Paper/patches/server/0771-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 14:34:55 -0700
Subject: [PATCH] Custom Potion Mixes


diff --git a/src/main/java/io/papermc/paper/potion/PaperPotionMix.java b/src/main/java/io/papermc/paper/potion/PaperPotionMix.java
new file mode 100644
index 0000000000000000000000000000000000000000..7ea357ac2f3a93db4ebdf24b5072be7d1cad3e33
--- /dev/null
+++ b/src/main/java/io/papermc/paper/potion/PaperPotionMix.java
@@ -0,0 +1,21 @@
+package io.papermc.paper.potion;
+
+import java.util.function.Predicate;
+import net.minecraft.world.item.ItemStack;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.craftbukkit.inventory.CraftRecipe;
+import org.bukkit.inventory.RecipeChoice;
+
+public record PaperPotionMix(ItemStack result, Predicate<ItemStack> input, Predicate<ItemStack> ingredient) {
+
+    public PaperPotionMix(PotionMix potionMix) {
+        this(CraftItemStack.asNMSCopy(potionMix.getResult()), convert(potionMix.getInput()), convert(potionMix.getIngredient()));
+    }
+
+    static Predicate<ItemStack> convert(final RecipeChoice choice) {
+        if (choice instanceof PredicateRecipeChoice predicateRecipeChoice) {
+            return stack -> predicateRecipeChoice.test(CraftItemStack.asBukkitCopy(stack));
+        }
+        return CraftRecipe.toIngredient(choice, true);
+    }
+}
diff --git a/src/main/java/net/minecraft/world/inventory/BrewingStandMenu.java b/src/main/java/net/minecraft/world/inventory/BrewingStandMenu.java
index ad012400d76c263bf26cfa07e2e24f26dc32276b..82311188348d673d83b70bf4d5357ecee562b6d6 100644
--- a/src/main/java/net/minecraft/world/inventory/BrewingStandMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/BrewingStandMenu.java
@@ -169,7 +169,7 @@ public class BrewingStandMenu extends AbstractContainerMenu {
         }
 
         public static boolean mayPlaceItem(ItemStack stack) {
-            return stack.is(Items.POTION) || stack.is(Items.SPLASH_POTION) || stack.is(Items.LINGERING_POTION) || stack.is(Items.GLASS_BOTTLE);
+            return stack.is(Items.POTION) || stack.is(Items.SPLASH_POTION) || stack.is(Items.LINGERING_POTION) || stack.is(Items.GLASS_BOTTLE) || PotionBrewing.isCustomInput(stack); // Paper
         }
     }
 
diff --git a/src/main/java/net/minecraft/world/item/alchemy/PotionBrewing.java b/src/main/java/net/minecraft/world/item/alchemy/PotionBrewing.java
index 25e909b90293855321b8f05ab3488bad8c064853..ef798adc296ae1595cfcd33fed5aa71b9ad00037 100644
--- a/src/main/java/net/minecraft/world/item/alchemy/PotionBrewing.java
+++ b/src/main/java/net/minecraft/world/item/alchemy/PotionBrewing.java
@@ -14,6 +14,7 @@ public class PotionBrewing {
     public static final int BREWING_TIME_SECONDS = 20;
     private static final List<PotionBrewing.Mix<Potion>> POTION_MIXES = Lists.newArrayList();
     private static final List<PotionBrewing.Mix<Item>> CONTAINER_MIXES = Lists.newArrayList();
+    private static final it.unimi.dsi.fastutil.objects.Object2ObjectLinkedOpenHashMap<org.bukkit.NamespacedKey, io.papermc.paper.potion.PaperPotionMix> CUSTOM_MIXES = new it.unimi.dsi.fastutil.objects.Object2ObjectLinkedOpenHashMap<>(); // Paper
     private static final List<Ingredient> ALLOWED_CONTAINERS = Lists.newArrayList();
     private static final Predicate<ItemStack> ALLOWED_CONTAINER = (stack) -> {
         for(Ingredient ingredient : ALLOWED_CONTAINERS) {
@@ -26,7 +27,7 @@ public class PotionBrewing {
     };
 
     public static boolean isIngredient(ItemStack stack) {
-        return isContainerIngredient(stack) || isPotionIngredient(stack);
+        return isContainerIngredient(stack) || isPotionIngredient(stack) || isCustomIngredient(stack); // Paper
     }
 
     protected static boolean isContainerIngredient(ItemStack stack) {
@@ -60,6 +61,11 @@ public class PotionBrewing {
     }
 
     public static boolean hasMix(ItemStack input, ItemStack ingredient) {
+        // Paper start
+        if (hasCustomMix(input, ingredient)) {
+            return true;
+        }
+        // Paper end
         if (!ALLOWED_CONTAINER.test(input)) {
             return false;
         } else {
@@ -93,6 +99,13 @@ public class PotionBrewing {
 
     public static ItemStack mix(ItemStack ingredient, ItemStack input) {
         if (!input.isEmpty()) {
+            // Paper start
+            for (var mix : CUSTOM_MIXES.values()) {
+                if (mix.input().test(input) && mix.ingredient().test(ingredient)) {
+                    return mix.result().copy();
+                }
+            }
+            // Paper end
             Potion potion = PotionUtils.getPotion(input);
             Item item = input.getItem();
 
