// Copyright (c) 1997-2002  Max-Planck-Institute Saarbruecken (Germany).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.0.1/Nef_3/include/CGAL/Nef_3/Halfedge.h $
// $Id: include/CGAL/Nef_3/Halfedge.h 50cfbde3b84 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s)     : Michael Seel        <seel@mpi-sb.mpg.de>
//                 Miguel Granados     <granados@mpi-sb.mpg.de>
//                 Susan Hert          <hert@mpi-sb.mpg.de>
//                 Lutz Kettner        <kettner@mpi-sb.mpg.de>
//                 Peter Hachenberger  <hachenberger@mpi-sb.mpg.de>
#ifndef CGAL_NEF_HALFEDGE_H
#define CGAL_NEF_HALFEDGE_H

#include <CGAL/license/Nef_3.h>


#include <string>
#include <sstream>
#include <CGAL/IO/io.h>
#include <CGAL/IO/Verbose_ostream.h>
#include <CGAL/Nef_3/SNC_iteration.h>
#include <CGAL/Origin.h>

#undef CGAL_NEF_DEBUG
#define CGAL_NEF_DEBUG 83
#include <CGAL/Nef_2/debug.h>

#ifndef CGAL_I_DO_WANT_TO_USE_GENINFO
#include <any>
#endif

namespace CGAL {

template <typename Refs>
class Halfedge_base
{ // == Halfedge
  #ifdef CGAL_I_DO_WANT_TO_USE_GENINFO
  typedef void* GenPtr;
  #else
  typedef std::any GenPtr;
  #endif
  typedef typename Refs::Mark  Mark;
  typedef typename Refs::Vector_3  Vector_3;
  typedef typename Refs::Sphere_point  Sphere_point;
  typedef typename Refs::Vertex_handle    Vertex_handle;
  typedef typename Refs::Halfedge_handle  Halfedge_handle;
  typedef typename Refs::SVertex_handle   SVertex_handle;
  typedef typename Refs::SHalfedge_handle SHalfedge_handle;
  typedef typename Refs::SFace_handle     SFace_handle;
  typedef typename Refs::Vertex_const_handle    Vertex_const_handle;
  typedef typename Refs::Halfedge_const_handle  Halfedge_const_handle;
  typedef typename Refs::SVertex_const_handle   SVertex_const_handle;
  typedef typename Refs::SHalfedge_const_handle SHalfedge_const_handle;
  typedef typename Refs::SFace_const_handle     SFace_const_handle;

  Vertex_handle      center_vertex_;
  Mark               mark_;
  SVertex_handle     twin_;
  SHalfedge_handle   out_sedge_;
  SFace_handle       incident_sface_;
  GenPtr             info_;
  Sphere_point       point_;

 public:

  Halfedge_base() : center_vertex_(), mark_(), twin_(),
    out_sedge_(), incident_sface_(),
    info_(), point_() {}

    Halfedge_base(Mark m) :  center_vertex_(), mark_(m), twin_(),
      out_sedge_(), incident_sface_(),
      info_(), point_() {}

      ~Halfedge_base() {
        CGAL_NEF_TRACEN("  destroying Halfedge item "<<&*this);
      }

      Halfedge_base(const Halfedge_base<Refs>& e)
        { center_vertex_ = e.center_vertex_;
          point_ = e.point_;
          mark_ = e.mark_;
          twin_ = e.twin_;
          out_sedge_ = e.out_sedge_;
          incident_sface_ = e.incident_sface_;
          info_ = 0;
        }

      Halfedge_base<Refs>& operator=(const Halfedge_base<Refs>& e)
        { center_vertex_ = e.center_vertex_;
          point_ = e.point_;
          mark_ = e.mark_;
          twin_ = e.twin_;
          out_sedge_ = e.out_sedge_;
          incident_sface_ = e.incident_sface_;
          info_ = 0;
          return *this;
        }

      Halfedge_base<Refs>& operator=(Halfedge_base<Refs>&& e) noexcept
        { center_vertex_ = std::move(e.center_vertex_);
          point_ = std::move(e.point_);
          mark_ = std::move(e.mark_);
          twin_ = std::move(e.twin_);
          out_sedge_ = std::move(e.out_sedge_);
          incident_sface_ = std::move(e.incident_sface_);
          info_ = 0;
          return *this;
        }

      Vertex_handle& center_vertex() { return center_vertex_; }
      Vertex_const_handle center_vertex() const { return center_vertex_; }

      Vertex_handle& source() { return center_vertex_; }
      Vertex_const_handle source() const { return center_vertex_; }

      Vertex_handle& target() { return twin()->source(); }
      Vertex_const_handle target() const { return twin()->source(); }

      Mark& mark() { return mark_; }
      const Mark& mark() const { return mark_; }

      Vector_3 vector() const { return (point_ - CGAL::ORIGIN); }
      Sphere_point& point(){ return point_; }
      const Sphere_point& point() const { return point_; }

      SVertex_handle& twin() { return twin_; }
      SVertex_const_handle twin()  const { return twin_; }

      SHalfedge_handle& out_sedge() { return out_sedge_; }
      SHalfedge_const_handle out_sedge() const { return out_sedge_; }

      SFace_handle& incident_sface() { return incident_sface_; }
      SFace_const_handle incident_sface() const { return incident_sface_; }

      bool is_isolated() const { return (out_sedge() == SHalfedge_handle()); }

      GenPtr& info() { return info_; }
      const GenPtr& info() const { return info_; }

 public:
      std::string debug() const
        { std::stringstream os;
          CGAL::IO::set_pretty_mode(os);
          os<<"sv [ "<<point_
    #ifdef CGAL_I_DO_WANT_TO_USE_GENINFO
      <<info_
    #endif
      <<" ] ";
          return os.str();
        }

      bool is_twin() const { return (&*twin_ < this); }

      bool is_valid( bool verb = false, int level = 0) const {

        Verbose_ostream verr(verb);
        verr << "begin CGAL::SNC_items<...>::Halfedge_base::is_valid( verb=true, "
          "level = " << level << "):" << std::endl;

        bool valid = (center_vertex_ != nullptr && center_vertex_ != Vertex_handle());
        valid = valid && (twin_ != nullptr && twin_ != SVertex_handle() &&
                          twin_ != SVertex_handle());
        //      valid = valid && (out_sedge_ != nullptr);
        //      valid = valid && (incident_sface_ != SFace_handle());

        //      valid = valid &&((out_sedge_ != nullptr && incident_sface_ == nullptr) ||
        //                       (out_sedge_ == nullptr && incident_sface_ != nullptr));

        valid = valid && (out_sedge_ != nullptr || incident_sface_ != nullptr);

        verr << "end of CGAL::SNC_items<...>::Halfedge_base::is_valid(): structure is "
             << ( valid ? "valid." : "NOT VALID.") << std::endl;

        return valid;
      }

}; // Halfedge_base

} //namespace CGAL
#endif //CGAL_NEF_HALFEDGE_H

