/*!
 ******************************************************************************
 *
 * \file
 *
 * \brief   RAJA header file for simple class that can be used to
 *          time code sections.
 *
 * \author  Rich Hornung, Center for Applied Scientific Computing, LLNL
 * \author  Jeff Keasler, Applications, Simulations And Quality, LLNL
 *
 ******************************************************************************
 */

#ifndef RAJA_Timer_HXX
#define RAJA_Timer_HXX

#if defined(RAJA_USE_CYCLE)
#    include "./cycle.h"
typedef ticks TimeType;

#elif defined(RAJA_USE_CLOCK)
#    include <time.h>
typedef clock_t TimeType;

#elif defined(RAJA_USE_GETTIME)
#    include <time.h>
typedef timespec TimeType;

#else
#    error RAJA_TIMER_TYPE is undefined!

#endif

namespace RAJA
{
/*!
 ******************************************************************************
 *
 * \brief  Simple timer class to time code sections.
 *
 ******************************************************************************
 */
class Timer
{
public:
#if defined(RAJA_USE_CYCLE) || defined(RAJA_USE_CLOCK)
    Timer()
    : telapsed(0)
    {
        ;
    }
#endif
#if defined(RAJA_USE_GETTIME)
    Timer()
    : telapsed(0)
    , stime_elapsed(0)
    , nstime_elapsed(0)
    {
        ;
    }
#endif

#if defined(RAJA_USE_CYCLE)
    void start() { tstart = getticks(); }
    void stop()
    {
        tstop = getticks();
        set_elapsed();
    }

    long double elapsed() { return static_cast<long double>(telapsed); }
#endif

#if defined(RAJA_USE_CLOCK)
    void start() { tstart = clock(); }
    void stop()
    {
        tstop = clock();
        set_elapsed();
    }

    long double elapsed() { return static_cast<long double>(telapsed) / CLOCKS_PER_SEC; }
#endif

#if defined(RAJA_USE_GETTIME)

#    if 0
   void start() { clock_gettime(CLOCK_REALTIME, &tstart); }
   void stop()  { clock_gettime(CLOCK_REALTIME, &tstop); set_elapsed(); }
#    else
    void start() { clock_gettime(CLOCK_MONOTONIC, &tstart); }
    void stop()
    {
        clock_gettime(CLOCK_MONOTONIC, &tstop);
        set_elapsed();
    }
#    endif

    long double elapsed() { return (stime_elapsed + nstime_elapsed); }

#endif

private:
    TimeType    tstart;
    TimeType    tstop;
    long double telapsed;

#if defined(RAJA_USE_CYCLE) || defined(RAJA_USE_CLOCK)
    void set_elapsed() { telapsed += (tstop - tstart); }

#elif defined(RAJA_USE_GETTIME)
    long double stime_elapsed;
    long double nstime_elapsed;

    void set_elapsed()
    {
        stime_elapsed += static_cast<long double>(tstop.tv_sec - tstart.tv_sec);
        nstime_elapsed +=
            static_cast<long double>(tstop.tv_nsec - tstart.tv_nsec) / 1000000000.0;
    }
#endif
};

}  // namespace RAJA

#endif  // closing endif for header file include guard