/****************************************************************************
* VCGLib                                                            o o     *
* Visual and Computer Graphics Library                            o     o   *
*                                                                _   O  _   *
* Copyright(C) 2004-2016                                           \/)\/    *
* Visual Computing Lab                                            /\/|      *
* ISTI - Italian National Research Council                           |      *
*                                                                    \      *
* All rights reserved.                                                      *
*                                                                           *
* This program is free software; you can redistribute it and/or modify      *   
* it under the terms of the GNU General Public License as published by      *
* the Free Software Foundation; either version 2 of the License, or         *
* (at your option) any later version.                                       *
*                                                                           *
* This program is distributed in the hope that it will be useful,           *
* but WITHOUT ANY WARRANTY; without even the implied warranty of            *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
* GNU General Public License (http://www.gnu.org/licenses/gpl.txt)          *
* for more details.                                                         *
*                                                                           *
****************************************************************************/

/****************************************************************************
  History
  
 $Log: not supported by cvs2svn $
 Revision 1.5  2008/02/27 00:34:43  cignoni
 corrected various bugs in the export of texture coords
 
 Revision 1.4  2007/06/20 10:28:04  tarini
 "newline at end of file" and  "endif" warnings fixed
 
 Revision 1.3  2006/11/09 07:51:44  cignoni
 bug due to wrong access to eventually unexistent FaceColor
 
 Revision 1.2  2006/10/09 19:58:08  cignoni
 Added casts to remove warnings
 
 Revision 1.1  2006/03/07 13:19:29  cignoni
 First Release with OBJ import support
 
 Revision 1.1  2006/02/16 19:28:36  fmazzant
 transfer of Export_3ds.h, Export_obj.h, Io_3ds_obj_material.h from Meshlab to vcg
 
 Revision 1.1  2006/02/06 11:04:40  fmazzant
 added file material.h. it include struct Material, CreateNewMaterial(...) and MaterialsCompare(...)
 
 
 ****************************************************************************/

#ifndef __VCGLIB_MATERIAL
#define __VCGLIB_MATERIAL

#include <string>
#include <vector>
#include <vcg/space/point3.h>

namespace vcg {
namespace tri {
namespace io {

/*
    structures material
  */
struct Material
{
  unsigned int index=-1;//index of material
  std::string materialName;
  
  Point3f Ka=Point3f(0.2f, 0.2f, 0.2f);//ambient
  Point3f Kd=Point3f(1.0f, 1.0f, 1.0f);//diffuse
  Point3f Ks=Point3f(1.0f, 1.0f, 1.0f);//specular
  
  //float d;//alpha - not used
  float Tr=0.0f;//alpha (for Tr, 0 means fully opaque)
  
  int illum=2;//specular illumination
  float Ns=0.f;
  
  std::string map_Kd; //filename texture
};


template <class SaveMeshType>
class Materials
{
public:
  typedef typename SaveMeshType::FaceType FaceType;
  typedef typename SaveMeshType::FaceIterator FaceIterator;
  typedef typename SaveMeshType::VertexIterator VertexIterator;
  typedef typename SaveMeshType::VertexType VertexType;
  
  /*
      creates a new meterial
    */
  inline static int CreateNewMaterial(const SaveMeshType &m, std::vector<Material> &materials, const FaceType& f)
  {
    Material mtl;

    if(HasPerFaceColor(m)){
      mtl.Kd = Point3f((float)(f.C()[0])/255.0f,(float)(f.C()[1])/255.0f,(float)(f.C()[2])/255.0f);//diffuse
      mtl.Tr = (float)(255-f.C()[3])/255.0f;//alpha
    }

    if(m.textures.size() && HasPerWedgeTexCoord(m) && f.WT(0).n() >=0 )
      mtl.map_Kd = m.textures[f.WT(0).n()];
    else
      mtl.map_Kd = "";

    int matInd = MaterialsCompare(materials,mtl);
    if(matInd == -1)
    {
      mtl.index = int(materials.size());
      materials.push_back(mtl);
      return mtl.index;
    }
    return matInd;
  }
  
  /*
      returns the index of the material if it exists inside the list of the materials, 
      otherwise it returns -1.
    */
  inline static int MaterialsCompare(std::vector<Material> &materials, Material mtl)
  {
    for(unsigned int i=0;i<materials.size();i++)
    {
      if(materials[i].Kd     != mtl.Kd    ) continue;
      if(materials[i].Ka     != mtl.Ka    ) continue;
      if(materials[i].Ks     != mtl.Ks    ) continue;
      if(materials[i].Tr     != mtl.Tr    ) continue;
      if(materials[i].illum  != mtl.illum ) continue;
      if(materials[i].Ns     != mtl.Ns    ) continue;
      if(materials[i].map_Kd != mtl.map_Kd) continue;
      return i;
    }
    return -1;
  }
};
}
}
}
#endif //__VCGLIB_MATERIAL
