From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Fri, 27 Nov 2020 17:14:27 -0800
Subject: [PATCH] Add PlayerStonecutterRecipeSelectEvent

Co-Authored-By: MiniDigger <admin@benndorf.dev>

diff --git a/src/main/java/net/minecraft/world/inventory/StonecutterMenu.java b/src/main/java/net/minecraft/world/inventory/StonecutterMenu.java
index 97837d1baf6b929a50e5562ef466050e70c2c8b1..a93870952e2ef674028b8a20aa52a685c743e7ea 100644
--- a/src/main/java/net/minecraft/world/inventory/StonecutterMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/StonecutterMenu.java
@@ -64,7 +64,7 @@ public class StonecutterMenu extends AbstractContainerMenu {
 
     public StonecutterMenu(int syncId, Inventory playerInventory, final ContainerLevelAccess context) {
         super(MenuType.STONECUTTER, syncId);
-        this.selectedRecipeIndex = DataSlot.standalone();
+        this.selectedRecipeIndex = DataSlot.shared(new int[1], 0); // Paper - Add PlayerStonecutterRecipeSelectEvent
         this.recipesForInput = SelectableRecipe.SingleInputSet.empty();
         this.input = ItemStack.EMPTY;
         this.slotUpdateListener = () -> {
@@ -150,8 +150,34 @@ public class StonecutterMenu extends AbstractContainerMenu {
     @Override
     public boolean clickMenuButton(net.minecraft.world.entity.player.Player player, int id) {
         if (this.isValidRecipeIndex(id)) {
-            this.selectedRecipeIndex.set(id);
-            this.setupResultSlot(id);
+            // Paper start - Add PlayerStonecutterRecipeSelectEvent
+            int recipeIndex = id;
+            this.selectedRecipeIndex.set(recipeIndex);
+            this.selectedRecipeIndex.checkAndClearUpdateFlag(); // mark as changed
+            paperEventBlock: if (this.isValidRecipeIndex(id)) {
+                final Optional<RecipeHolder<StonecutterRecipe>> recipe = this.recipesForInput.entries().get(id).recipe().recipe();
+                if (recipe.isEmpty()) break paperEventBlock; // The recipe selected does not have an actual server recipe (presumably its the empty one). Cannot call the event, just break.
+
+                io.papermc.paper.event.player.PlayerStonecutterRecipeSelectEvent event = new io.papermc.paper.event.player.PlayerStonecutterRecipeSelectEvent((Player) player.getBukkitEntity(), getBukkitView().getTopInventory(), (org.bukkit.inventory.StonecuttingRecipe) recipe.get().toBukkitRecipe());
+                if (!event.callEvent()) {
+                    player.containerMenu.sendAllDataToRemote();
+                    return false;
+                }
+
+                net.minecraft.resources.ResourceLocation key = org.bukkit.craftbukkit.util.CraftNamespacedKey.toMinecraft(event.getStonecuttingRecipe().getKey());
+                if (!recipe.get().id().location().equals(key)) { // If the recipe did NOT stay the same
+                    for (int newRecipeIndex = 0; newRecipeIndex < this.recipesForInput.entries().size(); newRecipeIndex++) {
+                        if (this.recipesForInput.entries().get(newRecipeIndex).recipe().recipe().filter(r -> r.id().location().equals(key)).isPresent()) {
+                            recipeIndex = newRecipeIndex;
+                            break;
+                        }
+                    }
+                }
+            }
+            player.containerMenu.sendAllDataToRemote();
+            this.selectedRecipeIndex.set(recipeIndex); // set new index, so that listeners can read it
+            this.setupResultSlot(recipeIndex);
+            // Paper end - Add PlayerStonecutterRecipeSelectEvent
         }
 
         return true;