/*
  Copyright 2011-2021 David Robillard <d@drobilla.net>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#ifdef _WIN32
#  include <process.h>
#else
#  include <unistd.h>
#endif

typedef struct {
  size_t   n_tests;
  uint32_t seed;
  bool     exhaustive;
  bool     error;
} ExessNumTestOptions;

static bool
print_num_test_usage(const char* const name)
{
  fprintf(stderr, "Usage: %s [OPTION]...\n", name);
  fprintf(stderr, "  -n NUM_TESTS Number of random tests to run.\n");
  fprintf(stderr, "  -s SEED      Use random seed.\n");
  fprintf(stderr, "  -x           Exhaustively test numbers.\n");
  return true;
}

static ExessNumTestOptions
parse_num_test_options(const int argc, char* const* const argv)
{
  ExessNumTestOptions opts = {
    16384u, (uint32_t)time(NULL) + (uint32_t)getpid(), false, false};

  int a = 1;
  for (; a < argc && argv[a][0] == '-'; ++a) {
    if (argv[a][1] == 'x') {
      opts.exhaustive = true;
    } else if (argv[a][1] == 's') {
      if (++a == argc) {
        opts.error = print_num_test_usage(argv[0]);
        break;
      }

      opts.seed = (uint32_t)strtol(argv[a], NULL, 10);
    } else if (argv[a][1] == 'n') {
      if (++a == argc) {
        opts.error = print_num_test_usage(argv[0]);
        break;
      }

      opts.n_tests = (uint32_t)strtol(argv[a], NULL, 10);
    } else {
      opts.error = print_num_test_usage(argv[0]);
      break;
    }
  }

  return opts;
}

static void
print_num_test_progress(const uint64_t i, const uint64_t n_tests)
{
  if (i % (n_tests / 20) == 1) {
    fprintf(stderr, "%f%%\n", (double)i / (double)n_tests * 100.0);
  }
}