From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: lexikiq <noellekiq@gmail.com>
Date: Tue, 13 Jul 2021 17:27:45 -0400
Subject: [PATCH] Add Furnace Recipe API

Temporary API to get the result of smelting an item in a (type of) furnace.

Will eventually (hopefully) be replaced by a more extensive Paper PR with support for all recipes.

diff --git a/src/main/java/gg/projecteden/parchment/inventory/RecipeType.java b/src/main/java/gg/projecteden/parchment/inventory/RecipeType.java
new file mode 100644
index 0000000000000000000000000000000000000000..ea17d99c7a1d70d88e2c439399cdb376b9dedf47
--- /dev/null
+++ b/src/main/java/gg/projecteden/parchment/inventory/RecipeType.java
@@ -0,0 +1,50 @@
+package gg.projecteden.parchment.inventory;
+
+/**
+ * A type of crafting recipe.
+ */
+public enum RecipeType {
+    /**
+     * Recipes crafted in the standard crafting table.
+     */
+    CRAFTING(false),
+    /**
+     * Recipes for smelting an item inside a furnace.
+     */
+    SMELTING(true),
+    /**
+     * Recipes for smelting an item inside a blasting furnace.
+     */
+    BLASTING(true),
+    /**
+     * Recipes for smelting an item inside a smoker.
+     */
+    SMOKING(true),
+    /**
+     * Recipes for cooking an item on a campfire.
+     */
+    CAMPFIRE_COOKING(true),
+    /**
+     * Recipes for carving stones in a stonecutter.
+     */
+    STONECUTTING(true),
+    /**
+     * Recipes for smithing an item in a smithing table.
+     */
+    SMITHING(false),
+    ;
+
+    private final boolean singleInput;
+
+    RecipeType(boolean singleInput) {
+        this.singleInput = singleInput;
+    }
+
+    /**
+     * Determines if the recipe only accepts a single item for input.
+     * @return true if the recipe only accepts a single item for input
+     */
+    public boolean isSingleInput() {
+        return singleInput;
+    }
+}
diff --git a/src/main/java/org/bukkit/World.java b/src/main/java/org/bukkit/World.java
index 97f97ea5c6aa513c439f86a9c82821e0f7d9cd1e..64c1287b7a668680e19f8c4c1a678abb0eb5d88e 100644
--- a/src/main/java/org/bukkit/World.java
+++ b/src/main/java/org/bukkit/World.java
@@ -52,6 +52,36 @@ import org.jetbrains.annotations.Nullable;
  */
 public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient, Metadatable, PersistentDataHolder, Keyed, net.kyori.adventure.audience.ForwardingAudience { // Paper
 
+    // Parchment start
+    /**
+     * Returns the item that will result from smelting the input item, if applicable.
+     *
+     * @param toSmelt the item to simulate smelting
+     * @return the resulting item, or null
+     */
+    @Nullable
+    default ItemStack smeltItem(@NotNull ItemStack toSmelt) {
+        return smeltItem(toSmelt, gg.projecteden.parchment.inventory.RecipeType.SMELTING);
+    }
+
+    /**
+     * Returns the item that will result from smelting the input item, if applicable.
+     * <p>
+     * Applicable values for {@code recipeType} are
+     * {@link gg.projecteden.parchment.inventory.RecipeType#SMELTING SMELTING},
+     * {@link gg.projecteden.parchment.inventory.RecipeType#BLASTING BLASTING},
+     * {@link gg.projecteden.parchment.inventory.RecipeType#SMOKING SMOKING},
+     * and {@link gg.projecteden.parchment.inventory.RecipeType#CAMPFIRE_COOKING CAMPFIRE_COOKING}.
+     * An {@link IllegalArgumentException} will be thrown if another value is supplied.
+     *
+     * @param toSmelt the item to simulate smelting
+     * @param recipeType type of furnace to simulate smelting
+     * @return the resulting item, or null
+     */
+    @Nullable
+    ItemStack smeltItem(@NotNull ItemStack toSmelt, gg.projecteden.parchment.inventory.@NotNull RecipeType recipeType);
+    // Parchment end
+
     // Paper start
     /**
      * @return The amount of Entities in this world