/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: http://www.qt-project.org/legal
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** This file is part of the Qt3D module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL3$
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
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****************************************************************************/

#ifndef QT3D_QNODE_P_H
#define QT3D_QNODE_P_H

#include <private/qobject_p.h>
#include <Qt3DCore/qt3dcore_global.h>
#include <Qt3DCore/qnode.h>
#include <Qt3DCore/private/qobservableinterface_p.h>
#include <Qt3DCore/private/qchangearbiter_p.h>
#include "propertychangehandler_p.h"

QT_BEGIN_NAMESPACE

namespace Qt3D {

class QNode;
class QAspectEngine;

class QT3DCORESHARED_EXPORT QNodePrivate : public QObjectPrivate, public QObservableInterface
{
public:
    QNodePrivate();

    void setScene(QSceneInterface *scene);
    QSceneInterface *scene() const;

    void setArbiter(QLockableObserverInterface *arbiter) Q_DECL_OVERRIDE;

    void notifyPropertyChange(const char *name, const QVariant &value);
    void notifyObservers(const QSceneChangePtr &change) Q_DECL_OVERRIDE;

    void insertTree(QNode *treeRoot, int depth = 0);

    Q_DECLARE_PUBLIC(QNode)

    // For now this just protects access to the m_changeArbiter.
    // Later on we may decide to extend support for multiple observers.
    QLockableObserverInterface *m_changeArbiter;
    QSceneInterface *m_scene;
    mutable QNodeId m_id;
    bool m_blockNotifications;

    static QNodePrivate *get(QNode *q);
    static void nodePtrDeleter(QNode *q);

private:
    void addChild(QNode *childNode);
    void removeChild(QNode *childNode);
    void removeAllChildren();
    void registerNotifiedProperties();
    void unregisterNotifiedProperties();
    void propertyChanged(int propertyIndex);

    friend class PropertyChangeHandler<QNodePrivate>;
    bool m_propertyChangesSetup;
    PropertyChangeHandler<QNodePrivate> m_signals;

    static QHash<QNodeId, QNode *> m_clonesLookupTable;
};

} // namespace Qt3D

QT_END_NAMESPACE

#endif // QT3D_NODE_P_H