From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sun, 25 Jun 2023 23:10:14 -0700
Subject: [PATCH] Improve exact choice recipe ingredients

Fixes exact choices not working with recipe book clicks
and shapeless recipes.

== AT ==
public net.minecraft.world.item.ItemStackLinkedSet TYPE_AND_TAG
public net.minecraft.world.entity.player.StackedContents put(II)V

diff --git a/src/main/java/io/papermc/paper/inventory/recipe/RecipeBookExactChoiceRecipe.java b/src/main/java/io/papermc/paper/inventory/recipe/RecipeBookExactChoiceRecipe.java
new file mode 100644
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
--- /dev/null
+++ b/src/main/java/io/papermc/paper/inventory/recipe/RecipeBookExactChoiceRecipe.java
@@ -0,0 +0,0 @@
+package io.papermc.paper.inventory.recipe;
+
+import net.minecraft.world.Container;
+import net.minecraft.world.item.crafting.Ingredient;
+import net.minecraft.world.item.crafting.Recipe;
+
+public abstract class RecipeBookExactChoiceRecipe<C extends Container> implements Recipe<C> {
+
+    private boolean hasExactIngredients;
+
+    protected final void checkExactIngredients() {
+        // skip any special recipes
+        if (this.isSpecial()) {
+            this.hasExactIngredients = false;
+            return;
+        }
+        for (final Ingredient ingredient : this.getIngredients()) {
+            if (!ingredient.isEmpty() && ingredient.exact) {
+                this.hasExactIngredients = true;
+                return;
+            }
+        }
+        this.hasExactIngredients = false;
+    }
+
+    @Override
+    public final boolean hasExactIngredients() {
+        return this.hasExactIngredients;
+    }
+}
diff --git a/src/main/java/io/papermc/paper/inventory/recipe/StackedContentsExtraMap.java b/src/main/java/io/papermc/paper/inventory/recipe/StackedContentsExtraMap.java
new file mode 100644
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
--- /dev/null
+++ b/src/main/java/io/papermc/paper/inventory/recipe/StackedContentsExtraMap.java
@@ -0,0 +0,0 @@
+package io.papermc.paper.inventory.recipe;
+
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.ints.IntArrayList;
+import it.unimi.dsi.fastutil.ints.IntComparators;
+import it.unimi.dsi.fastutil.ints.IntList;
+import it.unimi.dsi.fastutil.objects.Object2IntMap;
+import it.unimi.dsi.fastutil.objects.Object2IntOpenCustomHashMap;
+import java.util.IdentityHashMap;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.world.entity.player.StackedContents;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.ItemStackLinkedSet;
+import net.minecraft.world.item.crafting.Ingredient;
+import net.minecraft.world.item.crafting.Recipe;
+
+public final class StackedContentsExtraMap {
+
+    private final AtomicInteger idCounter = new AtomicInteger(BuiltInRegistries.ITEM.size()); // start at max vanilla stacked contents idx
+    private final Object2IntMap<ItemStack> exactChoiceIds = new Object2IntOpenCustomHashMap<>(ItemStackLinkedSet.TYPE_AND_TAG);
+    private final Int2ObjectMap<ItemStack> idToExactChoice = new Int2ObjectOpenHashMap<>();
+    private final StackedContents contents;
+    public final Map<Ingredient, IntList> extraStackingIds = new IdentityHashMap<>();
+
+    public StackedContentsExtraMap(final StackedContents contents, final Recipe<?> recipe) {
+        this.exactChoiceIds.defaultReturnValue(-1);
+        this.contents = contents;
+        this.initialize(recipe);
+    }
+
+    private void initialize(final Recipe<?> recipe) {
+        if (recipe.hasExactIngredients()) {
+            for (final Ingredient ingredient : recipe.getIngredients()) {
+                if (!ingredient.isEmpty() && ingredient.exact) {
+                    final net.minecraft.world.item.ItemStack[] items = ingredient.getItems();
+                    final IntList idList = new IntArrayList(items.length);
+                    for (final ItemStack item : items) {
+                        idList.add(this.registerExact(item)); // I think not copying the stack here is safe because cb copies the stack when creating the ingredient
+                        if (item.getComponentsPatch().isEmpty()) {
+                            // add regular index if it's a plain itemstack but still registered as exact
+                            idList.add(StackedContents.getStackingIndex(item));
+                        }
+                    }
+                    idList.sort(IntComparators.NATURAL_COMPARATOR);
+                    this.extraStackingIds.put(ingredient, idList);
+                }
+            }
+        }
+    }
+
+    private int registerExact(final ItemStack exactChoice) {
+        final int existing = this.exactChoiceIds.getInt(exactChoice);
+        if (existing > -1) {
+            return existing;
+        }
+        final int id = this.idCounter.getAndIncrement();
+        this.exactChoiceIds.put(exactChoice, id);
+        this.idToExactChoice.put(id, exactChoice);
+        return id;
+    }
+
+    public ItemStack getById(int id) {
+        return this.idToExactChoice.get(id);
+    }
+
+    public boolean accountStack(final ItemStack stack, final int count) {
+        if (!this.exactChoiceIds.isEmpty()) {
+            final int id = this.exactChoiceIds.getInt(stack);
+            if (id >= 0) {
+                this.contents.put(id, count);
+                return true;
+            }
+        }
+        return false;
+    }
+}
diff --git a/src/main/java/io/papermc/paper/inventory/recipe/package-info.java b/src/main/java/io/papermc/paper/inventory/recipe/package-info.java
new file mode 100644
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
--- /dev/null
+++ b/src/main/java/io/papermc/paper/inventory/recipe/package-info.java
@@ -0,0 +0,0 @@
+@DefaultQualifier(NonNull.class)
+package io.papermc.paper.inventory.recipe;
+
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
diff --git a/src/main/java/net/minecraft/recipebook/ServerPlaceRecipe.java b/src/main/java/net/minecraft/recipebook/ServerPlaceRecipe.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/recipebook/ServerPlaceRecipe.java
+++ b/src/main/java/net/minecraft/recipebook/ServerPlaceRecipe.java
@@ -0,0 +0,0 @@ public class ServerPlaceRecipe<C extends Container> implements PlaceRecipe<Integ
             this.inventory = entity.getInventory();
             if (this.testClearGrid() || entity.isCreative()) {
                 this.stackedContents.clear();
+                this.stackedContents.initialize(recipe.value()); // Paper - Improve exact choice recipe ingredients
                 entity.getInventory().fillStackedContents(this.stackedContents);
                 this.menu.fillCraftSlotsStackedContents(this.stackedContents);
                 if (this.stackedContents.canCraft((Recipe<?>)recipe.value(), null)) {
@@ -0,0 +0,0 @@ public class ServerPlaceRecipe<C extends Container> implements PlaceRecipe<Integ
             int l = k;
 
