From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jedediah Smith <jedediah@silencegreys.com>
Date: Sat, 2 Apr 2016 05:09:16 -0400
Subject: [PATCH] Add PlayerUseUnknownEntityEvent

Adds the PlayerUseUnknownEntityEvent to be used by plugins dealing with
virtual entities/entities that are not actually known to the server.

Co-authored-by: Nassim Jahnke <nassim@njahnke.dev>

diff --git a/src/main/java/net/minecraft/network/protocol/game/ServerboundInteractPacket.java b/src/main/java/net/minecraft/network/protocol/game/ServerboundInteractPacket.java
index 1e9c68cd1868d083e6a790d56006dd4aa432010a..8a0ee9564fc36a2badf1357f7e6c47b5f1500f6c 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ServerboundInteractPacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ServerboundInteractPacket.java
@@ -176,4 +176,14 @@ public class ServerboundInteractPacket implements Packet<ServerGamePacketListene
             buf.writeEnum(this.hand);
         }
     }
+
+    // Paper start - PlayerUseUnknownEntityEvent
+    public int getEntityId() {
+        return this.entityId;
+    }
+
+    public boolean isAttack() {
+        return this.action.getType() == ActionType.ATTACK;
+    }
+    // Paper end - PlayerUseUnknownEntityEvent
 }
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index ad598e57feb2d9db1b71cb3a432df22212aab9b3..555623fa4176c9ac4534cc7c5174d45f7c321ba1 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2476,7 +2476,26 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
                 });
             }
         }
+        // Paper start - PlayerUseUnknownEntityEvent
+        else {
+            packet.dispatch(new net.minecraft.network.protocol.game.ServerboundInteractPacket.Handler() {
+                @Override
+                public void onInteraction(net.minecraft.world.InteractionHand hand) {
+                    CraftEventFactory.callPlayerUseUnknownEntityEvent(ServerGamePacketListenerImpl.this.player, packet, hand, null);
+                }
+
+                @Override
+                public void onInteraction(net.minecraft.world.InteractionHand hand, net.minecraft.world.phys.Vec3 pos) {
+                    CraftEventFactory.callPlayerUseUnknownEntityEvent(ServerGamePacketListenerImpl.this.player, packet, hand, pos);
+                }
 
+                @Override
+                public void onAttack() {
+                    CraftEventFactory.callPlayerUseUnknownEntityEvent(ServerGamePacketListenerImpl.this.player, packet, net.minecraft.world.InteractionHand.MAIN_HAND, null);
+                }
+            });
+        }
+        // Paper end - PlayerUseUnknownEntityEvent
     }
 
     @Override
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 4c59520355a21249d2a3132dbaae97fd4e17c86b..76be4e52f7e140cf1951ae8be8a468e2bb7df20e 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1853,4 +1853,13 @@ public class CraftEventFactory {
 
         Bukkit.getPluginManager().callEvent(new EntityRemoveEvent(entity.getBukkitEntity(), cause));
     }
+    // Paper start - PlayerUseUnknownEntityEvent
+    public static void callPlayerUseUnknownEntityEvent(net.minecraft.world.entity.player.Player player, net.minecraft.network.protocol.game.ServerboundInteractPacket packet, InteractionHand hand, @Nullable net.minecraft.world.phys.Vec3 vector) {
+        new com.destroystokyo.paper.event.player.PlayerUseUnknownEntityEvent(
+            (Player) player.getBukkitEntity(), packet.getEntityId(), packet.isAttack(),
+            CraftEquipmentSlot.getHand(hand),
+            vector != null ? CraftVector.toBukkit(vector) : null
+        ).callEvent();
+    }
+    // Paper end - PlayerUseUnknownEntityEvent
 }