/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2023                                                               *
 *                                                                                       *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
 * software and associated documentation files (the "Software"), to deal in the Software *
 * without restriction, including without limitation the rights to use, copy, modify,    *
 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to    *
 * permit persons to whom the Software is furnished to do so, subject to the following   *
 * conditions:                                                                           *
 *                                                                                       *
 * The above copyright notice and this permission notice shall be included in all copies *
 * or substantial portions of the Software.                                              *
 *                                                                                       *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,   *
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A         *
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT    *
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF  *
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE  *
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                                         *
 ****************************************************************************************/

#ifndef __OPENSPACE_MODULE_MULTIRESVOLUME___MULTIRESVOLUMERAYCASTER___H__
#define __OPENSPACE_MODULE_MULTIRESVOLUME___MULTIRESVOLUMERAYCASTER___H__

#include <openspace/rendering/volumeraycaster.h>

#include <openspace/util/boxgeometry.h>
#include <ghoul/glm.h>
#include <ghoul/opengl/bufferbinding.h>
#include <ghoul/opengl/textureunit.h>
#include <string>

namespace ghoul::opengl {
    class Texture;
    class ProgramObject;
} // namespace ghoul::opengl

namespace openspace {

class AtlasManager;
struct RenderData;
struct RaycastData;
class TSP;
class TransferFunction;

class MultiresVolumeRaycaster : public VolumeRaycaster {
public:
    MultiresVolumeRaycaster(std::shared_ptr<TSP> tsp,
        std::shared_ptr<AtlasManager> atlasManager,
        std::shared_ptr<TransferFunction> transferFunction);

    virtual ~MultiresVolumeRaycaster();

    void initialize();
    void deinitialize();
    void renderEntryPoints(const RenderData& data,
        ghoul::opengl::ProgramObject& program) override;
    void renderExitPoints(const RenderData& data,
        ghoul::opengl::ProgramObject& program) override;
    void preRaycast(const RaycastData& data,
        ghoul::opengl::ProgramObject& program) override;
    void postRaycast(const RaycastData& data,
        ghoul::opengl::ProgramObject& program) override;
    bool isCameraInside(const RenderData& data, glm::vec3& localPosition) override;

    std::string boundsVertexShaderPath() const override;
    std::string boundsFragmentShaderPath() const override;
    std::string raycasterPath() const override;
    std::string helperPath() const override;

    void setModelTransform(glm::mat4 transform);
    //void setTime(double time);
    void setStepSizeCoefficient(float coefficient);

private:
    BoxGeometry _boundingBox;
    glm::mat4 _modelTransform = glm::mat4(1.f);
    float _stepSizeCoefficient = 0.f;

    std::shared_ptr<TSP> _tsp;
    std::shared_ptr<AtlasManager> _atlasManager;
    std::shared_ptr<TransferFunction> _transferFunction;

    std::unique_ptr<ghoul::opengl::TextureUnit> _tfUnit;
    std::unique_ptr<ghoul::opengl::TextureUnit> _atlasUnit;
    std::unique_ptr<
        ghoul::opengl::BufferBinding<ghoul::opengl::bufferbinding::Buffer::ShaderStorage>
    > _atlasMapBinding;

}; // MultiresVolumeRaycaster

} // namespace openspace

#endif // __OPENSPACE_MODULE_MULTIRESVOLUME___MULTIRESVOLUMERAYCASTER___H__
