Fix REntityServer click listener

SpigotCore_Main/src/de/steamwar/entity/REntityServer.java

@@ -47,8 +47,17 @@ public class REntityServer implements Listener {
     private static final HashSet<Player> emptyPlayers = new HashSet<>(0);
 
     private static final Class<?> useEntity = Reflection.getClass("{nms.network.protocol.game}.PacketPlayInUseEntity");
+    private static final Class<?> useEntityEnumAction = Reflection.getClass("{nms.network.protocol.game}.PacketPlayInUseEntity$EnumEntityUseAction");
     private static final Reflection.FieldAccessor<Integer> useEntityTarget = Reflection.getField(useEntity, int.class, 0);
-    private static final Reflection.FieldAccessor<Integer> useEntityAction = Reflection.getField(useEntity, int.class, 1);
+    private static final Reflection.FieldAccessor<Object> useEntityAction = (Reflection.FieldAccessor<Object>) Reflection.getField(useEntity, useEntityEnumAction, 0);
+    private static final Reflection.MethodInvoker useEntityGetAction;
+    static {
+        if (useEntityEnumAction.isEnum()) {
+            useEntityGetAction = null;
+        } else {
+            useEntityGetAction = Reflection.getMethod(useEntity, "a");
+        }
+    }
 
     private final ConcurrentHashMap<Integer, REntity> entityMap = new ConcurrentHashMap<>();
     private final HashMap<Long, HashSet<REntity>> entities = new HashMap<>();
@@ -64,7 +73,15 @@ public class REntityServer implements Listener {
         REntity entity = entityMap.get(target);
         if (entity == null) return packet;
 
-        EntityAction action = useEntityAction.get(packet) == 1 ? EntityAction.ATTACK : EntityAction.INTERACT;
+        Object entityAction = useEntityAction.get(packet);
+        int entityActionOrdinal;
+        if (useEntityEnumAction.isEnum()) {
+            entityActionOrdinal = ((Enum<?>) entityAction).ordinal();
+        } else {
+            entityActionOrdinal = ((Enum<?>) useEntityGetAction.invoke(entityAction)).ordinal();
+        }
+
+        EntityAction action = entityActionOrdinal == 1 ? EntityAction.ATTACK : EntityAction.INTERACT;
         Bukkit.getScheduler().runTask(Core.getInstance(), () -> {
             callback.onAction(player, entity, action);
         });