From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Thu, 20 Jan 2022 18:11:20 -0800
Subject: [PATCH] Expand PlayerItemMendEvent


diff --git a/src/main/java/net/minecraft/world/entity/ExperienceOrb.java b/src/main/java/net/minecraft/world/entity/ExperienceOrb.java
index a758b2456acac23095fe4619ae10300a034cb460..a58ff67052fb5f33782f8b5c83465ec03ef1d073 100644
--- a/src/main/java/net/minecraft/world/entity/ExperienceOrb.java
+++ b/src/main/java/net/minecraft/world/entity/ExperienceOrb.java
@@ -354,7 +354,10 @@ public class ExperienceOrb extends Entity {
             int j = EnchantmentHelper.modifyDurabilityToRepairFromXp(player.serverLevel(), itemstack, amount);
             int k = Math.min(j, itemstack.getDamageValue());
             // CraftBukkit start
-            org.bukkit.event.player.PlayerItemMendEvent event = CraftEventFactory.callPlayerItemMendEvent(player, this, itemstack, optional.get().inSlot(), k);
+            // Paper start - mending event
+            final int consumedExperience = k > 0 ? k * amount / j : 0;
+            org.bukkit.event.player.PlayerItemMendEvent event = CraftEventFactory.callPlayerItemMendEvent(player, this, itemstack, optional.get().inSlot(), k, consumedExperience);
+            // Paper end - mending event
             k = event.getRepairAmount();
             if (event.isCancelled()) {
                 return amount;
@@ -363,7 +366,7 @@ public class ExperienceOrb extends Entity {
 
             itemstack.setDamageValue(itemstack.getDamageValue() - k);
             if (k > 0) {
-                int l = amount - k * amount / j;
+                int l = amount - k * amount / j; // Paper - diff on change - expand PlayerMendEvents
 
                 if (l > 0) {
                     // this.value = l; // CraftBukkit - update exp value of orb for PlayerItemMendEvent calls // Paper - the value field should not be mutated here because it doesn't take "count" into account
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index ee5d93cd0c7ea7376e8488265d4e21610edeedc2..e84337b01ec7e5c530a4c6042b9386385eb58446 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -1852,11 +1852,12 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
                 handle.serverLevel(), itemstack, amount
             );
             int i = Math.min(possibleDurabilityFromXp, itemstack.getDamageValue());
-            org.bukkit.event.player.PlayerItemMendEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerItemMendEvent(handle, orb, itemstack, stackEntry.get().inSlot(), i);
+            final int consumedExperience = i * amount / possibleDurabilityFromXp; // Paper - taken from ExperienceOrb#repairPlayerItems
+            org.bukkit.event.player.PlayerItemMendEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerItemMendEvent(handle, orb, itemstack, stackEntry.get().inSlot(), i, consumedExperience);
             i = event.getRepairAmount();
             orb.discard(org.bukkit.event.entity.EntityRemoveEvent.Cause.DESPAWN);
             if (!event.isCancelled()) {
-                amount -= i * amount / possibleDurabilityFromXp;
+                amount -= consumedExperience; // Use previously computed variable to reduce diff on change.
                 itemstack.setDamageValue(itemstack.getDamageValue() - i);
             }
         }
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 63038e0ca10507751218fda5b9ace3cb6295e817..214a1b8901947e8c08e8d7fc3f19e866a21350c8 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1267,10 +1267,10 @@ public class CraftEventFactory {
         return event;
     }
 
-    public static PlayerItemMendEvent callPlayerItemMendEvent(net.minecraft.world.entity.player.Player entity, net.minecraft.world.entity.ExperienceOrb orb, net.minecraft.world.item.ItemStack nmsMendedItem, net.minecraft.world.entity.EquipmentSlot slot, int repairAmount) {
+    public static PlayerItemMendEvent callPlayerItemMendEvent(net.minecraft.world.entity.player.Player entity, net.minecraft.world.entity.ExperienceOrb orb, net.minecraft.world.item.ItemStack nmsMendedItem, net.minecraft.world.entity.EquipmentSlot slot, int repairAmount, int consumedExperience) { // Paper - Expand PlayerItemMendEvent
         Player player = (Player) entity.getBukkitEntity();
         org.bukkit.inventory.ItemStack bukkitStack = CraftItemStack.asCraftMirror(nmsMendedItem);
-        PlayerItemMendEvent event = new PlayerItemMendEvent(player, bukkitStack, CraftEquipmentSlot.getSlot(slot), (ExperienceOrb) orb.getBukkitEntity(), repairAmount);
+        PlayerItemMendEvent event = new PlayerItemMendEvent(player, bukkitStack, CraftEquipmentSlot.getSlot(slot), (ExperienceOrb) orb.getBukkitEntity(), repairAmount, consumedExperience); // Paper - Expand PlayerItemMendEvent
         Bukkit.getPluginManager().callEvent(event);
         return event;
     }
