// Copyright (c) 2009 INRIA Sophia-Antipolis (France).
// Copyright (c) 2011 GeometryFactory Sarl (France)
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
// You can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
// SPDX-License-Identifier: GPL-3.0+
//
// Author(s)     : Stéphane Tayeb, Andreas Fabri
//
//******************************************************************************
// File Description :
//
//
//******************************************************************************


#ifndef CGAL_COMPACT_MESH_VERTEX_BASE_3_H
#define CGAL_COMPACT_MESH_VERTEX_BASE_3_H

#include <CGAL/license/Mesh_3.h>


#include <CGAL/Regular_triangulation_vertex_base_3.h>
#include <CGAL/internal/Mesh_3/get_index.h>
#include <CGAL/Mesh_3/io_signature.h>
#include <CGAL/Has_timestamp.h>
#include <CGAL/tags.h>

namespace CGAL {
  
// Without erase counter
template <typename Concurrency_tag>
class Mesh_vertex_base_3_base
{
#if defined(CGAL_MESH_3_USE_LAZY_SORTED_REFINEMENT_QUEUE) \
 || defined(CGAL_MESH_3_USE_LAZY_UNSORTED_REFINEMENT_QUEUE)

public:
  // Erase counter (cf. Compact_container)
  unsigned int erase_counter() const
  {
    return this->m_erase_counter;
  }
  void set_erase_counter(unsigned int c)
  {
    this->m_erase_counter = c;
  }
  void increment_erase_counter()
  {
    ++this->m_erase_counter;
  }
  
protected:
  typedef unsigned int              Erase_counter_type;
  Erase_counter_type                m_erase_counter;
#endif
};

#ifdef CGAL_LINKED_WITH_TBB
// Specialized version (parallel)
template <>
class Mesh_vertex_base_3_base<Parallel_tag>
{
public:
  
  // Erase counter (cf. Compact_container)
  unsigned int erase_counter() const
  {
    return this->m_erase_counter;
  }
  void set_erase_counter(unsigned int c)
  {
    this->m_erase_counter = c;
  }
  void increment_erase_counter()
  {
    ++this->m_erase_counter;
  }
  
protected:
  typedef tbb::atomic<unsigned int> Erase_counter_type;
  Erase_counter_type                m_erase_counter;

};
#endif // CGAL_LINKED_WITH_TBB

// Class Mesh_vertex_base_3
// Vertex base class used in 3D meshing process.
// Adds information to Vb about the localization of the vertex in regards
// to the 3D input complex.
template<class GT,
         class MD,
         class Vb = Regular_triangulation_vertex_base_3<GT> >
class Mesh_vertex_base_3
: public Vb,
  public Mesh_vertex_base_3_base<
    typename Vb::Triangulation_data_structure::Concurrency_tag>
{
public:
  typedef Vb Cmvb3_base;
  typedef typename Vb::Vertex_handle  Vertex_handle;

  // To get correct vertex type in TDS
  template < class TDS3 >
  struct Rebind_TDS {
    typedef typename Vb::template Rebind_TDS<TDS3>::Other Vb3;
    typedef Mesh_vertex_base_3 <GT, MD, Vb3> Other;
  };

  // Types
  typedef typename MD::Index                      Index;
  typedef typename GT::FT                         FT;

  // Constructor
  Mesh_vertex_base_3()
    : Vb()
    , number_of_incident_facets_(0)
    , number_of_components_(0)
    , index_()
    , meshing_info_(0)
    , dimension_(-1)
    , cache_validity(false)
#ifdef CGAL_INTRUSIVE_LIST
    , next_intrusive_()
    , previous_intrusive_()
#endif //CGAL_INTRUSIVE_LIST
  {}

  // Default copy constructor and assignment operator are ok

  // Returns the dimension of the lowest dimensional face of the input 3D
  // complex that contains the vertex
  int in_dimension() const {
    if(dimension_ < -1) return -2-dimension_;
    else return dimension_; 
  }

  // Sets the dimension of the lowest dimensional face of the input 3D complex
  // that contains the vertex
  void set_dimension(const int dimension) {
    CGAL_assertion(dimension < 4);
    dimension_ = short(dimension);
  }

  // Tells if the vertex is marked as a special protecting ball
  bool is_special() const { return dimension_ < -1; }

