/// <summary>
/// Computes the fu count.
/// </summary>
/// <param name="hand">The hand.</param>
/// <param name="isTsumo"><c>True</c> if the winning tile is concealed; <c>False</c> otherwise.</param>
/// <param name="dominantWind">The dominant wind;</param>
/// <param name="playerWind">The player wind.</param>
/// <exception cref="ArgumentNullException"><paramref name="hand"/> is <c>Null</c>.</exception>
public static int GetFuCount(HandPivot hand, bool isTsumo, WindPivot dominantWind, WindPivot playerWind)
{
if (hand == null)
{
throw new ArgumentNullException(nameof(hand));
}
if (hand.Yakus.Any(y => y == YakuPivot.Chiitoitsu))
{
return(CHIITOI_FU);
}
int fuCount =
hand.YakusCombinations.Count(c => c.IsSquare && c.HasTerminalOrHonor) * HONOR_KAN_FU
+ hand.YakusCombinations.Count(c => c.IsSquare && !c.HasTerminalOrHonor) * REGULAR_KAN_FU
+ hand.YakusCombinations.Count(c => c.IsBrelan && c.HasTerminalOrHonor) * HONOR_PON_FU
+ hand.YakusCombinations.Count(c => c.IsBrelan && !c.HasTerminalOrHonor) * REGULAR_PON_FU;
if (isTsumo && !hand.Yakus.Any(y => y == YakuPivot.Pinfu))
{
fuCount += TSUMO_FU;
}
if (HandPivot.HandWithValuablePair(hand.YakusCombinations, dominantWind, playerWind))
{
fuCount += VALUABLE_PAIR_FU;
}
if (hand.HandWithClosedWait())
{
fuCount += CLOSED_WAIT_FU;
}
if (fuCount == 0 && !hand.Yakus.Any(y => y == YakuPivot.Pinfu))
{
fuCount += OPEN_PINFU_FU;
}
int baseFu = (hand.IsConcealed && !isTsumo ? BASE_CONCEALED_RON_FU : BASE_FU) + fuCount;
return(Convert.ToInt32(Math.Ceiling(baseFu / (decimal)10) * 10));
}
/// <summary>
/// Computes the list of yakus available with this sequence of combinations.
/// If the list contains one or several yakumans, it can't contain any regular yakus.
/// Two <see cref="YakuPivot"/> are not computed :
/// <list type="bullet">
/// <item><see cref="KokushiMusou"/></item>
/// <item><see cref="NagashiMangan"/></item>
/// </list>
/// </summary>
/// <param name="combinationsSequence">Sequence of combinations.</param>
/// <param name="context">Context.</param>
/// <returns>List of yakus with this sequence of combinations.</returns>
/// <exception cref="ArgumentNullException"><paramref name="combinationsSequence"/> is <c>Null</c>.</exception>
/// <exception cref="ArgumentNullException"><paramref name="context"/> is <c>Null</c>.</exception>
/// <exception cref="NotImplementedException">The <see cref="YakuPivot"/> to check is not implemented.</exception>
public static List <YakuPivot> GetYakus(List <TileComboPivot> combinationsSequence, WinContextPivot context)
{
if (combinationsSequence == null)
{
throw new ArgumentNullException(nameof(combinationsSequence));
}
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
var yakus = new List <YakuPivot>();
foreach (YakuPivot yaku in Yakus.Where(y => y.IsYakuman))
{
bool addYaku = false;
if (yaku == Daisangen)
{
addYaku = combinationsSequence.Count(c => c.IsBrelanOrSquare && c.Family == FamilyPivot.Dragon) == 3;
}
else if (yaku == Suuankou)
{
addYaku = combinationsSequence.Count(c => c.IsBrelanOrSquare && c.IsConcealed && (!c.Tiles.Contains(context.LatestTile) || context.DrawType.IsSelfDraw())) == 4;
}
else if (yaku == Shousuushii)
{
addYaku = combinationsSequence.Count(c => c.IsBrelanOrSquare && c.Family == FamilyPivot.Wind) == 3 &&
