/*******************************************************************************
 * This file is part of the "https://github.com/blackmatov/invoke.hpp"
 * MIT License
 *
 * Copyright (C) 2018-2023, by Matvey Cherevko (blackmatov@gmail.com)
 *
 * 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.
 ******************************************************************************/

#pragma once

#include <tuple>
#include <utility>
#include <functional>
#include <type_traits>

#define INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(...) \
    noexcept(noexcept(__VA_ARGS__)) -> decltype (__VA_ARGS__) { return __VA_ARGS__; }

//
// void_t
//

namespace invoke_hpp
{
    namespace impl
    {
        template < typename... Args >
        struct make_void {
            using type = void;
        };
    }

    template < typename... Args >
    using void_t = typename impl::make_void<Args...>::type;
}

//
// integer_sequence
//

namespace invoke_hpp
{
    template < typename T, T... Ints >
    struct integer_sequence {
        using value_type = T;
        static constexpr std::size_t size() noexcept { return sizeof...(Ints); }
    };

    template < std::size_t... Ints >
    using index_sequence = integer_sequence<std::size_t, Ints...>;

    namespace impl
    {
        template < typename T, std::size_t N, T... Ints >
        struct make_integer_sequence_impl
        : make_integer_sequence_impl<T, N - 1, N - 1, Ints...> {};

        template < typename T, T... Ints >
        struct make_integer_sequence_impl<T, 0, Ints...>
        : integer_sequence<T, Ints...> {};
    }

    template < typename T, std::size_t N >
    using make_integer_sequence = impl::make_integer_sequence_impl<T, N>;

    template < std::size_t N >
    using make_index_sequence = make_integer_sequence<std::size_t, N>;

    template < typename... Ts >
    using index_sequence_for = make_index_sequence<sizeof...(Ts)>;
}

//
// is_reference_wrapper
//

namespace invoke_hpp
{
    namespace impl
    {
        template < typename T >
        struct is_reference_wrapper_impl
        : std::false_type {};

        template < typename U >
        struct is_reference_wrapper_impl<std::reference_wrapper<U>>
        : std::true_type {};
    }

    template < typename T >
    struct is_reference_wrapper
    : impl::is_reference_wrapper_impl<typename std::remove_cv<T>::type> {};
}

//
// invoke
//

namespace invoke_hpp
{
    namespace impl
    {
        //
        // invoke_member_object_impl
        //

        template
        <
            typename Base, typename F, typename Derived,
            typename std::enable_if<std::is_base_of<Base, typename std::decay<Derived>::type>::value, int>::type = 0
        >
        constexpr auto invoke_member_object_impl(F Base::* f, Derived&& ref)
        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
            std::forward<Derived>(ref).*f)

        template
        <
            typename Base, typename F, typename RefWrap,
            typename std::enable_if<is_reference_wrapper<typename std::decay<RefWrap>::type>::value, int>::type = 0
        >
        constexpr auto invoke_member_object_impl(F Base::* f, RefWrap&& ref)
        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
            ref.get().*f)

        template
        <
            typename Base, typename F, typename Pointer,
            typename std::enable_if<
                !std::is_base_of<Base, typename std::decay<Pointer>::type>::value &&
                !is_reference_wrapper<typename std::decay<Pointer>::type>::value
            , int>::type = 0
        >
        constexpr auto invoke_member_object_impl(F Base::* f, Pointer&& ptr)
        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
            (*std::forward<Pointer>(ptr)).*f)

        //
        // invoke_member_function_impl
        //

        template
        <
            typename Base, typename F, typename Derived, typename... Args,
            typename std::enable_if<std::is_base_of<Base, typename std::decay<Derived>::type>::value, int>::type = 0
        >
        constexpr auto invoke_member_function_impl(F Base::* f, Derived&& ref, Args&&... args)
        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
            (std::forward<Derived>(ref).*f)(std::forward<Args>(args)...))

