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#ifndef QT3DRENDER_RENDER_SHADERDATA_P_H
#define QT3DRENDER_RENDER_SHADERDATA_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 <Qt3DRender/private/backendnode_p.h>
#include <Qt3DRender/private/shadervariables_p.h>
#include <Qt3DRender/qshaderdata.h>
#include <QMutex>
#include <QMatrix4x4>

QT_BEGIN_NAMESPACE

namespace Qt3DRender {

namespace Render {

class GraphicsContext;
class GLBuffer;
class NodeManagers;

class Q_AUTOTEST_EXPORT ShaderData : public BackendNode
{
public:
    enum TransformType {
        ModelToEye = 0,
        ModelToWorld
    };

    ShaderData();
    ~ShaderData();

    QHash<QString, QVariant> properties() const { return m_properties; }
    QHash<QString, QVariant> updatedProperties() const { return m_updatedProperties; }

    // Called by FramePreparationJob
    bool updateWorldTransform(const QMatrix4x4 &worldMatrix);

    // Call by RenderViewJob
    void markDirty();
    bool updateViewTransform(const QMatrix4x4 &viewMatrix);

    // Called by FrameCleanupJob
    static void cleanup(NodeManagers *managers);

    void setManagers(NodeManagers *managers);

protected:
    void initializeFromPeer(const Qt3DCore::QNodeCreatedChangeBasePtr &change) Q_DECL_OVERRIDE;
    void sceneChangeEvent(const Qt3DCore::QSceneChangePtr &e) Q_DECL_OVERRIDE;

    // 1 to 1 match with frontend properties, modified only by sceneChangeEvent
    QHash<QString, QVariant> m_originalProperties;
    // 1 to 1 match with frontend properties apart from Transformed
    // properties which contain the matrices product
    QHash<QString, QVariant> m_properties;
    // only updated properties, Transformed properties have the same
    // value as in m_properties
    QHash<QString, QVariant> m_updatedProperties;
    PropertyReaderInterfacePtr m_propertyReader;
    QHash<QString, QVariant> m_nestedShaderDataProperties;
    QHash<QString, TransformType> m_transformedProperties;
    QMutex m_mutex;
    static QVector<Qt3DCore::QNodeId> m_updatedShaderData;
    QMatrix4x4 m_worldMatrix;
    QMatrix4x4 m_viewMatrix;
    NodeManagers *m_managers;

    void readPeerProperties(QShaderData *peer);
    void clearUpdatedProperties();
    static ShaderData *lookupResource(NodeManagers *managers, Qt3DCore::QNodeId id);
    ShaderData *lookupResource(Qt3DCore::QNodeId id);

    friend class RenderShaderDataFunctor;
};

class RenderShaderDataFunctor : public Qt3DCore::QBackendNodeMapper
{
public:
    explicit RenderShaderDataFunctor(AbstractRenderer *renderer, NodeManagers *managers);

    Qt3DCore::QBackendNode *create(const Qt3DCore::QNodeCreatedChangeBasePtr &change) const Q_DECL_FINAL;
    Qt3DCore::QBackendNode *get(Qt3DCore::QNodeId id) const Q_DECL_FINAL;
    void destroy(Qt3DCore::QNodeId id) const Q_DECL_FINAL;

private:
    NodeManagers *m_managers;
    AbstractRenderer *m_renderer;
};

} // namespace Render

} // namespace Qt3DRender

QT_END_NAMESPACE

Q_DECLARE_METATYPE(Qt3DRender::Render::ShaderData*)

#endif // QT3DRENDER_RENDER_SHADERDATA_P_H
