ItemStackResponseBuilder.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\handler;
 
use pocketmine\inventory\Inventory;
use pocketmine\item\Durable;
use pocketmine\network\mcpe\InventoryManager;
use pocketmine\network\mcpe\protocol\types\inventory\ContainerUIIds;
use pocketmine\network\mcpe\protocol\types\inventory\FullContainerName;
use pocketmine\network\mcpe\protocol\types\inventory\stackresponse\ItemStackResponse;
use pocketmine\network\mcpe\protocol\types\inventory\stackresponse\ItemStackResponseContainerInfo;
use pocketmine\network\mcpe\protocol\types\inventory\stackresponse\ItemStackResponseSlotInfo;
use pocketmine\utils\AssumptionFailedError;
 
final class ItemStackResponseBuilder{
 
    private array $changedSlots = [];
 
    public function __construct(
        private int $requestId,
        private InventoryManager $inventoryManager
    ){}
 
    public function addSlot(int $containerInterfaceId, int $slotId) : void{
        $this->changedSlots[$containerInterfaceId][$slotId] = $slotId;
    }
 
    private function getInventoryAndSlot(int $containerInterfaceId, int $slotId) : ?array{
        [$windowId, $slotId] = ItemStackContainerIdTranslator::translate($containerInterfaceId, $this->inventoryManager->getCurrentWindowId(), $slotId);
        $windowAndSlot = $this->inventoryManager->locateWindowAndSlot($windowId, $slotId);
        if($windowAndSlot === null){
            return null;
        }
        [$inventory, $slot] = $windowAndSlot;
        if(!$inventory->slotExists($slot)){
            return null;
        }
 
        return [$inventory, $slot];
    }
 
    public function build() : ItemStackResponse{
        $responseInfosByContainer = [];
        foreach($this->changedSlots as $containerInterfaceId => $slotIds){
            if($containerInterfaceId === ContainerUIIds::CREATED_OUTPUT){
                continue;
            }
            foreach($slotIds as $slotId){
                $inventoryAndSlot = $this->getInventoryAndSlot($containerInterfaceId, $slotId);
                if($inventoryAndSlot === null){
                    //a plugin may have closed the inventory during an event, or the slot may have been invalid
                    continue;
                }
                [$inventory, $slot] = $inventoryAndSlot;
 
                $itemStackInfo = $this->inventoryManager->getItemStackInfo($inventory, $slot);
                if($itemStackInfo === null){
                    throw new AssumptionFailedError("ItemStackInfo should never be null for an open inventory");
                }
                $item = $inventory->getItem($slot);
 
                $responseInfosByContainer[$containerInterfaceId][] = new ItemStackResponseSlotInfo(
                    $slotId,
                    $slotId,
                    $item->getCount(),
                    $itemStackInfo->getStackId(),
                    $item->getCustomName(),
                    $item instanceof Durable ? $item->getDamage() : 0,
                );
            }
        }
 
        $responseContainerInfos = [];
        foreach($responseInfosByContainer as $containerInterfaceId => $responseInfos){
            $responseContainerInfos[] = new ItemStackResponseContainerInfo(new FullContainerName($containerInterfaceId), $responseInfos);
        }
 
        return new ItemStackResponse(ItemStackResponse::RESULT_OK, $this->requestId, $responseContainerInfos);
    }
}