/****************************************************************************
* VCGLib                                                            o o     *
* Visual and Computer Graphics Library                            o     o   *
*                                                                _   O  _   *
* Copyright(C) 2004                                                \/)\/    *
* 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 $
****************************************************************************/
#ifndef __VCG_TRI_UPDATE_SELECTION
#define __VCG_TRI_UPDATE_SELECTION

namespace vcg {
namespace tri {

/** \addtogroup trimesh */
/*@{*/

/// Management, updating and computation of per-vertex and per-face normals.
/// This class is used to compute or update the normals that can be stored in the vertex or face component of a mesh.
template <class ComputeMeshType>
class UpdateSelection
{

public:
typedef ComputeMeshType MeshType; 
typedef typename MeshType::VertexType     VertexType;
typedef typename MeshType::VertexPointer  VertexPointer;
typedef typename MeshType::VertexIterator VertexIterator;
typedef typename MeshType::FaceType       FaceType;
typedef typename MeshType::FacePointer    FacePointer;
typedef typename MeshType::FaceIterator   FaceIterator;

/// 
static size_t AllVertex(MeshType &m)
{
	VertexIterator vi;
	for(vi = m.vert.begin(); vi != m.vert.end(); ++vi)
		if( !(*vi).IsD() )	(*vi).SetS();
  return m.vn;
}
  
static size_t AllFace(MeshType &m)
{
	FaceIterator fi;
	for(fi = m.face.begin(); fi != m.face.end(); ++fi)
    if( !(*fi).IsD() )	(*fi).SetS();
  return m.fn;  
}

static size_t ClearVertex(MeshType &m)
{
	VertexIterator vi;
	for(vi = m.vert.begin(); vi != m.vert.end(); ++vi)
		if( !(*vi).IsD() )	(*vi).ClearS();
  return 0;
}

static size_t ClearFace(MeshType &m)
{
	FaceIterator fi;
	for(fi = m.face.begin(); fi != m.face.end(); ++fi)
		if( !(*fi).IsD() )	(*fi).ClearS();
  return 0;
}

static void Clear(MeshType &m)
{
  ClearVertex(m);
  ClearFace(m);
}

static size_t CountFace(MeshType &m)
{
  size_t selCnt=0;
	FaceIterator fi;
  for(fi=m.face.begin();fi!=m.face.end();++fi)
    if(!(*fi).IsD() && (*fi).IsS()) ++selCnt;
  return selCnt;
}

static size_t CountVertex(MeshType &m)
{
  size_t selCnt=0;
	VertexIterator vi;
  for(vi=m.vert.begin();vi!=m.vert.end();++vi)
    if(!(*vi).IsD() && (*vi).IsS()) ++selCnt;
  return selCnt;
}

static size_t InvertFace(MeshType &m)
{
  size_t selCnt=0;
	FaceIterator fi;
  for(fi=m.face.begin();fi!=m.face.end();++fi)
      if(!(*fi).IsD()) 
      {
        if((*fi).IsS()) (*fi).ClearS(); 
        else {
          (*fi).SetS(); 
          ++selCnt;
        }
      }
  return selCnt;
} 

static size_t InvertVertex(MeshType &m)
{
  size_t selCnt=0;
	VertexIterator vi;
  for(vi=m.vert.begin();vi!=m.vert.end();++vi)
      if(!(*vi).IsD()) 
      {
        if((*vi).IsS()) (*vi).ClearS(); 
        else {
          (*vi).SetS(); 
          ++selCnt;
        }
      }
  return selCnt;
} 

// Select all the vertices that are touched by at least a single selected faces
static size_t VertexFromFaceLoose(MeshType &m)
{
  size_t selCnt=0;
	ClearVertex(m);
  FaceIterator fi;
	for(fi = m.face.begin(); fi != m.face.end(); ++fi)
		if( !(*fi).IsD() && (*fi).IsS())	
    {
      if( !(*fi).V(0)->IsS()) { (*fi).V(0)->SetS(); ++selCnt; }
      if( !(*fi).V(1)->IsS()) { (*fi).V(1)->SetS(); ++selCnt; }
      if( !(*fi).V(2)->IsS()) { (*fi).V(2)->SetS(); ++selCnt; }
    }
  return selCnt;
}

// Select ONLY the vertices that are touched ONLY by selected faces
static size_t VertexFromFaceStrict(MeshType &m)
{
  size_t selCnt=0;
	AllVertex(m);
  FaceIterator fi;
	for(fi = m.face.begin(); fi != m.face.end(); ++fi)
		if( !(*fi).IsD() && !(*fi).IsS())	
    {
     (*fi).V(0)->ClearS(); 
     (*fi).V(1)->ClearS(); 
     (*fi).V(2)->ClearS(); 
    }
  return CountVertex(m);
}

// Select ONLY the faces with ALL the vertices selected 
static size_t FaceFromVertexStrict(MeshType &m)
{
  size_t selCnt=0;
	ClearFace(m);
  FaceIterator fi;
	for(fi = m.face.begin(); fi != m.face.end(); ++fi)
		if( !(*fi).IsD())	
    {
      if((*fi).V(0)->IsS() && (*fi).V(1)->IsS() && (*fi).V(2)->IsS())
      { 
        (*fi).SetS();
        ++selCnt;
      }
    }
  return selCnt;
}

static size_t FaceFromVertexLoose(MeshType &m)
{
  size_t selCnt=0;
	ClearFace(m);
  FaceIterator fi;
	for(fi = m.face.begin(); fi != m.face.end(); ++fi)
		if( !(*fi).IsD() && !(*fi).IsS())	
    {
      if((*fi).V(0)->IsS() || (*fi).V(1)->IsS() || (*fi).V(2)->IsS())
      { 
        (*fi).SetS();
        ++selCnt;
      }
    }
  return selCnt;
}


}; // end class

}	// End namespace
}	// End namespace


#endif