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#ifndef QT3DRENDER_RENDER_TEXTURE_H
#define QT3DRENDER_RENDER_TEXTURE_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/handle_types_p.h>
#include <Qt3DRender/qtexture.h>
#include <Qt3DRender/qtextureimagedata.h>
#include <Qt3DRender/qtexturegenerator.h>
#include <QOpenGLContext>
#include <QMutex>

QT_BEGIN_NAMESPACE

class QOpenGLTexture;

namespace Qt3DRender {

class QAbstractTexture;

namespace Render {

class TextureManager;
class TextureImageManager;
class TextureDataManager;

typedef quint64 TextureDNA;

class Texture : public BackendNode
{
public:
    Texture();
    ~Texture();
    void cleanup();

    QOpenGLTexture* getOrCreateGLTexture() ;

    GLint textureId();

    bool isTextureReset() const;

    void sceneChangeEvent(const Qt3DCore::QSceneChangePtr &e) Q_DECL_OVERRIDE;
    TextureDNA dna() const;

    void setTextureManager(TextureManager *manager);
    void setTextureImageManager(TextureImageManager *manager);
    void setTextureDataManager(TextureDataManager *manager);

    void updateAndLoadTextureImage();
    void addTextureImageData(HTextureImage handle);
    void removeTextureImageData(HTextureImage handle);

    void requestTextureDataUpdate();
    void addToPendingTextureJobs();
    void setTarget(QAbstractTexture::Target target);
    void setSize(int width, int height, int depth);
    void setFormat(QAbstractTexture::TextureFormat format);
    void setMipLevels(int mipmapLevels);
    void setLayers(int layers);

    inline QVector<HTextureImage> textureImages() const { return m_textureImages; }
    inline QAbstractTexture::TextureFormat format() const { return m_format; }
    inline QAbstractTexture::Target target() const { return m_target; }
    inline bool isAutoMipMapGenerationEnabled() const { return m_generateMipMaps; }

    inline QTextureGeneratorPtr dataGenerator() const { return m_dataFunctor; }
    void addTextureDataHandle(HTextureData handle);
    inline QVector<HTextureData> textureDataHandles() const { return m_textureDataHandles; }
    void releaseTextureDataHandles();

    inline bool dataUploadRequired() const { return m_dataUploadRequired; }
    inline bool isDirty() const { return m_isDirty; }

private:
    void initializeFromPeer(const Qt3DCore::QNodeCreatedChangeBasePtr &change) Q_DECL_FINAL;

    QOpenGLTexture *m_gl;

    QOpenGLTexture *buildGLTexture();
    void setToGLTexture(QTextureImageData *imgData);
    void setToGLTexture(TextureImage *rImg, QTextureImageData *imgData);
    void updateWrapAndFilters();

    int m_width;
    int m_height;
    int m_depth;
    int m_layers;
    int m_mipLevels;
    bool m_generateMipMaps;
    QAbstractTexture::Target m_target;
    QAbstractTexture::TextureFormat m_format;
    QAbstractTexture::Filter m_magnificationFilter;
    QAbstractTexture::Filter m_minificationFilter;
    QTextureWrapMode::WrapMode m_wrapModeX;
    QTextureWrapMode::WrapMode m_wrapModeY;
    QTextureWrapMode::WrapMode m_wrapModeZ;
    float m_maximumAnisotropy;
    QAbstractTexture::ComparisonFunction m_comparisonFunction;
    QAbstractTexture::ComparisonMode m_comparisonMode;

    QTextureGeneratorPtr m_dataFunctor;
    QVector<HTextureData> m_textureDataHandles;
    QVector<HTextureImage> m_textureImages;

    bool m_isDirty;
    bool m_filtersAndWrapUpdated;
    bool m_dataUploadRequired;

    mutable QMutex m_lock;
    TextureDNA m_textureDNA;
    TextureManager *m_textureManager;
    TextureImageManager *m_textureImageManager;
    TextureDataManager *m_textureDataManager;

    void updateDNA();
};

class TextureFunctor : public Qt3DCore::QBackendNodeMapper
{
public:
    explicit TextureFunctor(AbstractRenderer *renderer,
                            TextureManager *textureManager,
                            TextureImageManager *textureImageManager,
                            TextureDataManager *textureDataManager);
    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:
    AbstractRenderer *m_renderer;
    TextureManager *m_textureManager;
    TextureImageManager *m_textureImageManager;
    TextureDataManager *m_textureDataManager;
};

} // namespace Render
} // namespace Qt3DRender

QT_END_NAMESPACE

Q_DECLARE_METATYPE(Qt3DRender::Render::Texture*)

#endif // QT3DRENDER_RENDER_TEXTURE_H