From 278b4462f3be8f9b89a415e7e79370c52b3dffef Mon Sep 17 00:00:00 2001
From: Flowsqy <47575244+Flowsqy@users.noreply.github.com>
Date: Wed, 29 Dec 2021 16:34:05 +0100
Subject: [PATCH] Add FakeItem implementation

---
 .../de/epiceric/shopchest/nms/FakeItem.java   |  2 ++
 .../shopchest/nms/v1_17_R1/FakeItemImpl.java  | 28 +++++++++++++++++--
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/nms/interface/src/main/java/de/epiceric/shopchest/nms/FakeItem.java b/nms/interface/src/main/java/de/epiceric/shopchest/nms/FakeItem.java
index 9e5b1c8..d1eeda2 100644
--- a/nms/interface/src/main/java/de/epiceric/shopchest/nms/FakeItem.java
+++ b/nms/interface/src/main/java/de/epiceric/shopchest/nms/FakeItem.java
@@ -7,4 +7,6 @@ public interface FakeItem extends FakeEntity{
 
     void sendData(ItemStack item, Iterable<Player> receivers);
 
+    void resetVelocity(Iterable<Player> receivers);
+
 }
diff --git a/nms/v1_17_R1/src/main/java/de/epiceric/shopchest/nms/v1_17_R1/FakeItemImpl.java b/nms/v1_17_R1/src/main/java/de/epiceric/shopchest/nms/v1_17_R1/FakeItemImpl.java
index d09c7f0..f21cdcf 100644
--- a/nms/v1_17_R1/src/main/java/de/epiceric/shopchest/nms/v1_17_R1/FakeItemImpl.java
+++ b/nms/v1_17_R1/src/main/java/de/epiceric/shopchest/nms/v1_17_R1/FakeItemImpl.java
@@ -1,22 +1,46 @@
 package de.epiceric.shopchest.nms.v1_17_R1;
 
 import de.epiceric.shopchest.nms.FakeItem;
+import net.minecraft.network.protocol.game.ClientboundSetEntityMotionPacket;
+import net.minecraft.network.syncher.EntityDataAccessor;
 import net.minecraft.network.syncher.SynchedEntityData;
 import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.item.ItemEntity;
+import net.minecraft.world.phys.Vec3;
+import org.bukkit.craftbukkit.v1_17_R1.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
+import java.lang.reflect.Field;
 import java.util.List;
 
 public class FakeItemImpl extends FakeEntityImpl<ItemStack> implements FakeItem {
 
+    private final static EntityDataAccessor<net.minecraft.world.item.ItemStack> DATA_ITEM;
+
+    static {
+        try{
+            final Field dataItemField = ItemEntity.class.getDeclaredField("c"); // DATA_ITEM
+            dataItemField.setAccessible(true);
+            DATA_ITEM = forceCast(dataItemField.get(null));
+        }catch (ReflectiveOperationException e){
+            throw new RuntimeException(e);
+        }
+    }
+
     public FakeItemImpl() {
         super();
     }
 
     @Override
     public void sendData(ItemStack item, Iterable<Player> receivers) {
+        sendData(receivers, item);
+    }
 
+    @Override
+    public void resetVelocity(Iterable<Player> receivers) {
+        final ClientboundSetEntityMotionPacket velocityPacket = new ClientboundSetEntityMotionPacket(entityId, Vec3.ZERO);
+        sendPacket(velocityPacket, receivers);
     }
 
     @Override
@@ -26,11 +50,11 @@ public class FakeItemImpl extends FakeEntityImpl<ItemStack> implements FakeItem
 
     @Override
     protected int getDataItemCount() {
-        return 0;
+        return 1;
     }
 
     @Override
     protected void addSpecificData(List<SynchedEntityData.DataItem<?>> packedItems, ItemStack data) {
-
+        packedItems.add(new SynchedEntityData.DataItem<>(DATA_ITEM, CraftItemStack.asNMSCopy(data)));
     }
 }