minecraft-src/net/minecraft/world/entity/projectile/ThrownPotion.java

package net.minecraft.world.entity.projectile;

import it.unimi.dsi.fastutil.doubles.DoubleDoubleImmutablePair;
import java.util.List;
import java.util.function.Predicate;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.core.Holder;
import net.minecraft.core.component.DataComponents;
import net.minecraft.tags.BlockTags;
import net.minecraft.world.damagesource.DamageSource;
import net.minecraft.world.effect.MobEffect;
import net.minecraft.world.effect.MobEffectInstance;
import net.minecraft.world.entity.AreaEffectCloud;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.animal.axolotl.Axolotl;
import net.minecraft.world.item.Item;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.item.Items;
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.level.Level;
import net.minecraft.world.level.block.AbstractCandleBlock;
import net.minecraft.world.level.block.CampfireBlock;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.phys.AABB;
import net.minecraft.world.phys.BlockHitResult;
import net.minecraft.world.phys.EntityHitResult;
import net.minecraft.world.phys.HitResult;
import org.jetbrains.annotations.Nullable;

public class ThrownPotion extends ThrowableItemProjectile implements ItemSupplier {
	public static final double SPLASH_RANGE = 4.0;
	private static final double SPLASH_RANGE_SQ = 16.0;
	public static final Predicate<LivingEntity> WATER_SENSITIVE_OR_ON_FIRE = livingEntity -> livingEntity.isSensitiveToWater() || livingEntity.isOnFire();

	public ThrownPotion(EntityType<? extends ThrownPotion> entityType, Level level) {
		super(entityType, level);
	}

	public ThrownPotion(Level level, LivingEntity shooter) {
		super(EntityType.POTION, shooter, level);
	}

	public ThrownPotion(Level level, double x, double y, double z) {
		super(EntityType.POTION, x, y, z, level);
	}

	@Override
	protected Item getDefaultItem() {
		return Items.SPLASH_POTION;
	}

	@Override
	protected double getDefaultGravity() {
		return 0.05;
	}

	@Override
	protected void onHitBlock(BlockHitResult result) {
		super.onHitBlock(result);
		if (!this.level().isClientSide) {
			ItemStack itemStack = this.getItem();
			Direction direction = result.getDirection();
			BlockPos blockPos = result.getBlockPos();
			BlockPos blockPos2 = blockPos.relative(direction);
			PotionContents potionContents = itemStack.getOrDefault(DataComponents.POTION_CONTENTS, PotionContents.EMPTY);
			if (potionContents.is(Potions.WATER)) {
				this.dowseFire(blockPos2);
				this.dowseFire(blockPos2.relative(direction.getOpposite()));

				for (Direction direction2 : Direction.Plane.HORIZONTAL) {
					this.dowseFire(blockPos2.relative(direction2));
				}
			}
		}
	}

	@Override
	protected void onHit(HitResult result) {
		super.onHit(result);
		if (!this.level().isClientSide) {
			ItemStack itemStack = this.getItem();
			PotionContents potionContents = itemStack.getOrDefault(DataComponents.POTION_CONTENTS, PotionContents.EMPTY);
			if (potionContents.is(Potions.WATER)) {
				this.applyWater();
			} else if (potionContents.hasEffects()) {
				if (this.isLingering()) {
					this.makeAreaOfEffectCloud(potionContents);
				} else {
					this.applySplash(potionContents.getAllEffects(), result.getType() == HitResult.Type.ENTITY ? ((EntityHitResult)result).getEntity() : null);
				}
			}

			int i = potionContents.potion().isPresent() && ((Potion)((Holder)potionContents.potion().get()).value()).hasInstantEffects() ? 2007 : 2002;
			this.level().levelEvent(i, this.blockPosition(), potionContents.getColor());
			this.discard();
		}
	}

	private void applyWater() {
		AABB aABB = this.getBoundingBox().inflate(4.0, 2.0, 4.0);

