From 1cca911153c1d9c2afa45082ad63d9753ef6b33b Mon Sep 17 00:00:00 2001
From: yoyosource <yoyosource@nidido.de>
Date: Fri, 25 Mar 2022 23:11:35 +0100
Subject: [PATCH] Implement skinparts (not working)

---
 src/de/steamwar/lobby/display/NPC.java | 42 +++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/src/de/steamwar/lobby/display/NPC.java b/src/de/steamwar/lobby/display/NPC.java
index 8e0e6e5..9907f16 100644
--- a/src/de/steamwar/lobby/display/NPC.java
+++ b/src/de/steamwar/lobby/display/NPC.java
@@ -22,11 +22,12 @@ package de.steamwar.lobby.display;
 import com.comphenix.tinyprotocol.Reflection;
 import com.comphenix.tinyprotocol.TinyProtocol;
 import com.mojang.authlib.GameProfile;
-import de.steamwar.lobby.LobbySystem;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.entity.Player;
 
+import java.lang.reflect.Field;
+import java.lang.reflect.ParameterizedType;
 import java.util.Collections;
 import java.util.List;
 import java.util.UUID;
@@ -74,6 +75,41 @@ public class NPC {
     private static final Reflection.FieldAccessor<Byte> movePacketPitch = Reflection.getField(movePacket, byte.class, 1);
     private static final Reflection.FieldAccessor<Boolean> movePacketOnGround = Reflection.getField(movePacket, boolean.class, 0);
 
+    private static final Class<?> dataWatcherObject = Reflection.getClass("{nms.network.syncher}.DataWatcherObject");
+    private static final Class<?> dataWatcherRegistry = Reflection.getClass("{nms.network.syncher}.DataWatcherRegistry");
+    private static final Class<?> dataWatcherSerializer = Reflection.getClass("{nms.network.syncher}.DataWatcherSerializer");
+    private static final Reflection.ConstructorInvoker dataWatcherObjectConstructor = Reflection.getConstructor(dataWatcherObject, int.class, dataWatcherSerializer);
+    private static Object getDataWatcherObject(int index, Class<?> type) {
+        for(Field field : dataWatcherRegistry.getFields()) {
+            if(dataWatcherSerializer.isAssignableFrom(field.getType()) && type.equals(((ParameterizedType) field.getGenericType()).getActualTypeArguments()[0])) {
+                try {
+                    return dataWatcherObjectConstructor.invoke(index, field.get(null));
+                } catch (IllegalAccessException e) {
+                    throw new SecurityException("Could not get field", e);
+                }
+            }
+        }
+        throw new SecurityException("Could not find Serializer for " + type.getName());
+    }
+
+    private static final Class<?> item = Reflection.getClass("{nms.network.syncher}.DataWatcher$Item");
+    private static final Reflection.ConstructorInvoker itemConstructor = Reflection.getConstructor(item, dataWatcherObject, Object.class);
+    private static Object getDataWatcherItem(Object dwo, Object value) {
+        return itemConstructor.invoke(dwo, value);
+    }
+
+    private static final Class<?> metadataPacket = Reflection.getClass("{nms.network.protocol.game}.PacketPlayOutEntityMetadata");
+    private static final Reflection.FieldAccessor<Integer> metadataEntity = Reflection.getField(metadataPacket, int.class, 0);
+    private static final Reflection.FieldAccessor<List> metadataMetadata = Reflection.getField(metadataPacket, List.class, 0);
+    private Object getDataWatcherPacket(Object dataWatcherObject, Object value) {
+        Object packet = Reflection.newInstance(metadataPacket);
+        metadataEntity.set(packet, entityId);
+        metadataMetadata.set(packet, Collections.singletonList(getDataWatcherItem(dataWatcherObject, value)));
+        return packet;
+    }
+
+    private static Object skinPartsDataWatcherObject = getDataWatcherObject(17, Byte.class);
+
     private final Displayable display;
 
     private final int entityId;
@@ -83,6 +119,7 @@ public class NPC {
 
     private final Object addPlayerInfo;
     private final Object namedSpawn;
+    private final Object skinParts;
     private final Object headRotation;
     private final Object removePlayerInfo;
     private final Object destroy;
@@ -100,6 +137,8 @@ public class NPC {
         removePlayerInfo = playerInfoPacket(removePlayer, profile);
         destroy = Hologram.destroyPacket(entityId);
 
+        skinParts = getDataWatcherPacket(skinPartsDataWatcherObject, (byte) 0xFF);
+
         namedSpawn = namedSpawnConstructor.invoke();
         namedSpawnEntity.set(namedSpawn, entityId);
         namedSpawnUUID.set(namedSpawn, uuid);
@@ -142,6 +181,7 @@ public class NPC {
         TinyProtocol.instance.sendPacket(player, addPlayerInfo);
         TinyProtocol.instance.sendPacket(player, namedSpawn);
         TinyProtocol.instance.sendPacket(player, headRotation);
+        TinyProtocol.instance.sendPacket(player, skinParts);
     }
 
     private void hide(Player player) {