// Copyright (c) 2003 Daniel Wallin and Arvid Norberg

// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.


#ifndef LUABIND_CONTAINER_POLICY_HPP_INCLUDED
#define LUABIND_CONTAINER_POLICY_HPP_INCLUDED

#include <luabind/config.hpp>
#include <luabind/detail/decorate_type.hpp>  // for LUABIND_DECORATE_TYPE
#include <luabind/detail/policy.hpp>    // for policy_cons, etc
#include <luabind/detail/primitives.hpp>  // for null_type (ptr only), etc

#include <boost/mpl/apply_wrap.hpp>
#include <boost/mpl/if.hpp>             // for if_
#include <boost/type_traits/is_same.hpp>  // for is_same

namespace luabind { namespace detail {

    namespace mpl = boost::mpl;

    template<class Policies>
    struct container_converter_lua_to_cpp
    {
        int consumed_args() const
        {
            return 1;
        }

        template<class T>
        T apply(lua_State* L, by_const_reference<T>, int index)
        {
            typedef typename T::value_type value_type;

            typedef typename find_conversion_policy<1, Policies>::type converter_policy;
            typename mpl::apply_wrap2<converter_policy,value_type,lua_to_cpp>::type converter;

            T container;

            lua_pushnil(L);
            while (lua_next(L, index))
            {
                container.push_back(converter.apply(L, LUABIND_DECORATE_TYPE(value_type), -1));
                lua_pop(L, 1); // pop value
            }

            return container;
        }

        template<class T>
        T apply(lua_State* L, by_value<T>, int index)
        {
            return apply(L, by_const_reference<T>(), index);
        }

        template<class T>
        static int match(lua_State* L, by_const_reference<T>, int index)
        {
            if (lua_istable(L, index)) return 0; else return -1;
        }

        template<class T>
        void converter_postcall(lua_State*, T, int) {}
    };

    template<class Policies>
    struct container_converter_cpp_to_lua
    {
        template<class T>
        void apply(lua_State* L, const T& container)
        {
            typedef typename T::value_type value_type;

            typedef typename find_conversion_policy<1, Policies>::type converter_policy;
            typename mpl::apply_wrap2<converter_policy,value_type,lua_to_cpp>::type converter;

            lua_newtable(L);

            int index = 1;

            for (typename T::const_iterator i = container.begin(); i != container.end(); ++i)
            {
                converter.apply(L, *i);
                lua_rawseti(L, -2, index);
                ++index;
            }
        }
    };

    template<int N, class Policies>
//  struct container_policy : converter_policy_tag
    struct container_policy : conversion_policy<N>
    {
//      BOOST_STATIC_CONSTANT(int, index = N);

        static void precall(lua_State*, const index_map&) {}
        static void postcall(lua_State*, const index_map&) {}

        struct only_accepts_nonconst_pointers {};

        template<class T, class Direction>
        struct apply
        {
            typedef typename boost::mpl::if_<boost::is_same<lua_to_cpp, Direction>
                , container_converter_lua_to_cpp<Policies>
                , container_converter_cpp_to_lua<Policies>
            >::type type;
        };
    };

}}

namespace luabind
{
    template<int N>
    detail::policy_cons<detail::container_policy<N, detail::null_type>, detail::null_type>
    container(LUABIND_PLACEHOLDER_ARG(N))
    {
        return detail::policy_cons<detail::container_policy<N, detail::null_type>, detail::null_type>();
    }

    template<int N, class Policies>
    detail::policy_cons<detail::container_policy<N, Policies>, detail::null_type>
    container(LUABIND_PLACEHOLDER_ARG(N), const Policies&)
    {
        return detail::policy_cons<detail::container_policy<N, Policies>, detail::null_type>();
    }
}

#endif // LUABIND_CONTAINER_POLICY_HPP_INCLUDED
