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#include <QtTest/QtTest>

#include "../../shared/util.h"

#include <qevent.h>

#include <qwidget.h>

#include <qlayout.h>

#include <qgesture.h>

#include <qgesturerecognizer.h>

#include <qgraphicsitem.h>

#include <qgraphicsview.h>

#include <qdebug.h>

//TESTED_CLASS=

//TESTED_FILES=

static QPointF mapToGlobal(const QPointF &pt, QGraphicsItem *item, QGraphicsView *view)

{

    return view->mapToGlobal(view->mapFromScene(item->mapToScene(pt)));

}

class CustomGesture : public QGesture

{

    Q_OBJECT

public:

    static Qt::GestureType GestureType;

    CustomGesture(QObject *parent = 0)

        : QGesture(parent), serial(0)

    {

    }

    int serial;

    static const int SerialMaybeThreshold;

    static const int SerialStartedThreshold;

    static const int SerialFinishedThreshold;

};

Qt::GestureType CustomGesture::GestureType = Qt::CustomGesture;

const int CustomGesture::SerialMaybeThreshold = 1;

const int CustomGesture::SerialStartedThreshold = 3;

const int CustomGesture::SerialFinishedThreshold = 6;

class CustomEvent : public QEvent

{

public:

    static int EventType;

    CustomEvent(int serial_ = 0)

        : QEvent(QEvent::Type(CustomEvent::EventType)),

          serial(serial_), hasHotSpot(false)

    {

    }

    int serial;

    QPointF hotSpot;

    bool hasHotSpot;

};

int CustomEvent::EventType = 0;

class CustomGestureRecognizer : public QGestureRecognizer

{

public:

    CustomGestureRecognizer()

    {

        if (!CustomEvent::EventType)

            CustomEvent::EventType = QEvent::registerEventType();

    }

    QGesture* createGesture(QObject *)

    {

        return new CustomGesture;

    }

    QGestureRecognizer::Result filterEvent(QGesture *state, QObject*, QEvent *event)

    {

        if (event->type() == CustomEvent::EventType) {

            QGestureRecognizer::Result result = QGestureRecognizer::ConsumeEventHint;

            CustomGesture *g = static_cast<CustomGesture*>(state);

            CustomEvent *e = static_cast<CustomEvent*>(event);

            g->serial = e->serial;

            if (e->hasHotSpot)

                g->setHotSpot(e->hotSpot);

            if (g->serial >= CustomGesture::SerialFinishedThreshold)

                result |= QGestureRecognizer::GestureFinished;

            else if (g->serial >= CustomGesture::SerialStartedThreshold)

                result |= QGestureRecognizer::GestureTriggered;

            else if (g->serial >= CustomGesture::SerialMaybeThreshold)

                result |= QGestureRecognizer::MaybeGesture;

            else

                result = QGestureRecognizer::NotGesture;

            return result;

        }

        return QGestureRecognizer::Ignore;

    }

    void reset(QGesture *state)

    {

        CustomGesture *g = static_cast<CustomGesture*>(state);

        g->serial = 0;

        QGestureRecognizer::reset(state);

    }

};

// same as CustomGestureRecognizer but triggers early without the maybe state

class CustomContinuousGestureRecognizer : public QGestureRecognizer

{

public:

    CustomContinuousGestureRecognizer()

    {

        if (!CustomEvent::EventType)

            CustomEvent::EventType = QEvent::registerEventType();

    }

    QGesture* createGesture(QObject *)

    {

        return new CustomGesture;

    }

    QGestureRecognizer::Result filterEvent(QGesture *state, QObject*, QEvent *event)

    {

        if (event->type() == CustomEvent::EventType) {

            QGestureRecognizer::Result result = QGestureRecognizer::ConsumeEventHint;

            CustomGesture *g = static_cast<CustomGesture*>(state);

            CustomEvent *e = static_cast<CustomEvent*>(event);

            g->serial = e->serial;

            if (e->hasHotSpot)

                g->setHotSpot(e->hotSpot);

            if (g->serial >= CustomGesture::SerialFinishedThreshold)

                result |= QGestureRecognizer::GestureFinished;

            else if (g->serial >= CustomGesture::SerialMaybeThreshold)

                result |= QGestureRecognizer::GestureTriggered;

            else

                result = QGestureRecognizer::NotGesture;

            return result;

