// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include <QtTest/QTest>
#include <QtTest/QSignalSpy>
#include <QtGui/QStyleHints>
#include <qpa/qwindowsysteminterface.h>
#include <private/qquickwheelhandler_p.h>
#include <QtQuick/private/qquickrectangle_p.h>
#include <QtQuick/qquickview.h>
#include <QtQml/qqmlcontext.h>
#include <QtQuickTestUtils/private/qmlutils_p.h>
#include <QtQuickTestUtils/private/viewtestutils_p.h>

Q_LOGGING_CATEGORY(lcPointerTests, "qt.quick.pointer.tests")

class tst_QQuickWheelHandler: public QQmlDataTest
{
    Q_OBJECT
public:
    tst_QQuickWheelHandler() : QQmlDataTest(QT_QMLTEST_DATADIR) { }

private slots:
    void singleHandler_data();
    void singleHandler();
    void nestedHandler_data();
    void nestedHandler();
    void blocking_data();
    void blocking();

private:
    void sendWheelEvent(QQuickView &window, QPoint pos, QPoint angleDelta,
                        QPoint pixelDelta = QPoint(), Qt::KeyboardModifiers modifiers = Qt::NoModifier,
                        Qt::ScrollPhase phase = Qt::NoScrollPhase, bool inverted = false);
};

void tst_QQuickWheelHandler::sendWheelEvent(QQuickView &window, QPoint pos, QPoint angleDelta,
                                            QPoint pixelDelta, Qt::KeyboardModifiers modifiers, Qt::ScrollPhase phase, bool inverted)
{
    QWheelEvent wheelEvent(pos, window.mapToGlobal(pos), pixelDelta, angleDelta,
                           Qt::NoButton, modifiers, phase, inverted);
    QGuiApplication::sendEvent(&window, &wheelEvent);
    qApp->processEvents();
}

void tst_QQuickWheelHandler::singleHandler_data()
{
    // handler properties
    QTest::addColumn<Qt::Orientation>("orientation");
    QTest::addColumn<bool>("invertible");
    QTest::addColumn<int>("rotationScale");
    QTest::addColumn<QString>("property");
    QTest::addColumn<qreal>("targetScaleMultiplier");
    QTest::addColumn<bool>("targetTransformAroundCursor");
    // event
    QTest::addColumn<QPoint>("eventPos");
    QTest::addColumn<QPoint>("eventAngleDelta");
    QTest::addColumn<QPoint>("eventPixelDelta");
    QTest::addColumn<Qt::KeyboardModifiers>("eventModifiers");
    QTest::addColumn<bool>("eventPhases");
    QTest::addColumn<bool>("eventInverted");
    // result
    QTest::addColumn<QPoint>("expectedPosition");
    QTest::addColumn<qreal>("expectedScale");
    QTest::addColumn<int>("expectedRotation");

