Wishlist.php

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<?php
namespace Magento\Wishlist\CustomerData;

use Magento\Catalog\Model\Product\Image\NotLoadInfoImageException;
use Magento\Customer\CustomerData\SectionSourceInterface;
use Magento\Framework\App\ObjectManager;

class Wishlist implements SectionSourceInterface
{
    const SIDEBAR_ITEMS_NUMBER = 3;

    protected $wishlistHelper;

    protected $imageHelperFactory;

    protected $view;

    protected $block;

    private $itemResolver;

    public function __construct(
        \Magento\Wishlist\Helper\Data $wishlistHelper,
        \Magento\Wishlist\Block\Customer\Sidebar $block,
        \Magento\Catalog\Helper\ImageFactory $imageHelperFactory,
        \Magento\Framework\App\ViewInterface $view,
        \Magento\Catalog\Model\Product\Configuration\Item\ItemResolverInterface $itemResolver = null
    ) {
        $this->wishlistHelper = $wishlistHelper;
        $this->imageHelperFactory = $imageHelperFactory;
        $this->block = $block;
        $this->view = $view;
        $this->itemResolver = $itemResolver ?: ObjectManager::getInstance()->get(
            \Magento\Catalog\Model\Product\Configuration\Item\ItemResolverInterface::class
        );
    }

    public function getSectionData()
    {
        $counter = $this->getCounter();
        return [
            'counter' => $counter,
            'items' => $counter ? $this->getItems() : [],
        ];
    }

    protected function getCounter()
    {
        return $this->createCounter($this->wishlistHelper->getItemCount());
    }

    protected function createCounter($count)
    {
        if ($count > 1) {
            return __('%1 items', $count);
        } elseif ($count == 1) {
            return __('1 item');
        }
        return null;
    }

    protected function getItems()
    {
        $this->view->loadLayout();

        $collection = $this->wishlistHelper->getWishlistItemCollection();
        $collection->clear()->setPageSize(self::SIDEBAR_ITEMS_NUMBER)
            ->setInStockFilter(true)->setOrder('added_at');

        $items = [];
        foreach ($collection as $wishlistItem) {
            $items[] = $this->getItemData($wishlistItem);
        }
        return $items;
    }

    protected function getItemData(\Magento\Wishlist\Model\Item $wishlistItem)
    {
        $product = $wishlistItem->getProduct();
        return [
            'image' => $this->getImageData($this->itemResolver->getFinalProduct($wishlistItem)),
            'product_sku' => $product->getSku(),
            'product_id' => $product->getId(),
            'product_url' => $this->wishlistHelper->getProductUrl($wishlistItem),
            'product_name' => $product->getName(),
            'product_price' => $this->block->getProductPriceHtml(
                $product,
                'wishlist_configured_price',
                \Magento\Framework\Pricing\Render::ZONE_ITEM_LIST,
                ['item' => $wishlistItem]
            ),
            'product_is_saleable_and_visible' => $product->isSaleable() && $product->isVisibleInSiteVisibility(),
            'product_has_required_options' => $product->getTypeInstance()->hasRequiredOptions($product),
            'add_to_cart_params' => $this->wishlistHelper->getAddToCartParams($wishlistItem),
            'delete_item_params' => $this->wishlistHelper->getRemoveParams($wishlistItem),
        ];
    }

    protected function getImageData($product)
    {
        $helper = $this->imageHelperFactory->create()
            ->init($product, 'wishlist_sidebar_block');

        $template = 'Magento_Catalog/product/image_with_borders';

        try {
            $imagesize = $helper->getResizedImageInfo();
        } catch (NotLoadInfoImageException $exception) {
            $imagesize = [$helper->getWidth(), $helper->getHeight()];
        }

        $width = $helper->getFrame()
            ? $helper->getWidth()
            : $imagesize[0];

        $height = $helper->getFrame()
            ? $helper->getHeight()
            : $imagesize[1];

        return [
            'template' => $template,
            'src' => $helper->getUrl(),
            'width' => $width,
            'height' => $height,
            'alt' => $helper->getLabel(),
        ];
    }
}