/******************************************************************************
 *                       ____    _    _____                                   *
 *                      / ___|  / \  |  ___|    C++                           *
 *                     | |     / _ \ | |_       Actor                         *
 *                     | |___ / ___ \|  _|      Framework                     *
 *                      \____/_/   \_|_|                                      *
 *                                                                            *
 * Copyright 2011-2019 Dominik Charousset                                     *
 *                                                                            *
 * Distributed under the terms and conditions of the BSD 3-Clause License or  *
 * (at your option) under the terms and conditions of the Boost Software      *
 * License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE.       *
 *                                                                            *
 * If you did not receive a copy of the license files, see                    *
 * http://opensource.org/licenses/BSD-3-Clause and                            *
 * http://www.boost.org/LICENSE_1_0.txt.                                      *
 ******************************************************************************/

#pragma once

#include <cstddef>
#include <tuple>

#include "caf/config_value.hpp"
#include "caf/config_value_adaptor_field.hpp"
#include "caf/config_value_field.hpp"
#include "caf/detail/config_value_field_base.hpp"
#include "caf/string_view.hpp"

namespace caf {
namespace detail {

template <class T, size_t Pos>
class config_value_adaptor_field_impl
  : public config_value_field_base<T,
                                   typename std::tuple_element<Pos, T>::type> {
public:
  using object_type = T;

  using value_type = typename std::tuple_element<Pos, T>::type;

  using field_type = config_value_adaptor_field<value_type>;

  using predicate_type = bool (*)(const value_type&);

  using super = config_value_field_base<object_type, value_type>;

  explicit config_value_adaptor_field_impl(field_type x)
    : super(x.name, std::move(x.default_value), x.predicate) {
    // nop
  }

  config_value_adaptor_field_impl(config_value_adaptor_field_impl&&) = default;

  const value_type& get_value(const object_type& x) const override {
    return std::get<Pos>(x);
  }

  void set_value(object_type& x, value_type y) const override {
    std::get<Pos>(x) = std::move(y);
  }
};

template <class T, class Ps>
struct select_adaptor_fields;

template <class T, long... Pos>
struct select_adaptor_fields<T, detail::int_list<Pos...>> {
  using type = std::tuple<config_value_adaptor_field_impl<T, Pos>...>;
};

} // namespace detail
} // namespace caf
