<?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);

/**
 * All the Item classes
 */
namespace pocketmine\item;

use pocketmine\block\Block;
use pocketmine\entity\Entity;
use pocketmine\inventory\Fuel;
use pocketmine\item\enchantment\Enchantment;
use pocketmine\level\Level;
use pocketmine\nbt\NBT;
use pocketmine\nbt\tag\ByteTag;
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\nbt\tag\ListTag;
use pocketmine\nbt\tag\ShortTag;
use pocketmine\nbt\tag\StringTag;
use pocketmine\nbt\tag\Tag;
use pocketmine\Player;
use pocketmine\Server;
use pocketmine\utils\Binary;
use pocketmine\utils\Config;

class Item implements ItemIds, \JsonSerializable{

	/** @var NBT */
	private static $cachedParser = null;

	private static function parseCompoundTag(string $tag) : CompoundTag{
		if(strlen($tag) === 0){
			throw new \InvalidArgumentException("No NBT data found in supplied string");
		}

		if(self::$cachedParser === null){
			self::$cachedParser = new NBT(NBT::LITTLE_ENDIAN);
		}

		self::$cachedParser->read($tag);
		$data = self::$cachedParser->getData();

		if(!($data instanceof CompoundTag)){
			throw new \InvalidArgumentException("Invalid item NBT string given, it could not be deserialized");
		}

		return $data;
	}

	private static function writeCompoundTag(CompoundTag $tag) : string{
		if(self::$cachedParser === null){
			self::$cachedParser = new NBT(NBT::LITTLE_ENDIAN);
		}

		self::$cachedParser->setData($tag);
		return self::$cachedParser->write();
	}

	/** @var \SplFixedArray */
	public static $list = null;
	/** @var Block|null */
	protected $block;
	/** @var int */
	protected $id;
	/** @var int */
	protected $meta;
	/** @var string */
	private $tags = "";
	/** @var CompoundTag|null */
	private $cachedNBT = null;
	/** @var int */
	public $count;
	/** @var string */
	protected $name;

