scene_service.h

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#pragma once
 
#include <engine/core/iEngineService.h>
#include <engine/public/scene.h>
 
#include <map>
#include <memory>
#include <set>
 
class SceneService final : public IEngineService {
 private:
  std::map<const std::string, std::unique_ptr<Scene>> scenes_;
  void move_dont_destroy_on_load_objects(Scene& next_scene) const;
 
  std::optional<std::reference_wrapper<Scene>> current_scene_;
  std::optional<std::string> next_scene_name_;
  std::string fallback_scene_name_ = DEFAULT_SCENE_NAME;
  bool is_running_;
 
 public:
  static constexpr auto DEFAULT_SCENE_NAME = "DefaultScene";
 
  SceneService();
  explicit SceneService(const std::string& initial_scene_name);
  SceneService(const SceneService&) = delete;
  SceneService& operator=(const SceneService&) = delete;
  ~SceneService() override;
 
  void run_current();
  bool is_running() const;
  void stop();
 
  Scene& add_scene(const std::string& name);
 
  SceneService& load_scene(const std::string& name);
 
  SceneService& add_scene_and_load(const std::string& name);
 
  SceneService& remove_scene(const std::string& name);
 
  [[nodiscard]] std::set<std::string> contained_scene_names() const;
 
  [[nodiscard]] Scene& current_scene() const;
 
  SceneService& set_fallback_scene(const std::string& name);
 
  [[nodiscard]] const std::string& fallback_scene() const;
};