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

import java.util.List;
import java.util.stream.Collectors;
import net.minecraft.core.BlockPos;
import net.minecraft.core.SectionPos;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.PathfinderMob;
import net.minecraft.world.entity.ai.util.LandRandomPos;
import net.minecraft.world.entity.ai.village.poi.PoiManager;
import net.minecraft.world.entity.ai.village.poi.PoiRecord;
import net.minecraft.world.entity.npc.Villager;
import net.minecraft.world.phys.Vec3;
import org.jetbrains.annotations.Nullable;

public class GolemRandomStrollInVillageGoal extends RandomStrollGoal {
	private static final int POI_SECTION_SCAN_RADIUS = 2;
	private static final int VILLAGER_SCAN_RADIUS = 32;
	private static final int RANDOM_POS_XY_DISTANCE = 10;
	private static final int RANDOM_POS_Y_DISTANCE = 7;

	public GolemRandomStrollInVillageGoal(PathfinderMob pathfinderMob, double d) {
		super(pathfinderMob, d, 240, false);
	}

	@Nullable
	@Override
	protected Vec3 getPosition() {
		float f = this.mob.level().random.nextFloat();
		if (this.mob.level().random.nextFloat() < 0.3F) {
			return this.getPositionTowardsAnywhere();
		} else {
			Vec3 vec3;
			if (f < 0.7F) {
				vec3 = this.getPositionTowardsVillagerWhoWantsGolem();
				if (vec3 == null) {
					vec3 = this.getPositionTowardsPoi();
				}
			} else {
				vec3 = this.getPositionTowardsPoi();
				if (vec3 == null) {
					vec3 = this.getPositionTowardsVillagerWhoWantsGolem();
				}
			}

			return vec3 == null ? this.getPositionTowardsAnywhere() : vec3;
		}
	}

	@Nullable
	private Vec3 getPositionTowardsAnywhere() {
		return LandRandomPos.getPos(this.mob, 10, 7);
	}

	@Nullable
	private Vec3 getPositionTowardsVillagerWhoWantsGolem() {
		ServerLevel serverLevel = (ServerLevel)this.mob.level();
		List<Villager> list = serverLevel.getEntities(EntityType.VILLAGER, this.mob.getBoundingBox().inflate(32.0), this::doesVillagerWantGolem);
		if (list.isEmpty()) {
			return null;
		} else {
			Villager villager = (Villager)list.get(this.mob.level().random.nextInt(list.size()));
			Vec3 vec3 = villager.position();
			return LandRandomPos.getPosTowards(this.mob, 10, 7, vec3);
		}
	}

	@Nullable
	private Vec3 getPositionTowardsPoi() {
		SectionPos sectionPos = this.getRandomVillageSection();
		if (sectionPos == null) {
			return null;
		} else {
			BlockPos blockPos = this.getRandomPoiWithinSection(sectionPos);
			return blockPos == null ? null : LandRandomPos.getPosTowards(this.mob, 10, 7, Vec3.atBottomCenterOf(blockPos));
		}
	}

	@Nullable
	private SectionPos getRandomVillageSection() {
		ServerLevel serverLevel = (ServerLevel)this.mob.level();
		List<SectionPos> list = (List<SectionPos>)SectionPos.cube(SectionPos.of(this.mob), 2)
			.filter(sectionPos -> serverLevel.sectionsToVillage(sectionPos) == 0)
			.collect(Collectors.toList());
		return list.isEmpty() ? null : (SectionPos)list.get(serverLevel.random.nextInt(list.size()));
	}

	@Nullable
	private BlockPos getRandomPoiWithinSection(SectionPos sectionPos) {
		ServerLevel serverLevel = (ServerLevel)this.mob.level();
		PoiManager poiManager = serverLevel.getPoiManager();
		List<BlockPos> list = (List<BlockPos>)poiManager.getInRange(holder -> true, sectionPos.center(), 8, PoiManager.Occupancy.IS_OCCUPIED)
			.map(PoiRecord::getPos)
			.collect(Collectors.toList());
		return list.isEmpty() ? null : (BlockPos)list.get(serverLevel.random.nextInt(list.size()));
	}

	private boolean doesVillagerWantGolem(Villager villager) {
		return villager.wantsToSpawnGolem(this.mob.level().getGameTime());
	}
}