1 files changed, 28 insertions, 0 deletions
diff --git a/server/player.cpp b/server/player.cpp
index 4407095..37dc3bc 100644
--- a/server/player.cpp
+++ b/server/player.cpp
@@ -36,6 +36,9 @@ Actions Game::Player::get_actions_draw() {
 	
 	if(!riichi) {
 		// Check if player can riichi.
+		if(can_riichi()) {
+			possible_actions.push_back(Action(Action::Riichi));
+		}
 		
 		// List all tiles that can be discarded.
 		for(std::size_t i = 0; i < hand.size(); i++) {
@@ -89,6 +92,31 @@ Actions Game::Player::get_actions_discard(Tile tile, PlayerNum discarder) {
 	return possible_actions;
 }
 
+bool Game::Player::can_riichi() {
+	if(open) {
+		return false;
+	}
+	
+	Tiles tiles = hand;
+	
+	// Take first tile out of the set.
+	Tile out = tiles.front();
+	tiles.erase(tiles.begin());
+	
+	// Iterate over the rest of the set, exchanging the tile until a tenpai is found or all is tested.
+	for(Tiles::iterator it = tiles.begin(); it != tiles.end(); it++) {
+		if(Hand::tenpai(tiles)) {
+			return true;
+		}
+		
+		// TODO: Skip unnecessary tests if player got several equal tiles on hand.
+		
+		std::swap(*it, out);
+	}
+	
+	return false;
+}
+
 Game::Player::Targets Game::Player::can_chi(Tile tile) {
 	Targets targets;