<?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\network\mcpe;

use pocketmine\network\mcpe\compression\CompressBatchPromise;
use pocketmine\network\mcpe\compression\Zlib;
use pocketmine\network\mcpe\protocol\LevelChunkPacket;
use pocketmine\network\mcpe\serializer\ChunkSerializer;
use pocketmine\scheduler\AsyncTask;
use pocketmine\world\format\Chunk;
use pocketmine\world\format\io\FastChunkSerializer;

class ChunkRequestTask extends AsyncTask{
	private const TLS_KEY_PROMISE = "promise";
	private const TLS_KEY_ERROR_HOOK = "errorHook";

	/** @var string */
	protected $chunk;
	/** @var int */
	protected $chunkX;
	/** @var int */
	protected $chunkZ;

	/** @var int */
	protected $compressionLevel;

	/** @var string */
	private $tiles = "";

	public function __construct(int $chunkX, int $chunkZ, Chunk $chunk, CompressBatchPromise $promise, ?\Closure $onError = null){
		$this->compressionLevel = Zlib::$LEVEL;

		$this->chunk = FastChunkSerializer::serialize($chunk);
		$this->chunkX = $chunkX;
		$this->chunkZ = $chunkZ;
		$this->tiles = ChunkSerializer::serializeTiles($chunk);

		$this->storeLocal(self::TLS_KEY_PROMISE, $promise);
		$this->storeLocal(self::TLS_KEY_ERROR_HOOK, $onError);
	}

	public function onRun() : void{
		$chunk = FastChunkSerializer::deserialize($this->chunk);
		$subCount = ChunkSerializer::getSubChunkCount($chunk);
		$payload = ChunkSerializer::serialize($chunk, $this->tiles);
		$this->setResult(Zlib::compress(PacketBatch::fromPackets(LevelChunkPacket::withoutCache($this->chunkX, $this->chunkZ, $subCount, $payload))->getBuffer(), $this->compressionLevel));
	}

	public function onError() : void{
		/** @var \Closure $hook */
		$hook = $this->fetchLocal(self::TLS_KEY_ERROR_HOOK);
		if($hook !== null){
			$hook();
		}
	}

	public function onCompletion() : void{
		/** @var CompressBatchPromise $promise */
		$promise = $this->fetchLocal(self::TLS_KEY_PROMISE);
		$promise->resolve($this->getResult());
	}
}