// Copyright (c) 2014
// INRIA Saclay-Ile de France (France)
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.0.1/NewKernel_d/include/CGAL/NewKernel_d/Cartesian_change_FT.h $
// $Id: include/CGAL/NewKernel_d/Cartesian_change_FT.h 50cfbde3b84 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s)     : Marc Glisse

#ifndef CGAL_KERNEL_D_CARTESIAN_CHANGE_FT_H
#define CGAL_KERNEL_D_CARTESIAN_CHANGE_FT_H

#include <CGAL/basic.h>
#include <CGAL/NT_converter.h>
#include <CGAL/transforming_iterator.h>
#include <CGAL/NewKernel_d/Cartesian_complete.h>

namespace CGAL {

template < typename Base_, typename FT_, typename LA_=CGAL::LA_eigen<FT_,typename Base_::Default_ambient_dimension> >
struct Cartesian_change_FT_base : public
        Base_
{
    constexpr Cartesian_change_FT_base(){}
    constexpr Cartesian_change_FT_base(int d):Base_(d){}

    typedef Cartesian_change_FT_base Self;
    typedef Base_ Kernel_base;
    typedef LA_ LA;

    template <class T, class D=void> struct Type : Inherit_type<Base_, T> {};
    template <class D> struct Type <FT_tag, D> { typedef FT_ type; };
    template <class D> struct Type <RT_tag, D> { typedef FT_ type; };

    typedef NT_converter<typename Get_type<Kernel_base, FT_tag>::type,FT_> FT_converter;
    typedef transforming_iterator<FT_converter,typename Kernel_base::Point_cartesian_const_iterator> Point_cartesian_const_iterator;
    typedef transforming_iterator<FT_converter,typename Kernel_base::Vector_cartesian_const_iterator> Vector_cartesian_const_iterator;
    //FIXME: use Iterator_list!
    /*
    template<class T,bool= std::is_same<typename iterator_tag_traits<T>::value_tag,FT_tag>::value>
    struct Iterator : Get_type<Kernel_base,T> {};
    template<class T> struct Iterator<T,true> {
      typedef transforming_iterator<FT_converter,typename Get_type<Kernel_base,T>::type> type;
    };
    */

    template<class Tag_,class Type_>
    struct Construct_cartesian_const_iterator_ {
            typedef typename Get_functor<Kernel_base, Tag_>::type Functor_base;
            Construct_cartesian_const_iterator_(){}
            Construct_cartesian_const_iterator_(Self const&r):f(r){}
            Functor_base f;
            typedef Type_ result_type;
            template<class T>
            result_type operator()(T const& v, Begin_tag)const{
                    return make_transforming_iterator(f(v,Begin_tag()),FT_converter());
            }
            template<class T>
            result_type operator()(T const& v, End_tag)const{
                    return make_transforming_iterator(f(v,End_tag()),FT_converter());
            }
    };
    typedef Construct_cartesian_const_iterator_<Construct_ttag<Point_cartesian_const_iterator_tag>,Point_cartesian_const_iterator> Construct_point_cartesian_const_iterator;
    typedef Construct_cartesian_const_iterator_<Construct_ttag<Vector_cartesian_const_iterator_tag>,Vector_cartesian_const_iterator> Construct_vector_cartesian_const_iterator;

    template<class Tag_>
    struct Compute_cartesian_coordinate {
            typedef typename Get_functor<Kernel_base, Tag_>::type Functor_base;
            Compute_cartesian_coordinate(){}
            Compute_cartesian_coordinate(Self const&r):f(r){}
            Functor_base f;
            typedef FT_ result_type;
            template<class Obj_>
            result_type operator()(Obj_ const& v,int i)const{
                    return FT_converter()(f(v,i));
            }
    };

    template<class T,class U=void,class=typename Get_functor_category<Cartesian_change_FT_base,T>::type> struct Functor :
            Inherit_functor<Kernel_base,T,U> { };
    template<class T,class U> struct Functor<T,U,Compute_tag> { };
    template<class T,class U> struct Functor<T,U,Predicate_tag> { };
    template<class D> struct Functor<Compute_point_cartesian_coordinate_tag,D,Compute_tag> {
            typedef Compute_cartesian_coordinate<Compute_point_cartesian_coordinate_tag> type;
    };
    template<class D> struct Functor<Compute_vector_cartesian_coordinate_tag,D,Compute_tag> {
            typedef Compute_cartesian_coordinate<Compute_vector_cartesian_coordinate_tag> type;
    };
    template<class D> struct Functor<Construct_ttag<Point_cartesian_const_iterator_tag>,D,Construct_iterator_tag> {
            typedef Construct_point_cartesian_const_iterator type;
    };
    template<class D> struct Functor<Construct_ttag<Vector_cartesian_const_iterator_tag>,D,Construct_iterator_tag> {
            typedef Construct_vector_cartesian_const_iterator type;
    };
};

template < typename Base_, typename FT_>
struct Cartesian_change_FT : public
        Cartesian_change_FT_base<Base_,FT_>
{
    constexpr Cartesian_change_FT(){}
    constexpr Cartesian_change_FT(int d):Cartesian_change_FT_base<Base_,FT_>(d){}
};

} //namespace CGAL

#endif // CGAL_KERNEL_D_CARTESIAN_CHANGE_FT_H

