<?php

/*
 *
 *  ____            _        _   __  __ _                  __  __ ____
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 *
 *
 */

declare(strict_types=1);

namespace pocketmine\block\utils;

use pocketmine\data\bedrock\block\BlockLegacyMetadata;
use pocketmine\math\Facing;

final class RailConnectionInfo{

	public const FLAG_ASCEND = 1 << 24; //used to indicate direction-up

	public const CONNECTIONS = [
		//straights
		BlockLegacyMetadata::RAIL_STRAIGHT_NORTH_SOUTH => [
			Facing::NORTH,
			Facing::SOUTH
		],
		BlockLegacyMetadata::RAIL_STRAIGHT_EAST_WEST => [
			Facing::EAST,
			Facing::WEST
		],

		//ascending
		BlockLegacyMetadata::RAIL_ASCENDING_EAST => [
			Facing::WEST,
			Facing::EAST | self::FLAG_ASCEND
		],
		BlockLegacyMetadata::RAIL_ASCENDING_WEST => [
			Facing::EAST,
			Facing::WEST | self::FLAG_ASCEND
		],
		BlockLegacyMetadata::RAIL_ASCENDING_NORTH => [
			Facing::SOUTH,
			Facing::NORTH | self::FLAG_ASCEND
		],
		BlockLegacyMetadata::RAIL_ASCENDING_SOUTH => [
			Facing::NORTH,
			Facing::SOUTH | self::FLAG_ASCEND
		]
	];

	/* extended meta values for regular rails, to allow curving */
	public const CURVE_CONNECTIONS = [
		BlockLegacyMetadata::RAIL_CURVE_SOUTHEAST => [
			Facing::SOUTH,
			Facing::EAST
		],
		BlockLegacyMetadata::RAIL_CURVE_SOUTHWEST => [
			Facing::SOUTH,
			Facing::WEST
		],
		BlockLegacyMetadata::RAIL_CURVE_NORTHWEST => [
			Facing::NORTH,
			Facing::WEST
		],
		BlockLegacyMetadata::RAIL_CURVE_NORTHEAST => [
			Facing::NORTH,
			Facing::EAST
		]
	];
}