	public function canBeActivated(){
		return false;
	}

	public static function init(){
		if(self::$list === null){
			self::$list = new \SplFixedArray(65536);
			self::$list[self::IRON_SHOVEL] = IronShovel::class;
			self::$list[self::IRON_PICKAXE] = IronPickaxe::class;
			self::$list[self::IRON_AXE] = IronAxe::class;
			self::$list[self::FLINT_STEEL] = FlintSteel::class;
			self::$list[self::APPLE] = Apple::class;
			self::$list[self::BOW] = Bow::class;
			self::$list[self::ARROW] = Arrow::class;
			self::$list[self::COAL] = Coal::class;
			self::$list[self::DIAMOND] = Diamond::class;
			self::$list[self::IRON_INGOT] = IronIngot::class;
			self::$list[self::GOLD_INGOT] = GoldIngot::class;
			self::$list[self::IRON_SWORD] = IronSword::class;
			self::$list[self::WOODEN_SWORD] = WoodenSword::class;
			self::$list[self::WOODEN_SHOVEL] = WoodenShovel::class;
			self::$list[self::WOODEN_PICKAXE] = WoodenPickaxe::class;
			self::$list[self::WOODEN_AXE] = WoodenAxe::class;
			self::$list[self::STONE_SWORD] = StoneSword::class;
			self::$list[self::STONE_SHOVEL] = StoneShovel::class;
			self::$list[self::STONE_PICKAXE] = StonePickaxe::class;
			self::$list[self::STONE_AXE] = StoneAxe::class;
			self::$list[self::DIAMOND_SWORD] = DiamondSword::class;
			self::$list[self::DIAMOND_SHOVEL] = DiamondShovel::class;
			self::$list[self::DIAMOND_PICKAXE] = DiamondPickaxe::class;
			self::$list[self::DIAMOND_AXE] = DiamondAxe::class;
			self::$list[self::STICK] = Stick::class;
			self::$list[self::BOWL] = Bowl::class;
			self::$list[self::MUSHROOM_STEW] = MushroomStew::class;
			self::$list[self::GOLD_SWORD] = GoldSword::class;
			self::$list[self::GOLD_SHOVEL] = GoldShovel::class;
			self::$list[self::GOLD_PICKAXE] = GoldPickaxe::class;
			self::$list[self::GOLD_AXE] = GoldAxe::class;
			self::$list[self::STRING] = StringItem::class;
			self::$list[self::FEATHER] = Feather::class;
			self::$list[self::GUNPOWDER] = Gunpowder::class;
			self::$list[self::WOODEN_HOE] = WoodenHoe::class;
			self::$list[self::STONE_HOE] = StoneHoe::class;
			self::$list[self::IRON_HOE] = IronHoe::class;
			self::$list[self::DIAMOND_HOE] = DiamondHoe::class;
			self::$list[self::GOLD_HOE] = GoldHoe::class;
			self::$list[self::WHEAT_SEEDS] = WheatSeeds::class;
			self::$list[self::WHEAT] = Wheat::class;
			self::$list[self::BREAD] = Bread::class;
			self::$list[self::LEATHER_CAP] = LeatherCap::class;
			self::$list[self::LEATHER_TUNIC] = LeatherTunic::class;
			self::$list[self::LEATHER_PANTS] = LeatherPants::class;
			self::$list[self::LEATHER_BOOTS] = LeatherBoots::class;
			self::$list[self::CHAIN_HELMET] = ChainHelmet::class;
			self::$list[self::CHAIN_CHESTPLATE] = ChainChestplate::class;
			self::$list[self::CHAIN_LEGGINGS] = ChainLeggings::class;
			self::$list[self::CHAIN_BOOTS] = ChainBoots::class;
			self::$list[self::IRON_HELMET] = IronHelmet::class;
			self::$list[self::IRON_CHESTPLATE] = IronChestplate::class;
			self::$list[self::IRON_LEGGINGS] = IronLeggings::class;
			self::$list[self::IRON_BOOTS] = IronBoots::class;
			self::$list[self::DIAMOND_HELMET] = DiamondHelmet::class;
			self::$list[self::DIAMOND_CHESTPLATE] = DiamondChestplate::class;
			self::$list[self::DIAMOND_LEGGINGS] = DiamondLeggings::class;
			self::$list[self::DIAMOND_BOOTS] = DiamondBoots::class;
			self::$list[self::GOLD_HELMET] = GoldHelmet::class;
			self::$list[self::GOLD_CHESTPLATE] = GoldChestplate::class;
			self::$list[self::GOLD_LEGGINGS] = GoldLeggings::class;
			self::$list[self::GOLD_BOOTS] = GoldBoots::class;
			self::$list[self::FLINT] = Flint::class;
			self::$list[self::RAW_PORKCHOP] = RawPorkchop::class;
