minecraft-src/net/minecraft/world/item/PotionItem.java

package net.minecraft.world.item;

import java.util.List;
import net.minecraft.advancements.CriteriaTriggers;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.core.component.DataComponents;
import net.minecraft.core.particles.ParticleTypes;
import net.minecraft.network.chat.Component;
import net.minecraft.server.level.ServerLevel;
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.BlockTags;
import net.minecraft.world.InteractionHand;
import net.minecraft.world.InteractionResult;
import net.minecraft.world.InteractionResultHolder;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.item.alchemy.Potion;
import net.minecraft.world.item.alchemy.PotionContents;
import net.minecraft.world.item.alchemy.Potions;
import net.minecraft.world.item.context.UseOnContext;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.gameevent.GameEvent;

public class PotionItem extends Item {
	private static final int DRINK_DURATION = 32;

	public PotionItem(Item.Properties properties) {
		super(properties);
	}

	@Override
	public ItemStack getDefaultInstance() {
		ItemStack itemStack = super.getDefaultInstance();
		itemStack.set(DataComponents.POTION_CONTENTS, new PotionContents(Potions.WATER));
		return itemStack;
	}

	@Override
	public ItemStack finishUsingItem(ItemStack stack, Level level, LivingEntity livingEntity) {
		Player player = livingEntity instanceof Player ? (Player)livingEntity : null;
		if (player instanceof ServerPlayer) {
			CriteriaTriggers.CONSUME_ITEM.trigger((ServerPlayer)player, stack);
		}

		if (!level.isClientSide) {
			PotionContents potionContents = stack.getOrDefault(DataComponents.POTION_CONTENTS, PotionContents.EMPTY);
			potionContents.forEachEffect(mobEffectInstance -> {
				if (mobEffectInstance.getEffect().value().isInstantenous()) {
					mobEffectInstance.getEffect().value().applyInstantenousEffect(player, player, livingEntity, mobEffectInstance.getAmplifier(), 1.0);
				} else {
					livingEntity.addEffect(mobEffectInstance);
				}
			});
		}

		if (player != null) {
			player.awardStat(Stats.ITEM_USED.get(this));
			stack.consume(1, player);
		}

		if (player == null || !player.hasInfiniteMaterials()) {
			if (stack.isEmpty()) {
				return new ItemStack(Items.GLASS_BOTTLE);
			}

			if (player != null) {
				player.getInventory().add(new ItemStack(Items.GLASS_BOTTLE));
			}
		}

		livingEntity.gameEvent(GameEvent.DRINK);
		return stack;
	}

	@Override
	public InteractionResult useOn(UseOnContext context) {
		Level level = context.getLevel();
		BlockPos blockPos = context.getClickedPos();
		Player player = context.getPlayer();
		ItemStack itemStack = context.getItemInHand();
		PotionContents potionContents = itemStack.getOrDefault(DataComponents.POTION_CONTENTS, PotionContents.EMPTY);
		BlockState blockState = level.getBlockState(blockPos);
		if (context.getClickedFace() != Direction.DOWN && blockState.is(BlockTags.CONVERTABLE_TO_MUD) && potionContents.is(Potions.WATER)) {
			level.playSound(null, blockPos, SoundEvents.GENERIC_SPLASH, SoundSource.BLOCKS, 1.0F, 1.0F);
			player.setItemInHand(context.getHand(), ItemUtils.createFilledResult(itemStack, player, new ItemStack(Items.GLASS_BOTTLE)));
			player.awardStat(Stats.ITEM_USED.get(itemStack.getItem()));
			if (!level.isClientSide) {
				ServerLevel serverLevel = (ServerLevel)level;

				for (int i = 0; i < 5; i++) {
					serverLevel.sendParticles(
						ParticleTypes.SPLASH,
						blockPos.getX() + level.random.nextDouble(),
						blockPos.getY() + 1,
						blockPos.getZ() + level.random.nextDouble(),
						1,
						0.0,
						0.0,
						0.0,
						1.0
					);
				}
			}

			level.playSound(null, blockPos, SoundEvents.BOTTLE_EMPTY, SoundSource.BLOCKS, 1.0F, 1.0F);
			level.gameEvent(null, GameEvent.FLUID_PLACE, blockPos);
			level.setBlockAndUpdate(blockPos, Blocks.MUD.defaultBlockState());
			return InteractionResult.sidedSuccess(level.isClientSide);
		} else {
			return InteractionResult.PASS;
		}
	}

	@Override
	public int getUseDuration(ItemStack stack, LivingEntity entity) {
		return 32;
	}

	@Override
	public UseAnim getUseAnimation(ItemStack stack) {
		return UseAnim.DRINK;
	}

	@Override
	public InteractionResultHolder<ItemStack> use(Level level, Player player, InteractionHand usedHand) {
		return ItemUtils.startUsingInstantly(level, player, usedHand);
	}

	@Override
	public String getDescriptionId(ItemStack stack) {
		return Potion.getName(stack.getOrDefault(DataComponents.POTION_CONTENTS, PotionContents.EMPTY).potion(), this.getDescriptionId() + ".effect.");
	}

	@Override
	public void appendHoverText(ItemStack stack, Item.TooltipContext context, List<Component> tooltipComponents, TooltipFlag tooltipFlag) {
		PotionContents potionContents = stack.get(DataComponents.POTION_CONTENTS);
		if (potionContents != null) {
			potionContents.addPotionTooltip(tooltipComponents::add, 1.0F, context.tickRate());
		}
	}
}