/*
 * main.cpp -- test ElapsedTimer
 *
 * Copyright (c) 2013-2016 Malikania Authors
 *
 * 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.
 *
 * THE 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 <thread>

#include <gtest/gtest.h>

#include <malikania/elapsed-timer.hpp>

using namespace malikania;
using namespace std::chrono_literals;

/*
 * For all tests, we tolerate 30 ms because some systems have bigger lags.
 */
static constexpr int margin = 30;

class TestElapsedTimer : public testing::Test {
protected:
    ElapsedTimer m_timer;

    inline void assertRange(int value, int expected) const noexcept
    {
        if (value < (expected - margin) || value > (expected + margin)) {
            FAIL() << value << " is bigger than [" << (expected - margin) << ", " << (expected + margin) << "]";
        }
    }
};

TEST_F(TestElapsedTimer, standard)
{
    std::this_thread::sleep_for(300ms);

    assertRange(m_timer.elapsed(), 300);
}

TEST_F(TestElapsedTimer, reset)
{
    std::this_thread::sleep_for(300ms);

    m_timer.reset();

    assertRange(m_timer.elapsed(), 0);
}

TEST_F(TestElapsedTimer, pause)
{
    /*
     * Simulate a pause in the game like this:
     *
     * start     pause restart elapsed
     * |   10ms   |.5ms.| 6ms  |
     *
     * Since the game was paused, the 5ms must not be totalized.
     */
    std::this_thread::sleep_for(10ms);

    m_timer.pause();

    std::this_thread::sleep_for(5ms);

    m_timer.restart();

    std::this_thread::sleep_for(6ms);

    assertRange(m_timer.elapsed(), 16);
}

TEST_F(TestElapsedTimer, doublecheck)
{
    std::this_thread::sleep_for(50ms);

    (void)m_timer.elapsed();

    std::this_thread::sleep_for(50ms);

    assertRange(m_timer.elapsed(), 100);
}

int main(int argc, char **argv)
{
    testing::InitGoogleTest(&argc, argv);

    return RUN_ALL_TESTS();
}