@@ -112,6 +125,54 @@ public class PotionBrewing {
         return input;
     }
 
+    // Paper start
+    public static boolean isCustomIngredient(ItemStack stack) {
+        for (var mix : CUSTOM_MIXES.values()) {
+            if (mix.ingredient().test(stack)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static boolean isCustomInput(ItemStack stack) {
+        for (var mix : CUSTOM_MIXES.values()) {
+            if (mix.input().test(stack)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static boolean hasCustomMix(ItemStack input, ItemStack ingredient) {
+        for (var mix : CUSTOM_MIXES.values()) {
+            if (mix.input().test(input) && mix.ingredient().test(ingredient)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static void addPotionMix(io.papermc.paper.potion.PotionMix mix) {
+        if (CUSTOM_MIXES.containsKey(mix.getKey())) {
+            throw new IllegalArgumentException("Duplicate recipe ignored with ID " + mix.getKey());
+        }
+        CUSTOM_MIXES.putAndMoveToFirst(mix.getKey(), new io.papermc.paper.potion.PaperPotionMix(mix));
+    }
+
+    public static boolean removePotionMix(org.bukkit.NamespacedKey key) {
+        return CUSTOM_MIXES.remove(key) != null;
+    }
+
+    public static void reload() {
+        POTION_MIXES.clear();
+        CONTAINER_MIXES.clear();
+        ALLOWED_CONTAINERS.clear();
+        CUSTOM_MIXES.clear();
+        bootStrap();
+    }
+    // Paper end
+
     public static void bootStrap() {
         addContainer(Items.POTION);
         addContainer(Items.SPLASH_POTION);
diff --git a/src/main/java/net/minecraft/world/level/block/entity/BrewingStandBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BrewingStandBlockEntity.java
index 424406d2692856cfd82b6f3b7b6228fa3bd20c2f..c57efcb9a79337ec791e4e8f6671612f0a82b441 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BrewingStandBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BrewingStandBlockEntity.java
@@ -341,7 +341,7 @@ public class BrewingStandBlockEntity extends BaseContainerBlockEntity implements
 
     @Override
     public boolean canPlaceItem(int slot, ItemStack stack) {
-        return slot == 3 ? PotionBrewing.isIngredient(stack) : (slot == 4 ? stack.is(Items.BLAZE_POWDER) : (stack.is(Items.POTION) || stack.is(Items.SPLASH_POTION) || stack.is(Items.LINGERING_POTION) || stack.is(Items.GLASS_BOTTLE)) && this.getItem(slot).isEmpty());
+        return slot == 3 ? PotionBrewing.isIngredient(stack) : (slot == 4 ? stack.is(Items.BLAZE_POWDER) : (stack.is(Items.POTION) || stack.is(Items.SPLASH_POTION) || stack.is(Items.LINGERING_POTION) || stack.is(Items.GLASS_BOTTLE) || PotionBrewing.isCustomInput(stack)) && this.getItem(slot).isEmpty()); // Paper
     }
 
     @Override
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 1cf55dc3c358f5f2e0cb5acefc550699e021c1d9..ab8d2d5a8cde5174412e6c1c8d37816999ad09e2 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -309,6 +309,7 @@ public final class CraftServer implements Server {
     private final io.papermc.paper.datapack.PaperDatapackManager datapackManager; // Paper
     public static Exception excessiveVelEx; // Paper - Velocity warnings
     private final io.papermc.paper.logging.SysoutCatcher sysoutCatcher = new io.papermc.paper.logging.SysoutCatcher(); // Paper
+    private final CraftPotionBrewer potionBrewer = new CraftPotionBrewer(); // Paper
 
     static {
         ConfigurationSerialization.registerClass(CraftOfflinePlayer.class);
@@ -334,7 +335,7 @@ public final class CraftServer implements Server {
 
         CraftRegistry.setMinecraftRegistry(console.registryAccess());
 
-        Potion.setPotionBrewer(new CraftPotionBrewer());
+        Potion.setPotionBrewer(potionBrewer); // Paper
         // Ugly hack :(
 
         if (!Main.useConsole) {
@@ -3072,5 +3073,10 @@ public final class CraftServer implements Server {
         return datapackManager;
     }
 
+    @Override
+    public CraftPotionBrewer getPotionBrewer() {
+        return this.potionBrewer;
+    }
+
     // Paper end
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java
index 28fac26aa8e4da52f3e5d8e5e0d2e2731bcf74e1..13d25d118eb4d3ef35a4cdfb9bbde9ed83f6c04b 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java
@@ -16,6 +16,11 @@ public interface CraftRecipe extends Recipe {
     void addToCraftingManager();
 
     default Ingredient toNMS(RecipeChoice bukkit, boolean requireNotEmpty) {
+        // Paper start
+        return toIngredient(bukkit, requireNotEmpty);
+    }
+    static Ingredient toIngredient(RecipeChoice bukkit, boolean requireNotEmpty) {
+        // Paper end
         Ingredient stack;
 
         if (bukkit == null) {