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* Visual and Computer Graphics Library                            o     o   *
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* Copyright(C) 2004-2016                                           \/)\/    *
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/*! \file trimesh_clustering.cpp
\ingroup code_sample

\brief a minimal example of a clustering based simplification

*/
#include<vcg/complex/complex.h>

#include <vcg/complex/algorithms/update/bounding.h>
#include <vcg/complex/algorithms/update/topology.h>
#include <vcg/complex/algorithms/update/normal.h>
#include <vcg/complex/algorithms/update/flag.h>
#include <vcg/complex/algorithms/clustering.h>

// input output
#include <wrap/io_trimesh/import.h>
#include <wrap/io_trimesh/export.h>

class MyFace;
class MyVertex;

struct MyUsedTypes : public vcg::UsedTypes<	vcg::Use<MyVertex>::AsVertexType,    vcg::Use<MyFace>::AsFaceType>{};

class MyVertex  : public vcg::Vertex< MyUsedTypes, vcg::vertex::Coord3f, vcg::vertex::Normal3f, vcg::vertex::BitFlags  >{};
class MyFace    : public vcg::Face < MyUsedTypes, vcg::face::VertexRef, vcg::face::Normal3f, vcg::face::BitFlags > {};
class MyMesh    : public vcg::tri::TriMesh< std::vector<MyVertex>, std::vector<MyFace> > {};

int  main(int argc, char **argv)
{
  if(argc<3)
  {
    printf(
          "Usage: trimesh_clustering filein.ply fileout.ply [opt] \n"
          "options: \n"
          "-k cellnum     approx number of cluster that should be defined; (default 10e5)\n"
          "-s size        in absolute units the size of the clustering cell (override the previous param)\n"
          "-d             enable the duplication of faces for double surfaces\n"
          );
    exit(0);
  }

  int CellNum=100000;
  float CellSize=0;
  bool DupFace=false;

  int i=3;
  while(i<argc)
  {
    if(argv[i][0]!='-')
    { printf("Error unable to parse option '%s'\n",argv[i]); exit(0); }
    switch(argv[i][1])
    {
    case 'k' :	CellNum=atoi(argv[i+1]); ++i; printf("Using %i clustering cells\n",CellNum); break;
    case 's' :	CellSize=atof(argv[i+1]); ++i; printf("Using %5f as clustering cell size\n",CellSize); break;
    case 'd' :	DupFace=true; printf("Enabling the duplication of faces for double surfaces\n"); break;

    default : {printf("Error unable to parse option '%s'\n",argv[i]); exit(0);}
    }
    ++i;
  }

  MyMesh m;
  if(vcg::tri::io::ImporterPLY<MyMesh>::Open(m,argv[1])!=0)
  {
    printf("Error reading file  %s\n",argv[1]);
    exit(0);
  }

  vcg::tri::UpdateBounding<MyMesh>::Box(m);
  vcg::tri::UpdateNormal<MyMesh>::PerFace(m);
  printf("Input mesh  vn:%i fn:%i\n",m.VN(),m.FN());
  vcg::tri::Clustering<MyMesh, vcg::tri::AverageColorCell<MyMesh> > Grid;
  Grid.DuplicateFaceParam=DupFace;
  Grid.Init(m.bbox,CellNum,CellSize);
  
  printf("Clustering to %i cells\n",Grid.Grid.siz[0]*Grid.Grid.siz[1]*Grid.Grid.siz[2] );
  printf("Grid of %i x %i x %i cells\n",Grid.Grid.siz[0],Grid.Grid.siz[1],Grid.Grid.siz[2]);
  printf("with cells size of %.2f x %.2f x %.2f units\n",Grid.Grid.voxel[0],Grid.Grid.voxel[1],Grid.Grid.voxel[2]);
  
  Grid.AddMesh(m);
  Grid.ExtractMesh(m);
  printf("Output mesh vn:%i fn:%i\n",m.VN(),m.FN());

  vcg::tri::io::ExporterPLY<MyMesh>::Save(m,argv[2]);
  return 0;
}