/// <summary>
/// Creates a new honours suit.
/// <param name="type">The type of simple suit to make. Only valid if the type is simple. Defaults to east wind otherwise.</param>
/// </summary>
public HonourSuit(SuitIdentifier type) : base()
{
if (((int)type & (int)SuitColor.HONOURS) > 0)
{
ID = type;
}
else
{
ID = SuitIdentifier.EAST_WIND;
}
return;
}
/// <summary>
/// Creates a new simple suit.
/// <param name="type">The type of simple suit to make. Only valid if the type is simple. Defaults to bamboo otherwise.</param>
/// </summary>
public SimpleSuit(SuitIdentifier type) : base()
{
if (((int)type & (int)SuitColor.SIMPLE) > 0)
{
ID = type;
}
else
{
ID = SuitIdentifier.BAMBOO;
}
return;
}
/// <summary>
/// Creates a new bonus suit.
/// <param name="type">The type of simple suit to make. Only valid if the type is simple. Defaults to flowers otherwise.</param>
/// </summary>
public BonusSuit(SuitIdentifier type) : base()
{
if (((int)type & (int)SuitColor.BONUS) > 0)
{
ID = type;
}
else
{
ID = SuitIdentifier.FLOWER;
}
return;
}
private static int ContainsSuit(List <MahjongMeld> melds, SuitIdentifier suit)
{
int ret = 0;
foreach (MahjongMeld meld in melds)
{
if (meld.Cards[0].Suit.ID == suit) // Melds can only be made of uniform suits, so this is fine
{
ret++;
}
}
return(ret);
}
/// <summary>
/// Takes a hand and a set of fixed melds and returns the highest scoring winning hand possible.
/// This algorithm does not clobber data.
/// </summary>
/// <param name="hand">The set of tiles free to make melds as desired.</param>
/// <param name="melds">The set of melds that cannot be changed.</param>
/// <param name="seat_wind">The player's seat wind.</param>
/// <param name="prevailing_wind">The round's prevailing wind.</param>
/// <param name="self_pick">If true, then the player won by drawing from the wall.</param>
/// <returns>The best mahjong that can be formed from the given tiles or null if no mahjong can be formed.</returns>
public static List <MahjongMeld> BestMahjong(Hand hand, List <MahjongMeld> melds, SuitIdentifier seat_wind, SuitIdentifier prevailing_wind, bool self_pick = false)
{
List <MahjongMeld> ret = null;
int max = -1;
// Note that if the list is empty, we default to returning null as desired
foreach (List <MahjongMeld> mahjong in GetAllMahjongs(hand, melds))
{
int fan = HandFan(mahjong, seat_wind, prevailing_wind, self_pick);
if (fan > max)
{
ret = mahjong;
max = fan;
}
}
return(ret);
}
/// <summary>
/// Counts the number of fan in the given hand. This only works on completed hands.
/// Returns -1 if the melds do not form a valid hand.
