system_service.h

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#pragma once
 
#include <functional>
#include <memory>
#include <string>
#include <unordered_map>
 
#include "engine/core/events/system_event.h"
#include "engine/core/iEngineService.h"
#include "engine/core/system/i_backend_system.h"
 
class SystemService : public IEngineService {
 public:
  explicit SystemService();
 
  using EventCallback = std::function<void(void* event)>;
 
  int add_listener(SystemEvent event, EventCallback callback);  // NOLINT
  void remove_listener(SystemEvent event, int listener_id);     // NOLINT
 
  void update();
 
  [[nodiscard]] std::string get_clipboard_text();
 
  void set_cursor_to_arrow();
  void set_cursor_to_hand();
  void set_cursor_to_ibeam();
  void set_cursor_to_crosshair();
  void set_cursor_to_wait();
 
  void init_frame_timer();
  void update_frame_time(float time_scale);
  [[nodiscard]] float delta_time() const;
  [[nodiscard]] float frames_per_second() const;
 
 private:
  std::unique_ptr<IBackendSystem> backend_system_;
  std::unordered_map<SystemEvent, std::vector<EventCallback>> listeners_;
};