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#ifdef QT_GUI_LIB
#  include <QtGui/QGuiApplication>
#else
#  include <QtCore/QCoreApplication>
#endif
#include <QtTest/QtTest>

enum {
    PreciseTimerInterval    =   10,
    CoarseTimerInterval     =  200,
    VeryCoarseTimerInterval = 1000
};

class tst_QEventDispatcher : public QObject
{
    Q_OBJECT

    QAbstractEventDispatcher *eventDispatcher;
    int receivedEventType;
    int timerIdFromEvent;

protected:
    bool event(QEvent *e);

public:
    inline tst_QEventDispatcher()
        : QObject(),
          eventDispatcher(QAbstractEventDispatcher::instance(thread())),
          receivedEventType(-1),
          timerIdFromEvent(-1)
    { }

private slots:
    void initTestCase();
    void registerTimer();
    /* void registerSocketNotifier(); */ // Not implemented here, see tst_QSocketNotifier instead
    /* void registerEventNotifiier(); */ // Not implemented here, see tst_QWinEventNotifier instead
    void sendPostedEvents_data();
    void sendPostedEvents();
    void processEventsOnlySendsQueuedEvents();
};

bool tst_QEventDispatcher::event(QEvent *e)
{
    switch (receivedEventType = e->type()) {
    case QEvent::Timer:
    {
        timerIdFromEvent = static_cast<QTimerEvent *>(e)->timerId();
        return true;
    }
    default:
        break;
    }
    return QObject::event(e);
}

// drain the system event queue after the test starts to avoid destabilizing the test functions
void tst_QEventDispatcher::initTestCase()
{
    QElapsedTimer elapsedTimer;
    elapsedTimer.start();
    while (!elapsedTimer.hasExpired(CoarseTimerInterval) && eventDispatcher->processEvents(QEventLoop::AllEvents)) {
            ;
    }
}

// test that the eventDispatcher's timer implementation is complete and working
void tst_QEventDispatcher::registerTimer()
{
#define FIND_TIMERS() \
        do { \
            foundPrecise = false; \
            foundCoarse = false; \
            foundVeryCoarse = false; \
            for (int i = 0; i < registeredTimers.count(); ++i) { \
                const QAbstractEventDispatcher::TimerInfo &timerInfo = registeredTimers.at(i); \
                if (timerInfo.timerId == preciseTimerId) { \
                    QCOMPARE(timerInfo.interval, int(PreciseTimerInterval)); \
                    QCOMPARE(timerInfo.timerType, Qt::PreciseTimer); \
                    foundPrecise = true; \
                } else if (timerInfo.timerId == coarseTimerId) { \
                    QCOMPARE(timerInfo.interval, int(CoarseTimerInterval)); \
                    QCOMPARE(timerInfo.timerType, Qt::CoarseTimer); \
                    foundCoarse = true; \
                } else if (timerInfo.timerId == veryCoarseTimerId) { \
                    QCOMPARE(timerInfo.interval, int(VeryCoarseTimerInterval)); \
                    QCOMPARE(timerInfo.timerType, Qt::VeryCoarseTimer); \
                    foundVeryCoarse = true; \
                } \
            } \
        } while (0)

    // start 3 timers, each with the different timer types and different intervals
    int preciseTimerId = eventDispatcher->registerTimer(PreciseTimerInterval, Qt::PreciseTimer, this);
    int coarseTimerId = eventDispatcher->registerTimer(CoarseTimerInterval, Qt::CoarseTimer, this);
    int veryCoarseTimerId = eventDispatcher->registerTimer(VeryCoarseTimerInterval, Qt::VeryCoarseTimer, this);
    QVERIFY(preciseTimerId > 0);
    QVERIFY(coarseTimerId > 0);
    QVERIFY(veryCoarseTimerId > 0);

    // check that all 3 are present in the eventDispatcher's registeredTimer() list
    QList<QAbstractEventDispatcher::TimerInfo> registeredTimers = eventDispatcher->registeredTimers(this);
    QCOMPARE(registeredTimers.count(), 3);
    bool foundPrecise, foundCoarse, foundVeryCoarse;
    FIND_TIMERS();
    QVERIFY(foundPrecise && foundCoarse && foundVeryCoarse);