			self::$list[self::COOKED_PORKCHOP] = CookedPorkchop::class;
			self::$list[self::PAINTING] = Painting::class;
			self::$list[self::GOLDEN_APPLE] = GoldenApple::class;
			self::$list[self::SIGN] = Sign::class;
			self::$list[self::WOODEN_DOOR] = WoodenDoor::class;
			self::$list[self::BUCKET] = Bucket::class;
			self::$list[self::MINECART] = Minecart::class;
			self::$list[self::IRON_DOOR] = IronDoor::class;
			self::$list[self::REDSTONE] = Redstone::class;
			self::$list[self::SNOWBALL] = Snowball::class;
			self::$list[self::BOAT] = Boat::class;
			self::$list[self::LEATHER] = Leather::class;
			self::$list[self::BRICK] = Brick::class;
			self::$list[self::CLAY] = Clay::class;
			self::$list[self::SUGARCANE] = Sugarcane::class;
			self::$list[self::PAPER] = Paper::class;
			self::$list[self::BOOK] = Book::class;
			self::$list[self::SLIMEBALL] = Slimeball::class;
			self::$list[self::EGG] = Egg::class;
			self::$list[self::COMPASS] = Compass::class;
			self::$list[self::FISHING_ROD] = FishingRod::class;
			self::$list[self::CLOCK] = Clock::class;
			self::$list[self::GLOWSTONE_DUST] = GlowstoneDust::class;
			self::$list[self::RAW_FISH] = Fish::class;
			self::$list[self::COOKED_FISH] = CookedFish::class;
			self::$list[self::DYE] = Dye::class;
			self::$list[self::BONE] = Bone::class;
			self::$list[self::SUGAR] = Sugar::class;
			self::$list[self::CAKE] = Cake::class;
			self::$list[self::BED] = Bed::class;
			self::$list[self::COOKIE] = Cookie::class;
			self::$list[self::SHEARS] = Shears::class;
			self::$list[self::MELON] = Melon::class;
			self::$list[self::PUMPKIN_SEEDS] = PumpkinSeeds::class;
			self::$list[self::MELON_SEEDS] = MelonSeeds::class;
			self::$list[self::RAW_BEEF] = RawBeef::class;
			self::$list[self::STEAK] = Steak::class;
			self::$list[self::RAW_CHICKEN] = RawChicken::class;
			self::$list[self::COOKED_CHICKEN] = CookedChicken::class;
			self::$list[self::GOLD_NUGGET] = GoldNugget::class;
			self::$list[self::NETHER_WART] = NetherWart::class;
			self::$list[self::POTION] = Potion::class;
			self::$list[self::GLASS_BOTTLE] = GlassBottle::class;
			self::$list[self::SPIDER_EYE] = SpiderEye::class;
			self::$list[self::FERMENTED_SPIDER_EYE] = FermentedSpiderEye::class;
			self::$list[self::BLAZE_POWDER] = BlazePowder::class;
			self::$list[self::MAGMA_CREAM] = MagmaCream::class;
			self::$list[self::BREWING_STAND] = BrewingStand::class;
			self::$list[self::GLISTERING_MELON] = GlisteringMelon::class;
			self::$list[self::SPAWN_EGG] = SpawnEgg::class;
			self::$list[self::EMERALD] = Emerald::class;
			self::$list[self::ITEM_FRAME] = ItemFrame::class;
			self::$list[self::FLOWER_POT] = FlowerPot::class;
			self::$list[self::CARROT] = Carrot::class;
			self::$list[self::POTATO] = Potato::class;
			self::$list[self::BAKED_POTATO] = BakedPotato::class;
			self::$list[self::GOLDEN_CARROT] = GoldenCarrot::class;
			self::$list[self::MOB_HEAD] = MobHead::class;
			self::$list[self::PUMPKIN_PIE] = PumpkinPie::class;
			self::$list[self::NETHER_BRICK] = NetherBrick::class;
			self::$list[self::QUARTZ] = Quartz::class;
			self::$list[self::QUARTZ] = NetherQuartz::class;
			self::$list[self::COOKED_RABBIT] = CookedRabbit::class;
			// self::$list[self::CAMERA] = Camera::class;
			self::$list[self::BEETROOT] = Beetroot::class;
			self::$list[self::BEETROOT_SEEDS] = BeetrootSeeds::class;
			self::$list[self::BEETROOT_SOUP] = BeetrootSoup::class;
			self::$list[self::PRISMARINE_CRYSTALS] = PrismarineCrystals::class;
			self::$list[self::PRISMARINE_SHARD] = PrismarineShard::class;
			self::$list[self::NETHER_STAR] = NetherStar::class;
			self::$list[self::ENCHANTED_GOLDEN_APPLE] = GoldenAppleEnchanted::class;

