FixedSampleMCTSBot.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 java.rmi.RemoteException;

import bots.mctsbot.ai.bots.bot.AbstractBot;
import bots.mctsbot.ai.bots.bot.gametree.action.IllegalActionException;
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 FixedSampleMCTSBot extends AbstractBot {

	private final Config config;
	private final MCTSListener.Factory[] MCTSlistenerFactories;
	private final int samplesPreFlop;
	private final int samplesFlop;
	private final int samplesTurn;
	private final int samplesRiver;

	public FixedSampleMCTSBot(PlayerId botId, GameStateContainer gameState, RemoteHoldemPlayerContext playerContext, Config config, int samplesPreFlop,
			int samplesFlop, int samplesTurn, int samplesRiver, MCTSListener.Factory[] MCTSlisteners) {
		super(botId, gameState, playerContext);
		this.config = config;
		this.MCTSlistenerFactories = MCTSlisteners;
		this.samplesPreFlop = samplesPreFlop;
		this.samplesFlop = samplesFlop;
		this.samplesTurn = samplesTurn;
		this.samplesRiver = samplesRiver;
	}

	@Override
	public void doNextAction() {
		GameState gameState = gameStateContainer.getGameState();
		RootNode root = new RootNode(gameState, botId, config);
		switch (gameState.getRound()) {
		case PREFLOP:
			nbSamples = samplesPreFlop;
			break;
		case FLOP:
			nbSamples = samplesFlop;
			break;
		case TURN:
			nbSamples = samplesTurn;
			break;
		case FINAL:
			nbSamples = samplesRiver;
			break;
		default:
			throw new IllegalStateException(gameState.getRound().toString());
		}
		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 (root.getNbSamples() < nbSamples);
		//		if (printed && gameState.getRound() == r)
		//			printed = false;
		//		if (logger.isDebugEnabled()) {
		//			logger.debug("Stopped MCTS.");
		//		}
		try {
			root.selectChild(config.getMoveSelectionStrategy()).getLastAction().getAction().perform(playerContext);
		} catch (RemoteException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalActionException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		MCTSListener[] listeners = createListeners(gameState, botId);
		for (MCTSListener listener : listeners) {
			listener.onMCTS(root);
		}
	}

	long nbSamples;

	private void iterate(RootNode root) {
		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++) {
			listeners[i] = MCTSlistenerFactories[i].create(gameState, actor);
		}
		return listeners;
	}

}