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#include "hand.h"
bool Hand::agari(const Tiles& tiles) {
return basic_format(tiles);
}
bool Hand::basic_format(const Tiles& tiles, bool pair_eaten) {
if(!tiles) {
return true; // All tiles eaten.
}
if(!pair_eaten) {
if(Tiles rest = eat_pair(tiles)) {
if(basic_format(rest, true)) {
return true;
}
}
}
if(tiles.size() < 3) {
return false;
}
if(Tiles rest = eat_pon(tiles)) {
if(basic_format(rest, pair_eaten)) {
return true;
}
}
if(Tiles rest = eat_chi(tiles)) {
return basic_format(rest, pair_eaten);
}
return false;
}
Tiles Hand::eat_pair(Tiles tiles) {
if(tiles[0] == tiles[1]) {
tiles.erase(tiles.begin(), tiles.begin() + 2);
return tiles;
}
return Tiles();
}
Tiles Hand::eat_pon(Tiles tiles) {
if(tiles[0] == tiles[2]) {
tiles.erase(tiles.begin(), tiles.begin() + 3);
return tiles;
}
return Tiles();
}
Tiles Hand::eat_chi(Tiles tiles) {
Tile::Set set = tiles[0].get_set();
int num = tiles[0].get_num();
if(set == Tile::Honor || num > 7) {
// Can't be chi-ed.
return Tiles();
}
Tiles::iterator it1 = std::find(tiles.begin(), tiles.end(), Tile(set, num + 1));
if(it1 != tiles.end()) {
Tiles::iterator it2 = std::find(tiles.begin(), tiles.end(), Tile(set, num + 2));
if(it2 != tiles.end()) {
// We can eat a chi of tiles.
tiles.erase(it2);
tiles.erase(it1);
tiles.erase(tiles.begin());
return tiles;
}
}
return Tiles();
}
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