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

import it.unimi.dsi.fastutil.ints.IntOpenHashSet;
import it.unimi.dsi.fastutil.ints.IntSet;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.Mob;

public class Sensing {
	private final Mob mob;
	private final IntSet seen = new IntOpenHashSet();
	private final IntSet unseen = new IntOpenHashSet();

	public Sensing(Mob mob) {
		this.mob = mob;
	}

	/**
	 * Clears seen and unseen.
	 */
	public void tick() {
		this.seen.clear();
		this.unseen.clear();
	}

	/**
	 * Updates list of visible and not visible entities for the given entity
	 */
	public boolean hasLineOfSight(Entity entity) {
		int i = entity.getId();
		if (this.seen.contains(i)) {
			return true;
		} else if (this.unseen.contains(i)) {
			return false;
		} else {
			this.mob.level().getProfiler().push("hasLineOfSight");
			boolean bl = this.mob.hasLineOfSight(entity);
			this.mob.level().getProfiler().pop();
			if (bl) {
				this.seen.add(i);
			} else {
				this.unseen.add(i);
			}

			return bl;
		}
	}
}