#include "genlib.h"
#include "log.h"
#include <math.h>
#include <stdio.h>
#include <time.h>

/*gamma covariance function*/
double gammf(double h, double alpha) {
    clock_t t = clock();

    log_info("RESULT = in progress, h = %f, alpha = %f", h, alpha);

    float delta;
    double z;

    delta = pow(20., 1. / alpha) - 1.;
    z = 1. / (double)(pow(1. + h * delta, alpha));

    t = clock() - t;
    double time_taken = ((double)t)/CLOCKS_PER_SEC; // calculate the elapsed time

    double* total_ram = malloc(sizeof(double));
    getTotalVirtualMem(total_ram);

    double* used_ram = malloc(sizeof(double));
    getVirtualMemUsed(used_ram);

    log_info("TOTAL VIRTUAL MEM = %5.1f MB, USED VIRTUAL MEM = %5.1f MB, USED VIRTUAL MEM BY CURRENT PROCESS = %d MB", 
    *total_ram, *used_ram, getVirtualMemUsedByCurrentProcess());

    free(total_ram);
    free(used_ram);

    log_info("RESULT = success, delta = %f, z = %f, ELAPSED = %f seconds", delta, z, time_taken);
    return z;
}