    // process events, waiting for the next event... this should only fire the precise timer
    receivedEventType = -1;
    timerIdFromEvent = -1;
    QTRY_COMPARE_WITH_TIMEOUT(receivedEventType, int(QEvent::Timer), PreciseTimerInterval * 2);
    QCOMPARE(timerIdFromEvent, preciseTimerId);
    // now unregister it and make sure it's gone
    eventDispatcher->unregisterTimer(preciseTimerId);
    registeredTimers = eventDispatcher->registeredTimers(this);
    QCOMPARE(registeredTimers.count(), 2);
    FIND_TIMERS();
    QVERIFY(!foundPrecise && foundCoarse && foundVeryCoarse);

    // do the same again for the coarse timer
    receivedEventType = -1;
    timerIdFromEvent = -1;
    QTRY_COMPARE_WITH_TIMEOUT(receivedEventType, int(QEvent::Timer), CoarseTimerInterval * 2);
    QCOMPARE(timerIdFromEvent, coarseTimerId);
    // now unregister it and make sure it's gone
    eventDispatcher->unregisterTimer(coarseTimerId);
    registeredTimers = eventDispatcher->registeredTimers(this);
    QCOMPARE(registeredTimers.count(), 1);
    FIND_TIMERS();
    QVERIFY(!foundPrecise && !foundCoarse && foundVeryCoarse);

    // not going to wait for the VeryCoarseTimer, would take too long, just unregister it
    eventDispatcher->unregisterTimers(this);
    registeredTimers = eventDispatcher->registeredTimers(this);
    QVERIFY(registeredTimers.isEmpty());

#undef FIND_TIMERS
}

void tst_QEventDispatcher::sendPostedEvents_data()
{
    QTest::addColumn<int>("processEventsFlagsInt");

    QTest::newRow("WaitForMoreEvents") << int(QEventLoop::WaitForMoreEvents);
    QTest::newRow("AllEvents") << int(QEventLoop::AllEvents);
}

// test that the eventDispatcher sends posted events correctly
void tst_QEventDispatcher::sendPostedEvents()
{
    QFETCH(int, processEventsFlagsInt);
    QEventLoop::ProcessEventsFlags processEventsFlags = QEventLoop::ProcessEventsFlags(processEventsFlagsInt);

    QElapsedTimer elapsedTimer;
    elapsedTimer.start();
    while (!elapsedTimer.hasExpired(200)) {
        receivedEventType = -1;
        QCoreApplication::postEvent(this, new QEvent(QEvent::User));

        // event shouldn't be delivered as a result of posting
        QCOMPARE(receivedEventType, -1);

        // since there is a pending posted event, this should not actually block, it should send the posted event and return
        QVERIFY(eventDispatcher->processEvents(processEventsFlags));
        // event shouldn't be delivered as a result of posting
        QCOMPARE(receivedEventType, int(QEvent::User));
    }
}

class ProcessEventsOnlySendsQueuedEvents : public QObject
{
    Q_OBJECT
public:
    int eventsReceived;

    inline ProcessEventsOnlySendsQueuedEvents() : eventsReceived(0) {}

    bool event(QEvent *event)
    {
        ++eventsReceived;

        if (event->type() == QEvent::User)
             QCoreApplication::postEvent(this, new QEvent(QEvent::Type(QEvent::User + 1)));

        return QObject::event(event);
    }
public slots:
    void timerFired()
    {
        QCoreApplication::postEvent(this, new QEvent(QEvent::Type(QEvent::User + 1)));
    }
};

void tst_QEventDispatcher::processEventsOnlySendsQueuedEvents()
{
    ProcessEventsOnlySendsQueuedEvents object;

    // Posted events during event processing should be handled on
    // the next processEvents iteration.
    QCoreApplication::postEvent(&object, new QEvent(QEvent::User));
    QCoreApplication::processEvents();
    QCOMPARE(object.eventsReceived, 1);
    QCoreApplication::processEvents();
    QCOMPARE(object.eventsReceived, 2);

    // The same goes for posted events during timer processing
    QTimer::singleShot(0, &object, SLOT(timerFired()));
    QCoreApplication::processEvents();
    QCOMPARE(object.eventsReceived, 3);
    QCoreApplication::processEvents();
    QCOMPARE(object.eventsReceived, 4);
}

QTEST_MAIN(tst_QEventDispatcher)
#include "tst_qeventdispatcher.moc"