			for($i = 0; $i < 256; ++$i){
				if(Block::$list[$i] !== null){
					self::$list[$i] = Block::$list[$i];
				}
			}
		}

		self::initCreativeItems();
	}

	private static $creative = [];

	private static function initCreativeItems(){
		self::clearCreativeItems();

		$creativeItems = new Config(Server::getInstance()->getFilePath() . "src/pocketmine/resources/creativeitems.json", Config::JSON, []);

		foreach($creativeItems->getAll() as $data){
			$item = Item::get($data["id"], $data["damage"], $data["count"], $data["nbt"]);
			if($item->getName() === "Unknown"){
				continue;
			}
			self::addCreativeItem($item);
		}
	}

	public static function clearCreativeItems(){
		Item::$creative = [];
	}

	public static function getCreativeItems() : array{
		return Item::$creative;
	}

	public static function addCreativeItem(Item $item){
		Item::$creative[] = clone $item;
	}

	public static function removeCreativeItem(Item $item){
		$index = self::getCreativeItemIndex($item);
		if($index !== -1){
			unset(Item::$creative[$index]);
		}
	}

	public static function isCreativeItem(Item $item) : bool{
		foreach(Item::$creative as $i => $d){
			if($item->equals($d, !$item->isTool())){
				return true;
			}
		}

		return false;
	}

	/**
	 * @param $index
	 *
	 * @return Item|null
	 */
	public static function getCreativeItem(int $index){
		return Item::$creative[$index] ?? null;
	}

	public static function getCreativeItemIndex(Item $item) : int{
		foreach(Item::$creative as $i => $d){
			if($item->equals($d, !$item->isTool())){
				return $i;
			}
		}

		return -1;
	}

	/**
	 * Returns an instance of the Item with the specified id, meta, count and NBT.
	 *
	 * @param int                $id
	 * @param int                $meta
	 * @param int                $count
	 * @param CompoundTag|string $tags
	 *
	 * @return Item
	 */
	public static function get(int $id, int $meta = 0, int $count = 1, $tags = "") : Item{
		try{
			$class = self::$list[$id];
			if($class === null){
				return (new Item($id, $meta, $count))->setCompoundTag($tags);
			}elseif($id < 256){
				return (new ItemBlock(new $class($meta), $meta, $count))->setCompoundTag($tags);
			}else{
				return (new $class($meta, $count))->setCompoundTag($tags);
			}
		}catch(\RuntimeException $e){
			return (new Item($id, $meta, $count))->setCompoundTag($tags);
		}
	}

	/**
	 * @param string $str
	 * @param bool   $multiple
	 *
	 * @return Item[]|Item
	 */
	public static function fromString(string $str, bool $multiple = false){
		if($multiple === true){
			$blocks = [];
			foreach(explode(",", $str) as $b){
				$blocks[] = self::fromString($b, false);
			}

			return $blocks;
		}else{
			$b = explode(":", str_replace([" ", "minecraft:"], ["_", ""], trim($str)));
			if(!isset($b[1])){
				$meta = 0;
			}else{
				$meta = $b[1] & 0xFFFF;
			}

			if(defined(Item::class . "::" . strtoupper($b[0]))){
				$item = self::get(constant(Item::class . "::" . strtoupper($b[0])), $meta);
				if($item->getId() === self::AIR and strtoupper($b[0]) !== "AIR"){
					$item = self::get($b[0] & 0xFFFF, $meta);
				}
			}else{
				$item = self::get($b[0] & 0xFFFF, $meta);
			}

			return $item;
		}
	}

	/**
	 * @param int $id
	 * @param int $meta
	 * @param int $count
	 * @param string $name
	 */
	public function __construct(int $id, int $meta = 0, int $count = 1, string $name = "Unknown"){
		$this->id = $id & 0xffff;
		$this->meta = $meta !== -1 ? $meta & 0xffff : -1;
		$this->count = $count;
		$this->name = $name;
		if(!isset($this->block) and $this->id <= 0xff and isset(Block::$list[$this->id])){
			$this->block = Block::get($this->id, $this->meta);
			$this->name = $this->block->getName();
		}
	}

