SceneManager.h

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#pragma once
#include "../Core/Core.h"
 
namespace Shit {
    class Scene; // 前向声明

    class SHIT_API SceneManager final {
    public:
 
        // 禁止拷贝和移动
        SceneManager(const SceneManager&) = delete;
        SceneManager& operator=(const SceneManager&) = delete;
        SceneManager(SceneManager&&) = delete;
        SceneManager& operator=(SceneManager&&) = delete;
 
        // --- 静态API ---
        static SceneManager& GetInstance();
        inline static void Update() { GetInstance().update(); }                    
        inline static void Destroy() { GetInstance().destroy(); }                  
        inline static void PushScene(std::unique_ptr<Scene>&& scene) { GetInstance().pushScene(std::move(scene)); }       
        inline static void PopScene() { GetInstance().popScene(); }                
        inline static void ClearScene() { GetInstance().clearScene(); }            
        inline static void ReplaceScene(std::unique_ptr<Scene>&& scene) { GetInstance().replaceScene(std::move(scene)); } 
 
    private:
        explicit SceneManager();
        ~SceneManager();
 
        void pushScene(std::unique_ptr<Scene>&& scene);
        void popScene();
        void clearScene();
        void replaceScene(std::unique_ptr<Scene>&& scene);
 
        void update();
        void destroy();
 
        void processPendingActions();
        void processPushScene(std::unique_ptr<Scene>&& scene);
        void processPopScene();
        void processClearScene();
        void processReplaceScene(std::unique_ptr<Scene>&& scene);
 
        Scene* getCurrentScene() const;
 
        enum class StackAction { None, Push, Pop, Clear, Replace };
        struct PendingAction {
            StackAction action;
            std::unique_ptr<Scene> scene;
        };
 
        std::vector<std::unique_ptr<Scene>> m_sceneStack;
        std::vector<PendingAction> m_pendingActions;
    };
}