        template
        <
            typename Base, typename F, typename RefWrap, typename... Args,
            typename std::enable_if<is_reference_wrapper<typename std::decay<RefWrap>::type>::value, int>::type = 0
        >
        constexpr auto invoke_member_function_impl(F Base::* f, RefWrap&& ref, Args&&... args)
        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
            (ref.get().*f)(std::forward<Args>(args)...))

        template
        <
            typename Base, typename F, typename Pointer, typename... Args,
            typename std::enable_if<
                !std::is_base_of<Base, typename std::decay<Pointer>::type>::value &&
                !is_reference_wrapper<typename std::decay<Pointer>::type>::value
            , int>::type = 0
        >
        constexpr auto invoke_member_function_impl(F Base::* f, Pointer&& ptr, Args&&... args)
        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
            ((*std::forward<Pointer>(ptr)).*f)(std::forward<Args>(args)...))
    }

    template
    <
        typename F, typename... Args,
        typename std::enable_if<!std::is_member_pointer<typename std::decay<F>::type>::value, int>::type = 0
    >
    constexpr auto invoke(F&& f, Args&&... args)
    INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
        std::forward<F>(f)(std::forward<Args>(args)...))

    template
    <
        typename F, typename T,
        typename std::enable_if<std::is_member_object_pointer<typename std::decay<F>::type>::value, int>::type = 0
    >
    constexpr auto invoke(F&& f, T&& t)
    INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
        impl::invoke_member_object_impl(std::forward<F>(f), std::forward<T>(t)))

    template
    <
        typename F, typename... Args,
        typename std::enable_if<std::is_member_function_pointer<typename std::decay<F>::type>::value, int>::type = 0
    >
    constexpr auto invoke(F&& f, Args&&... args)
    INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
        impl::invoke_member_function_impl(std::forward<F>(f), std::forward<Args>(args)...))
}

//
// invoke_result
//

namespace invoke_hpp
{
    namespace impl
    {
        struct invoke_result_impl_tag {};

        template < typename Void, typename F, typename... Args >
        struct invoke_result_impl {};

        template < typename F, typename... Args >
        struct invoke_result_impl<void_t<invoke_result_impl_tag, decltype(invoke_hpp::invoke(std::declval<F>(), std::declval<Args>()...))>, F, Args...> {
            using type = decltype(invoke_hpp::invoke(std::declval<F>(), std::declval<Args>()...));
        };
    }

    template < typename F, typename... Args >
    struct invoke_result
    : impl::invoke_result_impl<void, F, Args...> {};

    template < typename F, typename... Args >
    using invoke_result_t = typename invoke_result<F, Args...>::type;
}

//
// is_invocable
//

namespace invoke_hpp
{
    namespace impl
    {
        struct is_invocable_r_impl_tag {};

        template < typename Void, typename R, typename F, typename... Args >
        struct is_invocable_r_impl
        : std::false_type {};

        template < typename R, typename F, typename... Args >
        struct is_invocable_r_impl<void_t<is_invocable_r_impl_tag, invoke_result_t<F, Args...>>, R, F, Args...>
        : std::conditional<
            std::is_void<R>::value,
            std::true_type,
            std::is_convertible<invoke_result_t<F, Args...>, R>>::type {};
    }

    template < typename R, typename F, typename... Args >
    struct is_invocable_r
    : impl::is_invocable_r_impl<void, R, F, Args...> {};

    template < typename F, typename... Args >
    using is_invocable = is_invocable_r<void, F, Args...>;
}

//
// apply
//

namespace invoke_hpp
{
    namespace impl
    {
        template < typename F, typename Tuple, std::size_t... I >
        constexpr auto apply_impl(F&& f, Tuple&& args, index_sequence<I...>)
        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
            invoke_hpp::invoke(
                std::forward<F>(f),
                std::get<I>(std::forward<Tuple>(args))...))
    }

    template < typename F, typename Tuple >
    constexpr auto apply(F&& f, Tuple&& args)
    INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
        impl::apply_impl(
            std::forward<F>(f),
            std::forward<Tuple>(args),
            make_index_sequence<std::tuple_size<typename std::decay<Tuple>::type>::value>()))
}

#undef INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN
