EnchantInventory.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\block\inventory;
 
use pocketmine\event\player\PlayerEnchantingOptionsRequestEvent;
use pocketmine\inventory\SimpleInventory;
use pocketmine\inventory\TemporaryInventory;
use pocketmine\item\enchantment\EnchantingHelper as Helper;
use pocketmine\item\enchantment\EnchantingOption;
use pocketmine\item\Item;
use pocketmine\world\Position;
use function array_values;
use function count;
 
class EnchantInventory extends SimpleInventory implements BlockInventory, TemporaryInventory{
    use BlockInventoryTrait;
 
    public const SLOT_INPUT = 0;
    public const SLOT_LAPIS = 1;
 
    private array $options = [];
 
    public function __construct(Position $holder){
        $this->holder = $holder;
        parent::__construct(2);
    }
 
    protected function onSlotChange(int $index, Item $before) : void{
        if($index === self::SLOT_INPUT){
            foreach($this->viewers as $viewer){
                $this->options = [];
                $item = $this->getInput();
                $options = Helper::generateOptions($this->holder, $item, $viewer->getEnchantmentSeed());
 
                $event = new PlayerEnchantingOptionsRequestEvent($viewer, $this, $options);
                $event->call();
                if(!$event->isCancelled() && count($event->getOptions()) > 0){
                    $this->options = array_values($event->getOptions());
                    $viewer->getNetworkSession()->getInvManager()?->syncEnchantingTableOptions($this->options);
                }
            }
        }
 
        parent::onSlotChange($index, $before);
    }
 
    public function getInput() : Item{
        return $this->getItem(self::SLOT_INPUT);
    }
 
    public function getLapis() : Item{
        return $this->getItem(self::SLOT_LAPIS);
    }
 
    public function getOutput(int $optionId) : ?Item{
        $option = $this->getOption($optionId);
        return $option === null ? null : Helper::enchantItem($this->getInput(), $option->getEnchantments());
    }
 
    public function getOption(int $optionId) : ?EnchantingOption{
        return $this->options[$optionId] ?? null;
    }
}