#ifndef FTXUI_COMPONENT_CHECKBOX_HPP
#define FTXUI_COMPONENT_CHECKBOX_HPP

#include <functional>  // for function
#include <string>      // for wstring, allocator

#include "ftxui/component/component.hpp"       // for Component
#include "ftxui/component/component_base.hpp"  // for ComponentBase
#include "ftxui/dom/elements.hpp"  // for Element, Decorator, inverted, nothing
#include "ftxui/screen/box.hpp"    // for Box

namespace ftxui {
struct Event;

/// @brief A Checkbox. It can be checked or unchecked.Display an element on a
/// ftxui::Screen.
/// @ingroup dom
class CheckboxBase : public ComponentBase {
 public:
  // Access this interface from a Component
  static CheckboxBase* From(Component component);

  // Constructor.
  CheckboxBase(const std::wstring* label, bool* state);
  ~CheckboxBase() override = default;

#if defined(_WIN32)
  std::wstring checked = L"[X] ";    /// Prefix for  a "checked" state.
  std::wstring unchecked = L"[ ] ";  /// Prefix for  an "unchecked" state.
#else
  std::wstring checked = L"▣ ";    /// Prefix for  a "checked" state.
  std::wstring unchecked = L"☐ ";  /// Prefix for  a "unchecked" state.
#endif

  Decorator focused_style = inverted;   /// Decorator used when focused.
  Decorator unfocused_style = nothing;  /// Decorator used when unfocused.

  /// Called when the user change the state of the CheckboxBase.
  std::function<void()> on_change = []() {};

  // Component implementation.
  Element Render() override;
  bool OnEvent(Event) override;

 private:
  bool OnMouseEvent(Event event);

  const std::wstring* const label_;
  bool* const state_;
  int cursor_position = 0;
  Box box_;
};

}  // namespace ftxui

#endif /* end of include guard: FTXUI_COMPONENT_CHECKBOX_HPP */

// Copyright 2020 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.