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#include <QtCore/QString>

#include <QtCore/QTime>

#include <QtCore/QElapsedTimer>

#include <QtTest/QtTest>

static const int minResolution = 50; // the minimum resolution for the tests

QDebug operator<<(QDebug s, const QElapsedTimer &t)

{

    union {

        QElapsedTimer t;

        struct { qint64 t1, t2; } i;

    } copy;

    copy.t = t;

    s.nospace() << "(" <<  copy.i.t1 << ", " << copy.i.t2 << ")";

    return s.space();

}

class tst_QElapsedTimer : public QObject

{

    Q_OBJECT

private Q_SLOTS:

    void statics();

    void validity();

    void basics();

    void elapsed();

};

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;

    t.invalidate();

    QVERIFY(!t.isValid());

    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));

//    QCOMPARE(t1 + 0, t1);

//    QCOMPARE(t1 - 0, t1);

#if 0

    QElapsedTimer t2 = t1;

    t2 += 1000;   // so we can use secsTo

    QVERIFY(t1 != t2);

    QVERIFY(!(t1 == t2));

    QVERIFY(t1 < t2);

    QVERIFY(!(t2 < t1));

    QCOMPARE(t1.msecsTo(t2), qint64(1000));

    QCOMPARE(t1.secsTo(t2), qint64(1));

//    QCOMPARE(t2 - t1, qint64(1000));

//    QCOMPARE(t1 - t2, qint64(-1000));

#endif

    quint64 value1 = t1.msecsSinceReference();

    qDebug() << value1 << t1;

    qint64 elapsed = t1.restart();

    QVERIFY(elapsed < minResolution);

    quint64 value2 = t1.msecsSinceReference();

    qDebug() << value2 << t1 << elapsed;

    // 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(4*minResolution);

    QElapsedTimer t2;

    t2.start();

    QVERIFY(t1 != t2);

    QVERIFY(!(t1 == t2));

    QVERIFY(t1 < t2);

    QVERIFY(t1.msecsTo(t2) > 0);

    // don't check: t1.secsTo(t2)

//    QVERIFY(t1 - t2 < 0);

    QVERIFY(t1.elapsed() > 0);

    QVERIFY(t1.hasExpired(minResolution));

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

    QVERIFY(!t2.hasExpired(minResolution));

    QVERIFY(!t1.hasExpired(-1));

    QVERIFY(!t2.hasExpired(-1));

    qint64 elapsed = t1.restart();

    QVERIFY(elapsed > 3*minResolution);

    QVERIFY(elapsed < 5*minResolution);

    qint64 diff = t2.msecsTo(t1);

    QVERIFY(diff < minResolution);

}

QTEST_MAIN(tst_QElapsedTimer);

#include "tst_qelapsedtimer.moc"