             for (int m : intList) {
-                ItemStack itemStack2 = StackedContents.fromStackingIndex(m);
+                ItemStack itemStack2 = StackedContents.fromStackingIndexWithExtras(m, this.stackedContents); // Paper - Improve exact choice recipe ingredients
                 if (!itemStack2.isEmpty()) {
                     int n = itemStack2.getMaxStackSize();
                     if (n < l) {
@@ -0,0 +0,0 @@ public class ServerPlaceRecipe<C extends Container> implements PlaceRecipe<Integ
     @Override
     public void addItemToSlot(Iterator<Integer> inputs, int slot, int amount, int gridX, int gridY) {
         Slot slot2 = this.menu.getSlot(slot);
-        ItemStack itemStack = StackedContents.fromStackingIndex(inputs.next());
+        // Paper start - Improve exact choice recipe ingredients
+        final int itemId = inputs.next();
+        ItemStack itemStack = null;
+        boolean isExact = false;
+        if (this.stackedContents.extrasMap != null && itemId >= net.minecraft.core.registries.BuiltInRegistries.ITEM.size()) {
+            itemStack = StackedContents.fromStackingIndexExtras(itemId, this.stackedContents.extrasMap).copy();
+            isExact = true;
+        }
+        if (itemStack == null) {
+            itemStack = StackedContents.fromStackingIndex(itemId);
+        }
+        // Paper end - Improve exact choice recipe ingredients
         if (!itemStack.isEmpty()) {
             for (int i = 0; i < amount; i++) {
-                this.moveItemToGrid(slot2, itemStack);
+                this.moveItemToGrid(slot2, itemStack, isExact); // Paper - Improve exact choice recipe ingredients
             }
         }
     }
@@ -0,0 +0,0 @@ public class ServerPlaceRecipe<C extends Container> implements PlaceRecipe<Integ
         return i;
     }
 