	/**
	 * Sets the Item's NBT
	 *
	 * @param CompoundTag|string $tags
	 *
	 * @return $this
	 */
	public function setCompoundTag($tags){
		if($tags instanceof CompoundTag){
			$this->setNamedTag($tags);
		}else{
			$this->tags = (string) $tags;
			$this->cachedNBT = null;
		}

		return $this;
	}

	/**
	 * Returns the serialized NBT of the Item
	 * @return string
	 */
	public function getCompoundTag() : string{
		return $this->tags;
	}

	/**
	 * Returns whether this Item has a non-empty NBT.
	 * @return bool
	 */
	public function hasCompoundTag() : bool{
		return $this->tags !== "";
	}

	/**
	 * @return bool
	 */
	public function hasCustomBlockData() : bool{
		if(!$this->hasCompoundTag()){
			return false;
		}

		$tag = $this->getNamedTag();
		if(isset($tag->BlockEntityTag) and $tag->BlockEntityTag instanceof CompoundTag){
			return true;
		}

		return false;
	}

	public function clearCustomBlockData(){
		if(!$this->hasCompoundTag()){
			return $this;
		}
		$tag = $this->getNamedTag();

		if(isset($tag->BlockEntityTag) and $tag->BlockEntityTag instanceof CompoundTag){
			unset($tag->BlockEntityTag);
			$this->setNamedTag($tag);
		}

		return $this;
	}

	/**
	 * @param CompoundTag $compound
	 *
	 * @return $this
	 */
	public function setCustomBlockData(CompoundTag $compound){
		$tags = clone $compound;
		$tags->setName("BlockEntityTag");

		if(!$this->hasCompoundTag()){
			$tag = new CompoundTag("", []);
		}else{
			$tag = $this->getNamedTag();
		}

		$tag->BlockEntityTag = $tags;
		$this->setNamedTag($tag);

		return $this;
	}

	/**
	 * @return CompoundTag|null
	 */
	public function getCustomBlockData(){
		if(!$this->hasCompoundTag()){
			return null;
		}

		$tag = $this->getNamedTag();
		if(isset($tag->BlockEntityTag) and $tag->BlockEntityTag instanceof CompoundTag){
			return $tag->BlockEntityTag;
		}

		return null;
	}

	/**
	 * @return bool
	 */
	public function hasEnchantments() : bool{
		if(!$this->hasCompoundTag()){
			return false;
		}

		$tag = $this->getNamedTag();
		if(isset($tag->ench)){
			$tag = $tag->ench;
			if($tag instanceof ListTag){
				return true;
			}
		}

		return false;
	}

	/**
	 * @param int $id
	 *
	 * @return Enchantment|null
	 */
	public function getEnchantment(int $id){
		if(!$this->hasEnchantments()){
			return null;
		}

		foreach($this->getNamedTag()->ench as $entry){
			if($entry["id"] === $id){
				$e = Enchantment::getEnchantment($entry["id"]);
				$e->setLevel($entry["lvl"]);
				return $e;
			}
		}

		return null;
	}

	/**
	 * @param Enchantment $ench
	 */
	public function addEnchantment(Enchantment $ench){
		if(!$this->hasCompoundTag()){
			$tag = new CompoundTag("", []);
		}else{
			$tag = $this->getNamedTag();
		}

		if(!isset($tag->ench)){
			$tag->ench = new ListTag("ench", []);
			$tag->ench->setTagType(NBT::TAG_Compound);
		}

		$found = false;

		foreach($tag->ench as $k => $entry){
			if($entry["id"] === $ench->getId()){
				$tag->ench->{$k} = new CompoundTag("", [
					new ShortTag("id", $ench->getId()),
					new ShortTag("lvl", $ench->getLevel())
				]);
				$found = true;
				break;
			}
		}

		if(!$found){
			$tag->ench->{count($tag->ench) + 1} = new CompoundTag("", [
				new ShortTag("id", $ench->getId()),
				new ShortTag("lvl", $ench->getLevel())
			]);
		}

		$this->setNamedTag($tag);
	}

	/**
	 * @return Enchantment[]
	 */
	public function getEnchantments() : array{
		if(!$this->hasEnchantments()){
			return [];
		}