/// </summary>
/// <param name="melds">The melds of the hand.</param>
/// <param name="seat_wind">The player's seat wind.</param>
/// <param name="prevailing_wind">The round's prevailing wind.</param>
/// <param name="self_pick">If true, then the player won by drawing from the wall.</param>
/// <param name="last_catch">If true, then the player won by drawing the last tile from the wall.</param>
/// <param name="win_by_replacement">If true, then the player won by drawing a replacement tile from a kong or bonus tile.</param>
/// <param name="double_replacement">If true, then the player won on a replacement tile for a replacement tile.</param>
/// <param name="robbing_kong">If true, then the player won by robbing the kong.</param>
/// <param name="heavenly_hand">If true, then the player won on their starting hand (only applies to east).</param>
/// <param name="earthly_hand">If true, then the player won on east's discard.</param>
/// <returns>Returns the fan of the provided hand.</returns>
public static int HandFan(List <MahjongMeld> melds, SuitIdentifier seat_wind, SuitIdentifier prevailing_wind, bool self_pick = false, bool last_catch = false, bool win_by_replacement = false, bool double_replacement = false, bool robbing_kong = false, bool heavenly_hand = false, bool earthly_hand = false)
{
// If we don't have a hand, abandon ship
if (!IsMahjong(melds))
{
return(-1);
}
// We know we have a winning hand, so ensure we get the limit value
if (melds.Count == 1 || double_replacement || heavenly_hand || earthly_hand)
{
return(int.MaxValue);
}
// For convenience
MahjongMeld eye = null;
List <MahjongMeld> leye = new List <MahjongMeld>();
List <MahjongMeld> cpk_melds = new List <MahjongMeld>();
foreach (MahjongMeld meld in melds)
{
if (meld.Eye)
{
eye = meld.Clone(); // There is exactly one of these since we know we have a winning hand that isn't a special hand
}
else
{
cpk_melds.Add(meld); // Since we have a winning hand, everything but the eye is a chow, pung, or kong
}
}
leye.Add(eye);
// Check for limit hands first
int winds = ContainsSuit(cpk_melds, SuitIdentifier.EAST_WIND) + ContainsSuit(cpk_melds, SuitIdentifier.SOUTH_WIND) + ContainsSuit(cpk_melds, SuitIdentifier.WEST_WIND) + ContainsSuit(cpk_melds, SuitIdentifier.NORTH_WIND);
// Great winds
if (winds == 4)
{
return(int.MaxValue);
}
// Small winds
if (winds == 3 && ContainsSuit(leye, SuitIdentifier.EAST_WIND) + ContainsSuit(leye, SuitIdentifier.SOUTH_WIND) + ContainsSuit(leye, SuitIdentifier.WEST_WIND) + ContainsSuit(leye, SuitIdentifier.NORTH_WIND) == 1)
{
return(int.MaxValue);
}
// All kongs and self triplets
bool all_kongs = true;
bool self_pks = self_pick; // Self triplets must be won by self pick
foreach (MahjongMeld meld in cpk_melds)
{
if (!meld.Kong)
{
all_kongs = false;
}
if (!meld.Concealed || !(meld.Pung || meld.Kong))
{
self_pks = false;
}
}
if (all_kongs || self_pks)
{
return(int.MaxValue);
}
// All orphans
bool ophans = true;
foreach (MahjongMeld meld in cpk_melds) // Here we accept melds of ones and nines only
{
if (!meld.Pung && !meld.Kong || !ApproxEqual(meld.Cards[0].Value.MaxValue, 1.0) && !ApproxEqual(meld.Cards[0].Value.MaxValue, 9.0))
{
ophans = false;
}
}
if (ophans)
{
return(int.MaxValue);
}
// We have a boring hand, so calculate its points
int ret = 0;
// The below all have their points reduced so that the presence of the dragons/winds will bump up their point values as appropriate later