  // Marks or unmarks the vertex as a special protecting ball
  void set_special(bool special = true) {
    if(special != (dimension_ < -1) )
      dimension_ = short(-2-dimension_);
  }

  // Returns the index of the lowest dimensional face of the input 3D complex
  // that contains the vertex
  Index index() const { return index_; }

  // Sets the index of the lowest dimensional face of the input 3D complex
  // that contains the vertex
  void set_index(const Index& index) { index_ = index; }

  // Accessors to meshing_info private data
  const FT& meshing_info() const { return meshing_info_; }
  void set_meshing_info(const FT& value) { meshing_info_ = value; }

#ifdef CGAL_INTRUSIVE_LIST
  Vertex_handle next_intrusive() const { return next_intrusive_; }
  void set_next_intrusive(Vertex_handle v)
  { 
    next_intrusive_ = v;
  }

  Vertex_handle previous_intrusive() const { return previous_intrusive_; }
  void set_previous_intrusive(Vertex_handle v)
  {
    previous_intrusive_ = v; 
  }
#endif

  /// For the determinism of Compact_container iterators
  ///@{
  typedef Tag_true Has_timestamp;

  std::size_t time_stamp() const {
    return time_stamp_;
  }
  void set_time_stamp(const std::size_t& ts) {
    time_stamp_ = ts;
  }
  ///@}

  bool is_c2t3_cache_valid() const {
    return cache_validity;
  }

  void invalidate_c2t3_cache()
  {
    cache_validity = false;
  }

  void set_c2t3_cache(const std::size_t i, const std::size_t j)
  {
    number_of_incident_facets_ = i;
    number_of_components_ = j;
    cache_validity = true;
  }

  std::size_t cached_number_of_incident_facets() const
  {
    return number_of_incident_facets_;
  }
    
  std::size_t cached_number_of_components() const
  {
    return number_of_components_;
  }

  static
  std::string io_signature()
  {
    return 
      Get_io_signature<Vb>()() + "+" +
      Get_io_signature<int>()() + "+" +
      Get_io_signature<Index>()();
  }
private:

  std::size_t number_of_incident_facets_;
  std::size_t number_of_components_; // number of components in the adjacency
  // graph of incident facets (in complex)


  // Index of the lowest dimensional face of the input 3D complex
  // that contains me
  Index index_;
  // Stores info needed by optimizers
  FT meshing_info_;

  // Dimension of the lowest dimensional face of the input 3D complex
  // that contains me. Negative values are a marker for special vertices.
  short dimension_;
  bool cache_validity;
#ifdef CGAL_INTRUSIVE_LIST
  Vertex_handle next_intrusive_;
  Vertex_handle previous_intrusive_;
#endif
  std::size_t time_stamp_;

};  // end class Mesh_vertex_base_3

template<class GT,
         class MD,
         class Vb>
inline
std::istream&
operator>>(std::istream &is, Mesh_vertex_base_3<GT,MD,Vb>& v)
{
  typedef Mesh_vertex_base_3<GT,MD,Vb> Vertex;
  typedef typename Vertex::Cmvb3_base Cmvb3_base;
  is >> static_cast<Cmvb3_base&>(v);
  int dimension;
  if(is_ascii(is)) {
    is >> dimension;

  } else {
    CGAL::read(is, dimension);
  }
  v.set_dimension(dimension);
  CGAL_assertion(v.in_dimension() >= -1);
  CGAL_assertion(v.in_dimension() < 4);
  typename Vertex::Index index =
    Mesh_3::internal::Read_mesh_domain_index<MD>()(v.in_dimension(), is);
  v.set_index(index);
  return is;
}

template<class GT,
         class MD,
         class Vb>
inline
std::ostream&
operator<<(std::ostream &os, const Mesh_vertex_base_3<GT,MD,Vb>& v)
{
  typedef Mesh_vertex_base_3<GT,MD,Vb> Vertex;
  typedef typename Vertex::Cmvb3_base Cmvb3_base;
  os << static_cast<const Cmvb3_base&>(v);
  if(is_ascii(os)) {
    os << " " << v.in_dimension()
       << " ";
  } else {
    CGAL::write(os, v.in_dimension());
  }
  Mesh_3::internal::Write_mesh_domain_index<MD>()(os,
                                                  v.in_dimension(),
                                                  v.index());
  return os;
}

}  // end namespace CGAL



#endif // CGAL_COMPACT_MESH_VERTEX_BASE_3_H