// 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/v6.2/SearchStructures/include/CGAL/Tree_base.h $
// $Id: include/CGAL/Tree_base.h cac3e9d75e2 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s)     : Gabriele Neyer

#ifndef CGAL_TREE_BASE_H
#define CGAL_TREE_BASE_H

#include <CGAL/license/SearchStructures.h>


#include <iterator>
#include <iostream>
#include <functional>
#include <list>
#include <vector>
#include <CGAL/assertions.h>

#ifndef CGAL_TREE_BASE_nullptr
#define CGAL_TREE_BASE_nullptr 0
#endif

#define stlvector

namespace CGAL {

//link type definition of an ordinary vertex of the tree
template < typename Node >
struct Tree_node_base {
  Node *parent_link;
  Node *left_link;
  Node *right_link;
  Tree_node_base()
    : parent_link(nullptr), left_link(nullptr), right_link(nullptr)
  {}
  Tree_node_base(Node* ll, Node* rl)
    : parent_link(nullptr), left_link(ll), right_link(rl)
  {}
};


// -------------------------------------------------------------------
// pure virtual abstract base class.
// Designed according to the Prototype Design Pattern
// A tree class has to be derived from this class.

template <class C_Data, class C_Window>
class Tree_base
{

protected:
  Tree_base(Tree_base const &); // prevent access
  void operator= (Tree_base const &); // prevent access

public:
  typedef double vit;
  typedef int lit;
  typedef int lbit;
  typedef double vbit;
  typedef char oit;
  //  typedef std::vector<C_Data>::iterator vit;
  //typedef std::list<C_Data>::iterator lit;
  //typedef std::back_insert_iterator<lit>  lbit;
  //typedef std::back_insert_iterator<vit>  vbit;
  typedef Tree_base<C_Data, C_Window> Tree_base_type;
  Tree_base() {}
  virtual ~Tree_base() {}

  // 'clone()' returns an object which can be used as argument to 'delete'
  virtual Tree_base<C_Data, C_Window>  *clone() const = 0;
  //virtual Tree_base_type   *clone() const = 0;

  // 'make_tree()' returns an object which can be used as argument to 'delete'
  virtual bool make_tree(const typename std::list<C_Data>::iterator& beg,
                         const typename std::list<C_Data>::iterator& end,
                         lit *dummy= nullptr) =0;
#ifdef stlvector
  virtual bool make_tree(const typename std::vector<C_Data>::iterator& beg,
                         const typename std::vector<C_Data>::iterator& end,
                         vit *dummy= nullptr) =0;
#endif
#ifdef carray
  virtual bool make_tree(const C_Data *beg,
                         const C_Data *end) =0;
#endif
  virtual std::back_insert_iterator< std::list<C_Data> >
    window_query(C_Window const &win,  std::back_insert_iterator<
                 std::list<C_Data> > out,lbit *dummy= nullptr ) = 0;
  virtual std::back_insert_iterator< std::vector<C_Data> >
    window_query(C_Window const &win,  std::back_insert_iterator<
                  std::vector<C_Data> > out,vbit *dummy= nullptr) = 0;
#ifdef carray
  virtual C_Data * window_query( C_Window const &win,
                                C_Data * out) = 0;
#endif
#ifdef ostreamiterator
  typedef std::ostream_iterator< C_Data> oit;
  virtual  std::ostream_iterator< C_Data> window_query( C_Window const &win,
                                     std::ostream_iterator< C_Data> out,
                                        oit *dummy= nullptr               ) = 0;
#endif
  virtual  std::back_insert_iterator< std::list< C_Data> >
    enclosing_query( C_Window const &win,  std::back_insert_iterator<
                     std::list< C_Data> > out, lbit *dummy= nullptr ) = 0;
  virtual  std::back_insert_iterator< std::vector< C_Data> >
    enclosing_query( C_Window const &win,  std::back_insert_iterator<
                     std::vector< C_Data> > out,vbit *dummy= nullptr ) = 0;
#ifdef carray
  virtual   C_Data * enclosing_query( C_Window const &win,
                                    C_Data *out) = 0;
#endif
#ifdef ostreamiterator
  virtual  std::ostream_iterator< C_Data> enclosing_query( C_Window const &win,
                                           std::ostream_iterator< C_Data> out,
                                           oit *dummy= nullptr) = 0;
#endif
  virtual bool is_inside( C_Window const &win,
                          C_Data const& object) const =0;
  virtual bool is_anchor()const =0;
  virtual bool is_valid()const =0;
};


