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<?php
/**
 * Copyright (c) 2020 Kaliop Digital Commerce (https://digitalcommerce.kaliop.com) All Rights Reserved.
 * https://opensource.org/licenses/OSL-3.0  Open Software License (OSL 3.0)
 * Cnc
 * Radosław Stępień <[email protected]> <[email protected]>
 */
namespace Cnc\Catalog\Plugin\Block\Product\View;

use Magento\Catalog\Block\Product\View\Attributes as BaseAttributes;
use Magento\Catalog\Model\Product;
use Magento\Eav\Api\AttributeRepositoryInterface;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Store\Model\ScopeInterface;

class Attributes
{
    /**
     * Attributes codes to get from children of current grouped product,
     * to assign them as grouped product additional data
     */
    const ATTRIBUTES_TO_GET_FROM_CHILDREN = [
        'weight'
    ];

    /** @var AttributeRepositoryInterface */
    protected $attributeRepository;

    /** @var ScopeConfigInterface */
    protected $scopeConfig;

    /**
     * Attributes constructor.
     * @param AttributeRepositoryInterface $attributeRepository
     * @param ScopeConfigInterface $scopeConfig
     */
    public function __construct(
        AttributeRepositoryInterface $attributeRepository,
        ScopeConfigInterface $scopeConfig
    ) {
        $this->attributeRepository = $attributeRepository;
        $this->scopeConfig = $scopeConfig;
    }

    /**
     * @param BaseAttributes $subject
     * @param array $result
     * @param array $excludeAttr
     * @return array
     * @throws NoSuchEntityException
     */
    public function afterGetAdditionalData(
        BaseAttributes $subject,
        array $result,
        array $excludeAttr = []
    ) {
        if ($subject->getProduct()->getTypeId() == 'grouped') {
            if (count($relatedProducts
                = $subject->getProduct()->getTypeInstance()->getAssociatedProducts($subject->getProduct()))) {
                /** @var Product $child */
                $child = reset($relatedProducts);
                foreach (self::ATTRIBUTES_TO_GET_FROM_CHILDREN as $attributeCode) {
                    $attribute = $this->attributeRepository->get(Product::ENTITY, $attributeCode);
                    $value = $attribute->getFrontend()->getValue($child);
                    if ($attributeCode == 'weight') {
                        $value = number_format($value, 2) . ' ' .
                        $this->scopeConfig->getValue(
                            'general/locale/weight_unit',
                            ScopeInterface::SCOPE_STORE
                        );
                    }
                    $result[$attribute->getAttributeCode()] = [
                        'label' => $attribute->getStoreLabel(),
                        'value' => $value,
                        'code' => $attribute->getAttributeCode(),
                    ];
                }
            }
        }
        return $result;
    }
}