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<?php
/**
 * Copyright © Extmag. All rights reserved.
 */

namespace Extmag\Shiplab\Model\Source;

use Magento\Eav\Model\ResourceModel\Entity\Attribute\Collection;
use Magento\Framework\Data\OptionSourceInterface;

class AttributesOfProduct implements OptionSourceInterface
{
    /**
     * @var Collection
     */
    protected $_attribute;

    /**
     * @param Collection $attribute
     */
    public function __construct(Collection $attribute)
    {
        $this->_attribute = $attribute;
    }

    /**
     * Returns array to be used in multiselect on back-end
     *
     * @return array
     */
    public function toOptionArray()
    {
        $coll = $this->_attribute->addFieldToFilter('entity_type_id', 4)
            ->setOrder('main_table.frontend_label', 'ASC');
        $attributes = $coll->load()->getItems();
        $attributeArray = [[
            'label' => __('-- Please Select --'),
            'value' => '',
        ]];

        foreach ($attributes as $attribute) {
            $attributeArray[] = [
                'label' => $attribute->getData('frontend_label') . ' [' . $attribute->getData('attribute_code') . ']',
                'value' => $attribute->getData('attribute_code'),
            ];
        }

        return $attributeArray;
    }
}