From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Alexander <protonull@protonmail.com>
Date: Sun, 7 Jun 2020 22:37:24 +0100
Subject: [PATCH] Fixed enchantment costs.

As of now, the cost of enchantments are based on which button is pressed. The first, second, and third tier of enchantments will cost 1, 2, and 3 levels respectively. Plugins that listen for the `EnchantItemEvent` event can call `setExpLevelCost(20)` for example to, as the documentation states, set the cost of the enchantment, however that value will only be used as a threshold to enchantment; that a tier 3 enchantment that costs 30 levels will mean that you cannot enchant until you have 30 levels, but will in fact only cost you 3 levels.

This bug, for a lack of a better word, was introduced in 1.13 and has persisted, though the exact version where this was introduced remains unknown, as is the reason for the change.

diff --git a/src/main/java/net/minecraft/server/ContainerEnchantTable.java b/src/main/java/net/minecraft/server/ContainerEnchantTable.java
index b8c5af8bee0dcb2ab25c03dabb7dbe20561da065..b3c0e251b58b088a43b104562b566191991152f2 100644
--- a/src/main/java/net/minecraft/server/ContainerEnchantTable.java
+++ b/src/main/java/net/minecraft/server/ContainerEnchantTable.java
@@ -274,7 +274,7 @@ public class ContainerEnchantTable extends Container {
                         }
                     }
 
-                    entityhuman.enchantDone(itemstack, j);
+                    entityhuman.enchantDone(itemstack, level); // Paper - Make enchantments cost set levels
                     // CraftBukkit end
 
                     // CraftBukkit - TODO: let plugins change this