		$enchantments = [];

		foreach($this->getNamedTag()->ench as $entry){
			$e = Enchantment::getEnchantment($entry["id"]);
			$e->setLevel($entry["lvl"]);
			$enchantments[] = $e;
		}

		return $enchantments;
	}

	/**
	 * @return bool
	 */
	public function hasCustomName() : bool{
		if(!$this->hasCompoundTag()){
			return false;
		}

		$tag = $this->getNamedTag();
		if(isset($tag->display)){
			$tag = $tag->display;
			if($tag instanceof CompoundTag and isset($tag->Name) and $tag->Name instanceof StringTag){
				return true;
			}
		}

		return false;
	}

	/**
	 * @return string
	 */
	public function getCustomName() : string{
		if(!$this->hasCompoundTag()){
			return "";
		}

		$tag = $this->getNamedTag();
		if(isset($tag->display)){
			$tag = $tag->display;
			if($tag instanceof CompoundTag and isset($tag->Name) and $tag->Name instanceof StringTag){
				return $tag->Name->getValue();
			}
		}

		return "";
	}

	/**
	 * @param string $name
	 *
	 * @return $this
	 */
	public function setCustomName(string $name){
		if($name === ""){
			$this->clearCustomName();
		}

		if(!$this->hasCompoundTag()){
			$tag = new CompoundTag("", []);
		}else{
			$tag = $this->getNamedTag();
		}

		if(isset($tag->display) and $tag->display instanceof CompoundTag){
			$tag->display->Name = new StringTag("Name", $name);
		}else{
			$tag->display = new CompoundTag("display", [
				new StringTag("Name", $name)
			]);
		}

		$this->setCompoundTag($tag);

		return $this;
	}

	/**
	 * @return $this
	 */
	public function clearCustomName(){
		if(!$this->hasCompoundTag()){
			return $this;
		}
		$tag = $this->getNamedTag();

		if(isset($tag->display) and $tag->display instanceof CompoundTag){
			unset($tag->display->Name);
			if($tag->display->getCount() === 0){
				unset($tag->display);
			}

			$this->setNamedTag($tag);
		}

		return $this;
	}

	public function getLore() : array{
		$tag = $this->getNamedTagEntry("display");
		if($tag instanceof CompoundTag and isset($tag->Lore) and $tag->Lore instanceof ListTag){
			$lines = [];
			foreach($tag->Lore->getValue() as $line){
				$lines[] = $line->getValue();
			}

			return $lines;
		}

		return [];
	}

	/**
	 * @param string[] $lines
	 *
	 * @return $this
	 */
	public function setLore(array $lines){
		$tag = $this->getNamedTag() ?? new CompoundTag("", []);
		if(!isset($tag->display)){
			$tag->display = new CompoundTag("display", []);
		}
		$tag->display->Lore = new ListTag("Lore");
		$tag->display->Lore->setTagType(NBT::TAG_String);
		$count = 0;
		foreach($lines as $line){
			$tag->display->Lore[$count++] = new StringTag("", $line);
		}

		$this->setNamedTag($tag);

		return $this;
	}

	/**
	 * @param $name
	 * @return Tag|null
	 */
	public function getNamedTagEntry($name){
		$tag = $this->getNamedTag();
		if($tag !== null){
			return $tag->{$name} ?? null;
		}

		return null;
	}

	/**
	 * Returns a tree of Tag objects representing the Item's NBT
	 * @return null|CompoundTag
	 */
	public function getNamedTag(){
		if(!$this->hasCompoundTag()){
			return null;
		}elseif($this->cachedNBT !== null){
			return $this->cachedNBT;
		}
		return $this->cachedNBT = self::parseCompoundTag($this->tags);
	}

	/**
	 * Sets the Item's NBT from the supplied CompoundTag object.
	 * @param CompoundTag $tag
	 *
	 * @return $this
	 */
	public function setNamedTag(CompoundTag $tag){
		if($tag->getCount() === 0){
			return $this->clearNamedTag();
		}

