCombinations"/> have to be cancelled because of the temporary furiten rule.
/// </summary>
/// <param name="currentRound">The current round</param>
/// <param name="playerIndex">The player index of the hand.</param>
/// <returns><c>True</c> if temporary furiten; <c>False</c> otherwise.</returns>
internal bool CancelYakusIfTemporaryFuriten(RoundPivot currentRound, int playerIndex)
{
if (currentRound == null)
{
return(false);
}
int i = 0;
while (currentRound.PlayerIndexHistory.Count < i &&
currentRound.PlayerIndexHistory.ElementAt(i) == playerIndex.RelativePlayerIndex(-(i + 1)) &&
playerIndex.RelativePlayerIndex(-(i + 1)) != playerIndex)
{
// The tile discarded by the latest player is the tile we ron !
if (i > 0)
{
TilePivot lastFromDiscard = currentRound.GetDiscard(currentRound.PlayerIndexHistory.ElementAt(i)).LastOrDefault();
if (lastFromDiscard != null && IsCompleteFull(new List <TilePivot>(ConcealedTiles)
{
lastFromDiscard
}, DeclaredCombinations.ToList()))
{
Yakus = null;
YakusCombinations = null;
return(true);
}
}
i++;
}
return(false);
}
/// <summary>
/// Checks if any CPU player can make a pon call, and computes its decision if any.
/// </summary>
/// <returns>The player index who makes the call; <c>-1</c> is none.</returns>
public int PonDecision()
{
int opponentPlayerId = _round.OpponentsCanCallPon();
if (opponentPlayerId > -1)
{
TilePivot tile = _round.GetDiscard(_round.PreviousPlayerIndex).Last();
// Call the pon if :
// - the hand is already open
// - it's valuable (see "HandCanBeOpened")
var opponentHand = _round.GetHand(opponentPlayerId);
if (!opponentHand.IsConcealed || HandCanBeOpened(opponentPlayerId, tile, opponentHand))
{
return(opponentPlayerId);
}
opponentPlayerId = -1;
}
return(opponentPlayerId);
}