MCTSBot.java

/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
package bots.mctsbot.ai.bots.bot.gametree.mcts;

import org.apache.log4j.Logger;

import bots.mctsbot.ai.bots.bot.AbstractBot;
import bots.mctsbot.ai.bots.bot.gametree.action.SearchBotAction;
import bots.mctsbot.ai.bots.bot.gametree.mcts.listeners.MCTSListener;
import bots.mctsbot.ai.bots.bot.gametree.mcts.nodes.Config;
import bots.mctsbot.ai.bots.bot.gametree.mcts.nodes.INode;
import bots.mctsbot.ai.bots.bot.gametree.mcts.nodes.RootNode;
import bots.mctsbot.client.common.GameStateContainer;
import bots.mctsbot.client.common.gamestate.GameState;
import bots.mctsbot.common.api.lobby.holdemtable.holdemplayer.context.RemoteHoldemPlayerContext;
import bots.mctsbot.common.elements.player.PlayerId;

public class MCTSBot extends AbstractBot {

	private final static Logger logger = Logger.getLogger(MCTSBot.class);
	private final Config config;
	private final MCTSListener.Factory[] MCTSlistenerFactories;
	private final int decisionTime;

	long startTime = System.currentTimeMillis();

	public MCTSBot(PlayerId botId, GameStateContainer gameStateContainer, RemoteHoldemPlayerContext playerContext, Config config, int decisionTime,
			MCTSListener.Factory[] MCTSlisteners) {
		super(botId, gameStateContainer, playerContext);
		this.config = config;
		this.MCTSlistenerFactories = MCTSlisteners;
		this.decisionTime = decisionTime;
	}

	@Override
	public void doNextAction() {
		startTime = System.currentTimeMillis();
		long endTime = System.currentTimeMillis() + decisionTime;
		RootNode root = new RootNode(gameStateContainer.getGameState(), botId, config);
		logger.info("Starting MCTS iterations.");
		do {
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
			iterate(root);
		} while (System.currentTimeMillis() < endTime);
		//		if (printed && tableContext.getGameState().getRound() == r)
		//			printed = false;
		SearchBotAction action = root.selectChild(config.getMoveSelectionStrategy()).getLastAction().getAction();
		if (logger.isInfoEnabled())
			logger.info("Stopped MCTS after " + root.getNbSamples() + " samples and choosing " + action);
		action.perform(playerContext);
		MCTSListener[] listeners = createListeners(gameStateContainer.getGameState(), botId);
		for (MCTSListener listener : listeners) {
			listener.onMCTS(root);
		}
		//      if (OpponentModelPool.getInstance().size() > 1) {
		//      TextTreeListener.Factory factory = new TextTreeListener.Factory();
		////    SWTTreeListener.Factory factory = new SWTTreeListener.Factory(Display.getDefault());
		//      MCTSListener listener = factory.create(gameState, botId);
		//      listener.onMCTS(root);
		//      System.out.println("Tree printed");
		//}

	}

	//	long currentCount = 0;
	//	private final static Round r = Round.FLOP;
	//	public static boolean printed = false;

	private void iterate(RootNode root) {
		//		long currentTime = (System.currentTimeMillis()-startTime);
		//		Round round = tableContext.getGameState().getRound();
		//		if (printed && currentCount<currentTime && round == r){
		//			if (currentTime-currentCount!=1) {
		//				for (long i = currentCount+1; i <= currentTime; i++)
		//					System.out.println(i + " - " + root.getEV() + " - " + root.getEVStdDev());
		//			} else {
		//				System.out.println(currentTime + " - " + root.getEV() + " - " + root.getEVStdDev());
		//			}
		//			currentCount = currentTime;
		//		}
		INode selectedLeaf = root.selectRecursively();
		selectedLeaf.expand();
		double value = selectedLeaf.simulate();
		selectedLeaf.backPropagate(value);
	}

	private MCTSListener[] createListeners(GameState gameState, PlayerId actor) {
		MCTSListener[] listeners = new MCTSListener[MCTSlistenerFactories.length];
		for (int i = 0; i < MCTSlistenerFactories.length; i++) {
			System.out.println((i + 1) + " listener");
			listeners[i] = MCTSlistenerFactories[i].create(gameState, actor);
		}
		return listeners;
	}

}