/**
 * PLEASE DO NOT EDIT THIS FILE
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <errno.h>
#include <sys/time.h>
#include <time.h>

#include "pa06.h"

/**
 * The number of seconds difference between t1 and t2
 */
double timeDiff(struct timeval t1, struct timeval t2)
{
  double time_diff;
  double sec_offset = 0;
  double t1_sec = t1.tv_sec;
  double t2_sec = t2.tv_sec;
  double t1_usec = t1.tv_usec;
  double t2_usec = t2.tv_usec;
  if (t2_usec < t1_usec) {
    time_diff = 1e6 + t2_usec - t1_usec;
    sec_offset = -1;
  } else {
    time_diff = t2_usec - t1_usec;
  }

  time_diff = (t2_sec - t1_sec) + sec_offset + time_diff / 1e6;
  return time_diff; // in seconds
}

/**
 * Print usage
 */
void printUsage()
{
    printf("\n"
	   "   Usage: ./pa06 <number-to-test> <number-of-parallel-threads>\n"
	   "\n");
}

/**
 * Program entry point
 */
int main(int argc, char * * argv)
{
    if(argc != 3) {
    	printUsage();
    	return 0;
    }

    // What was the input number?
    uint128 n = alphaTou128(argv[1]);
    char * n_str = u128ToString(n);    

    // How many concurrent threads?
    errno = 0; // so we know if strtol fails
    int n_threads = strtol(argv[2], NULL, 10);

    // Was there an error in the input arguments?
    int error = FALSE;
    if(errno != 0 || n_threads <= 0) {
	fprintf(stderr, "2nd argument must be a valid integer >= 1, aborting.\n");
	error = TRUE;
    }
    if(n_str && strcmp(n_str, argv[1]) != 0) {
	fprintf(stderr, "1st argument must be a valid 128-bit integer: '%s' != '%s', aborting.\n", n_str, argv[1]);
	error = TRUE;
    }

    if(error) {
	free(n_str);
	exit(1);
    }
    free(n_str);
    
    struct timeval time1;
    struct timeval time2;
    gettimeofday(&time1, NULL);
    printf("Testing if '%s' is prime with %d threads: ", argv[1], n_threads);
    fflush(stdout);
    int is_prime = primalityTestParallel(n, n_threads);
    gettimeofday(&time2, NULL);
    if(is_prime) {
	printf("TRUE");
    } else {
	printf("FALSE");
    }
    printf(", %8.4fs\n", timeDiff(time1, time2));

    return EXIT_SUCCESS;
}