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

import com.google.common.collect.ImmutableSet;
import java.util.Comparator;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.entity.EntitySelector;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.ai.Brain;
import net.minecraft.world.entity.ai.attributes.Attributes;
import net.minecraft.world.entity.ai.memory.MemoryModuleType;
import net.minecraft.world.entity.player.Player;

public class PlayerSensor extends Sensor<LivingEntity> {
	@Override
	public Set<MemoryModuleType<?>> requires() {
		return ImmutableSet.of(
			MemoryModuleType.NEAREST_PLAYERS,
			MemoryModuleType.NEAREST_VISIBLE_PLAYER,
			MemoryModuleType.NEAREST_VISIBLE_ATTACKABLE_PLAYER,
			MemoryModuleType.NEAREST_VISIBLE_ATTACKABLE_PLAYERS
		);
	}

	@Override
	protected void doTick(ServerLevel level, LivingEntity entity) {
		List<Player> list = (List<Player>)level.players()
			.stream()
			.filter(EntitySelector.NO_SPECTATORS)
			.filter(serverPlayer -> entity.closerThan(serverPlayer, this.getFollowDistance(entity)))
			.sorted(Comparator.comparingDouble(entity::distanceToSqr))
			.collect(Collectors.toList());
		Brain<?> brain = entity.getBrain();
		brain.setMemory(MemoryModuleType.NEAREST_PLAYERS, list);
		List<Player> list2 = (List<Player>)list.stream().filter(player -> isEntityTargetable(level, entity, player)).collect(Collectors.toList());
		brain.setMemory(MemoryModuleType.NEAREST_VISIBLE_PLAYER, list2.isEmpty() ? null : (Player)list2.get(0));
		List<Player> list3 = list2.stream().filter(player -> isEntityAttackable(level, entity, player)).toList();
		brain.setMemory(MemoryModuleType.NEAREST_VISIBLE_ATTACKABLE_PLAYERS, list3);
		brain.setMemory(MemoryModuleType.NEAREST_VISIBLE_ATTACKABLE_PLAYER, list3.isEmpty() ? null : (Player)list3.get(0));
	}

	protected double getFollowDistance(LivingEntity entity) {
		return entity.getAttributeValue(Attributes.FOLLOW_RANGE);
	}
}