/////////////////////////////////////////////////////////
/// Pops a Scene off from the stack
/////////////////////////////////////////////////////////
void SceneManager::popScene()
{
    if(scenes.size() > 0)
    {
        Debugger &debugger = Debugger::GetSharedInstance();

        if(currentScene != 0)
        {
            debugger.log("Releasing Scene: " + std::string(typeid(*currentScene).name()));

            currentScene->sceneWillBePoppedOff(); // notify the scene
            currentScene->release(); // release any memory that the scene may contain.
            delete currentScene;

            debugger.log("Popping off Scene: " + std::string(typeid(*currentScene).name()));
        }

        scenes.pop(); // HERE IS EXCEPTION!!

        if(scenes.size() > 0)
        {
            setCurrentScene(scenes.top());
        }
        else
        {
            setCurrentScene(0);
        }
    }
}


/////////////////////////////////////////////////////////
/// Pops of every Scene in the SceneManager.
/////////////////////////////////////////////////////////
void SceneManager::popAllScenes()
{
    while(!scenes.empty())
    {
        popScene();
    }
}


/////////////////////////////////////////////////////////
/// Pushes a Scene off from the Stack.
/// \param scene A pointer to a Scene, this must be allocated from the heap.
/////////////////////////////////////////////////////////
void SceneManager::pushScene(Scene *scene)
{
    if(scene == 0)
    {
        throw AnaxNullPointerDereferenceException(__FUNCTION__);
    }

    // Since all priorities push on the stack... Won't push in the switch case
    switch(scene->getPriorityLevel())
    {
        /// A <i>Low</i> priority implies that the last Scene will be <i>kept</i> on the Stack
        /// and this Scene will be pushed on.
    case Priority::Low:
        break;

        /// A <i>Medium</i> priority implies that only the last Scene on the stack should be popped off and this
        /// Scene pushed on.
    case Priority::Medium:
        popScene(); // Pop the current scene
        break;

        /// A <i>High</i> priority implies that all the Scene's on the stack should be popped off
        /// and this Scene will be pushed on.
    case Priority::High:
        // Pop of all the scenes
        popAllScenes();
        break;
    }

    // Instead we'll push here
    scenes.push(scene);
    setCurrentScene(scenes.top());



    Debugger::GetSharedInstance().log("Starting up Current Scene: " + std::string(typeid(*currentScene).name()));

    // Setup the Scene
    currentScene->start();
}