// 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.
#ifndef FTXUI_COMPONENT_SCREEN_INTERACTIVE_HPP
#define FTXUI_COMPONENT_SCREEN_INTERACTIVE_HPP

#include <atomic>                        // for atomic
#include <ftxui/component/receiver.hpp>  // for Receiver, Sender
#include <functional>                    // for function
#include <memory>                        // for shared_ptr
#include <string>                        // for string
#include <thread>                        // for thread
#include <variant>                       // for variant

#include <ftxui/component/animation.hpp>       // for TimePoint
#include <ftxui/component/captured_mouse.hpp>  // for CapturedMouse
#include <ftxui/component/event.hpp>           // for Event
#include <ftxui/component/task.hpp>            // for Task, Closure
#include <ftxui/screen/screen.hpp>             // for Screen

using ftxui::Component, ftxui::Task, ftxui::Closure, ftxui::Event, ftxui::Sender, ftxui::Receiver;

namespace ftxui {
  class ComponentBase;
  struct Event;

  using Component = std::shared_ptr<ComponentBase>;
  class SFMLScreenPrivate;
}

class SFMLScreen : public ftxui::Screen {
 public:
  // Constructors:
  static SFMLScreen FixedSize(int dimx, int dimy);
  static SFMLScreen Fullscreen();
  static SFMLScreen FitComponent();
  static SFMLScreen TerminalOutput();

  // Options. Must be called before Loop().
  void TrackMouse(bool enable = true);

  // Return the currently active screen, nullptr if none.
  static SFMLScreen* Active();

  // Start/Stop the main loop.
  void Exit();
  Closure ExitLoopClosure();

  // Post tasks to be executed by the loop.
  void Post(Task task);
  void PostEvent(Event event);
  void RequestAnimationFrame();

  // Decorate a function. The outputted one will execute similarly to the
  // inputted one, but with the currently active screen terminal hooks
  // temporarily uninstalled.
  ftxui::Closure WithRestoredIO(ftxui::Closure);

  void ExitNow();

  void Install();
  void Uninstall();

  void PreMain();
  void PostMain();

  bool HasQuitted();
  void RunOnce(Component component);
  void RunOnceBlocking(Component component);

  void HandleTask(Component component, Task& task);
  void Draw(Component component);
  void ResetCursorPosition();

  SFMLScreen* suspended_screen_ = nullptr;
  enum class Dimension {
    FitComponent,
    Fixed,
    Fullscreen,
    TerminalOutput,
  };
  Dimension dimension_ = Dimension::Fixed;
  bool use_alternative_screen_ = false;

  SFMLScreen(int dimx,
                    int dimy,
                    Dimension dimension,
                    bool use_alternative_screen);

  bool track_mouse_ = true;

  Sender<Task> task_sender_;
  Receiver<Task> task_receiver_;

  std::string set_cursor_position;
  std::string reset_cursor_position;

  std::thread event_listener_;
  std::thread animation_listener_;
  bool animation_requested_ = false;
  ftxui::animation::TimePoint previous_animation_time_;

  int cursor_x_ = 1;
  int cursor_y_ = 1;

  bool mouse_captured = false;
  bool previous_frame_resized_ = false;

  bool frame_valid_ = false;
};


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