TypeConverter.php

<?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\convert;
 
use pmmp\encoding\ByteBufferReader;
use pmmp\encoding\ByteBufferWriter;
use pocketmine\block\tile\Container;
use pocketmine\block\VanillaBlocks;
use pocketmine\crafting\ExactRecipeIngredient;
use pocketmine\crafting\MetaWildcardRecipeIngredient;
use pocketmine\crafting\RecipeIngredient;
use pocketmine\crafting\TagWildcardRecipeIngredient;
use pocketmine\data\bedrock\BedrockDataFiles;
use pocketmine\data\bedrock\item\BlockItemIdMap;
use pocketmine\data\bedrock\item\ItemTypeNames;
use pocketmine\data\SavedDataLoadingException;
use pocketmine\item\Item;
use pocketmine\item\VanillaItems;
use pocketmine\nbt\LittleEndianNbtSerializer;
use pocketmine\nbt\NBT;
use pocketmine\nbt\NbtException;
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\nbt\tag\ListTag;
use pocketmine\nbt\tag\Tag;
use pocketmine\nbt\TreeRoot;
use pocketmine\nbt\UnexpectedTagTypeException;
use pocketmine\network\mcpe\protocol\serializer\ItemTypeDictionary;
use pocketmine\network\mcpe\protocol\types\GameMode as ProtocolGameMode;
use pocketmine\network\mcpe\protocol\types\inventory\ItemStack;
use pocketmine\network\mcpe\protocol\types\inventory\ItemStackExtraData;
use pocketmine\network\mcpe\protocol\types\inventory\ItemStackExtraDataShield;
use pocketmine\network\mcpe\protocol\types\recipe\IntIdMetaItemDescriptor;
use pocketmine\network\mcpe\protocol\types\recipe\RecipeIngredient as ProtocolRecipeIngredient;
use pocketmine\network\mcpe\protocol\types\recipe\StringIdMetaItemDescriptor;
use pocketmine\network\mcpe\protocol\types\recipe\TagItemDescriptor;
use pocketmine\player\GameMode;
use pocketmine\utils\AssumptionFailedError;
use pocketmine\utils\Filesystem;
use pocketmine\utils\SingletonTrait;
use pocketmine\world\format\io\GlobalBlockStateHandlers;
use pocketmine\world\format\io\GlobalItemDataHandlers;
use function get_class;
use function hash;
 
class TypeConverter{
    use SingletonTrait;
 
    private const PM_ID_TAG = "___Id___";
    private const PM_FULL_NBT_HASH_TAG = "___FullNbtHash___";
 
    private const RECIPE_INPUT_WILDCARD_META = 0x7fff;
 
    private BlockItemIdMap $blockItemIdMap;
    private BlockTranslator $blockTranslator;
    private ItemTranslator $itemTranslator;
    private ItemTypeDictionary $itemTypeDictionary;
    private int $shieldRuntimeId;
 
    private SkinAdapter $skinAdapter;
 
    public function __construct(){
        //TODO: inject stuff via constructor
        $this->blockItemIdMap = BlockItemIdMap::getInstance();
 
        $canonicalBlockStatesRaw = Filesystem::fileGetContents(BedrockDataFiles::CANONICAL_BLOCK_STATES_NBT);
        $metaMappingRaw = Filesystem::fileGetContents(BedrockDataFiles::BLOCK_STATE_META_MAP_JSON);
        $this->blockTranslator = new BlockTranslator(
            BlockStateDictionary::loadFromString($canonicalBlockStatesRaw, $metaMappingRaw),
            GlobalBlockStateHandlers::getSerializer()
        );
 
        $this->itemTypeDictionary = ItemTypeDictionaryFromDataHelper::loadFromString(Filesystem::fileGetContents(BedrockDataFiles::REQUIRED_ITEM_LIST_JSON));
        $this->shieldRuntimeId = $this->itemTypeDictionary->fromStringId(ItemTypeNames::SHIELD);
 
        $this->itemTranslator = new ItemTranslator(
            $this->itemTypeDictionary,
            $this->blockTranslator->getBlockStateDictionary(),
            GlobalItemDataHandlers::getSerializer(),
            GlobalItemDataHandlers::getDeserializer(),
            $this->blockItemIdMap
        );
 
