#define _POSIX_C_SOURCE 199309L
#include "timer.h"

#include <stdio.h>
#include <time.h>

/*#if __APPLE__
#include <sys/time.h>
static struct timespec start = {0, 0};

// Starts the timer.
void startTimer()
{
    clock_gettime(CLOCK_MONOTONIC, &start);
}

// Returns the time in seconds since startTimer() was called.
double stopTimer()
{
    struct timespec end;
    
    clock_gettime(CLOCK_MONOTONIC, &end);

    unsigned long long delta_us = (end.tv_sec - start.tv_sec) * 1000000 + (end.tv_nsec - start.tv_nsec) / 1000;

    double measuredSeconds = (double)delta_us / 1000000.;

    if(start.tv_nsec > 0) {
        start.tv_nsec = 0;
        start.tv_sec = 0;
    }
    else
        measuredSeconds = -1;

    return measuredSeconds;
}
#else
#include <time.h>
static clock_t startClocks = 0;

// Starts the timer.
void startTimer()
{
    startClocks = clock();

    printf("\nstartclocks: %ld\n", startClocks);
}

// Returns the time in seconds since startTimer() was called.
double stopTimer()
{
    clock_t endClocks = clock();

    printf("\nendclocks: %ld\n", endClocks);
    printf("\ndeltatimer: %ld\n", (endClocks - startClocks));

    printf("CLOCKS_PER_SECONDS: %ld\n", CLOCKS_PER_SEC);
    double measuredSeconds = (double)(endClocks - startClocks) / CLOCKS_PER_SEC;
    if(startClocks > 0)
        startClocks = 0;
    else
        measuredSeconds = -1;

    printf("measuredsecondes: %f\n", measuredSeconds);

    return measuredSeconds;
}



#endif*/

static struct timespec start;

void startTimer() {

    clock_gettime(CLOCK_MONOTONIC, &start);
}

static struct timespec end;
double stopTimer() {

    clock_gettime(CLOCK_MONOTONIC, &end);

    double measuredseconds = (double)(end.tv_sec - start.tv_sec) + (double)(end.tv_nsec - start.tv_nsec) * 0.000000001;
    if (start.tv_sec>0 || start.tv_nsec>0){
        end.tv_nsec = 0;
        end.tv_sec  =0;
        start.tv_sec  = 0;
        start.tv_nsec = 0;
    }else {
        measuredseconds = -1;
    }

    return measuredseconds;
}