minecraft-src/net/minecraft/world/entity/ai/goal/MoveThroughVillageGoal.java

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

import com.google.common.collect.Lists;
import java.util.EnumSet;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.function.BooleanSupplier;
import net.minecraft.core.BlockPos;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.tags.PoiTypeTags;
import net.minecraft.world.entity.PathfinderMob;
import net.minecraft.world.entity.ai.goal.Goal.Flag;
import net.minecraft.world.entity.ai.navigation.GroundPathNavigation;
import net.minecraft.world.entity.ai.util.DefaultRandomPos;
import net.minecraft.world.entity.ai.util.GoalUtils;
import net.minecraft.world.entity.ai.util.LandRandomPos;
import net.minecraft.world.entity.ai.village.poi.PoiManager.Occupancy;
import net.minecraft.world.level.block.DoorBlock;
import net.minecraft.world.level.pathfinder.Node;
import net.minecraft.world.level.pathfinder.Path;
import net.minecraft.world.phys.Vec3;
import org.jetbrains.annotations.Nullable;

public class MoveThroughVillageGoal extends Goal {
	protected final PathfinderMob mob;
	private final double speedModifier;
	@Nullable
	private Path path;
	private BlockPos poiPos;
	private final boolean onlyAtNight;
	private final List<BlockPos> visited = Lists.<BlockPos>newArrayList();
	private final int distanceToPoi;
	private final BooleanSupplier canDealWithDoors;

	public MoveThroughVillageGoal(PathfinderMob mob, double speedModifier, boolean onlyAtNight, int distanceToPoi, BooleanSupplier canDealWithDoors) {
		this.mob = mob;
		this.speedModifier = speedModifier;
		this.onlyAtNight = onlyAtNight;
		this.distanceToPoi = distanceToPoi;
		this.canDealWithDoors = canDealWithDoors;
		this.setFlags(EnumSet.of(Flag.MOVE));
		if (!GoalUtils.hasGroundPathNavigation(mob)) {
			throw new IllegalArgumentException("Unsupported mob for MoveThroughVillageGoal");
		}
	}

	@Override
	public boolean canUse() {
		if (!GoalUtils.hasGroundPathNavigation(this.mob)) {
			return false;
		} else {
			this.updateVisited();
			if (this.onlyAtNight && this.mob.level().isBrightOutside()) {
				return false;
			} else {
				ServerLevel serverLevel = (ServerLevel)this.mob.level();
				BlockPos blockPos = this.mob.blockPosition();
				if (!serverLevel.isCloseToVillage(blockPos, 6)) {
					return false;
				} else {
					Vec3 vec3 = LandRandomPos.getPos(
						this.mob,
						15,
						7,
						blockPos2x -> {
							if (!serverLevel.isVillage(blockPos2x)) {
								return Double.NEGATIVE_INFINITY;
							} else {
								Optional<BlockPos> optionalx = serverLevel.getPoiManager()
									.find(holder -> holder.is(PoiTypeTags.VILLAGE), this::hasNotVisited, blockPos2x, 10, Occupancy.IS_OCCUPIED);
								return (Double)optionalx.map(blockPos2xx -> -blockPos2xx.distSqr(blockPos)).orElse(Double.NEGATIVE_INFINITY);
							}
						}
					);
					if (vec3 == null) {
						return false;
					} else {
						Optional<BlockPos> optional = serverLevel.getPoiManager()
							.find(holder -> holder.is(PoiTypeTags.VILLAGE), this::hasNotVisited, BlockPos.containing(vec3), 10, Occupancy.IS_OCCUPIED);
						if (optional.isEmpty()) {
							return false;
						} else {
							this.poiPos = ((BlockPos)optional.get()).immutable();
							GroundPathNavigation groundPathNavigation = (GroundPathNavigation)this.mob.getNavigation();
							groundPathNavigation.setCanOpenDoors(this.canDealWithDoors.getAsBoolean());
							this.path = groundPathNavigation.createPath(this.poiPos, 0);
							groundPathNavigation.setCanOpenDoors(true);
							if (this.path == null) {
								Vec3 vec32 = DefaultRandomPos.getPosTowards(this.mob, 10, 7, Vec3.atBottomCenterOf(this.poiPos), (float) (Math.PI / 2));
								if (vec32 == null) {
									return false;
								}

								groundPathNavigation.setCanOpenDoors(this.canDealWithDoors.getAsBoolean());
								this.path = this.mob.getNavigation().createPath(vec32.x, vec32.y, vec32.z, 0);
								groundPathNavigation.setCanOpenDoors(true);
								if (this.path == null) {
									return false;
								}
							}

							for (int i = 0; i < this.path.getNodeCount(); i++) {
								Node node = this.path.getNode(i);
								BlockPos blockPos2 = new BlockPos(node.x, node.y + 1, node.z);
								if (DoorBlock.isWoodenDoor(this.mob.level(), blockPos2)) {
									this.path = this.mob.getNavigation().createPath(node.x, node.y, node.z, 0);
									break;
								}
							}

							return this.path != null;
						}
					}
				}
			}
		}
	}

	@Override
	public boolean canContinueToUse() {
		return this.mob.getNavigation().isDone() ? false : !this.poiPos.closerToCenterThan(this.mob.position(), this.mob.getBbWidth() + this.distanceToPoi);
	}

	@Override
	public void start() {
		this.mob.getNavigation().moveTo(this.path, this.speedModifier);
	}

	@Override
	public void stop() {
		if (this.mob.getNavigation().isDone() || this.poiPos.closerToCenterThan(this.mob.position(), this.distanceToPoi)) {
			this.visited.add(this.poiPos);
		}
	}

	private boolean hasNotVisited(BlockPos pos) {
		for (BlockPos blockPos : this.visited) {
			if (Objects.equals(pos, blockPos)) {
				return false;
			}
		}

		return true;
	}

	private void updateVisited() {
		if (this.visited.size() > 15) {
			this.visited.remove(0);
		}
	}
}