+    @Deprecated @io.papermc.paper.annotation.DoNotUse // Paper - Improve exact choice recipe ingredients
     protected void moveItemToGrid(Slot slot, ItemStack stack) {
-        int i = this.inventory.findSlotMatchingUnusedItem(stack);
+        // Paper start - Improve exact choice recipe ingredients
+        this.moveItemToGrid(slot, stack, false);
+    }
+    protected void moveItemToGrid(Slot slot, ItemStack stack, final boolean isExact) {
+        int i = isExact ? this.inventory.findSlotMatchingItem(stack) : this.inventory.findSlotMatchingUnusedItem(stack);
+        // Paper end - Improve exact choice recipe ingredients
         if (i != -1) {
             ItemStack itemStack = this.inventory.getItem(i);
             if (!itemStack.isEmpty()) {
diff --git a/src/main/java/net/minecraft/world/entity/player/StackedContents.java b/src/main/java/net/minecraft/world/entity/player/StackedContents.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/entity/player/StackedContents.java
+++ b/src/main/java/net/minecraft/world/entity/player/StackedContents.java
@@ -0,0 +0,0 @@ import net.minecraft.world.item.crafting.RecipeHolder;
 public class StackedContents {
     private static final int EMPTY = 0;
     public final Int2IntMap contents = new Int2IntOpenHashMap();
+    @Nullable public io.papermc.paper.inventory.recipe.StackedContentsExtraMap extrasMap = null; // Paper - Improve exact choice recipe ingredients
 
     public void accountSimpleStack(ItemStack stack) {
+        if (this.extrasMap != null && !stack.getComponentsPatch().isEmpty() && this.extrasMap.accountStack(stack, Math.min(64, stack.getCount()))) return; // Paper - Improve exact choice recipe ingredients; max of 64 due to accountStack method below
         if (!stack.isDamaged() && !stack.isEnchanted() && !stack.has(DataComponents.CUSTOM_NAME)) {
             this.accountStack(stack);
         }
@@ -0,0 +0,0 @@ public class StackedContents {
         if (!stack.isEmpty()) {
             int i = getStackingIndex(stack);
             int j = Math.min(maxCount, stack.getCount());
+            if (this.extrasMap != null && !stack.getComponentsPatch().isEmpty() && this.extrasMap.accountStack(stack, j)) return; // Paper - Improve exact choice recipe ingredients; if an exact ingredient, don't include it
             this.put(i, j);
         }
     }
@@ -0,0 +0,0 @@ public class StackedContents {
         return itemId == 0 ? ItemStack.EMPTY : new ItemStack(Item.byId(itemId));
     }
 
+    // Paper start - Improve exact choice recipe ingredients
+    public void initialize(final Recipe<?> recipe) {
+        this.extrasMap = new io.papermc.paper.inventory.recipe.StackedContentsExtraMap(this, recipe);
+    }
+
+    public static ItemStack fromStackingIndexWithExtras(final int itemId, @Nullable final StackedContents contents) {
+        if (contents != null && contents.extrasMap != null && itemId >= BuiltInRegistries.ITEM.size()) {
+            return fromStackingIndexExtras(itemId, contents.extrasMap);
+        }
+        return fromStackingIndex(itemId);
+    }
+
+    public static ItemStack fromStackingIndexExtras(final int itemId, final io.papermc.paper.inventory.recipe.StackedContentsExtraMap extrasMap) {
+        return extrasMap.getById(itemId).copy();
+    }
+    // Paper end - Improve exact choice recipe ingredients
+
     public void clear() {
         this.contents.clear();
     }
@@ -0,0 +0,0 @@ public class StackedContents {
             this.data = new BitSet(this.ingredientCount + this.itemCount + this.ingredientCount + this.ingredientCount * this.itemCount);
 
             for (int i = 0; i < this.ingredients.size(); i++) {
-                IntList intList = this.ingredients.get(i).getStackingIds();
+                IntList intList = this.getStackingIds(this.ingredients.get(i)); // Paper - Improve exact choice recipe ingredients
 
                 for (int j = 0; j < this.itemCount; j++) {
                     if (intList.contains(this.items[j])) {
@@ -0,0 +0,0 @@ public class StackedContents {
             IntCollection intCollection = new IntAVLTreeSet();
 
             for (Ingredient ingredient : this.ingredients) {
-                intCollection.addAll(ingredient.getStackingIds());
+                intCollection.addAll(this.getStackingIds(ingredient)); // Paper - Improve exact choice recipe ingredients
             }
 
             IntIterator intIterator = intCollection.iterator();
@@ -0,0 +0,0 @@ public class StackedContents {
             for (Ingredient ingredient : this.ingredients) {
                 int j = 0;
 
-                for (int k : ingredient.getStackingIds()) {
+                for (int k : this.getStackingIds(ingredient)) { // Paper - Improve exact choice recipe ingredients
                     j = Math.max(j, StackedContents.this.contents.get(k));
                 }
 
