From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <blake.galbreath@gmail.com>
Date: Thu, 23 Dec 2021 15:32:50 -0600
Subject: [PATCH] Expose isFuel and canSmelt methods to FurnaceInventory


diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryFurnace.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryFurnace.java
index 29a8cd7667860c4598a556e6ef3af39c731683db..bd370f5c856d75b7210ef26036aedaa859c570be 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryFurnace.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryFurnace.java
@@ -40,6 +40,20 @@ public class CraftInventoryFurnace extends CraftInventory implements FurnaceInve
         this.setItem(0, stack);
     }
 
+    // Paper start
+    @Override
+    public boolean isFuel(ItemStack stack) {
+        return stack != null && !stack.getType().isEmpty() && AbstractFurnaceBlockEntity.isFuel(CraftItemStack.asNMSCopy(stack));
+    }
+
+    @Override
+    public boolean canSmelt(ItemStack stack) {
+        // data packs are always loaded in the main world
+        net.minecraft.server.level.ServerLevel world = ((org.bukkit.craftbukkit.CraftWorld) org.bukkit.Bukkit.getWorlds().get(0)).getHandle();
+        return stack != null && !stack.getType().isEmpty() && world.getRecipeManager().getRecipeFor(((AbstractFurnaceBlockEntity) this.inventory).recipeType, new net.minecraft.world.item.crafting.SingleRecipeInput(CraftItemStack.asNMSCopy(stack)), world).isPresent();
+    }
+    // Paper end
+
     @Override
     public Furnace getHolder() {
         return (Furnace) this.inventory.getOwner();