SceneManager.h

#ifndef SceneManager_H
#define SceneManager_H
 
#include "AzulCore.h"
 
class Scene;
class Camera;
class SceneChangeStrategy;
class Terrain;

class SceneManager
{
private:
    friend class SceneAttorney;
    static SceneManager* ptrInstance;
 
    SceneManager();
    SceneManager(const SceneManager&) = delete;
    SceneManager& operator=(const SceneManager&) = delete;
    ~SceneManager() = default;
 
    static SceneManager& Instance()
    {
        if (ptrInstance == nullptr)
            ptrInstance = new SceneManager();
        return *ptrInstance;
    };

    Scene* CurrentScene;

    Scene* DefaultScene;

    Scene* PrevScene;

    SceneChangeStrategy* pSceneChangeStrategy;
 
    void privInitializeScene();
    void privDraw();
    void privUpdate();
    void privEndScene();
private:
    friend class SceneAttorney;

    static void Delete();

    static void InitializeScene() { Instance().privInitializeScene(); }

    static void UpdateScene() { Instance().privUpdate(); }

    static void DrawScene() { Instance().privDraw(); }

    static void EndScene() { Instance().privEndScene(); }

    static void SetCurrentScene(Scene* scene) { Instance().CurrentScene = scene; }

    static void ChangeScene(Scene* scene);
 
public:
    static Scene* GetCurrentScene();

    static void SetNextScene(Scene* scene);

    static Camera* GetCurrentCamera();

    static void SetCurrentCamera(Camera* cam);

    static Camera* GetCurrentCamera2D();

    static void SetCurrentCamera2D(Camera* cam);

    static Terrain* GetTerrain();
};
 
#endif