Paper/patches/api/0351-Custom-Potion-Mixes.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Thu, 7 Oct 2021 14:34:59 -0700
Subject: [PATCH] Custom Potion Mixes


diff --git a/src/main/java/io/papermc/paper/potion/PotionMix.java b/src/main/java/io/papermc/paper/potion/PotionMix.java
new file mode 100644
index 0000000000000000000000000000000000000000..3fc922ebf972418b84181cd02e68d8ef0efd739b
--- /dev/null
+++ b/src/main/java/io/papermc/paper/potion/PotionMix.java
@@ -0,0 +1,105 @@
+package io.papermc.paper.potion;
+
+import java.util.function.Predicate;
+import org.bukkit.Keyed;
+import org.bukkit.NamespacedKey;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.RecipeChoice;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Objects;
+
+/**
+ * Represents a potion mix made in a Brewing Stand.
+ */
+@ApiStatus.NonExtendable
+public class PotionMix implements Keyed {
+
+    private final NamespacedKey key;
+    private final ItemStack result;
+    private final RecipeChoice input;
+    private final RecipeChoice ingredient;
+
+    /**
+     * Creates a new potion mix. Add it to the server with {@link org.bukkit.potion.PotionBrewer#addPotionMix(PotionMix)}.
+     *
+     * @param key a unique key for the mix
+     * @param result the resulting itemstack that will appear in the 3 bottom slots
+     * @param input the input placed into the bottom 3 slots
+     * @param ingredient the ingredient placed into the top slot
+     */
+    public PotionMix(final @NotNull NamespacedKey key, final @NotNull ItemStack result, final @NotNull RecipeChoice input, final @NotNull RecipeChoice ingredient) {
+        this.key = key;
+        this.result = result;
+        this.input = input;
+        this.ingredient = ingredient;
+    }
+
+    /**
+     * Create a {@link RecipeChoice} based on a Predicate. These RecipeChoices are only
+     * valid for {@link PotionMix}, not anywhere else RecipeChoices may be used.
+     *
+     * @param stackPredicate a predicate for an itemstack.
+     * @return a new RecipeChoice
+     */
+    @Contract(value = "_ -> new", pure = true)
+    public static @NotNull RecipeChoice createPredicateChoice(final @NotNull Predicate<? super ItemStack> stackPredicate) {
+        return new PredicateRecipeChoice(stackPredicate);
+    }
+
+    @Override
+    public @NotNull NamespacedKey getKey() {
+        return this.key;
+    }
+
+    /**
+     * Gets the resulting itemstack after the brew has finished.
+     *
+     * @return the result itemstack
+     */
+    public @NotNull ItemStack getResult() {
+        return this.result;
+    }
+
+    /**
+     * Gets the input for the bottom 3 slots in the brewing stand.
+     *
+     * @return the bottom 3 slot ingredients
+     */
+    public @NotNull RecipeChoice getInput() {
+        return this.input;
+    }
+
+    /**
+     * Gets the ingredient in the top slot of the brewing stand.