    // move the item
    QTest::newRow("vertical wheel angle delta to adjust x")
            << Qt::Vertical << false << 1 << "x" << 1.5 << true
            << QPoint(160, 120) << QPoint(-360, 120) << QPoint() << Qt::KeyboardModifiers(Qt::NoModifier) << false << false
            << QPoint(15, 0) << 1.0 << 0;
    QTest::newRow("horizontal wheel angle delta to adjust y")
            << Qt::Horizontal << false << 1 << "y" << 1.5 << false
            << QPoint(160, 120) << QPoint(-360, 120) << QPoint() << Qt::KeyboardModifiers(Qt::NoModifier) << false << false
            << QPoint(0, -45) << 1.0 << 0;
    QTest::newRow("vertical wheel angle delta to adjust y, amplified and inverted")
            << Qt::Vertical << true << 4 << "y" << 1.5 << true
            << QPoint(160, 120) << QPoint(60, 60) << QPoint() << Qt::KeyboardModifiers(Qt::NoModifier) << false << true
            << QPoint(0, 30) << 1.0 << 0;
    QTest::newRow("horizontal wheel angle delta to adjust x, amplified and reversed")
            << Qt::Horizontal << false << -4 << "x" << 1.5 << false
            << QPoint(160, 120) << QPoint(60, 60) << QPoint() << Qt::KeyboardModifiers(Qt::NoModifier) << false << false
            << QPoint(-30, 0) << 1.0 << 0;
    QTest::newRow("vertical wheel pixel delta to adjust x")
            << Qt::Vertical << false << 1 << "x" << 1.5 << true
            << QPoint(160, 120) << QPoint(-360, 120) << QPoint(20, 20) << Qt::KeyboardModifiers(Qt::NoModifier) << true << false
            << QPoint(20, 0) << 1.0 << 0;
    QTest::newRow("horizontal wheel pixel delta to adjust y")
            << Qt::Horizontal << false << 1 << "y" << 1.5 << false
            << QPoint(160, 120) << QPoint(-360, 120) << QPoint(20, 20) << Qt::KeyboardModifiers(Qt::NoModifier) << true << false
            << QPoint(0, 20) << 1.0 << 0;
    QTest::newRow("vertical wheel pixel delta to adjust y, amplified and inverted")
            << Qt::Vertical << true << 4 << "y" << 1.5 << true
            << QPoint(160, 120) << QPoint(60, 60) << QPoint(20, 20) << Qt::KeyboardModifiers(Qt::NoModifier) << true << true
            << QPoint(0, 80) << 1.0 << 0;
    QTest::newRow("horizontal wheel pixel delta to adjust x, amplified and reversed")
            << Qt::Horizontal << false << -4 << "x" << 1.5 << false
            << QPoint(160, 120) << QPoint(60, 60) << QPoint(20, 20) << Qt::KeyboardModifiers(Qt::NoModifier) << true << false
            << QPoint(-80, 0) << 1.0 << 0;

    // scale the item
    QTest::newRow("vertical wheel angle delta to adjust scale")
            << Qt::Vertical << false << 1 << "scale" << 1.5 << true
            << QPoint(50, 32) << QPoint(360, 120) << QPoint() << Qt::KeyboardModifiers(Qt::NoModifier) << false << false
            << QPoint(55, 44) << 1.5 << 0;
    QTest::newRow("horizontal wheel angle delta to adjust scale, amplified and reversed, don't adjust position")
            << Qt::Horizontal << false << -2 << "scale" << 1.5 << false
            << QPoint(50, 32) << QPoint(-240, 360) << QPoint() << Qt::KeyboardModifiers(Qt::NoModifier) << false << false
            << QPoint(0, 0) << 5.0625 << 0;

    // rotate the item
    QTest::newRow("vertical wheel angle delta to adjust rotation")
            << Qt::Vertical << false << 1 << "rotation" << 1.5 << true
            << QPoint(50, 32) << QPoint(360, -120) << QPoint() << Qt::KeyboardModifiers(Qt::NoModifier) << false << false
            << QPoint(19, -31) << 1.0 << -15;
    QTest::newRow("horizontal wheel angle delta to adjust rotation, amplified and reversed, don't adjust position")
            << Qt::Horizontal << false << -2 << "rotation" << 1.5 << false
            << QPoint(80, 80) << QPoint(240, 360) << QPoint() << Qt::KeyboardModifiers(Qt::NoModifier) << false << false
            << QPoint(0, 0) << 1.0 << -60;
}

void tst_QQuickWheelHandler::singleHandler()
{
    // handler properties
    QFETCH(Qt::Orientation, orientation);
    QFETCH(bool, invertible);
    QFETCH(int, rotationScale);
    QFETCH(QString, property);
    QFETCH(qreal, targetScaleMultiplier);
    QFETCH(bool, targetTransformAroundCursor);
    // event
    QFETCH(QPoint, eventPos);
    QFETCH(QPoint, eventAngleDelta);
    QFETCH(QPoint, eventPixelDelta);
    QFETCH(Qt::KeyboardModifiers, eventModifiers);
    QFETCH(bool, eventPhases);
    QFETCH(bool, eventInverted);
    // result
    QFETCH(QPoint, expectedPosition);
    QFETCH(qreal, expectedScale);
    QFETCH(int, expectedRotation);

