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 35b41bceeba72c3896c91c2605bac3b0bf9c54e9..5c028f957661089ff502109c996692856b12ee27 100644
--- a/src/main/java/net/minecraft/world/inventory/AbstractFurnaceMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/AbstractFurnaceMenu.java
@@ -145,7 +145,13 @@ public abstract class AbstractFurnaceMenu extends RecipeBookMenu<Container> {
             } 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/AbstractFurnaceBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
index ca2052804ad829a1528a9c5a0a792275beead113..997d0fab71eacc6466ffe3bc8f6349e5813d6d49 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
@@ -208,6 +208,22 @@ public abstract class AbstractFurnaceBlockEntity extends BaseContainerBlockEntit
         // Paper end
     }
 
+    // Purpur start
+    public static void addFuel(ItemStack itemStack, Integer burnTime) {
+        Map<Item, Integer> map = Maps.newLinkedHashMap();
+        map.putAll(getFuel());
+        map.put(itemStack.getItem(), burnTime);
+        cachedBurnDurations = com.google.common.collect.ImmutableMap.copyOf(map);
+    }
+
+    public static void removeFuel(ItemStack itemStack) {
+        Map<Item, Integer> map = Maps.newLinkedHashMap();
+        map.putAll(getFuel());
+        map.remove(itemStack.getItem());
+        cachedBurnDurations = com.google.common.collect.ImmutableMap.copyOf(map);
+    }
+    // Purpur End
+
     // CraftBukkit start - add fields and methods
     private int maxStack = MAX_STACK;
     public List<HumanEntity> transaction = new java.util.ArrayList<HumanEntity>();
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 08df637e9d8f08c14392b2dd61240cd4f1a48f76..6403d721e7ab1f2251d4c083c4580797f71647bd 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -1453,6 +1453,19 @@ 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.level.block.entity.AbstractFurnaceBlockEntity.addFuel(net.minecraft.world.item.ItemStack.fromBukkitCopy(new ItemStack(material)), burnTime);
+    }
+
+    @Override
+    public void removeFuel(org.bukkit.Material material) {
+        net.minecraft.world.level.block.entity.AbstractFurnaceBlockEntity.removeFuel(net.minecraft.world.item.ItemStack.fromBukkitCopy(new ItemStack(material)));
+    }
+    // Purpur End
+
     @Override
     public List<Recipe> getRecipesFor(ItemStack result) {
         Preconditions.checkArgument(result != null, "ItemStack cannot be null");