/*
 * Copyright (c) 2012 David Siñuela Pastor, siu.4coders@gmail.com
 * 
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#ifndef MINUNIT_MINUNIT_H
#define MINUNIT_MINUNIT_H

#ifdef __cplusplus
extern "C"
{
#endif

#if defined(_WIN32)
#include <Windows.h>
#if defined(_MSC_VER) && _MSC_VER < 1900
#define snprintf _snprintf
#define __func__ __FUNCTION__
#endif

#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))

/* Change POSIX C SOURCE version for pure c99 compilers */
#if !defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE < 200112L
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 200112L
#endif

#include <string.h>
#include <sys/resource.h>
#include <sys/time.h> /* gethrtime(), gettimeofday() */
#include <sys/times.h>
#include <time.h>   /* clock_gettime(), time() */
#include <unistd.h> /* POSIX flags */

#if defined(__MACH__) && defined(__APPLE__)
#include <mach/mach.h>
#include <mach/mach_time.h>
#endif

#else
#error "Unable to define timers for an unknown OS."
#endif

#include <math.h>
#include <stdio.h>

/*  Maximum length of last message */
#define MINUNIT_MESSAGE_LEN 1024
/*  Accuracy with which floats are compared */
#define MINUNIT_EPSILON 1E-12

  /*  Misc. counters */
  static int minunit_run = 0;
  static int minunit_assert = 0;
  static int minunit_fail = 0;
  static int minunit_status = 0;

  /*  Timers */
  static double minunit_real_timer = 0;
  static double minunit_proc_timer = 0;

  /*  Last message */
  static char minunit_last_message[MINUNIT_MESSAGE_LEN];

  /*  Test setup and teardown function pointers */
  static void (*minunit_setup)(void) = NULL;
  static void (*minunit_teardown)(void) = NULL;

/*  Definitions */
#define MU_TEST(method_name) static void method_name(void)
#define MU_TEST_SUITE(suite_name) static void suite_name(void)

#define MU__SAFE_BLOCK(block) \
  do                          \
  {                           \
    block                     \
  } while (0)

/*  Run test suite and unset setup and teardown functions */
#define MU_RUN_SUITE(suite_name) MU__SAFE_BLOCK( \
    suite_name();                                \
    minunit_setup = NULL;                        \
    minunit_teardown = NULL;)

/*  Configure setup and teardown functions */
#define MU_SUITE_CONFIGURE(setup_fun, teardown_fun) MU__SAFE_BLOCK( \
    minunit_setup = setup_fun;                                      \
    minunit_teardown = teardown_fun;)

#define STR(X) #X
#define ASSTR(X) STR(X)

/*  Test runner */
#define MU_RUN_TEST(test) MU__SAFE_BLOCK(                     \
    if (minunit_real_timer == 0 && minunit_proc_timer == 0) { \
      minunit_real_timer = mu_timer_real();                   \
      minunit_proc_timer = mu_timer_cpu();                    \
    } printf("\n-- START " ASSTR(test) " --\n");              \
    if (minunit_setup)(*minunit_setup)();                     \
    minunit_status = 0;                                       \
    test();                                                   \
    minunit_run++;                                            \
    if (minunit_status) {                                     \
      minunit_fail++;                                         \
      printf("[FAILED]");                                     \
      printf("\n%s\n", minunit_last_message);                 \
    } fflush(stdout);                                         \
    if (minunit_teardown)(*minunit_teardown)();               \
    printf("\n-- END " ASSTR(test) " --\n");)

/*  Report */
#define MU_REPORT() MU__SAFE_BLOCK(                                                                  \
    double minunit_end_real_timer;                                                                   \
    double minunit_end_proc_timer;                                                                   \
    printf("\n\n%d tests, %d assertions, %d failures\n", minunit_run, minunit_assert, minunit_fail); \
    minunit_end_real_timer = mu_timer_real();                                                        \
    minunit_end_proc_timer = mu_timer_cpu();                                                         \
    printf("\nFinished in %.8f seconds (real) %.8f seconds (proc)\n\n",                              \
           minunit_end_real_timer - minunit_real_timer,                                              \
           minunit_end_proc_timer - minunit_proc_timer);)

#define MU_RETURN() MU__SAFE_BLOCK( \
    return minunit_fail > 0 ? 1 : 0;)

/*  Assertions */
#define mu_check(test) MU__SAFE_BLOCK(                                                                                     \
    minunit_assert++;                                                                                                      \
    if (!(test)) {                                                                                                         \
      snprintf(minunit_last_message, MINUNIT_MESSAGE_LEN, "%s failed:\n\t%s:%d: %s", __func__, __FILE__, __LINE__, #test); \
      minunit_status = 1;                                                                                                  \
      return;                                                                                                              \
    } else {                                                                                                               \
      printf(".\n");                                                                                                       \
    })

#define mu_fail(message) MU__SAFE_BLOCK(                                                                                   \
    minunit_assert++;                                                                                                      \
    snprintf(minunit_last_message, MINUNIT_MESSAGE_LEN, "%s failed:\n\t%s:%d: %s", __func__, __FILE__, __LINE__, message); \
    minunit_status = 1;                                                                                                    \
    return;)