        $this->skinAdapter = new LegacySkinAdapter();
    }
 
    public function getBlockTranslator() : BlockTranslator{ return $this->blockTranslator; }
 
    public function getItemTypeDictionary() : ItemTypeDictionary{ return $this->itemTypeDictionary; }
 
    public function getItemTranslator() : ItemTranslator{ return $this->itemTranslator; }
 
    public function getSkinAdapter() : SkinAdapter{ return $this->skinAdapter; }
 
    public function setSkinAdapter(SkinAdapter $skinAdapter) : void{
        $this->skinAdapter = $skinAdapter;
    }
 
    public function coreGameModeToProtocol(GameMode $gamemode) : int{
        return match($gamemode){
            GameMode::SURVIVAL => ProtocolGameMode::SURVIVAL,
            //TODO: native spectator support
            GameMode::CREATIVE, GameMode::SPECTATOR => ProtocolGameMode::CREATIVE,
            GameMode::ADVENTURE => ProtocolGameMode::ADVENTURE,
        };
    }
 
    public function protocolGameModeToCore(int $gameMode) : ?GameMode{
        return match($gameMode){
            ProtocolGameMode::SURVIVAL => GameMode::SURVIVAL,
            ProtocolGameMode::CREATIVE => GameMode::CREATIVE,
            ProtocolGameMode::ADVENTURE => GameMode::ADVENTURE,
            ProtocolGameMode::SURVIVAL_VIEWER, ProtocolGameMode::CREATIVE_VIEWER => GameMode::SPECTATOR,
            //TODO: native spectator support
            default => null,
        };
    }
 
    public function coreRecipeIngredientToNet(?RecipeIngredient $ingredient) : ProtocolRecipeIngredient{
        if($ingredient === null){
            return new ProtocolRecipeIngredient(null, 0);
        }
        if($ingredient instanceof MetaWildcardRecipeIngredient){
            $id = $this->itemTypeDictionary->fromStringId($ingredient->getItemId());
            $meta = self::RECIPE_INPUT_WILDCARD_META;
            $descriptor = new IntIdMetaItemDescriptor($id, $meta);
        }elseif($ingredient instanceof ExactRecipeIngredient){
            $item = $ingredient->getItem();
            [$id, $meta, $blockRuntimeId] = $this->itemTranslator->toNetworkId($item);
            if($blockRuntimeId !== null){
                $meta = $this->blockTranslator->getBlockStateDictionary()->getMetaFromStateId($blockRuntimeId);
                if($meta === null){
                    throw new AssumptionFailedError("Every block state should have an associated meta value");
                }
            }
            $descriptor = new IntIdMetaItemDescriptor($id, $meta);
        }elseif($ingredient instanceof TagWildcardRecipeIngredient){
            $descriptor = new TagItemDescriptor($ingredient->getTagName());
        }else{
            throw new \LogicException("Unsupported recipe ingredient type " . get_class($ingredient) . ", only " . ExactRecipeIngredient::class . " and " . MetaWildcardRecipeIngredient::class . " are supported");
        }
 
        return new ProtocolRecipeIngredient($descriptor, 1);
    }
 
    public function netRecipeIngredientToCore(ProtocolRecipeIngredient $ingredient) : ?RecipeIngredient{
        $descriptor = $ingredient->getDescriptor();
        if($descriptor === null){
            return null;
        }
 
        if($descriptor instanceof TagItemDescriptor){
            return new TagWildcardRecipeIngredient($descriptor->getTag());
        }
 
        if($descriptor instanceof IntIdMetaItemDescriptor){
            $stringId = $this->itemTypeDictionary->fromIntId($descriptor->getId());
            $meta = $descriptor->getMeta();
        }elseif($descriptor instanceof StringIdMetaItemDescriptor){
            $stringId = $descriptor->getId();
            $meta = $descriptor->getMeta();
        }else{
            throw new \LogicException("Unsupported conversion of recipe ingredient to core item stack");
        }
 
        if($meta === self::RECIPE_INPUT_WILDCARD_META){
            return new MetaWildcardRecipeIngredient($stringId);
        }
 
        $blockRuntimeId = null;
        if(($blockId = $this->blockItemIdMap->lookupBlockId($stringId)) !== null){
            $blockRuntimeId = $this->blockTranslator->getBlockStateDictionary()->lookupStateIdFromIdMeta($blockId, $meta);
            if($blockRuntimeId !== null){
                $meta = 0;
            }
        }
        $result = $this->itemTranslator->fromNetworkId(
            $this->itemTypeDictionary->fromStringId($stringId),
            $meta,
            $blockRuntimeId ?? ItemTranslator::NO_BLOCK_RUNTIME_ID
        );
        return new ExactRecipeIngredient($result);
    }
 
    protected function stripBlockEntityNBT(CompoundTag $tag) : bool{
        if(($tag->getTag(Item::TAG_BLOCK_ENTITY_TAG)) !== null){
            //client doesn't use this tag, so it's fine to delete completely
            $tag->removeTag(Item::TAG_BLOCK_ENTITY_TAG);
            return true;
        }
        return false;
    }
 
