/* Unit tests for time related utilities.
 *
 * Author: Steffen Vogel <post@steffenvogel.de>
 * SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
 * SPDX-License-Identifier: Apache-2.0
 */

#include <criterion/criterion.h>
#include <math.h>
#include <unistd.h>

#include <villas/timing.hpp>

// cppcheck-suppress unknownMacro
TestSuite(timing, .description = "Time measurements");

Test(timing, time_now) {
  struct timespec now1 = time_now();
  struct timespec now2 = time_now();

  cr_assert(time_cmp(&now1, &now2) <= 0, "time_now() was reordered!");
}

Test(timing, time_diff) {
  struct timespec ts1 = {.tv_sec = 0, .tv_nsec = 1}; // Value doesnt matter
  struct timespec ts2 = {.tv_sec = 1,
                         .tv_nsec = 0}; // Overflow in nano seconds!

  struct timespec ts3 = time_diff(&ts1, &ts2);

  // ts4 == ts2?
  cr_assert_eq(ts3.tv_sec, 0);
  cr_assert_eq(ts3.tv_nsec, 999999999);
}

Test(timing, time_add) {
  struct timespec ts1 = {.tv_sec = 1,
                         .tv_nsec = 999999999}; // Value doesnt matter
  struct timespec ts2 = {.tv_sec = 1,
                         .tv_nsec = 1}; // Overflow in nano seconds!

  struct timespec ts3 = time_add(&ts1, &ts2);

  // ts4 == ts2?
  cr_assert_eq(ts3.tv_sec, 3);
  cr_assert_eq(ts3.tv_nsec, 0);
}

Test(timing, time_delta) {
  struct timespec ts1 = {.tv_sec = 1, .tv_nsec = 123}; // Value doesnt matter
  struct timespec ts2 = {.tv_sec = 5,
                         .tv_nsec = 246}; // Overflow in nano seconds!

  double delta = time_delta(&ts1, &ts2);

  cr_assert_float_eq(delta, 4 + 123e-9, 1e-9);
}

Test(timing, time_from_double) {
  double ref = 1234.56789;

  struct timespec ts = time_from_double(ref);

  cr_assert_eq(ts.tv_sec, 1234);
  cr_assert_eq(ts.tv_nsec, 567890000);
}

Test(timing, time_to_from_double) {
  double ref = 1234.56789;

  struct timespec ts = time_from_double(ref);
  double dbl = time_to_double(&ts);

  cr_assert_float_eq(dbl, ref, 1e-9);
}