#define mu_assert(test, message) MU__SAFE_BLOCK(                                                                             \
    minunit_assert++;                                                                                                        \
    if (!(test)) {                                                                                                           \
      snprintf(minunit_last_message, MINUNIT_MESSAGE_LEN, "%s failed:\n\t%s:%d: %s", __func__, __FILE__, __LINE__, message); \
      minunit_status = 1;                                                                                                    \
      return;                                                                                                                \
    } else {                                                                                                                 \
      printf(".\n");                                                                                                         \
    })

#define mu_assert_int_eq(expected, result) MU__SAFE_BLOCK(                                                                                                            \
    int minunit_tmp_e;                                                                                                                                                \
    int minunit_tmp_r;                                                                                                                                                \
    minunit_assert++;                                                                                                                                                 \
    minunit_tmp_e = (expected);                                                                                                                                       \
    minunit_tmp_r = (result);                                                                                                                                         \
    if (minunit_tmp_e != minunit_tmp_r) {                                                                                                                             \
      snprintf(minunit_last_message, MINUNIT_MESSAGE_LEN, "%s failed:\n\t%s:%d: %d expected but was %d", __func__, __FILE__, __LINE__, minunit_tmp_e, minunit_tmp_r); \
      minunit_status = 1;                                                                                                                                             \
      return;                                                                                                                                                         \
    } else {                                                                                                                                                          \
      printf(".");                                                                                                                                                    \
    })

#define mu_assert_double_eq(expected, result) MU__SAFE_BLOCK(                                                                                                                                                                       \
    double minunit_tmp_e;                                                                                                                                                                                                           \
    double minunit_tmp_r;                                                                                                                                                                                                           \
    minunit_assert++;                                                                                                                                                                                                               \
    minunit_tmp_e = (expected);                                                                                                                                                                                                     \
    minunit_tmp_r = (result);                                                                                                                                                                                                       \
    if (fabs(minunit_tmp_e - minunit_tmp_r) > MINUNIT_EPSILON) {                                                                                                                                                                    \
      int minunit_significant_figures = 1 - log10(MINUNIT_EPSILON);                                                                                                                                                                 \
      snprintf(minunit_last_message, MINUNIT_MESSAGE_LEN, "%s failed:\n\t%s:%d: %.*g expected but was %.*g", __func__, __FILE__, __LINE__, minunit_significant_figures, minunit_tmp_e, minunit_significant_figures, minunit_tmp_r); \
      minunit_status = 1;                                                                                                                                                                                                           \
      return;                                                                                                                                                                                                                       \
    } else {                                                                                                                                                                                                                        \
      printf(".");                                                                                                                                                                                                                  \
    })

#define mu_assert_string_eq(expected, result) MU__SAFE_BLOCK(                                                                                                             \
    const char *minunit_tmp_e = expected;                                                                                                                                 \
    const char *minunit_tmp_r = result;                                                                                                                                   \
    minunit_assert++;                                                                                                                                                     \
    if (!minunit_tmp_e) {                                                                                                                                                 \
      minunit_tmp_e = "<null pointer>";                                                                                                                                   \
    } if (!minunit_tmp_r) {                                                                                                                                               \
      minunit_tmp_r = "<null pointer>";                                                                                                                                   \
    } if (strcmp(minunit_tmp_e, minunit_tmp_r)) {                                                                                                                         \
      snprintf(minunit_last_message, MINUNIT_MESSAGE_LEN, "%s failed:\n\t%s:%d: '%s' expected but was '%s'", __func__, __FILE__, __LINE__, minunit_tmp_e, minunit_tmp_r); \
      minunit_status = 1;                                                                                                                                                 \
      return;                                                                                                                                                             \
    } else {                                                                                                                                                              \
      printf(".");                                                                                                                                                        \
    })

  /*
 * The following two functions were written by David Robert Nadeau
 * from http://NadeauSoftware.com/ and distributed under the
 * Creative Commons Attribution 3.0 Unported License
 */

  /**
 * Returns the real time, in seconds, or -1.0 if an error occurred.
 *
 * Time is measured since an arbitrary and OS-dependent start time.
 * The returned real time is only useful for computing an elapsed time
 * between two calls to this function.
 */
  static double mu_timer_real(void)
  {
#if defined(_WIN32)
    /* Windows 2000 and later. ---------------------------------- */
    LARGE_INTEGER Time;
    LARGE_INTEGER Frequency;

    QueryPerformanceFrequency(&Frequency);
    QueryPerformanceCounter(&Time);

    Time.QuadPart *= 1000000;
    Time.QuadPart /= Frequency.QuadPart;

    return (double)Time.QuadPart / 1000000.0;

#elif (defined(__hpux) || defined(hpux)) || ((defined(__sun__) || defined(__sun) || defined(sun)) && (defined(__SVR4) || defined(__svr4__)))
  /* HP-UX, Solaris. ------------------------------------------ */
  return (double)gethrtime() / 1000000000.0;

