doesnt work

src/gmon/src/battle.rs

@@ -1,7 +1,26 @@
 use ::mon::*;
+use godot::classes::{ISprite2D, Sprite2D};
+use godot::prelude::*;
 
 pub type Instance = mon::battle::Instance;
-pub type Engine = mon::battle::Engine;
 pub type Team = mon::battle::Team;
 pub type Event = mon::battle::Event;
 pub type Move = mon::battle::Move;
+
+#[derive(GodotClass)]
+#[class(base=Sprite2D)]
+struct Engine {
+    instance: mon::battle::Engine,
+
+    base: Base<Sprite2D>,
+}
+
+#[godot_api]
+impl ISprite2D for Engine {
+    fn init(base: Base<Sprite2D>) -> Self {
+        Self {
+            instance: mon::battle::Engine::new(),
+            base: base,
+        }
+    }
+}