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#include "hand.h"
bool Hand::agari(const Tiles& tiles) {
return basic_format(tiles);
}
bool Hand::tenpai(const Tiles& tiles) {
return basic_format_tenpai(tiles);
}
bool Hand::basic_format(const Tiles& tiles, bool pair_eaten) {
if(!tiles) {
return true; // All tiles eaten.
}
Tiles rest;
if(!pair_eaten) {
rest = tiles;
if(eat_pair(rest) && basic_format(rest, true)) {
return true;
}
}
if(tiles.size() < 3) {
return false;
}
rest = tiles;
if(eat_pon(rest) && basic_format(rest, pair_eaten)) {
return true;
}
rest = tiles;
if(eat_chi(rest) && basic_format(rest, pair_eaten)) {
return true;
}
return false;
}
bool Hand::basic_format_tenpai(const Tiles& tiles, bool pair_eaten, bool wait_eaten) {
if(!tiles) {
return true;
}
Tiles rest;
if(!pair_eaten && !wait_eaten) {
rest = tiles;
if(eat_tanki(rest) && basic_format_tenpai(rest, true, true)) {
return true;
}
}
if(tiles.size() < 2) {
return false;
}
if(!pair_eaten) {
rest = tiles;
if(eat_pair(rest) && basic_format_tenpai(rest, true, wait_eaten)) {
return true;
}
}
if(!wait_eaten) {
rest = tiles;
if(eat_chi_wait(rest) && basic_format_tenpai(rest, pair_eaten, true)) {
return true;
}
}
if(tiles.size() < 3) {
return false;
}
rest = tiles;
if(eat_pon(rest) && basic_format_tenpai(rest, pair_eaten, wait_eaten)) {
return true;
}
rest = tiles;
if(eat_chi(rest) && basic_format_tenpai(rest, pair_eaten, wait_eaten)) {
return true;
}
return false;
}
bool Hand::eat_tanki(Tiles& tiles) {
tiles.erase(tiles.begin());
return true;
}
bool Hand::eat_chi_wait(Tiles& tiles) {
Tile::Set set = tiles.front().get_set();
int num = tiles.front().get_num();
if(set == Tile::Honor || num > 8) {
return false;
}
// Look for T+1.
Tiles::iterator it = std::find(tiles.begin(), tiles.end(), Tile(set, num + 1));
if(it != tiles.end()) {
tiles.erase(it);
tiles.erase(tiles.begin());
return true;
}
if(num > 7) {
return Tiles();
}
// Look for T+2.
it = std::find(tiles.begin(), tiles.end(), Tile(set, num + 2));
if(it != tiles.end()) {
tiles.erase(it);
tiles.erase(tiles.begin());
return true;
}
return false;
}
bool Hand::eat_pair(Tiles& tiles) {
if(tiles[0] == tiles[1]) {
tiles.erase(tiles.begin(), tiles.begin() + 2);
return true;
}
return false;
}
bool Hand::eat_pon(Tiles& tiles) {
if(tiles[0] == tiles[2]) {
tiles.erase(tiles.begin(), tiles.begin() + 3);
return true;
}
return false;
}
bool Hand::eat_chi(Tiles& tiles) {
Tile::Set set = tiles.front().get_set();
int num = tiles.front().get_num();
if(set == Tile::Honor || num > 7) {
// Can't be chi-ed.
return false;
}
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 true;
}
}
return false;
}
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