    protected function stripContainedItemNonVisualNBT(CompoundTag $tag) : bool{
        try{
            $blockEntityInventoryTag = $tag->getListTag(Container::TAG_ITEMS, CompoundTag::class);
        }catch(UnexpectedTagTypeException){
            return false;
        }
        if($blockEntityInventoryTag !== null && $blockEntityInventoryTag->count() > 0){
            $stripped = new ListTag();
 
            foreach($blockEntityInventoryTag as $itemTag){
                try{
                    $containedItem = Item::nbtDeserialize($itemTag);
                    $customName = $containedItem->getCustomName();
                    $containedItem->clearNamedTag();
                    $containedItem->setCustomName($customName);
                    $stripped->push($containedItem->nbtSerialize());
                }catch(SavedDataLoadingException){
                    continue;
                }
            }
            $tag->setTag(Container::TAG_ITEMS, $stripped);
            return true;
        }
        return false;
    }
 
    protected function hashNBT(Tag $tag) : string{
        $encoded = (new LittleEndianNbtSerializer())->write(new TreeRoot($tag));
        return hash('sha256', $encoded, binary: true);
    }
 
    protected function cleanupUnnecessaryItemNBT(CompoundTag $original) : CompoundTag{
        $tag = clone $original;
        $anythingStripped = false;
        foreach([
            $this->stripContainedItemNonVisualNBT($tag),
            $this->stripBlockEntityNBT($tag)
        ] as $stripped){
            $anythingStripped = $anythingStripped || $stripped;
        }
 
        if($anythingStripped){
            $tag->setByteArray(self::PM_FULL_NBT_HASH_TAG, $this->hashNBT($original));
        }
        return $tag;
    }
 
    public function coreItemStackToNet(Item $itemStack) : ItemStack{
        if($itemStack->isNull()){
            return ItemStack::null();
        }
        $nbt = $itemStack->getNamedTag();
        if($nbt->count() === 0){
            $nbt = null;
        }else{
            $nbt = $this->cleanupUnnecessaryItemNBT($nbt);
        }
 
        $idMeta = $this->itemTranslator->toNetworkIdQuiet($itemStack);
        if($idMeta === null){
            //Display unmapped items as INFO_UPDATE, but stick something in their NBT to make sure they don't stack with
            //other unmapped items.
            [$id, $meta, $blockRuntimeId] = $this->itemTranslator->toNetworkId(VanillaBlocks::INFO_UPDATE()->asItem());
            if($nbt === null){
                $nbt = new CompoundTag();
            }
            $nbt->setLong(self::PM_ID_TAG, $itemStack->getStateId());
        }else{
            [$id, $meta, $blockRuntimeId] = $idMeta;
        }
 
        $extraData = $id === $this->shieldRuntimeId ?
            new ItemStackExtraDataShield($nbt, canPlaceOn: [], canDestroy: [], blockingTick: 0) :
            new ItemStackExtraData($nbt, canPlaceOn: [], canDestroy: []);
        $extraDataSerializer = new ByteBufferWriter();
        $extraData->write($extraDataSerializer);
 
        return new ItemStack(
            $id,
            $meta,
            $itemStack->getCount(),
            $blockRuntimeId ?? ItemTranslator::NO_BLOCK_RUNTIME_ID,
            $extraDataSerializer->getData(),
        );
    }
 
    public function netItemStackToCore(ItemStack $itemStack) : Item{
        if($itemStack->getId() === 0){
            return VanillaItems::AIR();
        }
        $extraData = $this->deserializeItemStackExtraData($itemStack->getRawExtraData(), $itemStack->getId());
 
        $compound = $extraData->getNbt();
 
        $itemResult = $this->itemTranslator->fromNetworkId($itemStack->getId(), $itemStack->getMeta(), $itemStack->getBlockRuntimeId());
 
        if($compound !== null){
            $compound = clone $compound;
        }
 
        $itemResult->setCount($itemStack->getCount());
        if($compound !== null){
            try{
                $itemResult->setNamedTag($compound);
            }catch(NbtException $e){
                throw TypeConversionException::wrap($e, "Bad itemstack NBT data");
            }
        }
 
        return $itemResult;
    }
 
    public function deserializeItemStackExtraData(string $extraData, int $id) : ItemStackExtraData{
        $extraDataDeserializer = new ByteBufferReader($extraData);
        return $id === $this->shieldRuntimeId ?
            ItemStackExtraDataShield::read($extraDataDeserializer) :
            ItemStackExtraData::read($extraDataDeserializer);
    }
}