// Copyright (c) 2014
// INRIA Saclay-Ile de France (France)
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser 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: LGPL-3.0+
//
// Author(s)     : Marc Glisse

#ifndef CGAL_KD_CARTESIAN_STATIC_FILTERS_H
#define CGAL_KD_CARTESIAN_STATIC_FILTERS_H
#include <CGAL/NewKernel_d/functor_tags.h>
#include <CGAL/Dimension.h>
#include <CGAL/internal/Static_filters/tools.h> // bug, should be included by the next one
#include <CGAL/internal/Static_filters/Orientation_2.h>
#include <boost/mpl/if.hpp>

namespace CGAL {
namespace SFA { // static filter adapter
// Note that this would be quite a bit simpler without stateful kernels
template <class Base_,class R_> struct Orientation_of_points_2 : private Store_kernel<R_> {
	CGAL_FUNCTOR_INIT_STORE(Orientation_of_points_2)
	typedef typename Get_type<R_, Point_tag>::type	Point;
	typedef typename Get_type<R_, Orientation_tag>::type result_type;
	typedef typename Get_type<R_, FT_tag>::type FT;
	typedef typename Get_functor<R_, Compute_point_cartesian_coordinate_tag>::type CC;
	typedef typename Get_functor<Base_, Orientation_of_points_tag>::type Orientation_base;
	// TODO: Move this out for easy reuse
	struct Adapter {
		struct Point_2 {
			R_ const&r; CC const&c; Point const& p;
			Point_2(R_ const&r_, CC const&c_, Point const&p_):r(r_),c(c_),p(p_){}
			// use result_of instead?
			typename CC::result_type x()const{return c(p,0);}
			typename CC::result_type y()const{return c(p,1);}
		};
		struct Vector_2 {};
		struct Circle_2 {};
		struct Orientation_2 {
			typedef typename Orientation_of_points_2::result_type result_type;
			result_type operator()(Point_2 const&A, Point_2 const&B, Point_2 const&C)const{
				Point const* t[3]={&A.p,&B.p,&C.p};
				return Orientation_base(A.r)(make_transforming_iterator<Dereference_functor>(t+0),make_transforming_iterator<Dereference_functor>(t+3));
			}
		};
	};
	template<class Iter> result_type operator()(Iter f, Iter CGAL_assertion_code(e))const{
		CC c(this->kernel());
		Point const& A=*f;
		Point const& B=*++f;
		Point const& C=*++f;
		CGAL_assertion(++f==e);
		typedef typename Adapter::Point_2 P;
		return typename internal::Static_filters_predicates::Orientation_2<Adapter>()(P(this->kernel(),c,A),P(this->kernel(),c,B),P(this->kernel(),c,C));
	}
};
}

template <class Dim_ /* should be implicit */, class R_, class Derived_=Default>
struct Cartesian_static_filters : public R_ {
  CGAL_CONSTEXPR Cartesian_static_filters(){}
  CGAL_CONSTEXPR Cartesian_static_filters(int d):R_(d){}
};

template <class R_, class Derived_>
struct Cartesian_static_filters<Dimension_tag<2>, R_, Derived_> : public R_ {
  CGAL_CONSTEXPR Cartesian_static_filters(){}
  CGAL_CONSTEXPR Cartesian_static_filters(int d):R_(d){}
	typedef Cartesian_static_filters<Dimension_tag<2>, R_, Derived_> Self;
	typedef typename Default::Get<Derived_,Self>::type Derived;
	template <class T, class=void> struct Functor : Inherit_functor<R_, T> {};
	template <class D> struct Functor <Orientation_of_points_tag,D> {
		typedef
			//typename boost::mpl::if_ <
			//boost::is_same<D,No_filter_tag>,
			//typename Get_functor<R_, Orientation_of_points_tag>::type,
			SFA::Orientation_of_points_2<R_,Derived>
			//	>::type
				type;
	};
};

}

#endif