// -------------------------------------------------------------------
// Tree Anchor: this class is used as a recursion anchor.
// The derived tree classes can be nested. Use this class as the
// most inner class. This class is doing nothing except stopping the recursion

template <class C_Data, class C_Window>
class Tree_anchor: public Tree_base< C_Data,  C_Window>
{
public:
  // Construct a factory with the given factory as sublayer
  Tree_anchor() {}
  virtual ~Tree_anchor(){}
  Tree_base<C_Data, C_Window> *clone() const { return const_cast<Tree_anchor<C_Data, C_Window> *>(this); }
  typedef Tree_base<C_Data, C_Window> tbt;
//  Tree_base_type *clone() const { return new Tree_anchor(); }

  bool make_tree(const typename std::list< C_Data>::iterator& /*beg*/,
                 const typename std::list< C_Data>::iterator& /*end*/,
                 typename tbt::lit * = nullptr)
  {
    return true;
  }
#ifdef stlvector
  bool make_tree(const typename std::vector< C_Data>::iterator& /*beg*/,
                 const typename std::vector< C_Data>::iterator& /*end*/,
                 typename tbt::vit * = nullptr)
  {
    return true;
  }
#endif
#ifdef carray
  bool make_tree(const C_Data * /*beg*/,
                 const C_Data * /*end*/)
  {
    return true;
  }
#endif
   std::back_insert_iterator< std::list< C_Data> >
      window_query(
       C_Window const &,
       std::back_insert_iterator< std::list< C_Data> > out,
       typename tbt::lbit * = nullptr){
    return out;
  }

  std::back_insert_iterator< std::vector< C_Data> >
      window_query( C_Window const &,
                    std::back_insert_iterator< std::vector< C_Data> > out,
                    typename tbt::vbit * = nullptr){
    return out;
  }
#ifdef carray
   C_Data * window_query( C_Window const &,
                     C_Data * out){
    return out;
  }
#endif
#ifdef ostreamiterator
   std::ostream_iterator< C_Data> window_query( C_Window const &,
                                        std::ostream_iterator< C_Data> out,
                                        typename tbt::oit *dummy= nullptr){
    return out;
  }
#endif
   std::back_insert_iterator< std::list< C_Data> > enclosing_query( C_Window const &,
                                   std::back_insert_iterator< std::list< C_Data> > out,
                                   typename tbt::lbit * = nullptr){
    return out;
  }
   std::back_insert_iterator< std::vector< C_Data> > enclosing_query( C_Window const &,
                                   std::back_insert_iterator< std::vector< C_Data> > out,
                                   typename tbt::vbit * = nullptr){
    return out;
  }
#ifdef carray
   C_Data * enclosing_query( C_Window const &,
                        C_Data * out){
    return out;
  }
#endif
#ifdef ostreamiterator
   std::ostream_iterator< C_Data> enclosing_query( C_Window const &,
                                           std::ostream_iterator< C_Data> out,
                                           typename tbt::oit *dummy= nullptr){
    return out;
  }
#endif
  bool is_valid()const{ return true;}

protected:

  bool is_inside( C_Window const &,
                  C_Data const&) const
  {
    return true;
  }
  bool is_anchor()const {return true;}
};

} //namespace CGAL

#endif
