/**
 * Copyright (C) 2010-2017 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite 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
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
 */
/**
 * 
 */
package org.evosuite.ga.stoppingconditions;

import org.evosuite.Properties;
import org.evosuite.ga.metaheuristics.GeneticAlgorithm;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * <p>
 * GlobalTimeStoppingCondition class.
 * </p>
 * 
 * @author Gordon Fraser
 */
public class GlobalTimeStoppingCondition extends StoppingConditionImpl {

	private static final Logger logger = LoggerFactory.getLogger(GlobalTimeStoppingCondition.class);

	private static final long serialVersionUID = -4880914182984895075L;

	/** Assume the search has not started until start_time != 0 */
	protected static long startTime = 0L;

	/** Constant <code>pause_time=0L</code> */
	protected static long pauseTime = 0L;

	/** {@inheritDoc} */
	@Override
	public void searchStarted(GeneticAlgorithm<?> algorithm) {
		if (startTime == 0)
			reset();
	}

	/* (non-Javadoc)
	 * @see org.evosuite.ga.StoppingCondition#getCurrentValue()
	 */
	/** {@inheritDoc} */
	@Override
	public long getCurrentValue() {
		long current_time = System.currentTimeMillis();
		return (int) ((current_time - startTime) / 1000);
	}

	/* (non-Javadoc)
	 * @see org.evosuite.ga.StoppingCondition#isFinished()
	 */
	/** {@inheritDoc} */
	@Override
	public boolean isFinished() {
		long current_time = System.currentTimeMillis();
		if (Properties.GLOBAL_TIMEOUT != 0 && startTime != 0
		        && (current_time - startTime) / 1000 > Properties.GLOBAL_TIMEOUT)
			logger.info("Timeout reached");

		return Properties.GLOBAL_TIMEOUT != 0 && startTime != 0
		        && (current_time - startTime) / 1000 > Properties.GLOBAL_TIMEOUT;
	}

	/* (non-Javadoc)
	 * @see org.evosuite.ga.StoppingCondition#reset()
	 */
	/** {@inheritDoc} */
	@Override
	public void reset() {
		if (startTime == 0)
			startTime = System.currentTimeMillis();
	}

	/**
	 * Fully resets the stopping condition. The start time is set to the current
	 * time and thus "no time has elapsed so far". If you want a conditional
	 * reset which only has an effect if the start time has never been changed
	 * use <tt>reset()</tt>.
	 */
	public void fullReset() {
		startTime = System.currentTimeMillis();
	}

	/* (non-Javadoc)
	 * @see org.evosuite.ga.StoppingCondition#setLimit(int)
	 */
	/** {@inheritDoc} */
	@Override
	public void setLimit(long limit) {
		// TODO Auto-generated method stub

	}

	/** {@inheritDoc} */
	@Override
	public long getLimit() {
		// TODO Auto-generated method stub
		return Properties.GLOBAL_TIMEOUT;
	}

	/**
	 * <p>
	 * forceReset
	 * </p>
	 */
	public static void forceReset() {
		startTime = 0;
	}

	/** {@inheritDoc} */
	@Override
	public void forceCurrentValue(long value) {
		startTime = value;
	}

	/**
	 * Remember start pause time
	 */
	public void pause() {
		pauseTime = System.currentTimeMillis();
	}

	/**
	 * Change start time after MA
	 */
	public void resume() {
		startTime += System.currentTimeMillis() - pauseTime;
	}

}