@@ -0,0 +0,0 @@ public class StackedContents {
 
             return i;
         }
+
+        // Paper start - Improve exact choice recipe ingredients
+        private IntList getStackingIds(final Ingredient ingredient) {
+            if (StackedContents.this.extrasMap != null) {
+                final IntList ids = StackedContents.this.extrasMap.extraStackingIds.get(ingredient);
+                if (ids != null) {
+                    return ids;
+                }
+            }
+            return ingredient.getStackingIds();
+        }
+        // Paper end - Improve exact choice recipe ingredients
     }
 }
diff --git a/src/main/java/net/minecraft/world/item/crafting/AbstractCookingRecipe.java b/src/main/java/net/minecraft/world/item/crafting/AbstractCookingRecipe.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/item/crafting/AbstractCookingRecipe.java
+++ b/src/main/java/net/minecraft/world/item/crafting/AbstractCookingRecipe.java
@@ -0,0 +0,0 @@ import net.minecraft.world.Container;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.level.Level;
 
-public abstract class AbstractCookingRecipe implements Recipe<Container> {
+public abstract class AbstractCookingRecipe extends io.papermc.paper.inventory.recipe.RecipeBookExactChoiceRecipe<Container> implements Recipe<Container> { // Paper - improve exact recipe choices
     protected final RecipeType<?> type;
     protected final CookingBookCategory category;
     protected final String group;
@@ -0,0 +0,0 @@ public abstract class AbstractCookingRecipe implements Recipe<Container> {
         this.result = result;
         this.experience = experience;
         this.cookingTime = cookingTime;
+        this.checkExactIngredients(); // Paper - improve exact recipe choices
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/world/item/crafting/Recipe.java b/src/main/java/net/minecraft/world/item/crafting/Recipe.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/item/crafting/Recipe.java
+++ b/src/main/java/net/minecraft/world/item/crafting/Recipe.java
@@ -0,0 +0,0 @@ public interface Recipe<C extends Container> {
     }
 
     org.bukkit.inventory.Recipe toBukkitRecipe(org.bukkit.NamespacedKey id); // CraftBukkit
+
+    // Paper start - improved exact choice recipes
+    default boolean hasExactIngredients() {
+        return false;
+    }
+    // Paper end
 }
diff --git a/src/main/java/net/minecraft/world/item/crafting/ShapedRecipe.java b/src/main/java/net/minecraft/world/item/crafting/ShapedRecipe.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/item/crafting/ShapedRecipe.java
+++ b/src/main/java/net/minecraft/world/item/crafting/ShapedRecipe.java
@@ -0,0 +0,0 @@ import org.bukkit.craftbukkit.inventory.CraftShapedRecipe;
 import org.bukkit.inventory.RecipeChoice;
 // CraftBukkit end
 
-public class ShapedRecipe implements CraftingRecipe {
+public class ShapedRecipe extends io.papermc.paper.inventory.recipe.RecipeBookExactChoiceRecipe<CraftingContainer> implements CraftingRecipe { // Paper - improve exact recipe choices
 
     final ShapedRecipePattern pattern;
     final ItemStack result;
@@ -0,0 +0,0 @@ public class ShapedRecipe implements CraftingRecipe {
         this.pattern = raw;
         this.result = result;
         this.showNotification = showNotification;
+        this.checkExactIngredients(); // Paper - improve exact recipe choices
     }
 
     public ShapedRecipe(String group, CraftingBookCategory category, ShapedRecipePattern raw, ItemStack result) {
diff --git a/src/main/java/net/minecraft/world/item/crafting/ShapelessRecipe.java b/src/main/java/net/minecraft/world/item/crafting/ShapelessRecipe.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/item/crafting/ShapelessRecipe.java
+++ b/src/main/java/net/minecraft/world/item/crafting/ShapelessRecipe.java
@@ -0,0 +0,0 @@ import org.bukkit.craftbukkit.inventory.CraftRecipe;
 import org.bukkit.craftbukkit.inventory.CraftShapelessRecipe;
 // CraftBukkit end
 
-public class ShapelessRecipe implements CraftingRecipe {
+public class ShapelessRecipe extends io.papermc.paper.inventory.recipe.RecipeBookExactChoiceRecipe<CraftingContainer> implements CraftingRecipe { // Paper - improve exact recipe choices
 
     final String group;
     final CraftingBookCategory category;
@@ -0,0 +0,0 @@ public class ShapelessRecipe implements CraftingRecipe {
         this.category = category;
         this.result = result;
         this.ingredients = ingredients;
+        this.checkExactIngredients(); // Paper - improve exact recipe choices
     }
 
     // CraftBukkit start
@@ -0,0 +0,0 @@ public class ShapelessRecipe implements CraftingRecipe {
 
     public boolean matches(CraftingContainer inventory, Level world) {
         StackedContents autorecipestackmanager = new StackedContents();
+        autorecipestackmanager.initialize(this); // Paper - better exact choice recipes
         int i = 0;
 
         for (int j = 0; j < inventory.getContainerSize(); ++j) {
