package edu.neu.ccs.evergreen.state;

import java.util.Random;

import org.apache.log4j.Logger;

import edu.neu.ccs.evergreen.model.Assignments;
import edu.neu.ccs.evergreen.model.State;

/**
 * Use a fair coin to decide if the next variable is true or false.
 */
public class FairNextState extends BiasNextState {
	private static final Logger LOGGER = Logger.getLogger(FairNextState.class);

	/**
	 * Create a new coin flipper with an optional seed.
	 * @param args Arguments
	 */
	public FairNextState(String args[])
	{
		long seed = 1;
		if (args.length > 0)
		{
			seed = Long.parseLong(args[0], 10);
		}
		random = new Random(seed);
		LOGGER.info("Using random seed of " + seed);
	}

	@Override
	protected double calculateBias(State state, int maxOriginalVariable, Assignments bestAssignments) {
		return 0.5;
	}

	@Override
	protected boolean doRefresh() {
		return doRefresh;
	}
}