#include <string>   // for string
#include <utility>  // for move

#include "ftxui/component/component.hpp"  // for Checkbox, Maybe, Make, Vertical, Collapsible
#include "ftxui/component/component_base.hpp"  // for Component, ComponentBase
#include "ftxui/component/component_options.hpp"  // for CheckboxOption
#include "ftxui/util/ref.hpp"                     // for Ref, ConstStringRef

namespace ftxui {

/// @brief A collapsible component. It display a checkbox with an arrow. Once
/// activated, the children is displayed.
/// @params label The label of the checkbox.
/// @params child The children to display.
/// @params show Hold the state about whether the children is displayed or not.
///
/// ### Example
/// ```cpp
/// auto component = Collapsible("Show details", details);
/// ```
///
/// ### Output
/// ```
///
/// ▼ Show details
/// <details component>
/// ```
Component Collapsible(ConstStringRef label, Component child, Ref<bool> show) {
  class Impl : public ComponentBase {
   public:
    Impl(ConstStringRef label, Component child, Ref<bool> show)
        : show_(std::move(show)) {
      CheckboxOption opt;
      opt.transform = [](EntryState s) {
        auto prefix = text(s.state ? "▼ " : "▶ ");
        auto t = text(s.label);
        if (s.active)
          t |= bold;
        if (s.focused)
          t |= inverted;
        return hbox({prefix, t});
      };
      Add(Container::Vertical({
          Checkbox(label, show_.operator->(), opt),
          Maybe(std::move(child), show_.operator->()),
      }));
    }
    Ref<bool> show_;
  };

  return Make<Impl>(label, std::move(child), std::move(show));
}

}  // namespace ftxui

// Copyright 2021 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.