/// \file
// Range v3 library
//
//  Copyright Andrey Diduh 2019
//
//  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)
//
// Project home: https://github.com/ericniebler/range-v3
//

#ifndef RANGES_V3_VIEW_REMOVE_HPP
#define RANGES_V3_VIEW_REMOVE_HPP

#include <type_traits>
#include <utility>

#include <meta/meta.hpp>

#include <concepts/concepts.hpp>

#include <range/v3/range_fwd.hpp>

#include <range/v3/functional/bind_back.hpp>
#include <range/v3/functional/comparisons.hpp>
#include <range/v3/functional/pipeable.hpp>
#include <range/v3/view/remove_if.hpp>
#include <range/v3/view/view.hpp>

namespace ranges
{
    /// \addtogroup group-views
    /// @{
    namespace views
    {
        struct remove_fn
        {
        private:
            friend view_access;

            template<typename Value>
            static constexpr auto bind(remove_fn remove, Value value)
            {
                return make_pipeable(bind_back(remove, std::move(value)));
            }
            template<typename Value, typename Proj>
            static constexpr auto CPP_fun(bind)(remove_fn remove, Value value,
                                                Proj proj)( //
                requires(!range<Value>))
            {
                return make_pipeable(
                    bind_back(remove, std::move(value), std::move(proj)));
            }

            template<typename Value>
            struct pred
            {
                Value value_;
                template<typename T>
                auto operator()(T && other) const -> CPP_ret(bool)( //
                    requires equality_comparable_with<T, Value const &>)
                {
                    return static_cast<T &&>(other) == value_;
                }
            };

        public:
            template<typename Rng, typename Value>
            constexpr auto CPP_fun(operator())(Rng && rng, Value value)(
                const requires move_constructible<Value> && viewable_range<Rng> &&
                    input_range<Rng> &&
                        indirectly_comparable<iterator_t<Rng>, Value const *, equal_to>)
            {
                return remove_if(static_cast<Rng &&>(rng), pred<Value>{std::move(value)});
            }

            template<typename Rng, typename Value, typename Proj>
            constexpr auto CPP_fun(operator())(Rng && rng, Value value, Proj proj)(
                const requires move_constructible<Value> && viewable_range<Rng> &&
                    input_range<Rng> && indirectly_comparable<
                        iterator_t<Rng>, Value const *, equal_to, Proj>)
            {
                return remove_if(static_cast<Rng &&>(rng),
                                 pred<Value>{std::move(value)},
                                 std::move(proj));
            }
        };

        /// \relates remove_fn
        /// \ingroup group-views
        RANGES_INLINE_VARIABLE(view<remove_fn>, remove)
    } // namespace views
    /// @}
} // namespace ranges

#endif // RANGES_V3_VIEW_REMOVE_HPP