From d57dfeff220bc423b561e2a9f988d93a720422ff 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 +++++++
 .../net/pl3x/purpur/PurpurWorldConfig.java    |  2 ++
 4 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/src/main/java/net/minecraft/server/EnchantmentManager.java b/src/main/java/net/minecraft/server/EnchantmentManager.java
index d96c03a1a..da1cfc1d3 100644
--- a/src/main/java/net/minecraft/server/EnchantmentManager.java
+++ b/src/main/java/net/minecraft/server/EnchantmentManager.java
@@ -246,9 +246,32 @@ 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 @javax.annotation.Nonnull ItemStack getRandomEquippedItemWithEnchant(Enchantment enchantment, EntityLiving entityliving) {
-        Entry<EnumItemSlot, ItemStack> entry = b(enchantment, entityliving);
+        Entry<EnumItemSlot, ItemStack> entry = enchantment == Enchantments.MENDING && entityliving.world.purpurConfig.useBetterMending ? getMostDamagedEquipment(enchantment, entityliving) : b(enchantment, entityliving); // Purpur
         return entry != null ? entry.getValue() : ItemStack.NULL_ITEM;
     }
     @Nullable
diff --git a/src/main/java/net/minecraft/server/EntityExperienceOrb.java b/src/main/java/net/minecraft/server/EntityExperienceOrb.java
index 53c6c3389..0fae3693c 100644
--- a/src/main/java/net/minecraft/server/EntityExperienceOrb.java
+++ b/src/main/java/net/minecraft/server/EntityExperienceOrb.java
@@ -225,7 +225,7 @@ public class EntityExperienceOrb extends Entity {
             if (this.d == 0 && entityhuman.bC == 0 && new com.destroystokyo.paper.event.player.PlayerPickupExperienceEvent(((EntityPlayer) entityhuman).getBukkitEntity(), (org.bukkit.entity.ExperienceOrb) this.getBukkitEntity()).callEvent()) { // Paper
                 entityhuman.bC = 2;
                 entityhuman.receive(this, 1);
-                Entry<EnumItemSlot, ItemStack> entry = EnchantmentManager.b(Enchantments.MENDING, (EntityLiving) entityhuman);
+                Entry<EnumItemSlot, ItemStack> entry = world.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 4730c2beb..4fe503808 100644
--- a/src/main/java/net/minecraft/server/ItemStack.java
+++ b/src/main/java/net/minecraft/server/ItemStack.java
@@ -369,10 +369,19 @@ 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/PurpurWorldConfig.java b/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
index 3dbcd3f0e..8e6e141dc 100644
--- a/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
+++ b/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
@@ -127,6 +127,7 @@ public class PurpurWorldConfig {
     public Map<Block, Double> controllableMinecartsBlockSpeeds = new HashMap<>();
     public boolean disableDropsOnCrammingDeath = false;
     public boolean milkCuresBadOmen = true;
+    public boolean useBetterMending = false;
     private void gameplayMechanicsSettings() {
         controllableMinecarts = getBoolean("gameplay-mechanics.controllable-minecarts.enabled", controllableMinecarts);
         controllableMinecartsPlaceAnywhere = getBoolean("gameplay-mechanics.controllable-minecarts.place-anywhere", controllableMinecartsPlaceAnywhere);
@@ -147,6 +148,7 @@ public class PurpurWorldConfig {
         }
         disableDropsOnCrammingDeath = getBoolean("gameplay-mechanics.disable-drops-on-cramming-death", disableDropsOnCrammingDeath);
         milkCuresBadOmen = getBoolean("gameplay-mechanics.milk-cures-bad-omen", milkCuresBadOmen);
+        useBetterMending = getBoolean("gameplay-mechanics.use-better-mending", useBetterMending);
     }
 
     public boolean idleTimeoutKick = true;
-- 
2.24.0