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

import java.util.function.ToDoubleFunction;
import net.minecraft.core.BlockPos;
import net.minecraft.world.entity.PathfinderMob;
import net.minecraft.world.phys.Vec3;
import org.jetbrains.annotations.Nullable;

public class LandRandomPos {
	@Nullable
	public static Vec3 getPos(PathfinderMob mob, int radius, int verticalRange) {
		return getPos(mob, radius, verticalRange, mob::getWalkTargetValue);
	}

	@Nullable
	public static Vec3 getPos(PathfinderMob mob, int radius, int yRange, ToDoubleFunction<BlockPos> toDoubleFunction) {
		boolean bl = GoalUtils.mobRestricted(mob, radius);
		return RandomPos.generateRandomPos(() -> {
			BlockPos blockPos = RandomPos.generateRandomDirection(mob.getRandom(), radius, yRange);
			BlockPos blockPos2 = generateRandomPosTowardDirection(mob, radius, bl, blockPos);
			return blockPos2 == null ? null : movePosUpOutOfSolid(mob, blockPos2);
		}, toDoubleFunction);
	}

	@Nullable
	public static Vec3 getPosTowards(PathfinderMob mob, int radius, int yRange, Vec3 vectorPosition) {
		Vec3 vec3 = vectorPosition.subtract(mob.getX(), mob.getY(), mob.getZ());
		boolean bl = GoalUtils.mobRestricted(mob, radius);
		return getPosInDirection(mob, radius, yRange, vec3, bl);
	}

	@Nullable
	public static Vec3 getPosAway(PathfinderMob mob, int radius, int yRange, Vec3 vectorPosition) {
		Vec3 vec3 = mob.position().subtract(vectorPosition);
		boolean bl = GoalUtils.mobRestricted(mob, radius);
		return getPosInDirection(mob, radius, yRange, vec3, bl);
	}

	@Nullable
	private static Vec3 getPosInDirection(PathfinderMob mob, int radius, int yRange, Vec3 vectorPosition, boolean shortCircuit) {
		return RandomPos.generateRandomPos(
			mob,
			() -> {
				BlockPos blockPos = RandomPos.generateRandomDirectionWithinRadians(
					mob.getRandom(), radius, yRange, 0, vectorPosition.x, vectorPosition.z, (float) (Math.PI / 2)
				);
				if (blockPos == null) {
					return null;
				} else {
					BlockPos blockPos2 = generateRandomPosTowardDirection(mob, radius, shortCircuit, blockPos);
					return blockPos2 == null ? null : movePosUpOutOfSolid(mob, blockPos2);
				}
			}
		);
	}

	@Nullable
	public static BlockPos movePosUpOutOfSolid(PathfinderMob mob, BlockPos pos) {
		pos = RandomPos.moveUpOutOfSolid(pos, mob.level().getMaxBuildHeight(), blockPos -> GoalUtils.isSolid(mob, blockPos));
		return !GoalUtils.isWater(mob, pos) && !GoalUtils.hasMalus(mob, pos) ? pos : null;
	}

	@Nullable
	public static BlockPos generateRandomPosTowardDirection(PathfinderMob mob, int radius, boolean shortCircuit, BlockPos pos) {
		BlockPos blockPos = RandomPos.generateRandomPosTowardDirection(mob, radius, mob.getRandom(), pos);
		return !GoalUtils.isOutsideLimits(blockPos, mob)
				&& !GoalUtils.isRestricted(shortCircuit, mob, blockPos)
				&& !GoalUtils.isNotStable(mob.getNavigation(), blockPos)
			? blockPos
			: null;
	}
}