        }

        return QGestureRecognizer::Ignore;

    }

    void reset(QGesture *state)

    {

        CustomGesture *g = static_cast<CustomGesture*>(state);

        g->serial = 0;

        QGestureRecognizer::reset(state);

    }

};

class GestureWidget : public QWidget

{

    Q_OBJECT

public:

    GestureWidget(const char *name = 0, QWidget *parent = 0)

        : QWidget(parent)

    {

        if (name)

            setObjectName(QLatin1String(name));

        reset();

        acceptGestureOverride = false;

    }

    void reset()

    {

        customEventsReceived = 0;

        gestureEventsReceived = 0;

        gestureOverrideEventsReceived = 0;

        events.clear();

        overrideEvents.clear();

        ignoredGestures.clear();

    }

    int customEventsReceived;

    int gestureEventsReceived;

    int gestureOverrideEventsReceived;

    struct Events

    {

        QList<Qt::GestureType> all;

        QList<Qt::GestureType> started;

        QList<Qt::GestureType> updated;

        QList<Qt::GestureType> finished;

        QList<Qt::GestureType> canceled;

        void clear()

        {

            all.clear();

            started.clear();

            updated.clear();

            finished.clear();

            canceled.clear();

        }

    } events, overrideEvents;

    bool acceptGestureOverride;

    QSet<Qt::GestureType> ignoredGestures;

protected:

    bool event(QEvent *event)

    {

        Events *eventsPtr = 0;

        if (event->type() == QEvent::Gesture) {

            QGestureEvent *e = static_cast<QGestureEvent*>(event);

            ++gestureEventsReceived;

            eventsPtr = &events;

            foreach(Qt::GestureType type, ignoredGestures)

                e->ignore(e->gesture(type));

        } else if (event->type() == QEvent::GestureOverride) {

            ++gestureOverrideEventsReceived;

            eventsPtr = &overrideEvents;

            if (acceptGestureOverride)

                event->accept();

        }

        if (eventsPtr) {

            QGestureEvent *e = static_cast<QGestureEvent*>(event);

            QList<QGesture*> gestures = e->allGestures();

            foreach(QGesture *g, gestures) {

                eventsPtr->all << g->gestureType();

                switch(g->state()) {

                case Qt::GestureStarted:

                    eventsPtr->started << g->gestureType();

                    break;

                case Qt::GestureUpdated:

                    eventsPtr->updated << g->gestureType();

                    break;

                case Qt::GestureFinished:

                    eventsPtr->finished << g->gestureType();

                    break;

                case Qt::GestureCanceled:

                    eventsPtr->canceled << g->gestureType();

                    break;

                default:

                    Q_ASSERT(false);

                }

            }

        } else if (event->type() == CustomEvent::EventType) {

            ++customEventsReceived;

        } else {

            return QWidget::event(event);

        }

        return true;

    }

};

static void sendCustomGesture(CustomEvent *event, QObject *object, QGraphicsScene *scene = 0)

{

    for (int i = CustomGesture::SerialMaybeThreshold;

         i <= CustomGesture::SerialFinishedThreshold; ++i) {

        event->serial = i;

        if (scene)

            scene->sendEvent(qobject_cast<QGraphicsObject *>(object), event);

        else

            QApplication::sendEvent(object, event);

    }

}

class tst_Gestures : public QObject

{

Q_OBJECT

public:

    tst_Gestures();

    virtual ~tst_Gestures();

public slots:

    void initTestCase();

    void cleanupTestCase();

    void init();

    void cleanup();

private slots:

    void customGesture();

    void autoCancelingGestures();

    void gestureOverChild();

    void multipleWidgetOnlyGestureInTree();

    void conflictingGestures();

    void finishedWithoutStarted();

    void unknownGesture();

    void graphicsItemGesture();

    void graphicsItemTreeGesture();

    void explicitGraphicsObjectTarget();

    void gestureOverChildGraphicsItem();

    void twoGesturesOnDifferentLevel();

    void multipleGesturesInTree();

    void multipleGesturesInComplexTree();

    void testMapToScene();

};

tst_Gestures::tst_Gestures()

{

}

tst_Gestures::~tst_Gestures()

{

}

void tst_Gestures::initTestCase()

{

    CustomGesture::GestureType = qApp->registerGestureRecognizer(new CustomGestureRecognizer);

