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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Thu, 6 May 2021 19:57:58 -0700
Subject: [PATCH] More Enchantment API


diff --git a/src/main/java/net/minecraft/world/item/enchantment/Enchantment.java b/src/main/java/net/minecraft/world/item/enchantment/Enchantment.java
index b76ef55145336cc8dc4857b79767f5a738ad5144..c719c1c1f837753f61eb7be83b6ec2a214ab6819 100644
--- a/src/main/java/net/minecraft/world/item/enchantment/Enchantment.java
+++ b/src/main/java/net/minecraft/world/item/enchantment/Enchantment.java
@@ -17,7 +17,7 @@ import net.minecraft.world.item.ItemStack;
 
 public abstract class Enchantment {
 
-    private final EnumItemSlot[] a;
+    private final EnumItemSlot[] a; public final EnumItemSlot[] getSlots() { return this.a; } // Paper - OBFHELPER
     private final Enchantment.Rarity d;
     public final EnchantmentSlotType itemTarget;
     @Nullable
@@ -46,6 +46,7 @@ public abstract class Enchantment {
         return map;
     }
 
+    public Enchantment.Rarity getRarity() { return d(); } // Paper - OBFHELPER
     public Enchantment.Rarity d() {
         return this.d;
     }
@@ -70,6 +71,7 @@ public abstract class Enchantment {
         return 0;
     }
 
+    public float getDamageIncrease(int level, EnumMonsterType enumMonsterType) { return a(level, enumMonsterType); } // Paper - OBFHELPER
     public float a(int i, EnumMonsterType enummonstertype) {
         return 0.0F;
     }
@@ -123,14 +125,17 @@ public abstract class Enchantment {
         return false;
     }
 
+    public boolean isCursed() { return c(); } // Paper - OBFHELPER
     public boolean c() {
         return false;
     }
 
+    public boolean isTradeable() { return h(); } // Paper - OBFHELPER
     public boolean h() {
         return true;
     }
 
+    public boolean isDiscoverable() { return i(); } // Paper - OBFHELPER
     public boolean i() {
         return true;
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/enchantments/CraftEnchantment.java b/src/main/java/org/bukkit/craftbukkit/enchantments/CraftEnchantment.java
index 5a14430f63894bbe9daa42900cf5a6519bea4f45..3b83852249e56609074ef1e8cdad6416db66007b 100644
--- a/src/main/java/org/bukkit/craftbukkit/enchantments/CraftEnchantment.java
+++ b/src/main/java/org/bukkit/craftbukkit/enchantments/CraftEnchantment.java
@@ -71,7 +71,7 @@ public class CraftEnchantment extends Enchantment {
 
     @Override
     public boolean isCursed() {
-        return target instanceof EnchantmentBinding || target instanceof EnchantmentVanishing;
+        return target.isCursed(); // Paper
     }
 
     @Override
@@ -192,6 +192,45 @@ public class CraftEnchantment extends Enchantment {
     public net.kyori.adventure.text.Component displayName(int level) {
         return io.papermc.paper.adventure.PaperAdventure.asAdventure(getHandle().getTranslationComponentForLevel(level));
     }
+
+    @Override
+    public boolean isTradeable() {
+        return target.isTradeable();
+    }
+
+    @Override
+    public boolean isDiscoverable() {
+        return target.isDiscoverable();
+    }
+
+    @Override
+    public io.papermc.paper.enchantments.EnchantmentRarity getRarity() {
+        return fromNMSRarity(target.getRarity());
+    }
+
+    @Override
+    public float getDamageIncrease(int level, org.bukkit.entity.EntityCategory entityCategory) {
+        return target.getDamageIncrease(level, org.bukkit.craftbukkit.entity.CraftLivingEntity.fromBukkitEntityCategory(entityCategory));
+    }
+
+    @Override
+    public java.util.Set<org.bukkit.inventory.EquipmentSlot> getActiveSlots() {
+        return java.util.stream.Stream.of(target.getSlots()).map(org.bukkit.craftbukkit.CraftEquipmentSlot::getSlot).collect(java.util.stream.Collectors.toSet());
+    }
+
+    public static io.papermc.paper.enchantments.EnchantmentRarity fromNMSRarity(net.minecraft.world.item.enchantment.Enchantment.Rarity nmsRarity) {
+        if (nmsRarity == net.minecraft.world.item.enchantment.Enchantment.Rarity.COMMON) {
+            return io.papermc.paper.enchantments.EnchantmentRarity.COMMON;
+        } else if (nmsRarity == net.minecraft.world.item.enchantment.Enchantment.Rarity.UNCOMMON) {
+            return io.papermc.paper.enchantments.EnchantmentRarity.UNCOMMON;
+        } else if (nmsRarity == net.minecraft.world.item.enchantment.Enchantment.Rarity.RARE) {
+            return io.papermc.paper.enchantments.EnchantmentRarity.RARE;
+        } else if (nmsRarity == net.minecraft.world.item.enchantment.Enchantment.Rarity.VERY_RARE) {
+            return io.papermc.paper.enchantments.EnchantmentRarity.VERY_RARE;
+        }
+
+        throw new IllegalArgumentException(String.format("Unable to convert %s to a enum value of %s.", nmsRarity, io.papermc.paper.enchantments.EnchantmentRarity.class));
+    }
     // Paper end
 
