From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <Blake.Galbreath@GMail.com>
Date: Fri, 3 Jul 2020 11:58:56 -0500
Subject: [PATCH] Add PrepareResultEvent

Adds a new event for all crafting stations that generate a result slot item

Anvil, Grindstone and Smithing now extend this event

diff --git a/src/main/java/net/minecraft/world/inventory/AnvilMenu.java b/src/main/java/net/minecraft/world/inventory/AnvilMenu.java
index e97953e3dad164862d7e2f86bd86a6eff5b80ae2..f00638e9d7baf8b803dd610f2bf6250da34efab3 100644
--- a/src/main/java/net/minecraft/world/inventory/AnvilMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/AnvilMenu.java
@@ -338,6 +338,7 @@ public class AnvilMenu extends ItemCombinerMenu {
             }
 
             this.createResult();
+            org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, RESULT_SLOT); // Paper
             return true;
         } else {
             return false;
diff --git a/src/main/java/net/minecraft/world/inventory/CartographyTableMenu.java b/src/main/java/net/minecraft/world/inventory/CartographyTableMenu.java
index fe1ce65b35e83ee0ada77e44b080729346bb3c2d..819187dbcf468d9278ce33bd97688476aab53f8e 100644
--- a/src/main/java/net/minecraft/world/inventory/CartographyTableMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/CartographyTableMenu.java
@@ -150,6 +150,7 @@ public class CartographyTableMenu extends AbstractContainerMenu {
             this.setupResultSlot(itemstack, itemstack1, itemstack2);
         }
 
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, RESULT_SLOT); // Paper
     }
 
     private void setupResultSlot(ItemStack map, ItemStack item, ItemStack oldResult) {
diff --git a/src/main/java/net/minecraft/world/inventory/GrindstoneMenu.java b/src/main/java/net/minecraft/world/inventory/GrindstoneMenu.java
index 45242f0ed5a0f98953df5f27fb76874d2d9e3473..811d7415ae843347da374d73b4edfe89642d518a 100644
--- a/src/main/java/net/minecraft/world/inventory/GrindstoneMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/GrindstoneMenu.java
@@ -159,6 +159,7 @@ public class GrindstoneMenu extends AbstractContainerMenu {
         super.slotsChanged(inventory);
         if (inventory == this.repairSlots) {
             this.createResult();
+            org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, RESULT_SLOT); // Paper
         }
 
     }
diff --git a/src/main/java/net/minecraft/world/inventory/ItemCombinerMenu.java b/src/main/java/net/minecraft/world/inventory/ItemCombinerMenu.java
index 4087e381b2250be387b608d8742f6a6009a52879..ff770b9ce68a62418de0c7ed389650626fa1dcb2 100644
--- a/src/main/java/net/minecraft/world/inventory/ItemCombinerMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/ItemCombinerMenu.java
@@ -110,6 +110,7 @@ public abstract class ItemCombinerMenu extends AbstractContainerMenu {
         super.slotsChanged(inventory);
         if (inventory == this.inputSlots) {
             this.createResult();
+            org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, this instanceof SmithingMenu ? 3 : 2); // Paper
         }
 
     }
diff --git a/src/main/java/net/minecraft/world/inventory/LoomMenu.java b/src/main/java/net/minecraft/world/inventory/LoomMenu.java
index 5c209a3d81db5326f63c506077fa0bfd241b4b12..757ee83a0ec5d381eb328f31f3bef636a9b72d57 100644
--- a/src/main/java/net/minecraft/world/inventory/LoomMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/LoomMenu.java
@@ -248,7 +248,8 @@ public class LoomMenu extends AbstractContainerMenu {
                 this.resultSlot.set(ItemStack.EMPTY);
             }
 
-            this.broadcastChanges();
+            // this.broadcastChanges(); // Paper - done below
+            org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, 3); // Paper
         } else {
             this.resultSlot.set(ItemStack.EMPTY);
             this.selectablePatterns = List.of();
diff --git a/src/main/java/net/minecraft/world/inventory/SmithingMenu.java b/src/main/java/net/minecraft/world/inventory/SmithingMenu.java
index 59d9f990a87ab5214fa51e3a6e933bf5ae71b613..857f65be8c4d9ec3a0586017b3f3e8e35cb78b97 100644
--- a/src/main/java/net/minecraft/world/inventory/SmithingMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/SmithingMenu.java
@@ -115,6 +115,7 @@ public class SmithingMenu extends ItemCombinerMenu {
             }
         }
 
