#include <Rcpp.h>
// Copyright (c) 2015  INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v5.6.1/Advancing_front_surface_reconstruction/include/CGAL/Advancing_front_surface_reconstruction/internal/write_triple_indices.h $
// $Id: write_triple_indices.h 98e4718 2021-08-26T11:33:39+02:00 Sébastien Loriot
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s)     : Frank Da, David Cohen-Steiner, Andreas Fabri

#ifndef CGAL_AFSR_WRITE_TRIPLE_INDICES_H
#define CGAL_AFSR_WRITE_TRIPLE_INDICES_H

#include <CGAL/license/Advancing_front_surface_reconstruction.h>


#include <CGAL/array.h>

namespace CGAL {

  template <class Triangulation, class Filter>
  class Advancing_front_surface_reconstruction;



  template <class OutputIterator, class Triangulation, class Filter>
  OutputIterator
  write_triple_indices(OutputIterator out, const Advancing_front_surface_reconstruction<Triangulation,Filter>& S)
  {
    typedef Advancing_front_surface_reconstruction<Triangulation,Filter> Surface;
    typedef typename Surface::TDS_2 TDS_2;
    typedef typename TDS_2::Face_iterator Face_iterator;

    if(S.triangulation_3().dimension() < 3){
      Rcpp::Rcerr << "not 3D\n";
      return out;
    }
    const TDS_2& tds = S.triangulation_data_structure_2();

    for(Face_iterator fit = tds.faces_begin(); fit != tds.faces_end(); ++fit){

      if(fit->is_on_surface()){
        *out++ = CGAL::make_array(fit->vertex(0)->vertex_3()->id(),
                                  fit->vertex(1)->vertex_3()->id(),
                                  fit->vertex(2)->vertex_3()->id());
      }
    }
    return out;
  }

}


#endif

