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#include <QtTest/QtTest>
#include <QQmlContext>
#include <QQuickView>
#include <QQuickItem>
#include <QPainter>
#include <qtwebengineglobal.h>
#include <private/qquickwebengineview_p.h>

class TestView : public QQuickView {
    Q_OBJECT
public:
    virtual void exposeEvent(QExposeEvent *e) Q_DECL_OVERRIDE {
        QQuickView::exposeEvent(e);
        emit exposeChanged();
    }

Q_SIGNALS:
    void exposeChanged();
};

class tst_QQuickWebEngineViewGraphics : public QObject
{
    Q_OBJECT
public:
    tst_QQuickWebEngineViewGraphics();
    virtual ~tst_QQuickWebEngineViewGraphics();

public Q_SLOTS:
    void initTestCase();
    void init();
    void cleanup();

private Q_SLOTS:
    void simpleGraphics();
    void renderMultipleTimes();
    void renderAfterNodeCleanup();
    void showHideShow();
    void simpleAcceleratedLayer();
    void reparentToOtherWindow();

private:
    void setHtml(const QString &html);
    QScopedPointer<TestView> m_view;
};

static const QString greenSquare("<div style=\"background-color: #00ff00; position:absolute; left:50px; top: 50px; width: 50px; height: 50px;\"></div>");
static const QString acLayerGreenSquare("<div style=\"background-color: #00ff00; position:absolute; left:50px; top: 50px; width: 50px; height: 50px; transform: translateZ(0); -webkit-transform: translateZ(0);\"></div>");

static QImage get150x150GreenReferenceImage()
{
    static QImage reference;
    if (reference.isNull()) {
        reference = QImage(150, 150, QImage::Format_RGB32);
        reference.fill(Qt::white);
        QPainter painter(&reference);
        painter.fillRect(50, 50, 50, 50, QColor("#00ff00"));
    }
    return reference;
}

static inline bool waitForSignal(QObject *obj, const char *signal, int timeout = 10000)
{
    QEventLoop loop;
    QObject::connect(obj, signal, &loop, SLOT(quit()));
    QTimer timer;
    QSignalSpy timeoutSpy(&timer, SIGNAL(timeout()));
    if (timeout > 0) {
        QObject::connect(&timer, SIGNAL(timeout()), &loop, SLOT(quit()));
        timer.setSingleShot(true);
        timer.start(timeout);
    }
    loop.exec();
    return timeoutSpy.isEmpty();
}

tst_QQuickWebEngineViewGraphics::tst_QQuickWebEngineViewGraphics()
{
}

tst_QQuickWebEngineViewGraphics::~tst_QQuickWebEngineViewGraphics()
{
}

// This will be called before the first test function is executed.
// It is only called once.
void tst_QQuickWebEngineViewGraphics::initTestCase()
{
    QWebEngine::initialize();
}

void tst_QQuickWebEngineViewGraphics::init()
{
    m_view.reset(new TestView);
}

void tst_QQuickWebEngineViewGraphics::cleanup()
{
}

void tst_QQuickWebEngineViewGraphics::simpleGraphics()
{
    setHtml(greenSquare);
    QCOMPARE(m_view->grabWindow(), get150x150GreenReferenceImage());
}

void tst_QQuickWebEngineViewGraphics::renderMultipleTimes()
{
    // This test is for loadVisuallyCommitted signal.
    // The setHtml() should not fail after multiple page load.
    setHtml(greenSquare);
    setHtml(greenSquare);
}

void tst_QQuickWebEngineViewGraphics::renderAfterNodeCleanup()
{
    setHtml(greenSquare);

    // Do it twice in a row, if the window isn't visible, the scene graph is going to be trashed by QQuickWindow::grabWindow after the first render.
    QVERIFY(!m_view->isVisible());
    QCOMPARE(m_view->grabWindow(), get150x150GreenReferenceImage());
    QCOMPARE(m_view->grabWindow(), get150x150GreenReferenceImage());
}

void tst_QQuickWebEngineViewGraphics::showHideShow()
{
    setHtml(greenSquare);
    QSignalSpy exposeSpy(m_view.data(), SIGNAL(exposeChanged()));
    m_view->show();
    QVERIFY(exposeSpy.wait(500));
    QCOMPARE(m_view->grabWindow(), get150x150GreenReferenceImage());

    m_view->hide();
    QVERIFY(exposeSpy.wait(500));
    m_view->show();
    QVERIFY(exposeSpy.wait(500));
    QCOMPARE(m_view->grabWindow(), get150x150GreenReferenceImage());
}

void tst_QQuickWebEngineViewGraphics::simpleAcceleratedLayer()
{
    setHtml(acLayerGreenSquare);
    QCOMPARE(m_view->grabWindow(), get150x150GreenReferenceImage());
}

void tst_QQuickWebEngineViewGraphics::reparentToOtherWindow()
{
    setHtml(greenSquare);
    QQuickWindow window;
    window.resize(m_view->size());
    window.create();

    m_view->rootObject()->setParentItem(window.contentItem());
    QCOMPARE(window.grabWindow(), get150x150GreenReferenceImage());
}

void tst_QQuickWebEngineViewGraphics::setHtml(const QString &html)
{
    QString htmlData = QUrl::toPercentEncoding(html);
    QString qmlData = QUrl::toPercentEncoding(QStringLiteral("import QtQuick 2.0; import QtWebEngine 0.9; WebEngineView { width: 150; height: 150; url: loadUrl }"));
    m_view->rootContext()->setContextProperty("loadUrl", QUrl(QStringLiteral("data:text/html,%1").arg(htmlData)));
    m_view->setSource(QUrl(QStringLiteral("data:text/plain,%1").arg(qmlData)));
    m_view->create();

    QQuickWebEngineView *webEngineView = static_cast<QQuickWebEngineView *>(m_view->rootObject());
    QVERIFY(waitForSignal(reinterpret_cast<QObject *>(webEngineView->experimental()), SIGNAL(loadVisuallyCommitted())));
    QCOMPARE(m_view->rootObject()->property("loading"), QVariant(false));
}

QTEST_MAIN(tst_QQuickWebEngineViewGraphics)
#include "tst_qquickwebengineviewgraphics.moc"