#elif defined(__MACH__) && defined(__APPLE__)
  /* OSX. ----------------------------------------------------- */
  static double timeConvert = 0.0;
  if (timeConvert == 0.0)
  {
    mach_timebase_info_data_t timeBase;
    (void)mach_timebase_info(&timeBase);
    timeConvert = (double)timeBase.numer /
                  (double)timeBase.denom /
                  1000000000.0;
  }
  return (double)mach_absolute_time() * timeConvert;

#elif defined(_POSIX_VERSION)
  /* POSIX. --------------------------------------------------- */
  struct timeval tm;
#if defined(_POSIX_TIMERS) && (_POSIX_TIMERS > 0)
  {
    struct timespec ts;
#if defined(CLOCK_MONOTONIC_PRECISE)
    /* BSD. --------------------------------------------- */
    const clockid_t id = CLOCK_MONOTONIC_PRECISE;
#elif defined(CLOCK_MONOTONIC_RAW)
    /* Linux. ------------------------------------------- */
    const clockid_t id = CLOCK_MONOTONIC_RAW;
#elif defined(CLOCK_HIGHRES)
    /* Solaris. ----------------------------------------- */
    const clockid_t id = CLOCK_HIGHRES;
#elif defined(CLOCK_MONOTONIC)
    /* AIX, BSD, Linux, POSIX, Solaris. ----------------- */
    const clockid_t id = CLOCK_MONOTONIC;
#elif defined(CLOCK_REALTIME)
    /* AIX, BSD, HP-UX, Linux, POSIX. ------------------- */
    const clockid_t id = CLOCK_REALTIME;
#else
    const clockid_t id = (clockid_t)-1; /* Unknown. */
#endif /* CLOCK_* */
    if (id != (clockid_t)-1 && clock_gettime(id, &ts) != -1)
      return (double)ts.tv_sec +
             (double)ts.tv_nsec / 1000000000.0;
    /* Fall thru. */
  }
#endif /* _POSIX_TIMERS */

  /* AIX, BSD, Cygwin, HP-UX, Linux, OSX, POSIX, Solaris. ----- */
  gettimeofday(&tm, NULL);
  return (double)tm.tv_sec + (double)tm.tv_usec / 1000000.0;
#else
  return -1.0; /* Failed. */
#endif
  }

  /**
 * Returns the amount of CPU time used by the current process,
 * in seconds, or -1.0 if an error occurred.
 */
  static double mu_timer_cpu(void)
  {
#if defined(_WIN32)
    /* Windows -------------------------------------------------- */
    FILETIME createTime;
    FILETIME exitTime;
    FILETIME kernelTime;
    FILETIME userTime;

    /* This approach has a resolution of 1/64 second. Unfortunately, Windows' API does not offer better */
    if (GetProcessTimes(GetCurrentProcess(),
                        &createTime, &exitTime, &kernelTime, &userTime) != 0)
    {
      ULARGE_INTEGER userSystemTime;
      memcpy(&userSystemTime, &userTime, sizeof(ULARGE_INTEGER));
      return (double)userSystemTime.QuadPart / 10000000.0;
    }

#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
  /* AIX, BSD, Cygwin, HP-UX, Linux, OSX, and Solaris --------- */

#if defined(_POSIX_TIMERS) && (_POSIX_TIMERS > 0)
  /* Prefer high-res POSIX timers, when available. */
  {
    clockid_t id;
    struct timespec ts;
#if _POSIX_CPUTIME > 0
    /* Clock ids vary by OS.  Query the id, if possible. */
    if (clock_getcpuclockid(0, &id) == -1)
#endif
#if defined(CLOCK_PROCESS_CPUTIME_ID)
      /* Use known clock id for AIX, Linux, or Solaris. */
      id = CLOCK_PROCESS_CPUTIME_ID;
#elif defined(CLOCK_VIRTUAL)
    /* Use known clock id for BSD or HP-UX. */
    id = CLOCK_VIRTUAL;
#else
    id = (clockid_t)-1;
#endif
    if (id != (clockid_t)-1 && clock_gettime(id, &ts) != -1)
      return (double)ts.tv_sec +
             (double)ts.tv_nsec / 1000000000.0;
  }
#endif

#if defined(RUSAGE_SELF)
  {
    struct rusage rusage;
    if (getrusage(RUSAGE_SELF, &rusage) != -1)
      return (double)rusage.ru_utime.tv_sec +
             (double)rusage.ru_utime.tv_usec / 1000000.0;
  }
#endif

#if defined(_SC_CLK_TCK)
  {
    const double ticks = (double)sysconf(_SC_CLK_TCK);
    struct tms tms;
    if (times(&tms) != (clock_t)-1)
      return (double)tms.tms_utime / ticks;
  }
#endif

#if defined(CLOCKS_PER_SEC)
  {
    clock_t cl = clock();
    if (cl != (clock_t)-1)
      return (double)cl / (double)CLOCKS_PER_SEC;
  }
#endif

#endif

    return -1; /* Failed. */
  }

#ifdef __cplusplus
}
#endif

#endif /* MINUNIT_MINUNIT_H */