    QVERIFY(CustomGesture::GestureType != Qt::GestureType(0));

    QVERIFY(CustomGesture::GestureType != Qt::CustomGesture);

}

void tst_Gestures::cleanupTestCase()

{

}

void tst_Gestures::init()

{

}

void tst_Gestures::cleanup()

{

}

void tst_Gestures::customGesture()

{

    GestureWidget widget;

    widget.grabGesture(CustomGesture::GestureType, Qt::WidgetGesture);

    CustomEvent event;

    sendCustomGesture(&event, &widget);

    static const int TotalGestureEventsCount = CustomGesture::SerialFinishedThreshold - CustomGesture::SerialStartedThreshold + 1;

    static const int TotalCustomEventsCount = CustomGesture::SerialFinishedThreshold - CustomGesture::SerialMaybeThreshold + 1;

    QCOMPARE(widget.customEventsReceived, TotalCustomEventsCount);

    QCOMPARE(widget.gestureEventsReceived, TotalGestureEventsCount);

    QCOMPARE(widget.gestureOverrideEventsReceived, 0);

    QCOMPARE(widget.events.all.size(), TotalGestureEventsCount);

    for(int i = 0; i < widget.events.all.size(); ++i)

        QCOMPARE(widget.events.all.at(i), CustomGesture::GestureType);

    QCOMPARE(widget.events.started.size(), 1);

    QCOMPARE(widget.events.updated.size(), TotalGestureEventsCount - 2);

    QCOMPARE(widget.events.finished.size(), 1);

    QCOMPARE(widget.events.canceled.size(), 0);

}

void tst_Gestures::autoCancelingGestures()

{

    GestureWidget widget;

    widget.grabGesture(CustomGesture::GestureType, Qt::WidgetGesture);

    // send partial gesture. The gesture will be in the "maybe" state, but will

    // never get enough events to fire, so Qt will have to kill it.

    CustomEvent ev;

    for (int i = CustomGesture::SerialMaybeThreshold;

         i < CustomGesture::SerialStartedThreshold; ++i) {

        ev.serial = i;

        QApplication::sendEvent(&widget, &ev);

    }

    // wait long enough so the gesture manager will cancel the gesture

    QTest::qWait(5000);

    QCOMPARE(widget.customEventsReceived, CustomGesture::SerialStartedThreshold - CustomGesture::SerialMaybeThreshold);

    QCOMPARE(widget.gestureEventsReceived, 0);

    QCOMPARE(widget.gestureOverrideEventsReceived, 0);

    QCOMPARE(widget.events.all.size(), 0);

}

void tst_Gestures::gestureOverChild()

{

    GestureWidget widget("widget");

    QVBoxLayout *l = new QVBoxLayout(&widget);

    GestureWidget *child = new GestureWidget("child");

    l->addWidget(child);

    widget.grabGesture(CustomGesture::GestureType, Qt::WidgetGesture);

    CustomEvent event;

    sendCustomGesture(&event, child);

    static const int TotalGestureEventsCount = CustomGesture::SerialFinishedThreshold - CustomGesture::SerialStartedThreshold + 1;

    static const int TotalCustomEventsCount = CustomGesture::SerialFinishedThreshold - CustomGesture::SerialMaybeThreshold + 1;

    QCOMPARE(child->customEventsReceived, TotalCustomEventsCount);

    QCOMPARE(widget.customEventsReceived, 0);

    QCOMPARE(child->gestureEventsReceived, 0);

    QCOMPARE(child->gestureOverrideEventsReceived, 0);

    QCOMPARE(widget.gestureEventsReceived, 0);

    QCOMPARE(widget.gestureOverrideEventsReceived, 0);

    // enable gestures over the children

    widget.grabGesture(CustomGesture::GestureType, Qt::WidgetWithChildrenGesture);

    widget.reset();

    child->reset();

    sendCustomGesture(&event, child);

    QCOMPARE(child->customEventsReceived, TotalCustomEventsCount);

    QCOMPARE(widget.customEventsReceived, 0);

    QCOMPARE(child->gestureEventsReceived, 0);

    QCOMPARE(child->gestureOverrideEventsReceived, 0);

    QCOMPARE(widget.gestureEventsReceived, TotalGestureEventsCount);

