/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
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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 (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
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****************************************************************************/

#ifndef QT3DCORE_QSCENE_P_H
#define QT3DCORE_QSCENE_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of other Qt classes.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/QScopedPointer>

#include <Qt3DCore/qnode.h>
#include <Qt3DCore/private/qabstractfrontendnodemanager_p.h>
#include <QtCore/qscopedpointer.h>
#include <Qt3DCore/private/qt3dcore_global_p.h>

QT_BEGIN_NAMESPACE

namespace Qt3DCore {

class QScenePrivate;
class QAspectEngine;
class NodePostConstructorInit;
class QChangeArbiter;

class Q_3DCORE_PRIVATE_EXPORT QScene : public QAbstractFrontEndNodeManager
{
public:
    // Changes made to backend nodes are reported to the Renderer
    enum DirtyNodeFlag {
        TransformDirty      = 1 << 0,
        GeometryDirty       = 1 << 1,
        EntityEnabledDirty  = 1 << 2,
        BuffersDirty        = 1 << 3,
        AllDirty            = 0xffffff
    };
    Q_DECLARE_FLAGS(DirtyNodeSet, DirtyNodeFlag)

    QScene(QAspectEngine *engine = nullptr);
    ~QScene();

    QAspectEngine *engine() const;

    void addObservable(QNode *observable);
    void removeObservable(QNode *observable);

    QNode *lookupNode(QNodeId id) const override;
    QList<QNode *> lookupNodes(const QList<QNodeId> &ids) const override;

    QNode *rootNode() const;

    void setArbiter(QChangeArbiter *arbiter);
    QChangeArbiter *arbiter() const;

    // Component -> Entities
    QList<QNodeId> entitiesForComponent(QNodeId id) const;
    void addEntityForComponent(QNodeId componentUuid, QNodeId entityUuid);
    void removeEntityForComponent(QNodeId componentUuid, QNodeId entityUuid);
    bool hasEntityForComponent(QNodeId componentUuid, QNodeId entityUuid);

    NodePostConstructorInit* postConstructorInit() const;

    void markDirty(DirtyNodeSet changes);
    DirtyNodeSet dirtyBits();
    void clearDirtyBits();

private:
    Q_DECLARE_PRIVATE(QScene)
    QScopedPointer<QScenePrivate> d_ptr;

    void setRootNode(QNode *root);
    friend class QAspectEnginePrivate;
};

} // Qt3D

QT_END_NAMESPACE

Q_DECLARE_METATYPE(Qt3DCore::QScene*) // LCOV_EXCL_LINE

#endif // QT3DCORE_QSCENE_P_H
