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

/*gamma covariance function*/
double gammf(double h, double alpha, int cores) {
    double* used_ram_t0 = malloc(sizeof(double));
    getVirtualMemUsed(used_ram_t0);

    clock_t t = clock();

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

    struct cpustat initial[cores];
    struct cpustat final[cores];

    for (int i = 0; i < cores; i++) {
        get_stats(&initial[i], i - 1);
    }

    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

    for (int i = 0; i < cores; i++) {
        get_stats(&final[i], i - 1);
    }

    for (int i = 0; i < cores; i++) {
        log_info("CPU %d: %lf%%", i, calculate_load(&initial[i], &final[i]));
    }

    double* used_ram_tf = malloc(sizeof(double));
    getVirtualMemUsed(used_ram_t0);

    log_info("RESULT = success, delta = %f, z = %f, ELAPSED = %f seconds, DIF USED VIRTUAL MEM = %5.1f MB", delta, z, time_taken, *used_ram_tf - *used_ram_t0);

    free(used_ram_t0);
    free(used_ram_tf);

    return z;
}