src/game/java/net/minecraft/world/item/BottleItem.java

package net.minecraft.world.item;

import java.util.List;
import net.minecraft.advancements.CriteriaTriggers;
import net.minecraft.core.BlockPos;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.sounds.SoundSource;
import net.minecraft.stats.Stats;
import net.minecraft.tags.FluidTags;
import net.minecraft.world.InteractionHand;
import net.minecraft.world.InteractionResult;
import net.minecraft.world.entity.AreaEffectCloud;
import net.minecraft.world.entity.boss.enderdragon.EnderDragon;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.item.alchemy.PotionContents;
import net.minecraft.world.item.alchemy.Potions;
import net.minecraft.world.level.ClipContext;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.gameevent.GameEvent;
import net.minecraft.world.phys.BlockHitResult;
import net.minecraft.world.phys.HitResult;

public class BottleItem extends Item {
    public BottleItem(Item.Properties p_40648_) {
        super(p_40648_);
    }

    @Override
    public InteractionResult use(Level p_40656_, Player p_40657_, InteractionHand p_40658_) {
        List<AreaEffectCloud> list = p_40656_.getEntitiesOfClass(
            AreaEffectCloud.class,
            p_40657_.getBoundingBox().inflate(2.0),
            p_359380_ -> p_359380_ != null && p_359380_.isAlive() && p_359380_.getOwner() instanceof EnderDragon
        );
        ItemStack itemstack = p_40657_.getItemInHand(p_40658_);
        if (!list.isEmpty()) {
            AreaEffectCloud areaeffectcloud = list.get(0);
            areaeffectcloud.setRadius(areaeffectcloud.getRadius() - 0.5F);
            p_40656_.playSound(null, p_40657_.getX(), p_40657_.getY(), p_40657_.getZ(), SoundEvents.BOTTLE_FILL_DRAGONBREATH, SoundSource.NEUTRAL, 1.0F, 1.0F);
            p_40656_.gameEvent(p_40657_, GameEvent.FLUID_PICKUP, p_40657_.position());
            if (p_40657_ instanceof ServerPlayer serverplayer) {
                CriteriaTriggers.PLAYER_INTERACTED_WITH_ENTITY.trigger(serverplayer, itemstack, areaeffectcloud);
            }

            return InteractionResult.SUCCESS.heldItemTransformedTo(this.turnBottleIntoItem(itemstack, p_40657_, new ItemStack(Items.DRAGON_BREATH)));
        } else {
            BlockHitResult blockhitresult = getPlayerPOVHitResult(p_40656_, p_40657_, ClipContext.Fluid.SOURCE_ONLY);
            if (blockhitresult.getType() == HitResult.Type.MISS) {
                return InteractionResult.PASS;
            } else {
                if (blockhitresult.getType() == HitResult.Type.BLOCK) {
                    BlockPos blockpos = blockhitresult.getBlockPos();
                    if (!p_40656_.mayInteract(p_40657_, blockpos)) {
                        return InteractionResult.PASS;
                    }

                    if (p_40656_.getFluidState(blockpos).is(FluidTags.WATER)) {
                        p_40656_.playSound(
                            p_40657_, p_40657_.getX(), p_40657_.getY(), p_40657_.getZ(), SoundEvents.BOTTLE_FILL, SoundSource.NEUTRAL, 1.0F, 1.0F
                        );
                        p_40656_.gameEvent(p_40657_, GameEvent.FLUID_PICKUP, blockpos);
                        return InteractionResult.SUCCESS
                            .heldItemTransformedTo(this.turnBottleIntoItem(itemstack, p_40657_, PotionContents.createItemStack(Items.POTION, Potions.WATER)));
                    }
                }

                return InteractionResult.PASS;
            }
        }
    }

    protected ItemStack turnBottleIntoItem(ItemStack p_40652_, Player p_40653_, ItemStack p_40654_) {
        p_40653_.awardStat(Stats.ITEM_USED.get(this));
        return ItemUtils.createFilledResult(p_40652_, p_40653_, p_40654_);
    }
}