package net.minecraft.world.entity.ai.sensing;

import com.google.common.collect.ImmutableSet;
import java.util.Set;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.damagesource.DamageSource;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.ai.Brain;
import net.minecraft.world.entity.ai.memory.MemoryModuleType;

public class HurtBySensor extends Sensor<LivingEntity> {
	@Override
	public Set<MemoryModuleType<?>> requires() {
		return ImmutableSet.of(MemoryModuleType.HURT_BY, MemoryModuleType.HURT_BY_ENTITY);
	}

	@Override
	protected void doTick(ServerLevel level, LivingEntity entity) {
		Brain<?> brain = entity.getBrain();
		DamageSource damageSource = entity.getLastDamageSource();
		if (damageSource != null) {
			brain.setMemory(MemoryModuleType.HURT_BY, entity.getLastDamageSource());
			Entity entity2 = damageSource.getEntity();
			if (entity2 instanceof LivingEntity) {
				brain.setMemory(MemoryModuleType.HURT_BY_ENTITY, (LivingEntity)entity2);
			}
		} else {
			brain.eraseMemory(MemoryModuleType.HURT_BY);
		}

		brain.getMemory(MemoryModuleType.HURT_BY_ENTITY).ifPresent(livingEntity -> {
			if (!livingEntity.isAlive() || livingEntity.level() != level) {
				brain.eraseMemory(MemoryModuleType.HURT_BY_ENTITY);
			}
		});
	}
}