// Copyright (c) 2003-2007  INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v5.6.2/Surface_mesher/include/CGAL/Surface_mesh_cell_base_3.h $
// $Id: Surface_mesh_cell_base_3.h 07793738355 2020-03-26T13:31:46+01:00 Sébastien Loriot
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s)     : Steve Oudot, David Rey, Mariette Yvinec, Laurent Rineau, Andreas Fabri

#ifndef CGAL_SURFACE_MESH_CELL_BASE_3_H
#define CGAL_SURFACE_MESH_CELL_BASE_3_H

#include <CGAL/license/Surface_mesher.h>

#include <CGAL/Complex_2_in_triangulation_cell_base_3.h>
#include <CGAL/Delaunay_triangulation_cell_base_3.h>

#ifdef CGAL_MESH_3_IO_H
#include <string>
#endif

#ifdef CGAL_SURFACE_MESHER_TAG_BAD
#include <bitset>
#endif // CGAL_SURFACE_MESHER_TAG_BAD

namespace CGAL {

  template < class GT, class Cb = Delaunay_triangulation_cell_base_3<GT> >
  class Surface_mesh_cell_base_3 :
    public Complex_2_in_triangulation_cell_base_3<GT, Cb>
  {
    typedef Complex_2_in_triangulation_cell_base_3<GT, Cb> Base;
  public:
    typedef Surface_mesh_cell_base_3 <GT, Cb> Self;

    template < class TDS3 >
    struct Rebind_TDS {
      typedef typename Cb::template Rebind_TDS<TDS3>::Other  Cb3;
      typedef Surface_mesh_cell_base_3 <GT, Cb3> Other;
    };


    typedef typename GT::Point_3 Point;

    typedef typename Base::Triangulation_data_structure Tds;
    typedef typename Tds::Vertex_handle Vertex_handle;
    typedef typename Tds::Cell_handle Cell_handle;


  private:

    // -- fields added to this class --
    Point tab_surface_center_facets [4];
#ifdef CGAL_SURFACE_MESHER_TAG_BAD
    std::bitset<12> bits;
#else
    char bits; // the lower 4 bits for 'facet_visited',
               // the higher 4 bits for 'visits'
#endif

  public:

    // Constructors

    Surface_mesh_cell_base_3()
      : Base(), bits()// c_visited(0)
    {}

    Surface_mesh_cell_base_3 (Vertex_handle v0,
                              Vertex_handle v1,
                              Vertex_handle v2,
                              Vertex_handle v3)
      : Base (v0, v1, v2, v3), bits()// c_visited(0)
    {}

    Surface_mesh_cell_base_3 (Vertex_handle v0,
                              Vertex_handle v1,
                              Vertex_handle v2,
                              Vertex_handle v3,
                              Cell_handle n0,
                              Cell_handle n1,
                              Cell_handle n2,
                              Cell_handle n3)
      : Base (v0, v1, v2, v3, n0, n1, n2, n3), bits()// c_visited(0)
    {}



    // Access functions

    // Facets

    bool is_facet_visited (const int facet) const {
      CGAL_assertion (facet>=0 && facet <4);
#ifdef CGAL_SURFACE_MESHER_TAG_BAD
      return bits[facet];
#else
      return (bits & (1 << facet)) != 0;
#endif
    }

    bool visited (const int facet) const {
      CGAL_assertion (facet>=0 && facet <4);
#ifdef CGAL_SURFACE_MESHER_TAG_BAD
      return bits[facet+4];
#else
      return (bits & (1 << (facet+4))) != 0;
#endif
    }

    const Point& get_facet_surface_center(const int facet) const {
      CGAL_assertion (facet>=0 && facet <4);
      return(tab_surface_center_facets[facet]);
  }

    // Setting functions

    // Facets

    void set_facet_visited (const int facet) {
      CGAL_assertion (facet>=0 && facet <4);
#ifdef CGAL_SURFACE_MESHER_TAG_BAD
      bits[facet] = true;
#else
      bits |= (1 << facet);
#endif
    }

    void set_visited (const int facet) {
      CGAL_assertion (facet>=0 && facet <4);
#ifdef CGAL_SURFACE_MESHER_TAG_BAD
      bits[facet+4] = true;
#else
      bits |= (1 << (4+facet));
#endif
    }

#ifdef CGAL_SURFACE_MESHER_TAG_BAD
    void set_bad(const int facet) {
      bits[facet+8] = true;
    }

    bool is_bad(const int facet) const {
      return bits[facet+8];
    }
#endif

    void reset_visited (const int facet) {
      CGAL_assertion (facet>=0 && facet <4);
#ifdef CGAL_SURFACE_MESHER_TAG_BAD
      bits &= ~((1 | (1 << 4) | (1 << 8)) << facet);
//       bits[facet+8] = false;
//       bits[facet+4] = false;
//       bits[facet] = false;
#else
      bits &= (15 & ~(1 << facet));
      bits &= ((15 | (15<<4)) & ~(1 << (4+facet)));
#endif
    }

    void set_facet_surface_center(const int facet,
                          const Point& p) {
      CGAL_assertion (facet>=0 && facet <4);
      tab_surface_center_facets[facet]=p;
    }

#ifdef CGAL_MESH_3_IO_H
    static
    std::string io_signature()
    {
      return
        Get_io_signature<Complex_2_in_triangulation_cell_base_3<GT, Cb> >()();
    }
#endif
  };  // end Surface_mesh_cell_base_3

template < class GT, class Cb >
std::istream&
operator>>(std::istream &is,
           Surface_mesh_cell_base_3<GT, Cb> &v)
{
  return is >>
    static_cast<Complex_2_in_triangulation_cell_base_3<GT, Cb>&>(v);
}

template < class GT, class Cb >
std::ostream&
operator<<(std::ostream &os,
           const Surface_mesh_cell_base_3<GT, Cb> &v)
{
  return os <<
    static_cast<const Complex_2_in_triangulation_cell_base_3<GT, Cb>&>(v);
}

}  // namespace CGAL


#endif  // CGAL_SURFACE_MESH_CELL_BASE_3_H
