// Copyright (c) 1997  ETH Zurich (Switzerland).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v5.1/Polyhedron_IO/include/CGAL/IO/generic_print_polyhedron.h $
// $Id: generic_print_polyhedron.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s)     : Lutz Kettner  <kettner@mpi-sb.mpg.de>

#ifndef CGAL_IO_GENERIC_PRINT_POLYHEDRON_H
#define CGAL_IO_GENERIC_PRINT_POLYHEDRON_H 1

#include <CGAL/license/Polyhedron.h>

#include <CGAL/boost/graph/Named_function_parameters.h>
#include <CGAL/boost/graph/named_params_helper.h>
#include <CGAL/property_map.h>
#include <boost/graph/graph_traits.hpp>

#include <CGAL/basic.h>
#include <CGAL/Inverse_index.h>
#include <iostream>

namespace CGAL {

template <class Polyhedron, class Writer, class Vpm>
void
generic_print_polyhedron( std::ostream&     out,
                          const Polyhedron& P,
                          Writer&           writer,
                          const Vpm& vpm ) {
    // writes P to `out' in the format provided by `writer'.
    typedef typename Polyhedron::Vertex_const_iterator                  VCI;
    typedef typename Polyhedron::Facet_const_iterator                   FCI;
    typedef typename Polyhedron::Halfedge_around_facet_const_circulator HFCC;
    // Print header.
    writer.write_header( out,
                         P.size_of_vertices(),
                         P.size_of_halfedges(),
                         P.size_of_facets());
    for(typename boost::graph_traits<Polyhedron>::vertex_descriptor vi : vertices(P)) {
        writer.write_vertex( ::CGAL::to_double( get(vpm, vi).x()),
                             ::CGAL::to_double( get(vpm, vi).y()),
                             ::CGAL::to_double( get(vpm, vi).z()));
    }
    typedef Inverse_index< VCI> Index;
    Index index( P.vertices_begin(), P.vertices_end());
    writer.write_facet_header();

    for( FCI fi = P.facets_begin(); fi != P.facets_end(); ++fi) {
        HFCC hc = fi->facet_begin();
        HFCC hc_end = hc;
        std::size_t n = circulator_size( hc);
        CGAL_assertion( n >= 3);
        writer.write_facet_begin( n);
        do {
            writer.write_facet_vertex_index( index[ VCI(hc->vertex())]);
            ++hc;
        } while( hc != hc_end);
        writer.write_facet_end();
    }
    writer.write_footer();
}

template <class Polyhedron, class Writer>
void
generic_print_polyhedron( std::ostream&     out,
                          const Polyhedron& P,
                          Writer&           writer)
{
  generic_print_polyhedron(out, P, writer,
                           get(CGAL::vertex_point, P));
}
} //namespace CGAL
#endif // CGAL_IO_GENERIC_PRINT_POLYHEDRON_H //
// EOF //