    QQuickView window;
    QByteArray errorMessage;
    QVERIFY2(QQuickTest::initView(window, testFileUrl("rectWheel.qml"), true, &errorMessage), errorMessage.constData());
    window.show();
    QVERIFY(QTest::qWaitForWindowExposed(&window));

    QQuickItem *rect = window.rootObject();
    QVERIFY(rect != nullptr);
    QQuickWheelHandler *handler = rect->findChild<QQuickWheelHandler*>();
    QVERIFY(handler != nullptr);
    handler->setOrientation(orientation);
    handler->setInvertible(invertible);
    handler->setRotationScale(rotationScale);
    handler->setProperty(property);
    handler->setTargetScaleMultiplier(targetScaleMultiplier);
    handler->setTargetTransformAroundCursor(targetTransformAroundCursor);
    QSignalSpy activeChangedSpy(handler, SIGNAL(activeChanged()));

    if (eventPhases) {
        sendWheelEvent(window, eventPos, QPoint(), QPoint(), eventModifiers, Qt::ScrollBegin, eventInverted);
        sendWheelEvent(window, eventPos, eventAngleDelta, eventPixelDelta, eventModifiers, Qt::ScrollUpdate, eventInverted);
    } else {
        sendWheelEvent(window, eventPos, eventAngleDelta, eventPixelDelta, eventModifiers, Qt::NoScrollPhase, eventInverted);
    }
    QCOMPARE(rect->position().toPoint(), expectedPosition);
    QCOMPARE(activeChangedSpy.size(), 1);
    QCOMPARE(handler->active(), true);
    QCOMPARE(rect->scale(), expectedScale);
    QCOMPARE(rect->rotation(), expectedRotation);
    if (!eventPhases) {
        QTRY_COMPARE(handler->active(), false);
        QCOMPARE(activeChangedSpy.size(), 2);
    }

    // restore by rotating backwards
    if (eventPhases) {
        sendWheelEvent(window, eventPos, eventAngleDelta * -1, eventPixelDelta * -1, eventModifiers, Qt::ScrollUpdate, eventInverted);
        sendWheelEvent(window, eventPos, QPoint(), QPoint(), eventModifiers, Qt::ScrollEnd, eventInverted);
    } else {
        sendWheelEvent(window, eventPos, eventAngleDelta * -1, eventPixelDelta * -1, eventModifiers, Qt::NoScrollPhase, eventInverted);
    }
    QCOMPARE(activeChangedSpy.size(), eventPhases ? 2 : 3);
    QCOMPARE(handler->active(), !eventPhases);
    QCOMPARE(rect->position().toPoint(), QPoint(0, 0));
    QCOMPARE(rect->scale(), 1);
    QCOMPARE(rect->rotation(), 0);
}

void tst_QQuickWheelHandler::nestedHandler_data()
{
    // handler properties
    QTest::addColumn<Qt::Orientation>("orientation");
    QTest::addColumn<bool>("invertible");
    QTest::addColumn<int>("rotationScale");
    QTest::addColumn<QString>("property");
    QTest::addColumn<qreal>("targetScaleMultiplier");
    QTest::addColumn<bool>("targetTransformAroundCursor");
    // event
    QTest::addColumn<QPoint>("eventPos");
    QTest::addColumn<QPoint>("eventAngleDelta");
    QTest::addColumn<QPoint>("eventPixelDelta");
    QTest::addColumn<Qt::KeyboardModifiers>("eventModifiers");
    QTest::addColumn<bool>("eventPhases");
    QTest::addColumn<bool>("eventInverted");
    QTest::addColumn<int>("eventCount");
    // result: inner handler
    QTest::addColumn<QPoint>("innerPosition");
    QTest::addColumn<qreal>("innerScale");
    QTest::addColumn<int>("innerRotation");
    // result: outer handler
    QTest::addColumn<QPoint>("outerPosition");
    QTest::addColumn<qreal>("outerScale");
    QTest::addColumn<int>("outerRotation");

