From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: DoctaEnkoda <bierquejason@gmail.com>
Date: Mon, 9 Aug 2021 13:22:20 +0200
Subject: [PATCH] Added the ability to add combustible items


diff --git a/src/main/java/net/minecraft/world/inventory/AbstractFurnaceMenu.java b/src/main/java/net/minecraft/world/inventory/AbstractFurnaceMenu.java
index 1240df9368855f836412b06cf564926a18bfe90d..e559eabed82d2f402908e5b80d1505076ccc53a2 100644
--- a/src/main/java/net/minecraft/world/inventory/AbstractFurnaceMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/AbstractFurnaceMenu.java
@@ -114,7 +114,13 @@ public abstract class AbstractFurnaceMenu extends RecipeBookMenu {
             } else if (slot != 1 && slot != 0) {
                 if (this.canSmelt(itemstack1)) {
                     if (!this.moveItemStackTo(itemstack1, 0, 1, false)) {
-                        return ItemStack.EMPTY;
+                        // Purpur start - fix #625
+                        if (this.isFuel(itemstack1)) {
+                            if (!this.moveItemStackTo(itemstack1, 1, 2, false)) {
+                                return ItemStack.EMPTY;
+                            }
+                        }
+                        // Purpur end
                     }
                 } else if (this.isFuel(itemstack1)) {
                     if (!this.moveItemStackTo(itemstack1, 1, 2, false)) {
diff --git a/src/main/java/net/minecraft/world/level/block/entity/FuelValues.java b/src/main/java/net/minecraft/world/level/block/entity/FuelValues.java
index 61ef08ac941b1e8988d001241780d3a1582f7a2d..2eab5b43ab654966d26424597c1f3baa919e8434 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/FuelValues.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/FuelValues.java
@@ -17,7 +17,7 @@ import net.minecraft.world.level.ItemLike;
 import net.minecraft.world.level.block.Blocks;
 
 public class FuelValues {
-    private final Object2IntSortedMap<Item> values;
+    public final Object2IntSortedMap<Item> values; // Purpur - private -> public
 
     FuelValues(Object2IntSortedMap<Item> fuelValues) {
         this.values = fuelValues;
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 6e92cc1832510a9ed776f54e43d596fe4f8831d9..7bc58c693db720ca75dc4925bfb8d41aa69f5b90 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -1617,6 +1617,22 @@ public final class CraftServer implements Server {
         return true;
     }
 
+    // Purpur Start
+    @Override
+    public void addFuel(org.bukkit.Material material, int burnTime) {
+        Preconditions.checkArgument(burnTime > 0, "BurnTime must be greater than 0");
+
+        net.minecraft.world.item.ItemStack itemStack = net.minecraft.world.item.ItemStack.fromBukkitCopy(new ItemStack(material));
+        MinecraftServer.getServer().fuelValues().values.put(itemStack.getItem(), burnTime);
+    }
+
+    @Override
+    public void removeFuel(org.bukkit.Material material) {
+        net.minecraft.world.item.ItemStack itemStack = net.minecraft.world.item.ItemStack.fromBukkitCopy(new ItemStack(material));
+        MinecraftServer.getServer().fuelValues().values.keySet().removeIf(itemStack::is);
+    }
+    // Purpur End
+
     @Override
     public List<Recipe> getRecipesFor(ItemStack result) {
         Preconditions.checkArgument(result != null, "ItemStack cannot be null");