/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2019                                                               *
 *                                                                                       *
 * 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_SPACE___RENDERABLESTARS___H__
#define __OPENSPACE_MODULE_SPACE___RENDERABLESTARS___H__

#include <openspace/rendering/renderable.h>

#include <openspace/properties/stringproperty.h>
#include <openspace/properties/optionproperty.h>
#include <openspace/properties/scalar/floatproperty.h>
#include <openspace/properties/optionproperty.h>
#include <openspace/properties/propertyowner.h>
#include <openspace/properties/vector/vec2property.h>
#include <ghoul/opengl/ghoul_gl.h>
#include <ghoul/opengl/uniformcache.h>
#include <optional>

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

namespace openspace {

namespace documentation { struct Documentation; }

class RenderableStars : public Renderable {
public:
    explicit RenderableStars(const ghoul::Dictionary& dictionary);
    ~RenderableStars();

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

    bool isReady() const override;

    void renderPSFToTexture();
    void render(const RenderData& data, RendererTasks& rendererTask) override;
    void update(const UpdateData& data) override;

    static documentation::Documentation Documentation();

//private:
//    void loadShapeTexture();

private:
    enum ColorOption {
        Color     = 0,
        Velocity  = 1,
        Speed     = 2,
        OtherData = 3
    };

    static const int _psfTextureSize = 64;
    static const int _convolvedfTextureSize = 257;

    void createDataSlice(ColorOption option);

    void loadData();
    void readSpeckFile();
    bool loadCachedFile(const std::string& file);
    void saveCachedFile(const std::string& file) const;

    properties::StringProperty _speckFile;

    properties::StringProperty _colorTexturePath;
    std::unique_ptr<ghoul::opengl::Texture> _colorTexture;
    std::unique_ptr<ghoul::filesystem::File> _colorTextureFile;

    //properties::StringProperty _shapeTexturePath;
    //std::unique_ptr<ghoul::opengl::Texture> _shapeTexture;
    //std::unique_ptr<ghoul::filesystem::File> _shapeTextureFile;

    properties::OptionProperty _colorOption;
    properties::OptionProperty _otherDataOption;
    properties::StringProperty _otherDataColorMapPath;
    properties::Vec2Property _otherDataRange;
    std::unique_ptr<ghoul::opengl::Texture> _otherDataColorMapTexture;
    properties::BoolProperty _filterOutOfRange;
    properties::StringProperty _pointSpreadFunctionTexturePath;
    std::unique_ptr<ghoul::opengl::Texture> _pointSpreadFunctionTexture;
    std::unique_ptr<ghoul::filesystem::File> _pointSpreadFunctionFile;

    properties::FloatProperty _alphaValue;
    properties::OptionProperty _psfMethodOption;
    properties::OptionProperty _psfMultiplyOption;
    properties::FloatProperty _lumCent;
    properties::FloatProperty _radiusCent;
    properties::FloatProperty _brightnessCent;
    properties::FloatProperty _magnitudeExponent;
    properties::PropertyOwner _spencerPSFParamOwner;
    properties::FloatProperty _p0Param;
    properties::FloatProperty _p1Param;
    properties::FloatProperty _p2Param;
    properties::FloatProperty _spencerAlphaConst;
    properties::PropertyOwner _moffatPSFParamOwner;
    properties::FloatProperty _FWHMConst;
    properties::FloatProperty _moffatBetaConst;
    properties::OptionProperty _renderingMethodOption;
    properties::PropertyOwner _userProvidedTextureOwner;
    properties::PropertyOwner _parametersOwner;
    properties::PropertyOwner _moffatMethodOwner;
    properties::Vec2Property _fadeInDistance;
    properties::BoolProperty _disableFadeInDistance;

    std::unique_ptr<ghoul::opengl::ProgramObject> _program;
    UniformCache(
        modelMatrix, cameraUp, cameraViewProjectionMatrix,
        colorOption, magnitudeExponent, eyePosition, psfParamConf,
        lumCent, radiusCent, brightnessCent, colorTexture,
        alphaValue, psfTexture, otherDataTexture, otherDataRange,
        filterOutOfRange
    ) _uniformCache;

    bool _speckFileIsDirty = true;
    bool _pointSpreadFunctionTextureIsDirty = true;
    bool _colorTextureIsDirty = true;
    //bool _shapeTextureIsDirty = true;
    bool _dataIsDirty = true;
    bool _otherDataColorMapIsDirty = true;

    // Test Grid Enabled
    bool _enableTestGrid = false;

    std::vector<float> _slicedData;
    std::vector<float> _fullData;

    int _nValuesPerStar = 0;
    std::string _queuedOtherData;
    std::vector<std::string> _dataNames;

    std::optional<float> _staticFilterValue;
    float _staticFilterReplacementValue = 0.f;

    std::size_t _lumArrayPos = 0;
    std::size_t _absMagArrayPos = 0;
    std::size_t _appMagArrayPos = 0;
    std::size_t _bvColorArrayPos = 0;
    std::size_t _velocityArrayPos = 0;
    std::size_t _speedArrayPos = 0;

    GLuint _vao = 0;
    GLuint _vbo = 0;
    GLuint _psfVao = 0;
    GLuint _psfVbo = 0;
    GLuint _psfTexture = 0;
    GLuint _convolvedTexture = 0;
};

} // namespace openspace

#endif // __OPENSPACE_MODULE_SPACE___RENDERABLESTARS___H__