// Boost.Geometry (aka GGL, Generic Geometry Library)

// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.

// This file was modified by Oracle on 2013, 2014, 2017.
// Modifications copyright (c) 2013-2017 Oracle and/or its affiliates.

// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle

// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.

// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_WITHIN_INTERFACE_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_WITHIN_INTERFACE_HPP


#include <boost/concept_check.hpp>

#include <boost/variant/apply_visitor.hpp>
#include <boost/variant/static_visitor.hpp>
#include <boost/variant/variant_fwd.hpp>

#include <boost/geometry/algorithms/not_implemented.hpp>

#include <boost/geometry/core/tag.hpp>
#include <boost/geometry/core/tag_cast.hpp>

#include <boost/geometry/geometries/concepts/check.hpp>
#include <boost/geometry/strategies/concepts/within_concept.hpp>
#include <boost/geometry/strategies/default_strategy.hpp>
#include <boost/geometry/strategies/within.hpp>


namespace boost { namespace geometry
{

#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{

template
<
    typename Geometry1,
    typename Geometry2,
    typename Tag1 = typename tag<Geometry1>::type,
    typename Tag2 = typename tag<Geometry2>::type
>
struct within
    : not_implemented<Tag1, Tag2>
{};


} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH


namespace resolve_strategy
{

struct within
{
    template <typename Geometry1, typename Geometry2, typename Strategy>
    static inline bool apply(Geometry1 const& geometry1,
                             Geometry2 const& geometry2,
                             Strategy const& strategy)
    {
        concepts::within::check
            <
                typename tag<Geometry1>::type,
                typename tag<Geometry2>::type,
                typename tag_cast<typename tag<Geometry2>::type, areal_tag>::type,
                Strategy
            >();

        return dispatch::within<Geometry1, Geometry2>::apply(geometry1, geometry2, strategy);
    }

    template <typename Geometry1, typename Geometry2>
    static inline bool apply(Geometry1 const& geometry1,
                             Geometry2 const& geometry2,
                             default_strategy)
    {
        typedef typename strategy::within::services::default_strategy
            <
                Geometry1,
                Geometry2
            >::type strategy_type;

        return apply(geometry1, geometry2, strategy_type());
    }
};

} // namespace resolve_strategy


namespace resolve_variant
{

template <typename Geometry1, typename Geometry2>
struct within
{
    template <typename Strategy>
    static inline bool apply(Geometry1 const& geometry1,
                             Geometry2 const& geometry2,
                             Strategy const& strategy)
    {
        concepts::check<Geometry1 const>();
        concepts::check<Geometry2 const>();
        assert_dimension_equal<Geometry1, Geometry2>();

        return resolve_strategy::within::apply(geometry1,
                                               geometry2,
                                               strategy);
    }
};

template <BOOST_VARIANT_ENUM_PARAMS(typename T), typename Geometry2>
struct within<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>, Geometry2>
{
    template <typename Strategy>
    struct visitor: boost::static_visitor<bool>
    {
        Geometry2 const& m_geometry2;
        Strategy const& m_strategy;

        visitor(Geometry2 const& geometry2, Strategy const& strategy)
            : m_geometry2(geometry2)
            , m_strategy(strategy)
        {}

        template <typename Geometry1>
        bool operator()(Geometry1 const& geometry1) const
        {
            return within<Geometry1, Geometry2>::apply(geometry1,
                                                       m_geometry2,
                                                       m_strategy);
        }
    };

    template <typename Strategy>
    static inline bool
    apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry1,
          Geometry2 const& geometry2,
          Strategy const& strategy)
    {
        return boost::apply_visitor(visitor<Strategy>(geometry2, strategy),
                                    geometry1);
    }
};

template <typename Geometry1, BOOST_VARIANT_ENUM_PARAMS(typename T)>
struct within<Geometry1, boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
{
    template <typename Strategy>
    struct visitor: boost::static_visitor<bool>
    {
        Geometry1 const& m_geometry1;
        Strategy const& m_strategy;