combinationsSequence.Any(c => c.IsPair && c.Family == FamilyPivot.Wind);
}
else if (yaku == Daisuushii)
{
addYaku = combinationsSequence.Count(c => c.IsBrelanOrSquare && c.Family == FamilyPivot.Wind) == 4;
}
else if (yaku == Tsuuiisou)
{
addYaku = combinationsSequence.All(c => c.IsHonor);
}
else if (yaku == Ryuuiisou)
{
addYaku = combinationsSequence.All(c =>
(c.Family == FamilyPivot.Bamboo && c.Tiles.All(t => new[] { 2, 3, 4, 6, 8 }.Contains(t.Number))) ||
(c.Family == FamilyPivot.Dragon && c.Tiles.First().Dragon == DragonPivot.Green)
);
}
else if (yaku == Chinroutou)
{
addYaku = combinationsSequence.All(c => c.IsTerminal);
}
else if (yaku == ChuurenPoutou)
{
if (combinationsSequence.All(c => c.IsConcealed) &&
combinationsSequence.Select(c => c.Family).Distinct().Count() == 1)
{
string numberPattern = string.Join(string.Empty, combinationsSequence.SelectMany(c => c.Tiles).Select(t => t.Number).OrderBy(i => i));
addYaku = new[]
{
"11112345678999", "11122345678999", "11123345678999",
"11123445678999", "11123455678999", "11123456678999",
"11123456778999", "11123456788999", "11123456789999"
}.Contains(numberPattern);
}
}
else if (yaku == Suukantsu)
{
addYaku = combinationsSequence.Count(c => c.IsSquare) == 4;
}
else if (yaku == Tenhou)
{
addYaku = context.IsTenhou();
}
else if (yaku == Chiihou)
{
addYaku = context.IsChiihou();
}
else if (yaku == Renhou)
{
addYaku = context.IsRenhou();
}
else if (yaku == KokushiMusou)
{
// Do nothing here, but prevents the exception below.
}
else
{
throw new NotImplementedException();
}
if (addYaku)
{
yakus.Add(yaku);
}
}
// Remove yakumans with existant upgrade (it's an overkill as the only known case is "Shousuushii" vs. "Daisuushii").
yakus.RemoveAll(y => y.Upgrades.Any(yu => yakus.Contains(yu)));
// Only return yakumans if any.
if (yakus.Count >= 1)
{
return(yakus);
}
foreach (YakuPivot yaku in Yakus.Where(y => !y.IsYakuman))
{
bool addYaku = false;
int occurences = 1;
if (yaku == Chiniisou)
{
addYaku = combinationsSequence.Select(c => c.Family).Distinct().Count() == 1 &&
!combinationsSequence.Any(c => c.IsHonor);
}
else if (yaku == Haitei)
{
addYaku = context.IsRoundLastTile;
}
else if (yaku == RinshanKaihou)
{
addYaku = context.DrawType == DrawTypePivot.Compensation;
}
else if (yaku == Chankan)
{
addYaku = context.DrawType == DrawTypePivot.OpponentKanCallOpen;
}
else if (yaku == Tanyao)
{
addYaku = combinationsSequence.All(c => !c.HasTerminalOrHonor);
}
else if (yaku == Yakuhai)
{
occurences = combinationsSequence.Count(c =>
c.IsBrelanOrSquare && (
c.Family == FamilyPivot.Dragon || (
c.Family == FamilyPivot.Wind && (
c.Tiles.First().Wind == context.DominantWind || c.Tiles.First().Wind == context.PlayerWind
)
)
)
);
addYaku = occurences > 0;
}
else if (yaku == Riichi)
{
addYaku = context.IsRiichi;
}
else if (yaku == Ippatsu)
{
addYaku = context.IsIppatsu;
}
else if (yaku == MenzenTsumo)
{
addYaku = context.DrawType.IsSelfDraw() && combinationsSequence.All(c => c.IsConcealed);
}
else if (yaku == Honiisou)
{
addYaku = combinationsSequence.Where(c => !c.IsHonor).Select(c => c.Family).Distinct().Count() == 1;
}
else if (yaku == Pinfu)
{
addYaku = combinationsSequence.Count(c => c.IsSequence && c.IsConcealed) == 4 &&
