Rework enemy behavior (still in progress but shouldn't crash)

Zennysoft.Game.Ma/src/enemy/Enemy2D.cs

@@ -0,0 +1,48 @@
+using Chickensoft.AutoInject;
+using Chickensoft.Introspection;
+using Godot;
+using Zennysoft.Ma.Adapter;
+
+namespace Zennysoft.Game.Ma;
+
+[Meta(typeof(IAutoNode))]
+public abstract partial class Enemy2D : Enemy
+{
+  public override void _Notification(int what) => this.Notify(what);
+
+  public override IEnemyModelView EnemyModelView => _enemyModelView;
+
+  [Node] private EnemyModelView2D _enemyModelView { get; set; } = default!;
+
+  public override void _PhysicsProcess(double delta)
+  {
+    _enemyModelView.SetCurrentDirection(GlobalBasis, -_player.CurrentBasis.Z);
+  }
+
+  protected void PlayerDetector_BodyEntered(Node3D node)
+  {
+    if (node is IPlayer)
+      _enemyLogic.Input(new EnemyLogic.Input.ReachedPlayer());
+  }
+
+  protected void PlayerDetector_BodyExited(Node3D node)
+  {
+    if (node is IPlayer)
+      _enemyLogic.Input(new EnemyLogic.Input.Follow());
+  }
+
+  protected void OnVelocityComputed(Vector3 safeVelocity)
+  {
+    Velocity = safeVelocity;
+    LookAtTarget(safeVelocity);
+    if (Velocity > Vector3.Zero)
+      _enemyLogic.Input(new EnemyLogic.Input.Move());
+    else
+      _enemyLogic.Input(new EnemyLogic.Input.Idle());
+    MoveAndSlide();
+  }
+
+  protected void EngagePlayerBehavior_TakeAction() => EnemyModelView.PlayPrimaryAttackAnimation();
+
+  protected void EngagePlayerBehavior_AcquireTarget() => LookAt(new Vector3(_player.CurrentPosition.X, GlobalPosition.Y, _player.CurrentPosition.Z), Vector3.Up, true);
+}