/// <summary>
/// Checks if the hand has finished on a closed wait.
/// </summary>
/// <returns><c>True</c> if contains a closed wait; <c>False</c> otherwise.</returns>
public bool HandWithClosedWait()
{
if (YakusCombinations == null)
{
return(false);
}
// The combination with the last pick.
TileComboPivot combo = YakusCombinations.FirstOrDefault(c => c.Tiles.Any(t => ReferenceEquals(t, LatestPick)));
if (combo == null || combo.IsBrelanOrSquare)
{
return(false);
}
// Other concealed (and not declared) combinations with the same tile.
List <TileComboPivot> otherCombos =
YakusCombinations
.Where(c => c != combo && !DeclaredCombinations.Contains(c) && c.Tiles.Contains(LatestPick))
.ToList();
// The real "LatestPick" is closed...
bool isClosed = combo.IsPair || LatestPick.TileIsMiddleWait(combo) || LatestPick.TileIsEdgeWait(combo);
// .. but there might be not-closed alternatives with the same tile as "LatestPick" in other combination.
bool alternative1 = otherCombos.Any(c => c.IsBrelanOrSquare);
bool alternative2 = otherCombos.Any(c => c.IsSequence && !LatestPick.TileIsMiddleWait(c) && !LatestPick.TileIsEdgeWait(c));
return(isClosed && !(alternative1 || alternative2));
}
/// <summary>
/// Declares a kan (opened). Does not discard a tile. Does not draw substitution tile.
/// </summary>
/// <param name="tile">The stolen tile.</param>
/// <param name="stolenFrom">The wind which the tile has been stolen from.</param>
/// <param name="fromOpenPon">The <see cref="TileComboPivot"/>, if the kan is called as an override of a previous pon call; <c>Null</c> otherwise.</param>
/// <exception cref="ArgumentNullException"><paramref name="tile"/> is <c>Null</c>.</exception>
/// <exception cref="InvalidOperationException"><see cref="Messages.InvalidCall"/></exception>
internal void DeclareKan(TilePivot tile, WindPivot?stolenFrom, TileComboPivot fromOpenPon)
{
if (tile == null)
{
throw new ArgumentNullException(nameof(tile));
}
if (fromOpenPon == null)
{
CheckTilesForCallAndExtractCombo(_concealedTiles.Where(t => t == tile),
stolenFrom.HasValue ? 3 : 4,
stolenFrom.HasValue ? tile : null,
stolenFrom
);
}
else
{
int indexOfPon = _declaredCombinations.IndexOf(fromOpenPon);
if (indexOfPon < 0 || stolenFrom.HasValue)
{
throw new InvalidOperationException(Messages.InvalidCall);
}
var concealedTiles = new List <TilePivot>
{
tile
};
concealedTiles.AddRange(fromOpenPon.Tiles.Where(t => !ReferenceEquals(t, fromOpenPon.OpenTile)));
_declaredCombinations[indexOfPon] = new TileComboPivot(concealedTiles, fromOpenPon.OpenTile, fromOpenPon.StolenFrom);
_concealedTiles.Remove(tile);
}
}
/// <summary>
/// Checks if the tile is on the closed edge of a sequence combination.
/// </summary>
/// <param name="combo">The combination.</param>
/// <returns><c>True</c> if on the closed edge; <c>False</c> otherwise.</returns>
public bool TileIsEdgeWait(TileComboPivot combo)
{
return(combo != null && combo.IsSequence && combo.Tiles.Contains(this) &&
(
(combo.SequenceFirstNumber == 1 && combo.SequenceLastNumber == Number) ||
(combo.SequenceLastNumber == 9 && combo.SequenceFirstNumber == Number)
));
}
/// <summary>
/// Checks if a tile can be discarded, but does not discard it.
/// </summary>
/// <param name="tile">The tile to discard; should obviously be contained in <see cref="_concealedTiles"/>.</param>
/// <param name="afterStealing">Optionnal; indicates if the discard is made after stealing a tile; the default value is <c>False</c>.</param>
/// <returns><c>False</c> if the discard is forbidden by the tile stolen; <c>True</c> otherwise.</returns>
/// <exception cref="ArgumentNullException"><paramref name="tile"/> is <c>Null</c>.</exception>
/// <exception cref="InvalidOperationException"><see cref="Messages.ImpossibleDiscard"/></exception>
/// <exception cref="ArgumentException"><see cref="Messages.ImpossibleStealingArgument"/></exception>
internal bool CanDiscardTile(TilePivot tile, bool afterStealing = false)
{
if (tile == null)
{
throw new ArgumentNullException(nameof(tile));
}
if (!_concealedTiles.Contains(tile))
{
throw new InvalidOperationException(Messages.ImpossibleDiscard);
}
if (afterStealing)
{
TileComboPivot lastCombination = _declaredCombinations.LastOrDefault();
if (lastCombination == null || lastCombination.IsConcealed)
{
throw new ArgumentException(Messages.ImpossibleStealingArgument, nameof(afterStealing));
}
TilePivot stolenTile = lastCombination.OpenTile;
if (stolenTile == tile)
{
return(false);
}
else if (lastCombination.IsSequence &&
tile.Family == lastCombination.Family &&
lastCombination.OpenTile.Number == lastCombination.SequenceFirstNumber &&
tile.Number == lastCombination.SequenceFirstNumber + 3)
{
return(false);
}
else if (lastCombination.IsSequence &&
tile.Family == lastCombination.Family &&
lastCombination.OpenTile.Number == lastCombination.SequenceLastNumber &&
tile.Number == lastCombination.SequenceLastNumber - 3)
{
return(false);
}
}
return(true);
}
/// <summary>
/// Checks if the tile is in the middle of a sequence combination.
/// </summary>
/// <param name="combo">The combination.</param>
/// <returns><c>True</c> if in the middle; <c>False</c> otherwise.</returns>
public bool TileIsMiddleWait(TileComboPivot combo)
{
return(combo != null && combo.IsSequence && combo.Tiles.Contains(this) &&
combo.SequenceFirstNumber != Number &&
combo.SequenceLastNumber != Number);
}