#include "common.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

unsigned get_cpu_count(void)
{
    return (unsigned)sysconf(_SC_NPROCESSORS_ONLN);
}

struct timespec get_time(void)
{
    struct timespec start_time;
    clock_gettime(CLOCK_MONOTONIC, &start_time);
    return start_time;
}

struct timespec time_diff(struct timespec* ts1, struct timespec* ts2)
{
  static struct timespec ts;
  ts.tv_sec = ts1->tv_sec - ts2->tv_sec;
  ts.tv_nsec = ts1->tv_nsec - ts2->tv_nsec;
  if (ts.tv_nsec < 0) {
    ts.tv_sec--;
    ts.tv_nsec += 1000000000;
  }
  return ts;
}

struct timespec get_duration(struct timespec* ts)
{
  struct timespec time = get_time();
  return time_diff(&time, ts);
}

void print_time(struct timespec* ts)
{
  long ns = ts->tv_nsec % 1000;
  long us = (ts->tv_nsec / 1000) % 1000;
  long ms = (ts->tv_nsec / 1000000) % 1000;
  long s =  (ts->tv_nsec / 1000000000) % 1000 + ts->tv_sec;
  long t = (s * 1000000000) + (ms * 1000000) + (us * 1000) + ns;
  printf("%3lds %3ldms %3ldus %3ldns %12ld", s, ms, us, ns, t);
}

int* read_int_array(unsigned n)
{
  int* array = (int*)malloc(n * sizeof(unsigned));
  for (unsigned i = 0; i < n; ++i) {
    if (scanf("%i", &array[i]) == EOF) {
      return 0;
    }
  }
  return array;
}

void read_input(int** array, unsigned* n)
{
  if (isatty(0)) {
    printf("Enter n: ");
  }
  if (scanf("%u", n) == EOF) {
    *array = 0;
    *n = 0;
    return;
  }
  if (isatty(0)) {
    printf("Enter %u integers: ", 2 * *n);
  }
  *array = read_int_array(2 * *n);
  if (!*array) {
    *n = 0;
  }
}

void print_array(int* array, unsigned n)
{
  for (unsigned i = 0; i < n; ++i) {
    printf("%i%s", array[i], i == n - 1 ? "" : " ");
  }
  printf("\n");
}