/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2021                                                               *
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#ifndef __OPENSPACE_MODULE_SPACE___RENDERABLEORBITALKEPLER___H__
#define __OPENSPACE_MODULE_SPACE___RENDERABLEORBITALKEPLER___H__

#include <openspace/rendering/renderable.h>

#include <modules/base/rendering/renderabletrail.h>
#include <modules/space/translation/keplertranslation.h>
#include <openspace/properties/stringproperty.h>
#include <openspace/properties/scalar/uintproperty.h>
#include <ghoul/glm.h>
#include <ghoul/misc/objectmanager.h>
#include <ghoul/opengl/programobject.h>

namespace openspace {

namespace documentation { struct Documentation; }

class RenderableOrbitalKepler : public Renderable {
public:
    RenderableOrbitalKepler(const ghoul::Dictionary& dictionary);

    void initializeGL() override;
    void deinitializeGL() override;

    bool isReady() const override;
    void render(const RenderData& data, RendererTasks& rendererTask) override;

    /**
        * Reads the provided data file and calls the KeplerTranslation::setKeplerElments
        * method with the correct values. If \p filename is a valid data file but contains
        * disallowed values (see KeplerTranslation::setKeplerElements), a
        * KeplerTranslation::RangeError is thrown.
        *
        * \param filename The path to the file that contains the data file.
        *
        * \throw ghoul::RuntimeError if the data file does not exist or there is a
        *        problem with its format.
        * \pre The \p filename must exist
        */
    virtual void readDataFile(const std::string& filename) = 0;

protected:
    static documentation::Documentation Documentation();

    double calculateSemiMajorAxis(double meanMotion) const;
    double epochFromSubstring(const std::string& epochString) const;
    double epochFromYMDdSubstring(const std::string& epochString);
    void updateBuffers();

    std::function<void()> _reinitializeTrailBuffers;
    std::function<void()> _updateStartRenderIdxSelect;
    std::function<void()> _updateRenderSizeSelect;

    struct KeplerParameters {
        double inclination = 0.0;
        double semiMajorAxis = 0.0;
        double ascendingNode = 0.0;
        double eccentricity = 0.0;
        double argumentOfPeriapsis = 0.0;
        double meanAnomaly = 0.0;
        double meanMotion = 0.0;
        double epoch = 0.0;
        double period = 0.0;
    };

    bool _updateDataBuffersAtNextRender = false;
    std::streamoff _numObjects;
    bool _isFileReadinitialized = false;
    inline static constexpr double convertAuToKm = 1.496e8;
    inline static constexpr double convertDaysToSecs = 86400.0;
    std::vector<KeplerParameters> _data;
    std::vector<size_t> _segmentSize;
    properties::UIntProperty _segmentQuality;
    properties::UIntProperty _startRenderIdx;
    properties::UIntProperty _sizeRender;
    properties::Property::OnChangeHandle _startRenderIdxCallbackHandle;
    properties::Property::OnChangeHandle _sizeRenderCallbackHandle;

private:
    struct Vertex {
        glm::vec3 position = glm::vec3(0.f);
        glm::vec3 color = glm::vec3(0.f);
        glm::vec2 texcoord = glm::vec2(0.f);
    };

    /// The layout of the VBOs
    struct TrailVBOLayout {
        float x = 0.f;
        float y = 0.f;
        float z = 0.f;
        float time = 0.f;
        double epoch = 0.0;
        double period = 0.0;
    };

    KeplerTranslation _keplerTranslator;

    /// The backend storage for the vertex buffer object containing all points for this
    /// trail.
    std::vector<TrailVBOLayout> _vertexBufferData;

    GLuint _vertexArray;
    GLuint _vertexBuffer;


    ghoul::opengl::ProgramObject* _programObject;
    properties::StringProperty _path;
    RenderableTrail::Appearance _appearance;
    glm::vec3 _position = glm::vec3(0.f);

    UniformCache(modelView, projection, lineFade, inGameTime, color, opacity,
        numberOfSegments) _uniformCache;
};

} // namespace openspace

#endif // __OPENSPACE_MODULE_SPACE___RENDERABLEORBITALKEPLER___H__