<?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\world\format\io\region;

use pocketmine\block\BlockLegacyIds;
use pocketmine\nbt\BigEndianNbtSerializer;
use pocketmine\nbt\NbtDataException;
use pocketmine\nbt\tag\ByteArrayTag;
use pocketmine\nbt\tag\IntArrayTag;
use pocketmine\nbt\tag\ListTag;
use pocketmine\world\format\Chunk;
use pocketmine\world\format\io\ChunkUtils;
use pocketmine\world\format\io\exception\CorruptedChunkException;
use pocketmine\world\format\io\SubChunkConverter;
use pocketmine\world\format\SubChunk;
use function str_repeat;

class McRegion extends RegionWorldProvider{

	/**
	 * @param Chunk $chunk
	 *
	 * @return string
	 * @throws \RuntimeException
	 */
	protected function serializeChunk(Chunk $chunk) : string{
		throw new \RuntimeException("Unsupported");
	}

	/**
	 * @param string $data
	 *
	 * @return Chunk
	 * @throws CorruptedChunkException
	 */
	protected function deserializeChunk(string $data) : Chunk{
		$nbt = new BigEndianNbtSerializer();
		try{
			$chunk = $nbt->readCompressed($data)->mustGetCompoundTag();
		}catch(NbtDataException $e){
			throw new CorruptedChunkException($e->getMessage(), 0, $e);
		}
		if(!$chunk->hasTag("Level")){
			throw new CorruptedChunkException("'Level' key is missing from chunk NBT");
		}

		$chunk = $chunk->getCompoundTag("Level");

		$subChunks = [];
		$fullIds = $chunk->hasTag("Blocks", ByteArrayTag::class) ? $chunk->getByteArray("Blocks") : str_repeat("\x00", 32768);
		$fullData = $chunk->hasTag("Data", ByteArrayTag::class) ? $chunk->getByteArray("Data") : str_repeat("\x00", 16384);

		for($y = 0; $y < 8; ++$y){
			$subChunks[$y] = new SubChunk(BlockLegacyIds::AIR << 4, [SubChunkConverter::convertSubChunkFromLegacyColumn($fullIds, $fullData, $y)]);
		}

		if($chunk->hasTag("BiomeColors", IntArrayTag::class)){
			$biomeIds = ChunkUtils::convertBiomeColors($chunk->getIntArray("BiomeColors")); //Convert back to original format
		}elseif($chunk->hasTag("Biomes", ByteArrayTag::class)){
			$biomeIds = $chunk->getByteArray("Biomes");
		}else{
			$biomeIds = "";
		}

		$result = new Chunk(
			$chunk->getInt("xPos"),
			$chunk->getInt("zPos"),
			$subChunks,
			$chunk->hasTag("Entities", ListTag::class) ? self::getCompoundList("Entities", $chunk->getListTag("Entities")) : [],
			$chunk->hasTag("TileEntities", ListTag::class) ? self::getCompoundList("TileEntities", $chunk->getListTag("TileEntities")) : [],
			$biomeIds
		);
		$result->setPopulated($chunk->getByte("TerrainPopulated", 0) !== 0);
		$result->setGenerated(true);
		return $result;
	}

	protected static function getRegionFileExtension() : string{
		return "mcr";
	}

	protected static function getPcWorldFormatVersion() : int{
		return 19132;
	}

	public function getWorldHeight() : int{
		//TODO: add world height options
		return 128;
	}
}