    // move the item
    QTest::newRow("vertical wheel angle delta to adjust x")
            << Qt::Vertical << false << 1 << "x" << 1.5 << true
            << QPoint(160, 120) << QPoint(120, 120) << QPoint() << Qt::KeyboardModifiers(Qt::NoModifier) << false << false << 10
            << QPoint(175,60) << 1.0 << 0
            << QPoint(75, 0) << 1.0 << 0;
    QTest::newRow("horizontal wheel pixel delta to adjust y")
            << Qt::Horizontal << false << 1 << "y" << 1.5 << false
            << QPoint(160, 120) << QPoint(120, 120) << QPoint(50, 50) << Qt::KeyboardModifiers(Qt::NoModifier) << true << false << 4
            << QPoint(100, 160) << 1.0 << 0
            << QPoint(0, 100) << 1.0 << 0;
}

void tst_QQuickWheelHandler::nestedHandler()
{
    // handler properties
    QFETCH(Qt::Orientation, orientation);
    QFETCH(bool, invertible);
    QFETCH(int, rotationScale);
    QFETCH(QString, property);
    QFETCH(qreal, targetScaleMultiplier);
    QFETCH(bool, targetTransformAroundCursor);
    // event
    QFETCH(QPoint, eventPos);
    QFETCH(QPoint, eventAngleDelta);
    QFETCH(QPoint, eventPixelDelta);
    QFETCH(Qt::KeyboardModifiers, eventModifiers);
    QFETCH(bool, eventPhases);
    QFETCH(bool, eventInverted);
    QFETCH(int, eventCount);
    // result: inner handler
    QFETCH(QPoint, innerPosition);
    QFETCH(qreal, innerScale);
    QFETCH(int, innerRotation);
    // result: outer handler
    QFETCH(QPoint, outerPosition);
    QFETCH(qreal, outerScale);
    QFETCH(int, outerRotation);

    QQuickView window;
    QByteArray errorMessage;
    QVERIFY2(QQuickTest::initView(window, testFileUrl("nested.qml"), true, &errorMessage), errorMessage.constData());
    window.show();
    QVERIFY(QTest::qWaitForWindowExposed(&window));

    QQuickItem *outerRect = window.rootObject();
    QVERIFY(outerRect != nullptr);
    QQuickWheelHandler *outerHandler = outerRect->findChild<QQuickWheelHandler*>("outerWheelHandler");
    QVERIFY(outerHandler != nullptr);
    QQuickWheelHandler *innerHandler = outerRect->findChild<QQuickWheelHandler*>("innerWheelHandler");
    QVERIFY(innerHandler != nullptr);
    QQuickItem *innerRect = innerHandler->parentItem();
    QVERIFY(innerRect != nullptr);
    innerHandler->setOrientation(orientation);
    innerHandler->setInvertible(invertible);
    innerHandler->setRotationScale(rotationScale);
    innerHandler->setProperty(property);
    innerHandler->setTargetScaleMultiplier(targetScaleMultiplier);
    innerHandler->setTargetTransformAroundCursor(targetTransformAroundCursor);
    outerHandler->setOrientation(orientation);
    outerHandler->setInvertible(invertible);
    outerHandler->setRotationScale(rotationScale);
    outerHandler->setProperty(property);
    outerHandler->setTargetScaleMultiplier(targetScaleMultiplier);
    outerHandler->setTargetTransformAroundCursor(targetTransformAroundCursor);
    QSignalSpy innerActiveChangedSpy(innerHandler, SIGNAL(activeChanged()));
    QSignalSpy outerActiveChangedSpy(outerHandler, SIGNAL(activeChanged()));

    if (eventPhases)
        sendWheelEvent(window, eventPos, QPoint(), QPoint(), eventModifiers, Qt::ScrollBegin, eventInverted);
    for (int i = 0; i < eventCount; ++i)
        sendWheelEvent(window, eventPos, eventAngleDelta, eventPixelDelta, eventModifiers,
                       (eventPhases ? Qt::ScrollUpdate : Qt::NoScrollPhase), eventInverted);
    QCOMPARE(innerRect->position().toPoint(), innerPosition);