        visitor(Geometry1 const& geometry1, Strategy const& strategy)
            : m_geometry1(geometry1)
            , m_strategy(strategy)
        {}

        template <typename Geometry2>
        bool operator()(Geometry2 const& geometry2) const
        {
            return within<Geometry1, Geometry2>::apply(m_geometry1,
                                                       geometry2,
                                                       m_strategy);
        }
    };

    template <typename Strategy>
    static inline bool
    apply(Geometry1 const& geometry1,
          boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry2,
          Strategy const& strategy)
    {
        return boost::apply_visitor(visitor<Strategy>(geometry1, strategy),
                                    geometry2
        );
    }
};

template <
    BOOST_VARIANT_ENUM_PARAMS(typename T1),
    BOOST_VARIANT_ENUM_PARAMS(typename T2)
>
struct within<
    boost::variant<BOOST_VARIANT_ENUM_PARAMS(T1)>,
    boost::variant<BOOST_VARIANT_ENUM_PARAMS(T2)>
>
{
    template <typename Strategy>
    struct visitor: boost::static_visitor<bool>
    {
        Strategy const& m_strategy;

        visitor(Strategy const& strategy): m_strategy(strategy) {}

        template <typename Geometry1, typename Geometry2>
        bool operator()(Geometry1 const& geometry1,
                        Geometry2 const& geometry2) const
        {
            return within<Geometry1, Geometry2>::apply(geometry1,
                                                       geometry2,
                                                       m_strategy);
        }
    };

    template <typename Strategy>
    static inline bool
    apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T1)> const& geometry1,
          boost::variant<BOOST_VARIANT_ENUM_PARAMS(T2)> const& geometry2,
          Strategy const& strategy)
    {
        return boost::apply_visitor(visitor<Strategy>(strategy),
                                    geometry1,
                                    geometry2);
    }
};

}


/*!
\brief \brief_check12{is completely inside}
\ingroup within
\details \details_check12{within, is completely inside}.
\tparam Geometry1 \tparam_geometry
\tparam Geometry2 \tparam_geometry
\param geometry1 \param_geometry which might be within the second geometry
\param geometry2 \param_geometry which might contain the first geometry
\return true if geometry1 is completely contained within geometry2,
    else false
\note The default strategy is used for within detection


\qbk{[include reference/algorithms/within.qbk]}

\qbk{
[heading Example]
[within]
[within_output]
}
 */
template<typename Geometry1, typename Geometry2>
inline bool within(Geometry1 const& geometry1, Geometry2 const& geometry2)
{
    return resolve_variant::within
        <
            Geometry1,
            Geometry2
        >::apply(geometry1, geometry2, default_strategy());
}

/*!
\brief \brief_check12{is completely inside} \brief_strategy
\ingroup within
\details \details_check12{within, is completely inside}, \brief_strategy. \details_strategy_reasons
\tparam Geometry1 \tparam_geometry
\tparam Geometry2 \tparam_geometry
\param geometry1 \param_geometry which might be within the second geometry
\param geometry2 \param_geometry which might contain the first geometry
\param strategy strategy to be used
\return true if geometry1 is completely contained within geometry2,
    else false

\qbk{distinguish,with strategy}
\qbk{[include reference/algorithms/within.qbk]}
\qbk{
[heading Available Strategies]
\* [link geometry.reference.strategies.strategy_within_winding Winding (coordinate system agnostic)]
\* [link geometry.reference.strategies.strategy_within_franklin Franklin (cartesian)]
\* [link geometry.reference.strategies.strategy_within_crossings_multiply Crossings Multiply (cartesian)]

[heading Example]
[within_strategy]
[within_strategy_output]

}
*/
template<typename Geometry1, typename Geometry2, typename Strategy>
inline bool within(Geometry1 const& geometry1,
                   Geometry2 const& geometry2,
                   Strategy const& strategy)
{
    return resolve_variant::within
        <
            Geometry1,
            Geometry2
        >::apply(geometry1, geometry2, strategy);
}

}} // namespace boost::geometry

#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_WITHIN_INTERFACE_HPP
