namespace Engine.Scene;

public class SceneManager : IUpdate, IRender
{
  public Scene? CurrentScene { get; private set; }

  private Func<Scene>? _nextScene;

  public void Update(double parDeltaTime)
  {
    if (_nextScene != null)
    {
      CurrentScene?.Exit();
      CurrentScene = _nextScene();
      _nextScene = null;
      CurrentScene.Enter();
    }

    if (parDeltaTime != 0)
    {
      CurrentScene?.Update(parDeltaTime);
    }
  }

  public void Render()
  {
    CurrentScene?.Render();
  }

  public void TransitionTo(Func<Scene>? parScene)
  {
    _nextScene = parScene;
  }
}