		for (LivingEntity livingEntity : this.level().getEntitiesOfClass(LivingEntity.class, aABB, WATER_SENSITIVE_OR_ON_FIRE)) {
			double d = this.distanceToSqr(livingEntity);
			if (d < 16.0) {
				if (livingEntity.isSensitiveToWater()) {
					livingEntity.hurt(this.damageSources().indirectMagic(this, this.getOwner()), 1.0F);
				}

				if (livingEntity.isOnFire() && livingEntity.isAlive()) {
					livingEntity.extinguishFire();
				}
			}
		}

		for (Axolotl axolotl : this.level().getEntitiesOfClass(Axolotl.class, aABB)) {
			axolotl.rehydrate();
		}
	}

	private void applySplash(Iterable<MobEffectInstance> effects, @Nullable Entity entity) {
		AABB aABB = this.getBoundingBox().inflate(4.0, 2.0, 4.0);
		List<LivingEntity> list = this.level().getEntitiesOfClass(LivingEntity.class, aABB);
		if (!list.isEmpty()) {
			Entity entity2 = this.getEffectSource();

			for (LivingEntity livingEntity : list) {
				if (livingEntity.isAffectedByPotions()) {
					double d = this.distanceToSqr(livingEntity);
					if (d < 16.0) {
						double e;
						if (livingEntity == entity) {
							e = 1.0;
						} else {
							e = 1.0 - Math.sqrt(d) / 4.0;
						}

						for (MobEffectInstance mobEffectInstance : effects) {
							Holder<MobEffect> holder = mobEffectInstance.getEffect();
							if (holder.value().isInstantenous()) {
								holder.value().applyInstantenousEffect(this, this.getOwner(), livingEntity, mobEffectInstance.getAmplifier(), e);
							} else {
								int i = mobEffectInstance.mapDuration(ix -> (int)(e * ix + 0.5));
								MobEffectInstance mobEffectInstance2 = new MobEffectInstance(
									holder, i, mobEffectInstance.getAmplifier(), mobEffectInstance.isAmbient(), mobEffectInstance.isVisible()
								);
								if (!mobEffectInstance2.endsWithin(20)) {
									livingEntity.addEffect(mobEffectInstance2, entity2);
								}
							}
						}
					}
				}
			}
		}
	}

	private void makeAreaOfEffectCloud(PotionContents potionContents) {
		AreaEffectCloud areaEffectCloud = new AreaEffectCloud(this.level(), this.getX(), this.getY(), this.getZ());
		if (this.getOwner() instanceof LivingEntity livingEntity) {
			areaEffectCloud.setOwner(livingEntity);
		}

		areaEffectCloud.setRadius(3.0F);
		areaEffectCloud.setRadiusOnUse(-0.5F);
		areaEffectCloud.setWaitTime(10);
		areaEffectCloud.setRadiusPerTick(-areaEffectCloud.getRadius() / areaEffectCloud.getDuration());
		areaEffectCloud.setPotionContents(potionContents);
		this.level().addFreshEntity(areaEffectCloud);
	}

	private boolean isLingering() {
		return this.getItem().is(Items.LINGERING_POTION);
	}

	private void dowseFire(BlockPos pos) {
		BlockState blockState = this.level().getBlockState(pos);
		if (blockState.is(BlockTags.FIRE)) {
			this.level().destroyBlock(pos, false, this);
		} else if (AbstractCandleBlock.isLit(blockState)) {
			AbstractCandleBlock.extinguish(null, blockState, this.level(), pos);
		} else if (CampfireBlock.isLitCampfire(blockState)) {
			this.level().levelEvent(null, 1009, pos, 0);
			CampfireBlock.dowse(this.getOwner(), this.level(), pos, blockState);
			this.level().setBlockAndUpdate(pos, blockState.setValue(CampfireBlock.LIT, false));
		}
	}

	@Override
	public DoubleDoubleImmutablePair calculateHorizontalHurtKnockbackDirection(LivingEntity entity, DamageSource damageSource) {
		double d = entity.position().x - this.position().x;
		double e = entity.position().z - this.position().z;
		return DoubleDoubleImmutablePair.of(d, e);
	}
}