		$this->cachedNBT = $tag;
		$this->tags = self::writeCompoundTag($tag);

		return $this;
	}

	/**
	 * Removes the Item's NBT.
	 * @return Item
	 */
	public function clearNamedTag(){
		return $this->setCompoundTag("");
	}

	/**
	 * @return int
	 */
	public function getCount() : int{
		return $this->count;
	}

	/**
	 * @param int $count
	 */
	public function setCount(int $count){
		$this->count = $count;
	}

	/**
	 * Returns the name of the item, or the custom name if it is set.
	 * @return string
	 */
	final public function getName() : string{
		return $this->hasCustomName() ? $this->getCustomName() : $this->name;
	}

	/**
	 * @return bool
	 */
	final public function canBePlaced() : bool{
		return $this->block !== null and $this->block->canBePlaced();
	}

	/**
	 * Returns whether an entity can eat or drink this item.
	 * @return bool
	 */
	public function canBeConsumed() : bool{
		return false;
	}

	/**
	 * Returns whether this item can be consumed by the supplied Entity.
	 * @param Entity $entity
	 *
	 * @return bool
	 */
	public function canBeConsumedBy(Entity $entity) : bool{
		return $this->canBeConsumed();
	}

	/**
	 * Called when the item is consumed by an Entity.
	 * @param Entity $entity
	 */
	public function onConsume(Entity $entity){

	}

	/**
	 * Returns the block corresponding to this Item.
	 * @return Block
	 */
	public function getBlock() : Block{
		if($this->block instanceof Block){
			return clone $this->block;
		}else{
			return Block::get(self::AIR);
		}
	}

	/**
	 * @return int
	 */
	final public function getId() : int{
		return $this->id;
	}

	/**
	 * @return int
	 */
	final public function getDamage() : int{
		return $this->meta;
	}

	/**
	 * @param int $meta
	 */
	public function setDamage(int $meta){
		$this->meta = $meta !== -1 ? $meta & 0xFFFF : -1;
	}

	/**
	 * Returns whether this item can match any item with an equivalent ID with any meta value.
	 * Used in crafting recipes which accept multiple variants of the same item, for example crafting tables recipes.
	 *
	 * @return bool
	 */
	public function hasAnyDamageValue() : bool{
		return $this->meta === -1;
	}

	/**
	 * Returns the highest amount of this item which will fit into one inventory slot.
	 * @return int
	 */
	public function getMaxStackSize(){
		return 64;
	}

	final public function getFuelTime(){
		if(!isset(Fuel::$duration[$this->id])){
			return null;
		}
		if($this->id !== self::BUCKET or $this->meta === 10){
			return Fuel::$duration[$this->id];
		}

		return null;
	}

	/**
	 * @param Entity|Block $object
	 *
	 * @return bool
	 */
	public function useOn($object){
		return false;
	}

	/**
	 * @return bool
	 */
	public function isTool(){
		return false;
	}

	/**
	 * @return int|bool
	 */
	public function getMaxDurability(){
		return false;
	}

	public function isPickaxe(){
		return false;
	}

	public function isAxe(){
		return false;
	}

	public function isSword(){
		return false;
	}

	public function isShovel(){
		return false;
	}

	public function isHoe(){
		return false;
	}

	public function isShears(){
		return false;
	}

	public function getDestroySpeed(Block $block, Player $player){
		return 1;
	}

	/**
	 * Called when a player uses this item on a block.
	 *
	 * @param Level $level
	 * @param Player $player
	 * @param Block $block
	 * @param Block $target
	 * @param int $face
	 * @param float $fx
	 * @param float $fy
	 * @param float $fz
	 *
	 * @return bool
	 */
	public function onActivate(Level $level, Player $player, Block $block, Block $target, $face, $fx, $fy, $fz){
		return false;
	}

