/*
This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.

In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

For more information, please refer to <http://unlicense.org/>
*/

#define _GNU_SOURCE
#define _POSIX_C_SOURCE 1999309L

#include "clock.h"

#ifdef _WIN32
#define WIN32_MEAN_AND_LEAN
#include <windows.h>
#else
#include <time.h>
#include <unistd.h>
#include <stdlib.h>
#endif

/*
 * Returns the current absolute time in microsecods
 * TODO: Specify since when the time is calculated
 */
uint64_t get_absolute_time_us(void)
{
    #ifdef _WIN32
    FILETIME filetime;
    GetSystemTimePreciseAsFileTime(&filetime);
    uint64_t time = (uint64_t) filetime.dwLowDateTime | ((uint64_t) filetime.dwHighDateTime << 32);
    time /= 10;
    return time;
    #else
    struct timespec buffer;
    if (clock_gettime(CLOCK_REALTIME, &buffer))
        abort();
    uint64_t time = buffer.tv_sec * 1000000 + buffer.tv_nsec / 1000;
    return time;
    #endif
}

/*
 * Returns the current time in nanoseconds since
 * an unspecified point in time.
 */
uint64_t get_relative_time_ns(void)
{
    #ifdef _WIN32
    {
        int64_t count;
        int64_t freq;
        int ok;
        
        ok = QueryPerformanceCounter((LARGE_INTEGER*) &count);
        if (!ok) abort();

        ok = QueryPerformanceFrequency((LARGE_INTEGER*) &freq);
        if (!ok) abort();

        uint64_t res = 1000000000 * (double) count / freq;
        return res;
    }
    #else
    {
        struct timespec time;

        if (clock_gettime(CLOCK_REALTIME, &time))
            abort();

        uint64_t res;

        uint64_t sec = time.tv_sec;
        if (sec > UINT64_MAX / 1000000000)
            abort();
        res = sec * 1000000000;
        
        uint64_t nsec = time.tv_nsec;
        if (res > UINT64_MAX - nsec)
            abort();
        res += nsec;

        return res;
    }
    #endif
}

void sleep_ms(float ms)
{
#ifdef _WIN32
	Sleep(ms);
#else
	usleep(ms*1000);
#endif
}