if (ContainsSuit(cpk_melds, SuitIdentifier.GREEN_DRAGON) + ContainsSuit(cpk_melds, SuitIdentifier.RED_DRAGON) + ContainsSuit(cpk_melds, SuitIdentifier.WHITE_DRAGON) == 3)
{
ret = 5; // Great dragon: 8 (5 + 3)
}
else if (ContainsSuit(cpk_melds, SuitIdentifier.GREEN_DRAGON) + ContainsSuit(cpk_melds, SuitIdentifier.RED_DRAGON) + ContainsSuit(cpk_melds, SuitIdentifier.WHITE_DRAGON) == 2 && ContainsSuit(leye, SuitIdentifier.GREEN_DRAGON) + ContainsSuit(leye, SuitIdentifier.RED_DRAGON) + ContainsSuit(leye, SuitIdentifier.WHITE_DRAGON) == 1)
{
ret = 3; // Small dragon: 5 (3 + 2)
}
else if (ContainsTileType(cpk_melds, SuitColor.HONOURS) + ContainsTileType(leye, SuitColor.HONOURS) == 5)
{
ret = 10 - ContainsSuit(cpk_melds, SuitIdentifier.GREEN_DRAGON) - ContainsSuit(cpk_melds, SuitIdentifier.RED_DRAGON) - ContainsSuit(cpk_melds, SuitIdentifier.WHITE_DRAGON); // All honours: 10 (10 - drags + drags)
}
else if (ContainsSuit(cpk_melds, SuitIdentifier.BAMBOO) + ContainsSuit(leye, SuitIdentifier.BAMBOO) == 5 || ContainsSuit(cpk_melds, SuitIdentifier.CHARACTER) + ContainsSuit(leye, SuitIdentifier.CHARACTER) == 5 || ContainsSuit(cpk_melds, SuitIdentifier.DOT) + ContainsSuit(leye, SuitIdentifier.DOT) == 5)
{
ret = 7; // All one suit: 7
}
else if (ContainsSuit(cpk_melds, SuitIdentifier.BAMBOO) + ContainsSuit(leye, SuitIdentifier.BAMBOO) + ContainsTileType(cpk_melds, SuitColor.HONOURS) + ContainsTileType(leye, SuitColor.HONOURS) == 5 ||
ContainsSuit(cpk_melds, SuitIdentifier.CHARACTER) + ContainsSuit(leye, SuitIdentifier.CHARACTER) + ContainsTileType(cpk_melds, SuitColor.HONOURS) + ContainsTileType(leye, SuitColor.HONOURS) == 5 ||
ContainsSuit(cpk_melds, SuitIdentifier.DOT) + ContainsSuit(leye, SuitIdentifier.DOT) + ContainsTileType(cpk_melds, SuitColor.HONOURS) + ContainsTileType(leye, SuitColor.HONOURS) == 5)
{
ret = 3; // Mixed one suit: 3
}
else
{
bool all_chow = true;
bool all_in_triplet = true;
foreach (MahjongMeld meld in cpk_melds)
{
if (meld.Chow)
{
all_in_triplet = false;
}
else
{
all_chow = false;
}
}
if (all_in_triplet)
{
ret = 3; // All in triplet
}
else if (all_chow)
{
ret = 1; // All chow
}
}
// The above are calculated so that we can add these special points without worrying over what type of hand we had for double counting
if (ContainsSuit(cpk_melds, seat_wind) > 0)
{
ret++;
}
if (ContainsSuit(cpk_melds, prevailing_wind) > 0)
{
ret++;
}
if (ContainsSuit(cpk_melds, SuitIdentifier.RED_DRAGON) > 0)
{
ret++;
}
if (ContainsSuit(cpk_melds, SuitIdentifier.GREEN_DRAGON) > 0)
{
ret++;
}
if (ContainsSuit(cpk_melds, SuitIdentifier.WHITE_DRAGON) > 0)
{
ret++;
}
// All oprhans is a limit hand, so the mixed orphans bonus is fine to put here like this
bool mixed_ophans = true;
foreach (MahjongMeld meld in cpk_melds) // Here we accept melds of honours, ones, and nines only
{
if (!meld.Pung && !meld.Kong || !ApproxEqual(meld.Cards[0].Value.MaxValue, 1.0) && !ApproxEqual(meld.Cards[0].Value.MaxValue, 9.0) && meld.Cards[0].Suit.Color != SuitColor.HONOURS)
{
mixed_ophans = false;
}
}
if (mixed_ophans)
{
ret++;
}
// Self pick is drawing the winning tile
if (self_pick)
{
ret++;
}
if (robbing_kong)
{
ret++;
}
if (last_catch)
{
ret++;
}
if (win_by_replacement)
{
ret++;
}
// Win from wall is if you never melded from a discard, that is all melds are concealed
bool all_concealed = true;
for (int i = 0; i < melds.Count; i++)
{
if (melds[i].Exposed)
{
all_concealed = false;
break;
}
}
if (all_concealed)
{
ret++;
}
return(ret);
}