Paper/patches/server/0815-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 8be0e064f1f7e98e6bfd5915cd4eaf814b5f1d26..711eb84fee6c46341928a765970defa47e1fe0c3 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
@@ -1129,4 +1129,52 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
         this.getHandle().knockback(strength, directionX, directionZ);
     };
     // Paper end - knockback API
+
+    // Paper start - ItemStack damage API
+    public void broadcastSlotBreak(final org.bukkit.inventory.EquipmentSlot slot) {
+        this.getHandle().broadcastBreakEvent(org.bukkit.craftbukkit.CraftEquipmentSlot.getNMS(slot));
+    }
+
+    @Override
+    public void broadcastSlotBreak(final org.bukkit.inventory.EquipmentSlot slot, final 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, final int amount) {
+        final net.minecraft.world.item.ItemStack nmsStack;
+        if (stack instanceof final 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(final org.bukkit.inventory.EquipmentSlot slot, final 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(final net.minecraft.world.item.ItemStack nmsStack, final int amount, final net.minecraft.world.entity.EquipmentSlot slot) {
+        nmsStack.hurtAndBreak(amount, this.getHandle(), livingEntity -> {
+            if (slot != null) {
+                livingEntity.broadcastBreakEvent(slot);
+            }
+        });
+    }
+    // Paper end - ItemStack damage API
 }