     public net.minecraft.world.item.enchantment.Enchantment getHandle() {
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
index 3d497f69f89455b88fba423de8effb3db83e7af4..4545bac9309f5a3aad617f48f7808d8ae829602d 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
@@ -842,5 +842,21 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
     public void setHurtDirection(float hurtDirection) {
         getHandle().setHurtDirection(hurtDirection);
     }
+
+    public static EnumMonsterType fromBukkitEntityCategory(EntityCategory entityCategory) {
+        switch (entityCategory) {
+            case NONE:
+                return EnumMonsterType.UNDEFINED;
+            case UNDEAD:
+                return EnumMonsterType.UNDEAD;
+            case ARTHROPOD:
+                return EnumMonsterType.ARTHROPOD;
+            case ILLAGER:
+                return EnumMonsterType.ILLAGER;
+            case WATER:
+                return EnumMonsterType.WATER_MOB;
+        }
+        throw new IllegalArgumentException(entityCategory + " is an unrecognized entity category");
+    }
     // Paper end
 }
diff --git a/src/test/java/io/papermc/paper/enchantments/EnchantmentRarityTest.java b/src/test/java/io/papermc/paper/enchantments/EnchantmentRarityTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..62b56b5b43696b03fc72cac59f986d006edc3f76
--- /dev/null
+++ b/src/test/java/io/papermc/paper/enchantments/EnchantmentRarityTest.java
@@ -0,0 +1,18 @@
+package io.papermc.paper.enchantments;
+
+import net.minecraft.world.item.enchantment.Enchantment.Rarity;
+import org.bukkit.craftbukkit.enchantments.CraftEnchantment;
+import org.junit.Test;
+
+import static org.junit.Assert.assertNotNull;
+
+public class EnchantmentRarityTest {
+
+    @Test
+    public void test() {
+        for (Rarity nmsRarity : Rarity.values()) {
+            // Will throw exception if a bukkit counterpart is not found
+            CraftEnchantment.fromNMSRarity(nmsRarity);
+        }
+    }
+}
diff --git a/src/test/java/io/papermc/paper/entity/EntityCategoryTest.java b/src/test/java/io/papermc/paper/entity/EntityCategoryTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..adb0e5b4268fa115b814143cf29d9a3688e4bc17
--- /dev/null
+++ b/src/test/java/io/papermc/paper/entity/EntityCategoryTest.java
@@ -0,0 +1,34 @@
+package io.papermc.paper.entity;
+
+import com.google.common.base.Joiner;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
+import net.minecraft.world.entity.EnumMonsterType;
+import org.bukkit.craftbukkit.entity.CraftLivingEntity;
+import org.bukkit.entity.EntityCategory;
+import org.junit.Test;
+
+import java.lang.reflect.Field;
+import java.util.Map;
+import java.util.Set;
+
+import static org.junit.Assert.assertTrue;
+
+public class EntityCategoryTest {
+
+    @Test
+    public void test() throws IllegalAccessException {
+
+        Map<EnumMonsterType, String> enumMonsterTypeFieldMap = Maps.newHashMap();
+        for (Field field : EnumMonsterType.class.getDeclaredFields()) {
+            if (field.getType() == EnumMonsterType.class) {
+                enumMonsterTypeFieldMap.put( (EnumMonsterType) field.get(null), field.getName());
+            }
+        }
+
+        for (EntityCategory entityCategory : EntityCategory.values()) {
+            enumMonsterTypeFieldMap.remove(CraftLivingEntity.fromBukkitEntityCategory(entityCategory));
+        }
+        assertTrue(EnumMonsterType.class.getName() + " instance(s): " + Joiner.on(", ").join(enumMonsterTypeFieldMap.values()) + " do not have bukkit equivalents", enumMonsterTypeFieldMap.size() == 0);
+    }
+}