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 and Grindstone now extend this event

diff --git a/src/main/java/net/minecraft/server/ContainerAnvil.java b/src/main/java/net/minecraft/server/ContainerAnvil.java
index 24631b2bcb2a1d057c1fb6596ff401133c8b548a..a2eee6ed8f166d1ff42dc913ea34e80032d90e3a 100644
--- a/src/main/java/net/minecraft/server/ContainerAnvil.java
+++ b/src/main/java/net/minecraft/server/ContainerAnvil.java
@@ -294,6 +294,8 @@ public class ContainerAnvil extends ContainerAnvilAbstract {
         }
 
         this.e();
+
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(getBukkitView(), this.resultInventory.getItem(0), 2); // Paper
     }
 
     // CraftBukkit start
diff --git a/src/main/java/net/minecraft/server/ContainerAnvilAbstract.java b/src/main/java/net/minecraft/server/ContainerAnvilAbstract.java
index 2029d4dd9a2abe693c34723c379009578ab52503..71f588be3dfd840f2cd3d5a4f19cf8ff24d3837b 100644
--- a/src/main/java/net/minecraft/server/ContainerAnvilAbstract.java
+++ b/src/main/java/net/minecraft/server/ContainerAnvilAbstract.java
@@ -67,6 +67,7 @@ public abstract class ContainerAnvilAbstract extends Container {
             this.e();
         }
 
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(getBukkitView(), this.resultInventory.getItem(0), 2); // Paper
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/server/ContainerCartography.java b/src/main/java/net/minecraft/server/ContainerCartography.java
index 91e1372952f07087f51b22f1c53f63d2cf2f40fc..1acc7f4eaede582f79f6e17c594d8553582c675d 100644
--- a/src/main/java/net/minecraft/server/ContainerCartography.java
+++ b/src/main/java/net/minecraft/server/ContainerCartography.java
@@ -154,6 +154,7 @@ public class ContainerCartography extends Container {
             this.a(itemstack, itemstack1, itemstack2);
         }
 
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(getBukkitView(), this.resultInventory.getItem(0), 2); // Paper
     }
 
     private void a(ItemStack itemstack, ItemStack itemstack1, ItemStack itemstack2) {
diff --git a/src/main/java/net/minecraft/server/ContainerGrindstone.java b/src/main/java/net/minecraft/server/ContainerGrindstone.java
index fe9a083b724a8657cac8462b3f44d3cc12a4db58..cd7914ea4cc606b980aa22662beae2d4d8f3e0e9 100644
--- a/src/main/java/net/minecraft/server/ContainerGrindstone.java
+++ b/src/main/java/net/minecraft/server/ContainerGrindstone.java
@@ -10,6 +10,10 @@ import org.bukkit.craftbukkit.inventory.CraftInventoryGrindstone;
 import org.bukkit.craftbukkit.inventory.CraftInventoryView;
 import org.bukkit.entity.Player;
 // CraftBukkit end
+// Paper start
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import com.destroystokyo.paper.event.inventory.PrepareGrindstoneEvent;
+// Paper end
 
 public class ContainerGrindstone extends Container {
 
@@ -144,6 +148,9 @@ public class ContainerGrindstone extends Container {
         super.a(iinventory);
         if (iinventory == this.craftInventory) {
             this.e();
+            // Paper start
+            org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(getBukkitView(), this.resultInventory.getItem(0), 2); // Paper
+            // Paper end
         }
 
     }
diff --git a/src/main/java/net/minecraft/server/ContainerLoom.java b/src/main/java/net/minecraft/server/ContainerLoom.java
index 9490f74ee426e162844432073b3d78a2b6cddb32..e309f71e56933f0e7d2d9fc72a7681d4916eea3d 100644
--- a/src/main/java/net/minecraft/server/ContainerLoom.java
+++ b/src/main/java/net/minecraft/server/ContainerLoom.java
@@ -175,6 +175,8 @@ public class ContainerLoom extends Container {
 
         this.j();
         this.c();
+
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(getBukkitView(), this.resultInventory.getItem(0), 3); // Paper
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/server/ContainerSmithing.java b/src/main/java/net/minecraft/server/ContainerSmithing.java
index 76a81b30fa9e53952202c61717231d68d7be8e71..5392d82b90abe0de907c238153f4c769e5d998fa 100644
--- a/src/main/java/net/minecraft/server/ContainerSmithing.java
+++ b/src/main/java/net/minecraft/server/ContainerSmithing.java
@@ -65,6 +65,7 @@ public class ContainerSmithing extends ContainerAnvilAbstract {
             this.resultInventory.setItem(0, itemstack);
         }
 
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(getBukkitView(), this.resultInventory.getItem(0), 2); // Paper
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/server/ContainerStonecutter.java b/src/main/java/net/minecraft/server/ContainerStonecutter.java
index 270bf7f3e6ca15891419f1ce3e88d9aff094bee6..ce63c715e4920ad272e7c3dffb8f3279118d0fae 100644
--- a/src/main/java/net/minecraft/server/ContainerStonecutter.java
+++ b/src/main/java/net/minecraft/server/ContainerStonecutter.java
@@ -133,6 +133,7 @@ public class ContainerStonecutter extends Container {
             this.a(iinventory, itemstack);
         }
 
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(getBukkitView(), this.resultInventory.getItem(0), 1); // Paper
     }
 
     private void a(IInventory iinventory, ItemStack itemstack) {
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 6c5036b23a41769167fd53b8cc5454e5e747598e..7a55bc4796317976e05eb53535eb420eed51e9c6 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1548,12 +1548,30 @@ public class CraftEventFactory {
         return event;
     }
 
-    public static PrepareAnvilEvent callPrepareAnvilEvent(InventoryView view, ItemStack item) {
+    public static void callPrepareAnvilEvent(InventoryView view, ItemStack item) { // Paper - verify nothing uses return - handled below in PrepareResult
+        if (true) return; // Paper - nothing
         PrepareAnvilEvent event = new PrepareAnvilEvent(view, CraftItemStack.asCraftMirror(item).clone());
         event.getView().getPlayer().getServer().getPluginManager().callEvent(event);
         event.getInventory().setItem(2, event.getResult());
+        //return event; // Paper
+    }
+
+    // Paper start - support specific overrides for prepare result
+    public static com.destroystokyo.paper.event.inventory.PrepareResultEvent callPrepareResultEvent(InventoryView view, ItemStack item, int resultSlot) {
+        com.destroystokyo.paper.event.inventory.PrepareResultEvent event;
+        CraftItemStack result = CraftItemStack.asCraftMirror(item).clone();
+        if (view.getTopInventory() instanceof org.bukkit.inventory.AnvilInventory) {
+            event = new PrepareAnvilEvent(view, result);
+        } else if (view.getTopInventory() instanceof org.bukkit.inventory.GrindstoneInventory) {
+            event = new com.destroystokyo.paper.event.inventory.PrepareGrindstoneEvent(view, result);
+        } else {
+            event = new com.destroystokyo.paper.event.inventory.PrepareResultEvent(view, result);
+        }
+        event.callEvent();
+        event.getInventory().setItem(resultSlot, event.getResult());
         return event;
     }
+    // Paper end
 
     /**
      * Mob spawner event.