	/**
	 * Compares an Item to this Item and check if they match.
	 *
	 * @param Item $item
	 * @param bool $checkDamage Whether to verify that the damage values match.
	 * @param bool $checkCompound Whether to verify that the items' NBT match.
	 *
	 * @return bool
	 */
	final public function equals(Item $item, bool $checkDamage = true, bool $checkCompound = true) : bool{
		if($this->id === $item->getId() and ($checkDamage === false or $this->getDamage() === $item->getDamage())){
			if($checkCompound){
				if($item->getCompoundTag() === $this->getCompoundTag()){
					return true;
				}elseif($this->hasCompoundTag() and $item->hasCompoundTag()){
					//Serialized NBT didn't match, check the cached object tree.
					return NBT::matchTree($this->getNamedTag(), $item->getNamedTag());
				}
			}else{
				return true;
			}
		}

		return false;
	}

	/**
	 * @deprecated Use {@link Item#equals} instead, this method will be removed in the future.
	 *
	 * @param Item $item
	 * @param bool $checkDamage
	 * @param bool $checkCompound
	 *
	 * @return bool
	 */
	final public function deepEquals(Item $item, bool $checkDamage = true, bool $checkCompound = true) : bool{
		return $this->equals($item, $checkDamage, $checkCompound);
	}

	/**
	 * @return string
	 */
	final public function __toString() : string{
		return "Item " . $this->name . " (" . $this->id . ":" . ($this->hasAnyDamageValue() ? "?" : $this->meta) . ")x" . $this->count . ($this->hasCompoundTag() ? " tags:0x" . bin2hex($this->getCompoundTag()) : "");
	}

	/**
	 * Returns an array of item stack properties that can be serialized to json.
	 *
	 * @return array
	 */
	final public function jsonSerialize(){
		return [
			"id" => $this->id,
			"damage" => $this->meta,
			"count" => $this->count, //TODO: separate items and stacks
			"nbt" => $this->tags
		];
	}

	/**
	 * Serializes the item to an NBT CompoundTag
	 *
	 * @param int    $slot optional, the inventory slot of the item
	 * @param string $tagName the name to assign to the CompoundTag object
	 *
	 * @return CompoundTag
	 */
	public function nbtSerialize(int $slot = -1, string $tagName = "") : CompoundTag{
		$tag = new CompoundTag($tagName, [
			new ShortTag("id", $this->id),
			new ByteTag("Count", Binary::signByte($this->count)),
			new ShortTag("Damage", $this->meta),
		]);

		if($this->hasCompoundTag()){
			$tag->tag = clone $this->getNamedTag();
			$tag->tag->setName("tag");
		}

		if($slot !== -1){
			$tag->Slot = new ByteTag("Slot", $slot);
		}

		return $tag;
	}

	/**
	 * Deserializes an Item from an NBT CompoundTag
	 *
	 * @param CompoundTag $tag
	 *
	 * @return Item
	 */
	public static function nbtDeserialize(CompoundTag $tag) : Item{
		if(!isset($tag->id) or !isset($tag->Count)){
			return Item::get(0);
		}

		$count = Binary::unsignByte($tag->Count->getValue());
		$meta = isset($tag->Damage) ? $tag->Damage->getValue() : 0;

		if($tag->id instanceof ShortTag){
			$item = Item::get($tag->id->getValue(), $meta, $count);
		}elseif($tag->id instanceof StringTag){ //PC item save format
			$item = Item::fromString($tag->id->getValue());
			$item->setDamage($meta);
			$item->setCount($count);
		}else{
			throw new \InvalidArgumentException("Item CompoundTag ID must be an instance of StringTag or ShortTag, " . get_class($tag->id) . " given");
		}

		if(isset($tag->tag) and $tag->tag instanceof CompoundTag){
			$t = clone $tag->tag;
			$t->setName("");
			$item->setNamedTag($t);
		}

		return $item;
	}

	public function __clone(){
		if($this->block !== null){
			$this->block = clone $this->block;
		}

		$this->cachedNBT = null;
	}

}