From b5b1f6e3dc91f247f2ad51aaeb653c27366f0644 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Fri, 18 Jan 2019 00:08:15 -0500
Subject: [PATCH] Fix Custom Shapeless Custom Crafting Recipes

Mojang implemented Shapeless different than Shaped

This made the Bukkit RecipeChoice API not work for Shapeless.

This reimplements vanilla logic using the same test logic as Shaped

diff --git a/src/main/java/net/minecraft/server/ShapelessRecipes.java b/src/main/java/net/minecraft/server/ShapelessRecipes.java
index 070fc1e3ec..691e697d68 100644
--- a/src/main/java/net/minecraft/server/ShapelessRecipes.java
+++ b/src/main/java/net/minecraft/server/ShapelessRecipes.java
@@ -63,16 +63,46 @@ public class ShapelessRecipes implements RecipeCrafting {
         AutoRecipeStackManager autorecipestackmanager = new AutoRecipeStackManager();
         int i = 0;
 
+        // Paper start
+        java.util.List<ItemStack> providedItems = new java.util.ArrayList<>();
+        co.aikar.util.Counter<ItemStack> matchedProvided = new co.aikar.util.Counter<>();
+        co.aikar.util.Counter<RecipeItemStack> matchedIngredients = new co.aikar.util.Counter<>();
+        // Paper end
         for (int j = 0; j < inventorycrafting.getSize(); ++j) {
             ItemStack itemstack = inventorycrafting.getItem(j);
 
             if (!itemstack.isEmpty()) {
-                ++i;
-                autorecipestackmanager.a(itemstack, 1);
+                // Paper start
+                itemstack = itemstack.cloneItemStack();
+                providedItems.add(itemstack);
+                for (RecipeItemStack ingredient : ingredients) {
+                    if (ingredient.test(itemstack)) {
+                        matchedProvided.increment(itemstack);
+                        matchedIngredients.increment(ingredient);
+                    }
+                }
+                // Paper end
             }
         }
 
-        return i == this.ingredients.size() && autorecipestackmanager.a(this, (IntList) null);
+        // Paper start
+        java.util.List<RecipeItemStack> ingredients = new java.util.ArrayList<>(this.ingredients);
+        providedItems.sort(java.util.Comparator.comparingInt((ItemStack c) -> (int) matchedProvided.getCount(c)).reversed());
+        ingredients.sort(java.util.Comparator.comparingInt((RecipeItemStack c) -> (int) matchedIngredients.getCount(c)));
+
+        PROVIDED:
+        for (ItemStack provided : providedItems) {
+            for (Iterator<RecipeItemStack> itIngredient = ingredients.iterator(); itIngredient.hasNext(); ) {
+                RecipeItemStack ingredient = itIngredient.next();
+                if (ingredient.test(provided)) {
+                    itIngredient.remove();
+                    continue PROVIDED;
+                }
+            }
+            return false;
+        }
+        return ingredients.isEmpty();
+        // Paper end
     }
 
     public ItemStack a(InventoryCrafting inventorycrafting) {
-- 
2.22.0