/**
 * $Id$
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifndef __KX_TIME_LOGGER_H
#define __KX_TIME_LOGGER_H

#ifdef WIN32
#pragma warning (disable:4786) // suppress stl-MSVC debug info warning
#endif

#include <deque>

#ifdef WITH_CXX_GUARDEDALLOC
#include "MEM_guardedalloc.h"
#endif

/**
 * Stores and manages time measurements.
 */
class KX_TimeLogger {
public:
	/**
	 * Constructor.
	 * @param maxNumMesasurements Maximum number of measurements stored (>1).
	 */
	KX_TimeLogger(unsigned int maxNumMeasurements = 10);

	/**
	 * Destructor.
	 */
	virtual ~KX_TimeLogger(void);

	/**
	 * Changes the maximum number of measurements that can be stored.
	 */
	virtual void SetMaxNumMeasurements(unsigned int maxNumMeasurements);

	/**
	 * Changes the maximum number of measurements that can be stored.
	 */
	virtual unsigned int GetMaxNumMeasurements(void) const;

	/**
	 * Starts logging in current measurement.
	 * @param now	The current time.
	 */
	virtual void StartLog(double now);

	/**
	 * End logging in current measurement.
	 * @param now	The current time.
	 */
	virtual void EndLog(double now);

	/**
	 * Logs time in next measurement.
	 * @param now	The current time.
	 */
	virtual void NextMeasurement(double now);

	/**
	 * Returns average of all but the current measurement.
	 * @return The average of all but the current measurement.
	 */
	virtual double GetAverage(void) const;

protected:
	/** Storage for the measurements. */
	std::deque<double> m_measurements;

	/** Maximum number of measurements. */
	unsigned int m_maxNumMeasurements;

	/** Time at start of logging. */
	double m_logStart;

	/** State of logging. */
	bool m_logging;


#ifdef WITH_CXX_GUARDEDALLOC
public:
	void *operator new(size_t num_bytes) { return MEM_mallocN(num_bytes, "GE:KX_TimeLogger"); }
	void operator delete( void *mem ) { MEM_freeN(mem); }
#endif
};

#endif // __KX_TIME_LOGGER_H