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

import com.google.common.collect.ImmutableSet;
import com.mojang.datafixers.util.Pair;
import it.unimi.dsi.fastutil.longs.Long2LongMap;
import it.unimi.dsi.fastutil.longs.Long2LongOpenHashMap;
import java.util.Optional;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Holder;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.entity.Mob;
import net.minecraft.world.entity.ai.behavior.AcquirePoi;
import net.minecraft.world.entity.ai.memory.MemoryModuleType;
import net.minecraft.world.entity.ai.village.poi.PoiManager;
import net.minecraft.world.entity.ai.village.poi.PoiType;
import net.minecraft.world.entity.ai.village.poi.PoiTypes;
import net.minecraft.world.level.pathfinder.Path;

public class NearestBedSensor extends Sensor<Mob> {
	private static final int CACHE_TIMEOUT = 40;
	private static final int BATCH_SIZE = 5;
	private static final int RATE = 20;
	private final Long2LongMap batchCache = new Long2LongOpenHashMap();
	private int triedCount;
	private long lastUpdate;

	public NearestBedSensor() {
		super(20);
	}

	@Override
	public Set<MemoryModuleType<?>> requires() {
		return ImmutableSet.of(MemoryModuleType.NEAREST_BED);
	}

	protected void doTick(ServerLevel level, Mob entity) {
		if (entity.isBaby()) {
			this.triedCount = 0;
			this.lastUpdate = level.getGameTime() + level.getRandom().nextInt(20);
			PoiManager poiManager = level.getPoiManager();
			Predicate<BlockPos> predicate = blockPosx -> {
				long l = blockPosx.asLong();
				if (this.batchCache.containsKey(l)) {
					return false;
				} else if (++this.triedCount >= 5) {
					return false;
				} else {
					this.batchCache.put(l, this.lastUpdate + 40L);
					return true;
				}
			};
			Set<Pair<Holder<PoiType>, BlockPos>> set = (Set<Pair<Holder<PoiType>, BlockPos>>)poiManager.findAllWithType(
					holder -> holder.is(PoiTypes.HOME), predicate, entity.blockPosition(), 48, PoiManager.Occupancy.ANY
				)
				.collect(Collectors.toSet());
			Path path = AcquirePoi.findPathToPois(entity, set);
			if (path != null && path.canReach()) {
				BlockPos blockPos = path.getTarget();
				Optional<Holder<PoiType>> optional = poiManager.getType(blockPos);
				if (optional.isPresent()) {
					entity.getBrain().setMemory(MemoryModuleType.NEAREST_BED, blockPos);
				}
			} else if (this.triedCount < 5) {
				this.batchCache.long2LongEntrySet().removeIf(entry -> entry.getLongValue() < this.lastUpdate);
			}
		}
	}
}