/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/TimeStamp.h"

#include "prinrval.h"
#include "prthread.h"

#include "gtest/gtest.h"

using mozilla::TimeStamp;
using mozilla::TimeDuration;

TEST(TimeStamp, Main)
{
    TimeDuration td;
    EXPECT_TRUE(td.ToSeconds() == 0.0);
    EXPECT_TRUE(TimeDuration::FromSeconds(5).ToSeconds() == 5.0);
    EXPECT_TRUE(TimeDuration::FromMilliseconds(5000).ToSeconds() == 5.0);
    EXPECT_TRUE(TimeDuration::FromSeconds(1) < TimeDuration::FromSeconds(2));
    EXPECT_FALSE(TimeDuration::FromSeconds(1) < TimeDuration::FromSeconds(1));
    EXPECT_TRUE(TimeDuration::FromSeconds(2) > TimeDuration::FromSeconds(1));
    EXPECT_FALSE(TimeDuration::FromSeconds(1) > TimeDuration::FromSeconds(1));
    EXPECT_TRUE(TimeDuration::FromSeconds(1) <= TimeDuration::FromSeconds(2));
    EXPECT_TRUE(TimeDuration::FromSeconds(1) <= TimeDuration::FromSeconds(1));
    EXPECT_FALSE(TimeDuration::FromSeconds(2) <= TimeDuration::FromSeconds(1));
    EXPECT_TRUE(TimeDuration::FromSeconds(2) >= TimeDuration::FromSeconds(1));
    EXPECT_TRUE(TimeDuration::FromSeconds(1) >= TimeDuration::FromSeconds(1));
    EXPECT_FALSE(TimeDuration::FromSeconds(1) >= TimeDuration::FromSeconds(2));

    TimeStamp ts;
    EXPECT_TRUE(ts.IsNull());

    ts = TimeStamp::Now();
    EXPECT_TRUE(!ts.IsNull());
    EXPECT_TRUE((ts - ts).ToSeconds() == 0.0);

    PR_Sleep(PR_SecondsToInterval(2));

    TimeStamp ts2(TimeStamp::Now());
    EXPECT_TRUE(ts2 > ts);
    EXPECT_FALSE(ts > ts);
    EXPECT_TRUE(ts < ts2);
    EXPECT_FALSE(ts < ts);
    EXPECT_TRUE(ts <= ts2);
    EXPECT_TRUE(ts <= ts);
    EXPECT_FALSE(ts2 <= ts);
    EXPECT_TRUE(ts2 >= ts);
    EXPECT_TRUE(ts2 >= ts);
    EXPECT_FALSE(ts >= ts2);

    // We can't be sure exactly how long PR_Sleep slept for. It should have
    // slept for at least one second. We might have slept a lot longer due
    // to process scheduling, but hopefully not more than 10 seconds.
    td = ts2 - ts;
    EXPECT_TRUE(td.ToSeconds() > 1.0);
    EXPECT_TRUE(td.ToSeconds() < 20.0);
    td = ts - ts2;
    EXPECT_TRUE(td.ToSeconds() < -1.0);
    EXPECT_TRUE(td.ToSeconds() > -20.0);

    double resolution = TimeDuration::Resolution().ToSecondsSigDigits();
    printf(" (platform timer resolution is ~%g s)\n", resolution);
    EXPECT_TRUE(1e-10 < resolution);
    // Don't upper-bound sanity check ... although NSPR reports 1ms
    // resolution, it might be lying, so we shouldn't compare with it
}
