Code/net/minecraft/world/item/crafting/FireworkStarRecipe.java

package net.minecraft.world.item.crafting;

import it.unimi.dsi.fastutil.ints.IntArrayList;
import it.unimi.dsi.fastutil.ints.IntList;
import java.util.Map;
import net.minecraft.core.HolderLookup;
import net.minecraft.core.component.DataComponents;
import net.minecraft.world.item.DyeItem;
import net.minecraft.world.item.Item;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.item.Items;
import net.minecraft.world.item.component.FireworkExplosion;
import net.minecraft.world.level.Level;

public class FireworkStarRecipe extends CustomRecipe {
    private static final Map<Item, FireworkExplosion.Shape> SHAPE_BY_ITEM = Map.of(
        Items.FIRE_CHARGE,
        FireworkExplosion.Shape.LARGE_BALL,
        Items.FEATHER,
        FireworkExplosion.Shape.BURST,
        Items.GOLD_NUGGET,
        FireworkExplosion.Shape.STAR,
        Items.SKELETON_SKULL,
        FireworkExplosion.Shape.CREEPER,
        Items.WITHER_SKELETON_SKULL,
        FireworkExplosion.Shape.CREEPER,
        Items.CREEPER_HEAD,
        FireworkExplosion.Shape.CREEPER,
        Items.PLAYER_HEAD,
        FireworkExplosion.Shape.CREEPER,
        Items.DRAGON_HEAD,
        FireworkExplosion.Shape.CREEPER,
        Items.ZOMBIE_HEAD,
        FireworkExplosion.Shape.CREEPER,
        Items.PIGLIN_HEAD,
        FireworkExplosion.Shape.CREEPER
    );
    private static final Ingredient TRAIL_INGREDIENT = Ingredient.of(Items.DIAMOND);
    private static final Ingredient TWINKLE_INGREDIENT = Ingredient.of(Items.GLOWSTONE_DUST);
    private static final Ingredient GUNPOWDER_INGREDIENT = Ingredient.of(Items.GUNPOWDER);

    public FireworkStarRecipe(CraftingBookCategory p_251577_) {
        super(p_251577_);
    }

    public boolean matches(CraftingInput p_342190_, Level p_43896_) {
        if (p_342190_.ingredientCount() < 2) {
            return false;
        } else {
            boolean flag = false;
            boolean flag1 = false;
            boolean flag2 = false;
            boolean flag3 = false;
            boolean flag4 = false;

            for (int i = 0; i < p_342190_.size(); i++) {
                ItemStack itemstack = p_342190_.getItem(i);
                if (!itemstack.isEmpty()) {
                    if (SHAPE_BY_ITEM.containsKey(itemstack.getItem())) {
                        if (flag2) {
                            return false;
                        }

                        flag2 = true;
                    } else if (TWINKLE_INGREDIENT.test(itemstack)) {
                        if (flag4) {
                            return false;
                        }

                        flag4 = true;
                    } else if (TRAIL_INGREDIENT.test(itemstack)) {
                        if (flag3) {
                            return false;
                        }

                        flag3 = true;
                    } else if (GUNPOWDER_INGREDIENT.test(itemstack)) {
                        if (flag) {
                            return false;
                        }

                        flag = true;
                    } else {
                        if (!(itemstack.getItem() instanceof DyeItem)) {
                            return false;
                        }

                        flag1 = true;
                    }
                }
            }

            return flag && flag1;
        }
    }

    public ItemStack assemble(CraftingInput p_344010_, HolderLookup.Provider p_335220_) {
        FireworkExplosion.Shape fireworkexplosion$shape = FireworkExplosion.Shape.SMALL_BALL;
        boolean flag = false;
        boolean flag1 = false;
        IntList intlist = new IntArrayList();

        for (int i = 0; i < p_344010_.size(); i++) {
            ItemStack itemstack = p_344010_.getItem(i);
            if (!itemstack.isEmpty()) {
                FireworkExplosion.Shape fireworkexplosion$shape1 = SHAPE_BY_ITEM.get(itemstack.getItem());
                if (fireworkexplosion$shape1 != null) {
                    fireworkexplosion$shape = fireworkexplosion$shape1;
                } else if (TWINKLE_INGREDIENT.test(itemstack)) {
                    flag = true;
                } else if (TRAIL_INGREDIENT.test(itemstack)) {
                    flag1 = true;
                } else if (itemstack.getItem() instanceof DyeItem dyeitem) {
                    intlist.add(dyeitem.getDyeColor().getFireworkColor());
                }
            }
        }

        ItemStack itemstack1 = new ItemStack(Items.FIREWORK_STAR);
        itemstack1.set(DataComponents.FIREWORK_EXPLOSION, new FireworkExplosion(fireworkexplosion$shape, intlist, IntList.of(), flag1, flag));
        return itemstack1;
    }

    @Override
    public RecipeSerializer<FireworkStarRecipe> getSerializer() {
        return RecipeSerializer.FIREWORK_STAR;
    }
}