// Copyright (c) 2011 Tel-Aviv University (Israel), INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Arrangement_on_surface_2/include/CGAL/Arr_rat_arc/Rational_function_pair.h $
// $Id: include/CGAL/Arr_rat_arc/Rational_function_pair.h b26b07a1242 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s)     : Oren Salzman <orenzalz@post.tau.ac.il >
//                 Michael Hemmer <Michael.Hemmer@sophia.inria.fr>

#ifndef CGAL_RATIONAL_FUNCTION_ORDERED_PAIR_H
#define CGAL_RATIONAL_FUNCTION_ORDERED_PAIR_H

#include <CGAL/license/Arrangement_on_surface_2.h>



#include <CGAL/Arr_rat_arc/Base_rational_arc_ds_1.h>
#include <CGAL/Arr_rat_arc/Rational_function.h>
#include <CGAL/Arr_rat_arc/Rational_function_canonicalized_pair.h>

namespace CGAL {
namespace Arr_rational_arc {

template <typename AlgebraicKernel_d_1 >
class Rational_function_pair:
    public Base_rational_arc_ds_1<AlgebraicKernel_d_1>
{
public:
  typedef AlgebraicKernel_d_1                         Algebraic_kernel_d_1;
  typedef Base_rational_arc_ds_1<Algebraic_kernel_d_1> Base;
  typedef CGAL::Arr_rational_arc::Rational_function_canonicalized_pair<Algebraic_kernel_d_1>
    Rational_function_canonicalized_pair;
  typedef CGAL::Arr_rational_arc::Rational_function<Algebraic_kernel_d_1>
                                                      Rational_function;

  typedef typename Base::Polynomial_1                 Polynomial_1;
  typedef typename Base::Algebraic_real_1             Algebraic_real_1;
  typedef typename Base::Algebraic_vector             Algebraic_vector;
  typedef typename Base::Multiplicity                 Multiplicity;
  typedef typename Base::Multiplicity_vector          Multiplicity_vector;
  typedef typename Base::Root_multiplicity_vector     Root_multiplicity_vector;

public:
  Rational_function_pair(const Rational_function_canonicalized_pair& rat_pair,
                         bool is_opposite = false) :
    _rat_pair(rat_pair), _is_opposite(is_opposite)
  {}

  Comparison_result compare_f_g_at(const Algebraic_real_1& x ,
                                   CGAL::Sign epsilon = CGAL::ZERO)
  {
    Comparison_result cr =  _rat_pair.compare_f_g_at(x,epsilon);
    return (_is_opposite) ? -cr : cr ;
  }

  Comparison_result compare_f_g_at(Arr_parameter_space boundary)
  {
    Comparison_result cr =  _rat_pair.compare_f_g_at(boundary);
    return (_is_opposite) ? -cr : cr ;
  }

  bool is_intersecting_in_range(const Arr_parameter_space left_parameter_space,
                                const Algebraic_real_1 left,
                                const Arr_parameter_space right_parameter_space,
                                const Algebraic_real_1 right)
  {
    return _rat_pair.is_intersecting_in_range(left_parameter_space, left,
                                              right_parameter_space, right);
  }

  const Algebraic_vector & roots() const
  {
    return _rat_pair.roots();
  }

  const Multiplicity_vector & multiplicities() const
  {
    return _rat_pair.multiplicities();
  }

private:
  const Rational_function_canonicalized_pair& _rat_pair;
  bool                   _is_opposite;
}; // Rational_function_pair


}   //namespace Arr_rational_arc
}   //namespace CGAL {

#endif //CGAL_RATIONAL_FUNCTION_ORDERED_PAIR_H