!HandPivot.HandWithValuablePair(combinationsSequence, context.DominantWind, context.PlayerWind) &&
combinationsSequence.Any(c => c.IsSequence && c.Tiles.Contains(context.LatestTile) &&
!context.LatestTile.TileIsEdgeWait(c) && !context.LatestTile.TileIsMiddleWait(c));
}
else if (yaku == Iipeikou)
{
int sequencesCount = combinationsSequence.Count(c => c.IsSequence);
addYaku = combinationsSequence.All(c => c.IsConcealed) && sequencesCount >= 2 &&
combinationsSequence.Where(c => c.IsSequence).Distinct().Count() < sequencesCount;
}
else if (yaku == Shousangen)
{
addYaku = combinationsSequence.Count(c => c.IsBrelanOrSquare && c.Family == FamilyPivot.Dragon) == 2 &&
combinationsSequence.Any(c => c.IsPair && c.Family == FamilyPivot.Dragon);
}
else if (yaku == Honroutou)
{
addYaku = combinationsSequence.All(c => c.IsTerminal || c.IsHonor);
}
else if (yaku == Chiitoitsu)
{
addYaku = combinationsSequence.All(c => c.IsPair);
}
else if (yaku == Sankantsu)
{
addYaku = combinationsSequence.Count(c => c.IsSquare) == 3;
}
else if (yaku == SanshokuDoukou)
{
addYaku = combinationsSequence
.Where(c => c.IsBrelanOrSquare && !c.IsHonor)
.GroupBy(c => c.Tiles.First().Number)
.FirstOrDefault(b => b.Count() >= 3)?
.Select(b => b.Family)?
.Distinct()?
.Count() == 3;
}
else if (yaku == Sanankou)
{
addYaku = combinationsSequence.Count(c => c.IsBrelanOrSquare && c.IsConcealed && (!c.Tiles.Contains(context.LatestTile) || context.DrawType.IsSelfDraw())) == 3;
}
else if (yaku == Toitoi)
{
addYaku = combinationsSequence.Count(c => c.IsBrelanOrSquare) == 4;
}
else if (yaku == Ittsu)
{
List <TileComboPivot> ittsuFamilyCombos =
combinationsSequence
.Where(c => c.IsSequence)
.GroupBy(c => c.Family)
.FirstOrDefault(b => b.Count() >= 3)?
.ToList();
addYaku = ittsuFamilyCombos != null &&
ittsuFamilyCombos.Any(c => c.SequenceFirstNumber == 1) &&
ittsuFamilyCombos.Any(c => c.SequenceFirstNumber == 4) &&
ittsuFamilyCombos.Any(c => c.SequenceFirstNumber == 7);
}
else if (yaku == SanshokuDoujun)
{
addYaku = combinationsSequence
.Where(c => c.IsSequence)
.GroupBy(c => c.SequenceFirstNumber)
.FirstOrDefault(b => b.Count() >= 3)?
.Select(b => b.Family)?
.Distinct()?
.Count() == 3;
}
else if (yaku == Chanta)
{
addYaku = combinationsSequence.All(c => c.HasTerminalOrHonor);
}
else if (yaku == DaburuRiichi)
{
addYaku = context.IsRiichi && context.IsFirstTurnRiichi;
}
else if (yaku == Ryanpeikou)
{
addYaku = combinationsSequence.All(c => c.IsConcealed) &&
combinationsSequence.Count(c => c.IsSequence) == 4 &&
combinationsSequence.Where(c => c.IsSequence).Distinct().Count() <= 2;
}
else if (yaku == Junchan)
{
addYaku = combinationsSequence.All(c => c.HasTerminal);
}
else if (yaku == NagashiMangan)
{
// Do nothing here, but prevents the exception below.
}
else
{
throw new NotImplementedException();
}
if (addYaku)
{
for (int i = 0; i < occurences; i++)
{
yakus.Add(yaku);
}
}
}
// Remove yakus with existant upgrade.
// It works because Upgrades is not recursive.
yakus.RemoveAll(y => y.Upgrades.Any(yu => yakus.Contains(yu)));
// On a concealed chanka, only Kokushi is allowed.
if (context.DrawType == DrawTypePivot.OpponentKanCallConcealed && !yakus.Contains(KokushiMusou))
{
yakus.Clear();
}
return(yakus);
}