    /*
        If outer is activated, maybe inner should be deactivated? But the event
        doesn't get delivered to inner anymore, so it doesn't find out that
        it's no longer getting events. It will get deactivated after the
        timeout, just as if the user stopped scrolling.

        This situation is similar to QTBUG-50199, but it's questionable whether
        that was really so important. So far in Qt Quick, if you move the mouse
        while wheel momentum continues, or if the item moves out from under the
        mouse, a different item starts getting the events immediately. In
        non-Qt applications on most OSes, that's quite normal.
    */
    // QCOMPARE(innerActiveChangedSpy.count(), 2);
    // QCOMPARE(innerHandler->active(), false);
    QCOMPARE(innerRect->scale(), innerScale);
    QCOMPARE(innerRect->rotation(), innerRotation);
    QCOMPARE(outerRect->position().toPoint(), outerPosition);
    QCOMPARE(outerActiveChangedSpy.size(), 1);
    QCOMPARE(outerHandler->active(), true);
    QCOMPARE(outerRect->scale(), outerScale);
    QCOMPARE(outerRect->rotation(), outerRotation);
    if (!eventPhases) {
        QTRY_COMPARE(outerHandler->active(), false);
        QCOMPARE(outerActiveChangedSpy.size(), 2);
    }
}

void tst_QQuickWheelHandler::blocking_data()
{
    // handler properties
    QTest::addColumn<bool>("blocking");

    // move the item
    QTest::newRow("default: blocking") << true;
    QTest::newRow("nonblocking") << false;
}

void tst_QQuickWheelHandler::blocking()
{
    QFETCH(bool, blocking);

    QQuickView window;
    QByteArray errorMessage;
    QVERIFY2(QQuickTest::initView(window, testFileUrl("nested.qml"), true, &errorMessage), errorMessage.constData());
    window.show();
    QVERIFY(QTest::qWaitForWindowExposed(&window));

    QQuickItem *outerRect = window.rootObject();
    QVERIFY(outerRect != nullptr);
    QQuickWheelHandler *outerHandler = outerRect->findChild<QQuickWheelHandler*>("outerWheelHandler");
    QVERIFY(outerHandler != nullptr);
    QQuickWheelHandler *innerHandler = outerRect->findChild<QQuickWheelHandler*>("innerWheelHandler");
    QVERIFY(innerHandler != nullptr);
    QQuickItem *innerRect = innerHandler->parentItem();
    QVERIFY(innerRect != nullptr);
    QPoint eventPos = innerRect->mapToScene(innerRect->boundingRect().center()).toPoint();

    QCOMPARE(innerHandler->isBlocking(), true); // default property value
    innerHandler->setBlocking(blocking);
    QSignalSpy innerActiveChangedSpy(innerHandler, SIGNAL(activeChanged()));
    QSignalSpy outerActiveChangedSpy(outerHandler, SIGNAL(activeChanged()));

    qreal innerPosWas = innerRect->position().x();
    qreal outerPosWas = outerRect->position().x();

    sendWheelEvent(window, eventPos, {0, 120}, {0, 0}, Qt::NoModifier, Qt::NoScrollPhase, false);
    QTRY_COMPARE(innerActiveChangedSpy.size(), 2);
    QCOMPARE(innerRect->position().x(), innerPosWas + 15);
    QCOMPARE(outerActiveChangedSpy.size(), blocking ? 0 : 2);
    QCOMPARE(outerRect->position().x(), outerPosWas + (blocking ? 0 : 15));
}

QTEST_MAIN(tst_QQuickWheelHandler)

#include "tst_qquickwheelhandler.moc"