#ifndef __CHRONO_H__
#define __CHRONO_H__

#include <ctime>

/**
 * \namespace	Chrono 
 *
 * \brief	A small set of utilities encapsulating timing functions 
**/
namespace Chrono 
{

/**
* \class	Stopwatch
*
* \brief	A stopwatch
*
* \details	Allows to create a stopwatch, start, stop and getting time in various formats.
**/
class Stopwatch
{
public:
 /**
 * \fn	Stopwatch::Stopwatch();
 *
 * \brief	Default constructor. 
 *
**/
inline
Stopwatch();

 /**
 * \fn	void Stopwatch::Start();
 *
 * \brief	Starts the time counter. 
 *
**/
inline
void Start();

  /**
 * \fn	void Stopwatch::Stop();
 *
 * \brief	Stops the time counter. 
 *
**/
inline
void Stop();

  /**
 * \fn	void Stopwatch::Reset();
 *
 * \brief	Resets the time counter to 0 sec.
 *
**/
inline
void Reset();

  /**
 * \fn	double  Stopwatch::GetTimeInMilliseconds();
 *
 * \brief	Gets the time in milliseconds. 
 *
 * \return	The time in milliseconds. 
 *
**/
inline
double  GetTimeInMilliseconds();

 /**
 * \fn	double Stopwatch::GetTimeInSeconds();
 *
 * \brief	Gets the time in seconds. 
 *
 * \return	The time in seconds. 
 *
**/
inline
double  GetTimeInSeconds();

  /**
 * \fn	double Stopwatch::GetTimeInMinutes();
 *
 * \brief	Gets the time in minutes. 
 *
 * \return	The time in minutes. 
 *
**/
inline
double  GetTimeInMinutes();

  /**
 * \fn	double Stopwatch::GetTimeInHours();
 *
 * \brief	Gets the time in hours. 
 *
 * \return	The time in hours. 
 *
**/
inline
double  GetTimeInHours();

  /**
 * \fn	void Stopwatch::GetTime(int &aHours, int &aMinutes, int &aSeconds, int &aMilliseconds);
 *
 * \brief	Gets a time in a formated way
 *
 * \param [in,out]	aHours			a in hours. 
 * \param [in,out]	aMinutes		a in minutes. 
 * \param [in,out]	aSeconds		a in seconds. 
 * \param [in,out]	aMilliseconds	a in milliseconds. 
 *
**/

inline
void    GetTime(int &aHours, int &aMinutes, int &aSeconds, int &aMilliseconds);

private :
  unsigned int mStart;
  unsigned int mAccumulator;
  bool mStopped;
  };
}

inline
Chrono::Stopwatch::Stopwatch() : mAccumulator(0), mStopped(true)
{
}

inline
void Chrono::Stopwatch::Start()
{
  if(!mStopped)
   return;

  mStart = clock() - mAccumulator;
 mStopped = false;
}

inline
void Chrono::Stopwatch::Stop()
{
  if(mStopped)
   return;

  mAccumulator = clock() - mStart;
  mStopped = true;
}

inline
void Chrono::Stopwatch::Reset()
{
  Stop();
  mAccumulator = 0;
}

inline
double Chrono::Stopwatch::GetTimeInMilliseconds()
{
  return GetTimeInSeconds() * 1000.0;
}

inline
double Chrono::Stopwatch::GetTimeInSeconds()
{
  unsigned int lTime;
  if(mStopped)
   lTime = mAccumulator;
  else
   lTime = clock() - mStart;

  return lTime / (double)CLOCKS_PER_SEC;
}

inline
double Chrono::Stopwatch::GetTimeInMinutes()
{
  return GetTimeInSeconds() / 60.0;
}

inline
double Chrono::Stopwatch::GetTimeInHours()
{
  return GetTimeInSeconds() / 3600.0;
}

inline
void Chrono::Stopwatch::GetTime(int &aHours, int &aMinutes, int &aSeconds, int &aMilliseconds)
{
  double lRemainder = GetTimeInSeconds();

  aHours = (int)(lRemainder / 3600.0);
  lRemainder -= aHours;

  aMinutes = (int)(lRemainder / 60.0);
  lRemainder -= aMinutes;

  aSeconds = (int)lRemainder;
  lRemainder -= aSeconds;

  aMilliseconds = (int)lRemainder;
}

#endif // __CHRONO_H__