Paper/patches/server/0821-ItemStack-damage-API.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sun, 8 May 2022 13:35:45 -0700
Subject: [PATCH] ItemStack damage API

Adds methods notify clients about item breaks and
to simulate damage done to an itemstack and all
the logic associated with damaging them

== AT ==
public net.minecraft.world.entity.LivingEntity entityEventForEquipmentBreak(Lnet/minecraft/world/entity/EquipmentSlot;)B

diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
index 4b2ee2e1300203b2f3369cbf8ffcf1ad72153258..d12734b0c6b10ca8997a79e06fc9791abe0e9ed5 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
@@ -1036,6 +1036,53 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
         throw new IllegalArgumentException(entityCategory + " is an unrecognized entity category");
     }
 
+    @Override
+    public void broadcastSlotBreak(org.bukkit.inventory.EquipmentSlot slot) {
+        this.getHandle().broadcastBreakEvent(org.bukkit.craftbukkit.CraftEquipmentSlot.getNMS(slot));
+    }
+
+    @Override
+    public void broadcastSlotBreak(org.bukkit.inventory.EquipmentSlot slot, Collection<org.bukkit.entity.Player> players) {
+        if (players.isEmpty()) {
+            return;
+        }
+        final net.minecraft.network.protocol.game.ClientboundEntityEventPacket packet = new net.minecraft.network.protocol.game.ClientboundEntityEventPacket(
+            this.getHandle(),
+            net.minecraft.world.entity.LivingEntity.entityEventForEquipmentBreak(org.bukkit.craftbukkit.CraftEquipmentSlot.getNMS(slot))
+        );
+        players.forEach(player -> ((CraftPlayer) player).getHandle().connection.send(packet));
+    }
+
+    @Override
+    public ItemStack damageItemStack(ItemStack stack, int amount) {
+        final net.minecraft.world.item.ItemStack nmsStack;
+        if (stack instanceof CraftItemStack craftItemStack) {
+            if (craftItemStack.handle == null || craftItemStack.handle.isEmpty()) {
+                return stack;
+            }
+            nmsStack = craftItemStack.handle;
+        } else {
+            nmsStack = CraftItemStack.asNMSCopy(stack);
+            stack = CraftItemStack.asCraftMirror(nmsStack); // mirror to capture changes in hurt logic & events
+        }
+        this.damageItemStack0(nmsStack, amount, null);
+        return stack;
+    }
+
+    @Override
+    public void damageItemStack(org.bukkit.inventory.EquipmentSlot slot, int amount) {
+        final net.minecraft.world.entity.EquipmentSlot nmsSlot = org.bukkit.craftbukkit.CraftEquipmentSlot.getNMS(slot);
+        this.damageItemStack0(this.getHandle().getItemBySlot(nmsSlot), amount, nmsSlot);
+    }
+
+    private void damageItemStack0(net.minecraft.world.item.ItemStack nmsStack, int amount, net.minecraft.world.entity.EquipmentSlot slot) {
+        nmsStack.hurtAndBreak(amount, this.getHandle(), livingEntity -> {
+            if (slot != null) {
+                livingEntity.broadcastBreakEvent(slot);
+            }
+        });
+    }
+
     @Override
     public void knockback(double strength, double directionX, double directionZ) {
         Preconditions.checkArgument(strength > 0, "Knockback strength must be > 0");