// 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.


#if !BOOST_PP_IS_ITERATING

#ifndef LUABIND_CALL_MEMBER_HPP_INCLUDED
#define LUABIND_CALL_MEMBER_HPP_INCLUDED

#include <luabind/config.hpp>
#include <luabind/detail/convert_to_lua.hpp>
#include <luabind/detail/pcall.hpp>
#include <luabind/detail/stack_utils.hpp>
#include <luabind/error.hpp>
#include <luabind/detail/object.hpp> // TODO: REMOVE DEPENDENCY

#include <boost/mpl/apply_wrap.hpp>
#include <boost/preprocessor/control/if.hpp>
#include <boost/preprocessor/facilities/expand.hpp>
#include <boost/preprocessor/repetition/enum.hpp>
#include <boost/tuple/tuple.hpp>

namespace luabind
{
    namespace detail
    {

        namespace mpl = boost::mpl;

        // if the proxy_member_caller returns non-void
            template<class Ret, class Tuple>
            class proxy_member_caller
            {
//          friend class luabind::object;
            public:

                proxy_member_caller(lua_State* L_, const Tuple args)
                    : L(L_)
                    , m_args(args)
                    , m_called(false)
                {
                }

                proxy_member_caller(const proxy_member_caller& rhs)
                    : L(rhs.L)
                    , m_args(rhs.m_args)
                    , m_called(rhs.m_called)
                {
                    rhs.m_called = true;
                }

                ~proxy_member_caller() LUABIND_MAY_THROW
                {
                    if (m_called) return;

                    m_called = true;

                    // don't count the function and self-reference
                    // since those will be popped by pcall
                    int top = lua_gettop(L) - 2;

                    // pcall will pop the function and self reference
                    // and all the parameters

                    push_args_from_tuple<1>::apply(L, m_args);
                    if (pcall(L, boost::tuples::length<Tuple>::value + 1, 0))
                    {
                        assert(lua_gettop(L) == top + 1);
#ifndef LUABIND_NO_EXCEPTIONS
                        throw luabind::error(L);
#else
                        error_callback_fun e = get_error_callback();
                        if (e) e(L);

                        assert(0 && "the lua function threw an error and exceptions are disabled."
                                "If you want to handle this error use luabind::set_error_callback()");
                        std::terminate();
#endif
                    }
                    // pops the return values from the function
                    stack_pop pop(L, lua_gettop(L) - top);
                }

                operator Ret()
                {
                    typename mpl::apply_wrap2<default_policy,Ret,lua_to_cpp>::type converter;

                    m_called = true;

                    // don't count the function and self-reference
                    // since those will be popped by pcall
                    int top = lua_gettop(L) - 2;

                    // pcall will pop the function and self reference
                    // and all the parameters
                    push_args_from_tuple<1>::apply(L, m_args);
                    if (pcall(L, boost::tuples::length<Tuple>::value + 1, 1))
                    {
                        assert(lua_gettop(L) == top + 1);
#ifndef LUABIND_NO_EXCEPTIONS
                        throw luabind::error(L);
#else
                        error_callback_fun e = get_error_callback();
                        if (e) e(L);

                        assert(0 && "the lua function threw an error and exceptions are disabled."
                            "If you want to handle this error use luabind::set_error_callback()");
                        std::terminate();
#endif
                    }

                    // pops the return values from the function
                    stack_pop pop(L, lua_gettop(L) - top);

                    if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
                    {
                        assert(lua_gettop(L) == top + 1);
#ifndef LUABIND_NO_EXCEPTIONS
                        throw cast_failed(L, typeid(Ret));
#else
                        cast_failed_callback_fun e = get_cast_failed_callback();
                        if (e) e(L, typeid(Ret));

                        assert(0 && "the lua function's return value could not be converted."
                            "If you want to handle this error use luabind::set_error_callback()");
                        std::terminate();
#endif
                    }

                    return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
                }

                template<class Policies>
                Ret operator[](const Policies& p)
                {
                    typedef typename find_conversion_policy<0, Policies>::type converter_policy;
                    typename mpl::apply_wrap2<converter_policy,Ret,lua_to_cpp>::type converter;

                    m_called = true;

                    // don't count the function and self-reference
                    // since those will be popped by pcall
                    int top = lua_gettop(L) - 2;

                    // pcall will pop the function and self reference
                    // and all the parameters

                    detail::push_args_from_tuple<1>::apply(L, m_args, p);
                    if (pcall(L, boost::tuples::length<Tuple>::value + 1, 1))
                    {
                        assert(lua_gettop(L) == top + 1);
#ifndef LUABIND_NO_EXCEPTIONS
                        throw error(L);
#else
                        error_callback_fun e = get_error_callback();
                        if (e) e(L);

                        assert(0 && "the lua function threw an error and exceptions are disabled."
                            "If you want to handle this error use luabind::set_error_callback()");
                        std::terminate();
#endif
                    }

