Add parts and messages

16_Bug/csharp/Parts/Body.cs

@@ -0,0 +1,25 @@
+using BugGame.Resources;
+
+namespace BugGame.Parts;
+
+internal class Body : ParentPart
+{
+    private readonly Neck _neck = new();
+    private readonly Tail _tail = new();
+    private readonly Legs _legs = new();
+
+    public Body()
+        : base(Message.BodyAdded, Message.BodyNotNeeded)
+    {
+    }
+
+    protected override bool TryAddCore(IPart part, out Message message)
+        => part switch
+        {
+            Neck => _neck.TryAdd(out message),
+            Head or Feeler => _neck.TryAdd(part, out message),
+            Tail => _tail.TryAdd(out message),
+            Leg => _legs.TryAddOne(out message),
+            _ => throw new NotSupportedException($"Can't add a {part.Name} to a {Name}.")
+        };
+}