    QCOMPARE(widget.gestureOverrideEventsReceived, 0);

    for(int i = 0; i < widget.events.all.size(); ++i)

        QCOMPARE(widget.events.all.at(i), CustomGesture::GestureType);

    QCOMPARE(widget.events.started.size(), 1);

    QCOMPARE(widget.events.updated.size(), TotalGestureEventsCount - 2);

    QCOMPARE(widget.events.finished.size(), 1);

    QCOMPARE(widget.events.canceled.size(), 0);

}

void tst_Gestures::multipleWidgetOnlyGestureInTree()

{

    GestureWidget parent("parent");

    QVBoxLayout *l = new QVBoxLayout(&parent);

    GestureWidget *child = new GestureWidget("child");

    l->addWidget(child);

    parent.grabGesture(CustomGesture::GestureType, Qt::WidgetGesture);

    child->grabGesture(CustomGesture::GestureType, Qt::WidgetGesture);

    static const int TotalGestureEventsCount = CustomGesture::SerialFinishedThreshold - CustomGesture::SerialStartedThreshold + 1;

    static const int TotalCustomEventsCount = CustomGesture::SerialFinishedThreshold - CustomGesture::SerialMaybeThreshold + 1;

    // sending events to the child and making sure there is no conflict

    CustomEvent event;

    sendCustomGesture(&event, child);

    QCOMPARE(child->customEventsReceived, TotalCustomEventsCount);

    QCOMPARE(parent.customEventsReceived, 0);

    QCOMPARE(child->gestureEventsReceived, TotalGestureEventsCount);

    QCOMPARE(child->gestureOverrideEventsReceived, 0);

    QCOMPARE(parent.gestureEventsReceived, 0);

    QCOMPARE(parent.gestureOverrideEventsReceived, 0);

    parent.reset();

    child->reset();

    // same for the parent widget

    sendCustomGesture(&event, &parent);

    QCOMPARE(child->customEventsReceived, 0);

    QCOMPARE(parent.customEventsReceived, TotalCustomEventsCount);

    QCOMPARE(child->gestureEventsReceived, 0);

    QCOMPARE(child->gestureOverrideEventsReceived, 0);

    QCOMPARE(parent.gestureEventsReceived, TotalGestureEventsCount);

    QCOMPARE(parent.gestureOverrideEventsReceived, 0);

}

void tst_Gestures::conflictingGestures()

{

    GestureWidget parent("parent");

    QVBoxLayout *l = new QVBoxLayout(&parent);

    GestureWidget *child = new GestureWidget("child");

    l->addWidget(child);

    parent.grabGesture(CustomGesture::GestureType, Qt::WidgetWithChildrenGesture);

    child->grabGesture(CustomGesture::GestureType, Qt::WidgetWithChildrenGesture);

    static const int TotalGestureEventsCount = CustomGesture::SerialFinishedThreshold - CustomGesture::SerialStartedThreshold + 1;

    // child accepts the override, parent will not receive anything

    parent.acceptGestureOverride = false;

    child->acceptGestureOverride = true;

    // sending events to the child and making sure there is no conflict

    CustomEvent event;

    sendCustomGesture(&event, child);

    QCOMPARE(child->gestureOverrideEventsReceived, 1);

    QCOMPARE(child->gestureEventsReceived, TotalGestureEventsCount);

    QCOMPARE(parent.gestureOverrideEventsReceived, 0);

    QCOMPARE(parent.gestureEventsReceived, 0);

    parent.reset();

    child->reset();

    // parent accepts the override

    parent.acceptGestureOverride = true;

    child->acceptGestureOverride = false;

    // sending events to the child and making sure there is no conflict

    sendCustomGesture(&event, child);

    QCOMPARE(child->gestureOverrideEventsReceived, 1);

    QCOMPARE(child->gestureEventsReceived, 0);

    QCOMPARE(parent.gestureOverrideEventsReceived, 1);

    QCOMPARE(parent.gestureEventsReceived, TotalGestureEventsCount);

    parent.reset();

    child->reset();

    // nobody accepts the override, we will send normal events to the closest context (to the child)

    parent.acceptGestureOverride = false;

    child->acceptGestureOverride = false;

    child->ignoredGestures << CustomGesture::GestureType;

    // sending events to the child and making sure there is no conflict

    sendCustomGesture(&event, child);