namespace Sandbox.Transposer;

/// <summary>
/// Manages switching between the MainMenu and Game scenes.
/// Holds both scene instances and delegates update calls to the active one.
/// </summary>
public class TransposerSceneManager
{
	private readonly Dictionary<SceneType, TransposerScene> _scenes = new();
	private TransposerScene _currentScene;
	private SceneType _currentSceneType;

	public TransposerScene CurrentScene => _currentScene;
	public SceneType CurrentSceneType => _currentSceneType;

	public TransposerSceneManager()
	{
		GameScene gameScene = new();
		gameScene.SceneManager = this;
		_scenes[SceneType.Game] = gameScene;

		MainMenuScene menuScene = new();
		menuScene.SceneManager = this;
		_scenes[SceneType.MainMenu] = menuScene;
	}

	/// <summary>
	/// Start the game by activating the MainMenu scene.
	/// </summary>
	public void Begin()
	{
		SetScene( SceneType.MainMenu );
	}

	/// <summary>
	/// Deactivate the current scene and activate the new one.
	/// </summary>
	public void SetScene( SceneType sceneType )
	{
		if ( !_scenes.TryGetValue( sceneType, out TransposerScene scene ) )
		{
			Log.Error( $"TransposerSceneManager: no scene of type {sceneType}" );
			return;
		}

		_currentScene?.Deactivate();
		_currentScene = scene;
		_currentSceneType = sceneType;
		_currentScene.Activate();
	}

	/// <summary>
	/// Tick the active scene. Call once per frame after input polling.
	/// </summary>
	public void Update( float deltaTime )
	{
		_currentScene?.UpdateScene( deltaTime );
	}
}