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, RESULT_SLOT); // Paper
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/world/inventory/StonecutterMenu.java b/src/main/java/net/minecraft/world/inventory/StonecutterMenu.java
index 9c2fe69ced7a46bbd8b0fbe10fa67d0a39b0f375..70ecc3f673ebd56b65ad901e10f40c28368cbfac 100644
--- a/src/main/java/net/minecraft/world/inventory/StonecutterMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/StonecutterMenu.java
@@ -181,6 +181,7 @@ public class StonecutterMenu extends AbstractContainerMenu {
             this.setupRecipeList(inventory, itemstack);
         }
 
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, RESULT_SLOT); // Paper
     }
 
     private void setupRecipeList(Container input, ItemStack stack) {
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 839deebc72a575eea5db4decd82c8c8b1884e621..ce0d05009a9b88607a143ad40421d70148491817 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1717,26 +1717,53 @@ public class CraftEventFactory {
         return event;
     }
 
-    public static PrepareAnvilEvent callPrepareAnvilEvent(InventoryView view, ItemStack item) {
-        PrepareAnvilEvent event = new PrepareAnvilEvent(view, CraftItemStack.asCraftMirror(item).clone());
-        event.getView().getPlayer().getServer().getPluginManager().callEvent(event);
+    // Paper start - disable this method, handled below
+    public static void callPrepareAnvilEvent(InventoryView view, ItemStack item) { // Paper - verify nothing uses return - handled below in PrepareResult
+        PrepareAnvilEvent event = new PrepareAnvilEvent(view, CraftItemStack.asCraftMirror(item)); // Paper - remove clone
+        //event.getView().getPlayer().getServer().getPluginManager().callEvent(event); // Paper - disable event
         event.getInventory().setItem(2, event.getResult());
-        return event;
+        //return event; // Paper
     }
+    // Paper end
 
-    public static PrepareGrindstoneEvent callPrepareGrindstoneEvent(InventoryView view, ItemStack item) {
-        PrepareGrindstoneEvent event = new PrepareGrindstoneEvent(view, CraftItemStack.asCraftMirror(item).clone());
-        event.getView().getPlayer().getServer().getPluginManager().callEvent(event);
+    // Paper start - disable this method, handled below
+    public static void callPrepareGrindstoneEvent(InventoryView view, ItemStack item) {
+        PrepareGrindstoneEvent event = new PrepareGrindstoneEvent(view, CraftItemStack.asCraftMirror(item)); // Paper - remove clone
+        // event.getView().getPlayer().getServer().getPluginManager().callEvent(event); // Paper - disable event
         event.getInventory().setItem(2, event.getResult());
-        return event;
+        // return event; // Paper
     }
+    // Paper end
 
-    public static PrepareSmithingEvent callPrepareSmithingEvent(InventoryView view, ItemStack item) {
-        PrepareSmithingEvent event = new PrepareSmithingEvent(view, CraftItemStack.asCraftMirror(item).clone());
-        event.getView().getPlayer().getServer().getPluginManager().callEvent(event);
+    // Paper start - disable this method, handled in callPrepareResultEvent
+    public static void callPrepareSmithingEvent(InventoryView view, ItemStack item) { // Paper - verify nothing uses return - handled below in PrepareResult
+        PrepareSmithingEvent event = new PrepareSmithingEvent(view, CraftItemStack.asCraftMirror(item)); // Paper - remove clone
+        //event.getView().getPlayer().getServer().getPluginManager().callEvent(event); // Paper - disable event
         event.getInventory().setResult(event.getResult());
-        return event;
+        //return event; // Paper
     }
+    // Paper end
+
+    // Paper start - support specific overrides for prepare result
+    public static void callPrepareResultEvent(AbstractContainerMenu container, int resultSlot) {
+        com.destroystokyo.paper.event.inventory.PrepareResultEvent event;
+        InventoryView view = container.getBukkitView();
+        org.bukkit.inventory.ItemStack origItem = view.getTopInventory().getItem(resultSlot);
+        CraftItemStack result = origItem != null ? CraftItemStack.asCraftCopy(origItem) : null;
+        if (view.getTopInventory() instanceof org.bukkit.inventory.AnvilInventory) {
+            event = new PrepareAnvilEvent(view, result);
+        } else if (view.getTopInventory() instanceof org.bukkit.inventory.GrindstoneInventory) {
+            event = new PrepareGrindstoneEvent(view, result);
+        } else if (view.getTopInventory() instanceof org.bukkit.inventory.SmithingInventory) {
+            event = new PrepareSmithingEvent(view, result);
+        } else {
+            event = new com.destroystokyo.paper.event.inventory.PrepareResultEvent(view, result);
+        }
+        event.callEvent();
+        event.getInventory().setItem(resultSlot, event.getResult());
+        container.broadcastChanges();;
+    }
+    // Paper end
 
     /**
      * Mob spawner event.