/*!
 * @file material.h
 * @brief Contains the Material Class that handles Material for 3D-Objects.
 * @todo free SDL-surface when deleting Material.
 * @todo delete imgNameWithPath after use creation.
 */

#ifndef _MATERIAL_H
#define _MATERIAL_H
#include "base_object.h"


#if HAVE_CONFIG_H
#include <config.h>
#endif /* HAVE_CONFIG_H */

#include <vector>
#include "texture.h"
#include "color.h"

// FORWARD DECLARATIONS //

//! Class to handle Materials.
class Material : public BaseObject
{
public:
  Material (const std::string& mtlName = "");
  virtual ~Material ();

  void loadParams(const TiXmlElement* root);

  Material& operator=(const Material& material);

  bool select () const;
  bool activateTextureUnit(unsigned int textureNumber);
  static void unselect();

  void setIllum (int illum);
  int getIllumModel() const { return this->illumModel; };

  void setDiffuse (float r, float g, float b);
  void setDiffuseColor(const Color& diffuseColor) { this->diffuse = diffuseColor; };
  void setAmbient (float r, float g, float b);
  void setSpecular (float r, float g, float b);
  void setShininess (float shini);
  void setTransparency (float trans);
  void setBlendFunc(GLenum sFactor, GLenum tFactor) { this->sFactor = sFactor; this->tFactor = tFactor; };
  void setBlendFuncS(const std::string& sFactor, const std::string& tFactor);

  Color& diffuseColor() { return diffuse; };
  const Color& diffuseColor() const { return diffuse; };

  // MAPPING //
  void setDiffuseMap(const Texture& texture, unsigned int textureNumber = 0);
  void setDiffuseMap(const std::string& dMap, GLenum target = GL_TEXTURE_2D, unsigned int textureNumber = 0);
  void setSDLDiffuseMap(SDL_Surface *surface, GLenum target = GL_TEXTURE_2D, unsigned int textureNumber = 0);
  void renderToTexture(unsigned int textureNumber, GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height);

  void setAmbientMap(const std::string& aMap, GLenum target = GL_TEXTURE_2D);
  void setSpecularMap(const std::string& sMap, GLenum target = GL_TEXTURE_2D);
  void setBump(const std::string& bump);

  GLuint diffuseTextureID(unsigned int i = 0) const { return (this->textures.size() > i)? this->textures[i].getTexture() : 0; };

  const Texture& diffuseTexture(unsigned int i = 0) const { return this->textures[i]; };

  static void addTexturePath(const std::string& pathName);

  const std::string& blendFuncToString(GLenum blendFunc);
  GLenum stringToBlendFunc(const std::string& blendFuncString);


public:
  static const GLenum glTextureArbs[];  //!< The Texture ARB's

  static const GLenum glBlendFuncParams[];
  static const std::string blendFuncNames[];

  static unsigned int getMaxTextureUnits();

private:
  static const Material* selectedMaterial; //!< The currently selected material.

  int              illumModel;       //!< The IlluminationModel is either flat or smooth.
  Color            diffuse;          //!< The diffuse color of the Material. (also transparency.)
  Color            ambient;          //!< The ambient color of the Material.
  Color            specular;         //!< The specular color of the Material.
  float            shininess;        //!< The shininess of the Material.
  GLenum           sFactor;          //!< The Blending Factor for the Source.
  GLenum           tFactor;          //!< The Blending Factor for the Destination.

  std::vector<Texture> textures;     //!< An Array of Textures.

  Texture*         ambientTexture;   //!< The ambient texture of the Material.
  Texture*         specularTexture;  //!< The specular texture of the Material.
};

#endif