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 46d6bc61ba54ab23eb35915073cfd5a3ab0111f1..74ea3f0154733ed4f096d88403fe011cca663e02 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 = () -> {
@@ -153,8 +153,34 @@ public class StonecutterMenu extends AbstractContainerMenu {
             return false;
         } else {
             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;