+     *
+     * @return the top slot input
+     */
+    public @NotNull RecipeChoice getIngredient() {
+        return this.ingredient;
+    }
+
+    @Override
+    public String toString() {
+        return "PotionMix{" +
+            "result=" + this.result +
+            ", base=" + this.input +
+            ", addition=" + this.ingredient +
+            '}';
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) return true;
+        if (o == null || this.getClass() != o.getClass()) return false;
+        final PotionMix potionMix = (PotionMix) o;
+        return this.key.equals(potionMix.key) && this.result.equals(potionMix.result) && this.input.equals(potionMix.input) && this.ingredient.equals(potionMix.ingredient);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.key, this.result, this.input, this.ingredient);
+    }
+}
diff --git a/src/main/java/io/papermc/paper/potion/PredicateRecipeChoice.java b/src/main/java/io/papermc/paper/potion/PredicateRecipeChoice.java
new file mode 100644
index 0000000000000000000000000000000000000000..3ede1e8f7bf0436fdc5bf395c0f9eaf11c252453
--- /dev/null
+++ b/src/main/java/io/papermc/paper/potion/PredicateRecipeChoice.java
@@ -0,0 +1,33 @@
+package io.papermc.paper.potion;
+
+import java.util.function.Predicate;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.RecipeChoice;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+import org.jetbrains.annotations.ApiStatus;
+
+@ApiStatus.Internal
+@DefaultQualifier(NonNull.class)
+record PredicateRecipeChoice(Predicate<? super ItemStack> itemStackPredicate) implements RecipeChoice, Cloneable {
+
+    @Override
+    @Deprecated
+    public ItemStack getItemStack() {
+        throw new UnsupportedOperationException("PredicateRecipeChoice does not support this");
+    }
+
+    @Override
+    public RecipeChoice clone() {
+        try {
+            return (PredicateRecipeChoice) super.clone();
+        } catch (final CloneNotSupportedException ex) {
+            throw new AssertionError(ex);
+        }
+    }
+
+    @Override
+    public boolean test(final ItemStack itemStack) {
+        return this.itemStackPredicate.test(itemStack);
+    }
+}
diff --git a/src/main/java/org/bukkit/Bukkit.java b/src/main/java/org/bukkit/Bukkit.java
index 5e8518372a30595f5f8f254e31a130645e75772e..011d4e3c6fe3ffb0636506f5447c0097b297a957 100644
--- a/src/main/java/org/bukkit/Bukkit.java
+++ b/src/main/java/org/bukkit/Bukkit.java
@@ -2568,6 +2568,15 @@ public final class Bukkit {
     public static io.papermc.paper.datapack.DatapackManager getDatapackManager() {
         return server.getDatapackManager();
     }
+
+    /**
+     * Gets the potion brewer.
+     *
+     * @return the potion brewer
+     */
+    public static @NotNull org.bukkit.potion.PotionBrewer getPotionBrewer() {
+        return server.getPotionBrewer();
+    }
     // Paper end
 
     @NotNull
diff --git a/src/main/java/org/bukkit/Server.java b/src/main/java/org/bukkit/Server.java
index 204e68a63cf32d3b58a9fadabde5780608f47421..5e5b5aedeaaca24aebe59ec2cfd0adde2ca4a7f5 100644
--- a/src/main/java/org/bukkit/Server.java
+++ b/src/main/java/org/bukkit/Server.java
@@ -2238,5 +2238,12 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
      */
     @NotNull
     io.papermc.paper.datapack.DatapackManager getDatapackManager();
+
+    /**
+     * Gets the potion brewer.
+     *
+     * @return the potion brewer
+     */
+    @NotNull org.bukkit.potion.PotionBrewer getPotionBrewer();
     // Paper end
 }
diff --git a/src/main/java/org/bukkit/potion/PotionBrewer.java b/src/main/java/org/bukkit/potion/PotionBrewer.java
index 2072f048e10eba829cef047d854b5a22c8f055a3..eb189e170bc4975c5378f95f86ecf2cc880bd931 100644
--- a/src/main/java/org/bukkit/potion/PotionBrewer.java
+++ b/src/main/java/org/bukkit/potion/PotionBrewer.java
@@ -45,4 +45,25 @@ public interface PotionBrewer {
     @NotNull
     @Deprecated
     public Collection<PotionEffect> getEffects(@NotNull PotionType type, boolean upgraded, boolean extended);
+
+    // Paper start
+    /**
+     * Adds a new potion mix recipe.
+     *
+     * @param potionMix the potion mix to add
+     */
+    void addPotionMix(@NotNull io.papermc.paper.potion.PotionMix potionMix);
+
+    /**
+     * Removes a potion mix recipe.
+     *
+     * @param key the key of the mix to remove
+     */
+    void removePotionMix(@NotNull org.bukkit.NamespacedKey key);
+
+    /**
+     * Resets potion mixes to their default, removing all custom ones.
+     */
+    void resetPotionMixes();
+    // Paper end
 }