// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#ifndef QWASMSCREEN_H
#define QWASMSCREEN_H

#include "qwasmcursor.h"

#include "qwasmwindowtreenode.h"

#include <qpa/qplatformscreen.h>

#include <QtCore/qscopedpointer.h>
#include <QtCore/qtextstream.h>
#include <QtCore/private/qstdweb_p.h>

#include <emscripten/val.h>

QT_BEGIN_NAMESPACE

class QPlatformOpenGLContext;
class QWasmWindow;
class QWasmBackingStore;
class QWasmCompositor;
class QWasmDeadKeySupport;
class QOpenGLContext;

class QWasmScreen : public QObject, public QPlatformScreen, public QWasmWindowTreeNode
{
    Q_OBJECT
public:
    QWasmScreen(const emscripten::val &containerOrCanvas);
    ~QWasmScreen();
    void deleteScreen();

    static QWasmScreen *get(QPlatformScreen *screen);
    static QWasmScreen *get(QScreen *screen);
    emscripten::val element() const;
    QString eventTargetId() const;
    QString outerScreenId() const;
    QPointingDevice *touchDevice() { return m_touchDevice.get(); }
    QPointingDevice *tabletDevice() { return m_tabletDevice.get(); }

    QWasmCompositor *compositor();
    QWasmDeadKeySupport *deadKeySupport() { return m_deadKeySupport.get(); }

    QList<QWasmWindow *> allWindows();

    QRect geometry() const override;
    int depth() const override;
    QImage::Format format() const override;
    QDpi logicalDpi() const override;
    qreal devicePixelRatio() const override;
    QString name() const override;
    QPlatformCursor *cursor() const override;

    void resizeMaximizedWindows();
    QWindow *topWindow() const;
    QWindow *topLevelAt(const QPoint &p) const override;

    // QWasmWindowTreeNode:
    emscripten::val containerElement() final;
    QWasmWindowTreeNode *parentNode() final;

    QPointF mapFromLocal(const QPointF &p) const;
    QPointF clipPoint(const QPointF &p) const;

    void invalidateSize();
    void updateQScreenAndCanvasRenderSize();
    void installCanvasResizeObserver();
    static void canvasResizeObserverCallback(emscripten::val entries, emscripten::val);

public slots:
    void setGeometry(const QRect &rect);

private:
    // QWasmWindowTreeNode:
    void onSubtreeChanged(QWasmWindowTreeNodeChangeType changeType, QWasmWindowTreeNode *parent,
                          QWasmWindow *child) final;

    emscripten::val m_container;
    emscripten::val m_intermediateContainer;
    emscripten::val m_shadowContainer;
    std::unique_ptr<QWasmCompositor> m_compositor;
    std::unique_ptr<QPointingDevice> m_touchDevice;
    std::unique_ptr<QPointingDevice> m_tabletDevice;
    std::unique_ptr<QWasmDeadKeySupport> m_deadKeySupport;
    QRect m_geometry = QRect(0, 0, 100, 100);
    int m_depth = 32;
    QImage::Format m_format = QImage::Format_RGB32;
    QWasmCursor m_cursor;
    static const char *m_canvasResizeObserverCallbackContextPropertyName;
    std::unique_ptr<qstdweb::EventCallback> m_onContextMenu;
};

QT_END_NAMESPACE
#endif // QWASMSCREEN_H