/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2016                                                               *
 *                                                                                       *
 * 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 __RENDERABLESTARS_H__
#define __RENDERABLESTARS_H__

#include <openspace/rendering/renderable.h>
#include <openspace/properties/stringproperty.h>
#include <openspace/properties/optionproperty.h>
#include <openspace/properties/vectorproperty.h>

#include <ghoul/opengl/programobject.h>
#include <ghoul/opengl/texture.h>

namespace openspace {

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

	bool initialize() override;
	bool deinitialize() override;

	bool isReady() const override;

	void render(const RenderData& data) override;
	void update(const UpdateData& data) override;

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

	void createDataSlice(ColorOption option);

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

	properties::StringProperty _pointSpreadFunctionTexturePath;
    std::unique_ptr<ghoul::opengl::Texture> _pointSpreadFunctionTexture;
	bool _pointSpreadFunctionTextureIsDirty;

	properties::StringProperty _colorTexturePath;
    std::unique_ptr<ghoul::opengl::Texture> _colorTexture;
	bool _colorTextureIsDirty;

	properties::OptionProperty _colorOption;
	bool _dataIsDirty;

    properties::FloatProperty _scaleFactor;
    properties::FloatProperty _minBillboardSize;

	std::unique_ptr<ghoul::opengl::ProgramObject> _program;

	std::string _speckFile;

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

	GLuint _vao;
	GLuint _vbo;
};

} // namespace openspace

#endif  // __RENDERABLESTARS_H__