From 0d22bf42411b99685e372b4e4d661bbe15496da1 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Sun, 14 Jul 2019 19:52:47 -0500
Subject: [PATCH] Mending mends most damages equipment first

---
 .../minecraft/server/EnchantmentManager.java  | 25 ++++++++++++++++++-
 .../minecraft/server/EntityExperienceOrb.java |  2 +-
 .../java/net/minecraft/server/ItemStack.java  |  9 +++++++
 .../java/net/pl3x/purpur/PurpurConfig.java    |  5 ++++
 4 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/src/main/java/net/minecraft/server/EnchantmentManager.java b/src/main/java/net/minecraft/server/EnchantmentManager.java
index 1d16919e..69746fd1 100644
--- a/src/main/java/net/minecraft/server/EnchantmentManager.java
+++ b/src/main/java/net/minecraft/server/EnchantmentManager.java
@@ -241,9 +241,32 @@ public class EnchantmentManager {
         return getEnchantmentLevel(Enchantments.CHANNELING, itemstack) > 0;
     }
 
+    // Purpur start
+    @Nullable
+    public static Entry<EnumItemSlot, ItemStack> getMostDamagedEquipment(Enchantment enchantment, EntityLiving entityliving) {
+        Map<EnumItemSlot, ItemStack> map = enchantment.a(entityliving);
+        if (map.isEmpty()) {
+            return null;
+        }
+        Entry<EnumItemSlot, ItemStack> item = null;
+        float maxPercent = 0F;
+        for (Entry<EnumItemSlot, ItemStack> entry : map.entrySet()) {
+            ItemStack itemstack = entry.getValue();
+            if (!itemstack.isEmpty() && itemstack.isDamaged() && getEnchantmentLevel(enchantment, itemstack) > 0) {
+                float percent = itemstack.getDamagePercent();
+                if (item == null || percent > maxPercent) {
+                    item = entry;
+                    maxPercent = percent;
+                }
+            }
+        }
+        return item;
+    }
+    // Purpur end
+
     // Paper - OBFHELPER
     public static @Nullable ItemStack getRandomEquippedItemWithEnchant(Enchantment enchantment, EntityLiving entityliving) {
-        Entry<EnumItemSlot, ItemStack> entry = b(enchantment, entityliving);
+        Entry<EnumItemSlot, ItemStack> entry = enchantment == Enchantments.MENDING && net.pl3x.purpur.PurpurConfig.useBetterMending ? getMostDamagedEquipment(enchantment, entityliving) : b(enchantment, entityliving); // Purpur
         return entry != null ? entry.getValue() : null;
     }
     @Nullable
diff --git a/src/main/java/net/minecraft/server/EntityExperienceOrb.java b/src/main/java/net/minecraft/server/EntityExperienceOrb.java
index 1a98442e..8a4eedb7 100644
--- a/src/main/java/net/minecraft/server/EntityExperienceOrb.java
+++ b/src/main/java/net/minecraft/server/EntityExperienceOrb.java
@@ -222,7 +222,7 @@ public class EntityExperienceOrb extends Entity {
             if (this.d == 0 && entityhuman.bF == 0 && new com.destroystokyo.paper.event.player.PlayerPickupExperienceEvent(((EntityPlayer) entityhuman).getBukkitEntity(), (org.bukkit.entity.ExperienceOrb) this.getBukkitEntity()).callEvent()) { // Paper
                 entityhuman.bF = 2;
                 entityhuman.receive(this, 1);
-                Entry<EnumItemSlot, ItemStack> entry = EnchantmentManager.b(Enchantments.MENDING, (EntityLiving) entityhuman);
+                Entry<EnumItemSlot, ItemStack> entry = net.pl3x.purpur.PurpurConfig.useBetterMending ? EnchantmentManager.getMostDamagedEquipment(Enchantments.MENDING, entityhuman) : EnchantmentManager.b(Enchantments.MENDING, entityhuman); // Purpur
 
                 if (entry != null) {
                     ItemStack itemstack = (ItemStack) entry.getValue();
diff --git a/src/main/java/net/minecraft/server/ItemStack.java b/src/main/java/net/minecraft/server/ItemStack.java
index 0e164840..41e88916 100644
--- a/src/main/java/net/minecraft/server/ItemStack.java
+++ b/src/main/java/net/minecraft/server/ItemStack.java
@@ -364,10 +364,19 @@ public final class ItemStack {
         }
     }
 
+    public boolean isDamaged() { return f(); } // Purpur - OBFHELPER
     public boolean f() {
         return this.e() && this.getDamage() > 0;
     }
 
+    public float getDamagePercent() {
+        if (isDamaged()) {
+            return (float) getDamage() / (float) getItem().getMaxDurability();
+        } else {
+            return 0F;
+        }
+    }
+
     public int getDamage() {
         return this.tag == null ? 0 : this.tag.getInt("Damage");
     }
diff --git a/src/main/java/net/pl3x/purpur/PurpurConfig.java b/src/main/java/net/pl3x/purpur/PurpurConfig.java
index 253e0b31..f8a35064 100644
--- a/src/main/java/net/pl3x/purpur/PurpurConfig.java
+++ b/src/main/java/net/pl3x/purpur/PurpurConfig.java
@@ -151,6 +151,11 @@ public class PurpurConfig {
         fixItemPositionDesync = getBoolean("settings.fix-item-position-desync", fixItemPositionDesync);
     }
 
+    public static boolean useBetterMending = true;
+    private static void useBetterMending() {
+        useBetterMending = getBoolean("settings.use-better-mending", useBetterMending);
+    }
+
     public static boolean requireShiftToMount = true;
     private static void requireShiftToMount() {
         requireShiftToMount = getBoolean("settings.mobs.require-shift-to-mount", requireShiftToMount);
-- 
2.20.1