/*
 * timemeasurement.cpp
 *
 *  Created on: Nov 25, 2011
 *      Author: muecklgr_local
 */

#include <iostream>

#include "GLTB/timemeasurement.h"

namespace gltb {
	void TimeMeasurement::setMaxNumMeasurements(unsigned int maxNumMeasurements)
	{
		this->maxNumMeasurements = maxNumMeasurements;

		if(maxNumMeasurements > 0 && measurements.size() > maxNumMeasurements) {
			while(measurements.size() > maxNumMeasurements) {
				measurements.erase(measurements.begin());
			}
		}
	}

	void TimeMeasurement::reset()
	{
		measurements.clear();
		startOffset = 0;
	}

	void TimeMeasurement::start(bool continueMeasurement)
	{
		if(continueMeasurement && !measurements.empty()) {
			startOffset = measurements[measurements.size() - 1];
			measurements.pop_back();
		} else {
			startOffset = 0;
		}

		timer.start();
	}

	void TimeMeasurement::stop()
	{
		double time = timer.stopHighRes();

		addMeasurement(startOffset + time);
		startOffset = 0;
	}

	void TimeMeasurement::addMeasurement(double time)
	{
		measurements.push_back(time);

		if(maxNumMeasurements > 0 && measurements.size() > maxNumMeasurements) {
			while(measurements.size() > maxNumMeasurements) {
				measurements.erase(measurements.begin());
			}
		}
	}

	double TimeMeasurement::getAverageTime(int numMeasurements)
	{
		double averageTime = 0;

		if(numMeasurements == -1) {
			numMeasurements = measurements.size();
		}

		//std::cout << "numMeasurements=" << numMeasurements << std::endl;

		for(unsigned int i = measurements.size() - numMeasurements; i < measurements.size(); i++) {
			//std::cout << i << std::endl;
			averageTime += measurements[i];
		}
		//std::cout << "averageTime=" << averageTime << std::endl;
		averageTime /= numMeasurements;

		return averageTime;
	}
}