/*
   model/material.h
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#ifndef __INCLUDED_MODEL_MATERIAL_H__
#define __INCLUDED_MODEL_MATERIAL_H__

#include <string>
#include <map>

#include "math/color.h"
#include "math/vector2f.h"

namespace model
{

/// fragment surface material parameters
class Material
{
public:
	/// function pointer type for local functions
	typedef void(* LoaderFuncPtr)(Material *);

	/// surface flags
	enum SurfaceFlags { None = 0, Primary = 1, Secondary = 2, Tertiary = 3, Bright = 4, Engine = 8, Environment = 16, Texture = 32, Ignore = 64, Clip = 128, Origin = 256, Decal = 512 };

	/// type definition for the material registry
	typedef std::map<std::string, Material *> Registry;

	Material(const std::string &name);

	~Material();
	
	void print();

	/* ---- inspectors ----------------------------------------- */

	inline const std::string &name() const {
		return material_name;
	}

	inline const math::Color &color() const {
		return material_color;
	}

	inline const math::Color &specular() const {
		return material_specular;
	}

	inline const unsigned int flags() const {
		return material_flags;
	}

	inline const std::string &texture() const {
		return material_texture;
	}

	inline const size_t texture_id() const {
		return material_texture_id;
	}

	/**
	 * @brief returns the material texture size
	 */
	inline const math::Vector2f & size() const {
		return material_size;
	}

	/**
	 * @brief returns true if the material has the requested flag set
	 * */
	inline bool flag_is_set(const SurfaceFlags surfaceflag) const {
		return (((int) material_flags & surfaceflag) == surfaceflag);
	}
	
	/**
	 * @brief returns true if the material has the Ignore flag set
	 * @see flags()
	 * */
	inline bool ignore_is_set() const {
		return (flag_is_set(Ignore));
	}
	
	/**
	 * @brief returns true if the material has the Origin flag set
	 * @see flags()
	 * */
	inline bool origin_is_set() const {
		return (flag_is_set(Origin));
	}
		
	/* ---- mutators ------------------------------------------- */

	void set_color(const math::Color &color);
	void set_specular(const math::Color &specular);
	/**
	 * @brief set the material texture name
	 */
	void set_texture(const std::string &texture);

	/**
	 * @brief set the material texture id
	 */
	void set_texture_id(const size_t texture_id);

	/**
	 * @brief set the material texture size
	 */
	void set_size(const float width, const float height);

	/**
	 * @brief set the material texture size
	 */
	void set_size(const math::Vector2f &size);

	inline void set_flags(SurfaceFlags flags) {
		material_flags |= flags;
	}

	inline void unset_flags(SurfaceFlags flags) {
		material_flags &= ~flags;
	}

	/* ---- static ----------------------------------------------------- */

	/**
	 * @brief initialize material registry
	 * reads materials from the shader files listed in shaderlist.txt
	 */
	static void init();

	/**
	 * @brief shutdown material registry
	 */
	static void shutdown();

	/**
	 * @brief clear material registry
	 */
	static void clear();

	/**
	 * @brief print registered materials to the system console
	 */
	static void list();

	/**
	 * @brief add a material to the registry
	 */
	static void add(Material *material);

	/**
	 * @brief find a material in the registry
	 */
	static Material *find(const std::string &name);

	static void set_loader_func(LoaderFuncPtr func);

private:

	std::string		material_name;
	math::Color		material_color;
	math::Color		material_specular;
	unsigned int		material_flags;
	std::string		material_texture;
	size_t			material_texture_id;

	/// size of the material
	math::Vector2f		material_size;

	/// the materials registry
	static Registry		material_registry;

	static void load_shader(const std::string &shadername);

	static LoaderFuncPtr	material_loaderfunc;
};

}

#endif // __INCLUDED_MODEL_MATERIAL_H__