                    // pops the return values from the function
                    stack_pop pop(L, lua_gettop(L) - top);

                    if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
                    {
                        assert(lua_gettop(L) == top + 1);
#ifndef LUABIND_NO_EXCEPTIONS
                        throw cast_failed(L, typeid(Ret));
#else
                        cast_failed_callback_fun e = get_cast_failed_callback();
                        if (e) e(L, typeid(Ret));

                        assert(0 && "the lua function's return value could not be converted."
                            "If you want to handle this error use luabind::set_error_callback()");
                        std::terminate();
#endif
                    }
                    return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
                }

            private:

                lua_State* L;
                Tuple m_args;
                mutable bool m_called;

            };

        // if the proxy_member_caller returns void
            template<class Tuple>
            class proxy_member_void_caller
            {
            friend class luabind::object;
            public:

                proxy_member_void_caller(lua_State* L_, const Tuple args)
                    : L(L_)
                    , m_args(args)
                    , m_called(false)
                {
                }

                proxy_member_void_caller(const proxy_member_void_caller& rhs)
                    : L(rhs.L)
                    , m_args(rhs.m_args)
                    , m_called(rhs.m_called)
                {
                    rhs.m_called = true;
                }

                ~proxy_member_void_caller()
                {
                    if (m_called) return;

                    m_called = true;

                    // don't count the function and self-reference
                    // since those will be popped by pcall
                    int top = lua_gettop(L) - 2;

                    // pcall will pop the function and self reference
                    // and all the parameters

                    push_args_from_tuple<1>::apply(L, m_args);
                    if (pcall(L, boost::tuples::length<Tuple>::value + 1, 0))
                    {
                        assert(lua_gettop(L) == top + 1);
#ifndef LUABIND_NO_EXCEPTIONS
                        throw luabind::error(L);
#else
                        error_callback_fun e = get_error_callback();
                        if (e) e(L);

                        assert(0 && "the lua function threw an error and exceptions are disabled."
                            "If you want to handle this error use luabind::set_error_callback()");
                        std::terminate();
#endif
                    }
                    // pops the return values from the function
                    stack_pop pop(L, lua_gettop(L) - top);
                }

                template<class Policies>
                void operator[](const Policies& p)
                {
                    m_called = true;

                    // don't count the function and self-reference
                    // since those will be popped by pcall
                    int top = lua_gettop(L) - 2;

                    // pcall will pop the function and self reference
                    // and all the parameters

                    detail::push_args_from_tuple<1>::apply(L, m_args, p);
                    if (pcall(L, boost::tuples::length<Tuple>::value + 1, 0))
                    {
                        assert(lua_gettop(L) == top + 1);
#ifndef LUABIND_NO_EXCEPTIONS
                        throw error(L);
#else
                        error_callback_fun e = get_error_callback();
                        if (e) e(L);

                        assert(0 && "the lua function threw an error and exceptions are disabled."
                            "If you want to handle this error use luabind::set_error_callback()");
                        std::terminate();
#endif
                    }
                    // pops the return values from the function
                    stack_pop pop(L, lua_gettop(L) - top);
                }

            private:
                lua_State* L;
                Tuple m_args;
                mutable bool m_called;

            };

    } // detail

    #define BOOST_PP_ITERATION_PARAMS_1 (4, (0, LUABIND_MAX_ARITY, <luabind/detail/call_member.hpp>, 1))
    #include BOOST_PP_ITERATE()

}

#endif // LUABIND_CALL_MEMBER_HPP_INCLUDED

#else
#if BOOST_PP_ITERATION_FLAGS() == 1

#define LUABIND_TUPLE_PARAMS(z, n, data) const A##n *
#define LUABIND_OPERATOR_PARAMS(z, n, data) const A##n & a##n

    template<class R BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
    typename boost::mpl::if_<boost::is_void<R>
            , luabind::detail::proxy_member_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
            , luabind::detail::proxy_member_caller<R, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
    call_member(object const& obj, const char* name BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _))
    {
        typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
#if BOOST_PP_ITERATION() == 0
        tuple_t args;
#else
        tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
#endif

        typedef typename boost::mpl::if_<boost::is_void<R>
            , luabind::detail::proxy_member_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
            , luabind::detail::proxy_member_caller<R, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;

        // this will be cleaned up by the proxy object
        // once the call has been made

        // get the function
        obj.push(obj.interpreter());
        lua_pushstring(obj.interpreter(), name);
        lua_gettable(obj.interpreter(), -2);
        // duplicate the self-object
        lua_pushvalue(obj.interpreter(), -2);
        // remove the bottom self-object
        lua_remove(obj.interpreter(), -3);

        // now the function and self objects
        // are on the stack. These will both
        // be popped by pcall
        return proxy_type(obj.interpreter(), args);
    }

#undef LUABIND_OPERATOR_PARAMS
#undef LUABIND_TUPLE_PARAMS

#endif
#endif
