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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtCore/QString>
#include <QtCore/QTime>
#include <QtCore/QElapsedTimer>
#include <QtTest/QtTest>

static const int minResolution = 100; // the minimum resolution for the tests

QDebug operator<<(QDebug s, const QElapsedTimer &t)
{
    s.nospace() << "(" << t.msecsSinceReference() << ")";
    return s.space();
}

class tst_QElapsedTimer : public QObject
{
    Q_OBJECT

private Q_SLOTS:
    void statics();
    void validity();
    void basics();
    void elapsed();
    void msecsTo();
};

void tst_QElapsedTimer::statics()
{
    qDebug() << "Clock type is" << QElapsedTimer::clockType();
    qDebug() << "Said clock is" << (QElapsedTimer::isMonotonic() ? "monotonic" : "not monotonic");
    QElapsedTimer t;
    t.start();
    qDebug() << "Current time is" << t.msecsSinceReference();
}

void tst_QElapsedTimer::validity()
{
    QElapsedTimer t;

    QVERIFY(!t.isValid()); // non-POD now, it should always start invalid

    t.start();
    QVERIFY(t.isValid());

    t.invalidate();
    QVERIFY(!t.isValid());
}

void tst_QElapsedTimer::basics()
{
    QElapsedTimer t1;
    t1.start();

    QVERIFY(t1.msecsSinceReference() != 0);

    QCOMPARE(t1, t1);
    QVERIFY(!(t1 != t1));
    QVERIFY(!(t1 < t1));
    QCOMPARE(t1.msecsTo(t1), qint64(0));
    QCOMPARE(t1.secsTo(t1), qint64(0));

    quint64 value1 = t1.msecsSinceReference();
    qDebug() << "value1:" << value1 << "t1:" << t1;
    qint64 nsecs = t1.nsecsElapsed();
    qint64 elapsed = t1.restart();
    QVERIFY(elapsed < minResolution);
    QVERIFY(nsecs / 1000000 < minResolution);

    quint64 value2 = t1.msecsSinceReference();
    qDebug() << "value2:" << value2 << "t1:" << t1
             << "elapsed:" << elapsed << "nsecs:" << nsecs;
    // in theory, elapsed == value2 - value1

    // However, since QElapsedTimer keeps internally the full resolution,
    // we have here a rounding error due to integer division
    QVERIFY(qAbs(elapsed - qint64(value2 - value1)) <= 1);
}

void tst_QElapsedTimer::elapsed()
{
    QElapsedTimer t1;
    t1.start();

    QTest::qSleep(2*minResolution);

    auto nsecs = t1.nsecsElapsed();
    auto msecs = t1.elapsed();
    QVERIFY(nsecs > 0);
    QVERIFY(msecs > 0);
    // the number of elapsed nanoseconds and milliseconds should match
    QVERIFY(nsecs - msecs * 1000000 < 1000000);

    if (msecs > 8 * minResolution)
        QSKIP("Sampling timer took too long, aborting test");

    QVERIFY(t1.hasExpired(minResolution));
    QVERIFY(!t1.hasExpired(8*minResolution));
    QVERIFY(!t1.hasExpired(-1));

    qint64 elapsed = t1.restart();
    QVERIFY(elapsed >= msecs);
    QVERIFY(elapsed < msecs + 3*minResolution);
}

void tst_QElapsedTimer::msecsTo()
{
    QElapsedTimer t1;
    t1.start();
    QTest::qSleep(minResolution);
    QElapsedTimer t2;
    t2.start();

    QVERIFY(t1 != t2);
    QVERIFY(!(t1 == t2));
    QVERIFY(t1 < t2);

    auto diff = t1.msecsTo(t2);
    QVERIFY2(diff > 0, QString("difference t1 and t2 is %1").arg(diff).toLatin1());
    diff = t2.msecsTo(t1);
    QVERIFY2(diff < 0, QString("difference t2 and t1 is %1").arg(diff).toLatin1());
}

QTEST_MAIN(tst_QElapsedTimer);

#include "tst_qelapsedtimer.moc"