<?php
/**
 * @module  Autogedal_SeoCanonical
 * @author  Autogedal
 * @licence OSL 3.0
 */

namespace Autogedal\SeoCanonical\Model\Config\Source;

use Magento\Catalog\Model\ResourceModel\Product\Attribute\CollectionFactory;
use Magento\Framework\Data\OptionSourceInterface;

class ProductAttributes implements OptionSourceInterface
{
    /**
     * @var CollectionFactory
     */
    protected $attributeCollectionFactory;

    /**
     * @param CollectionFactory $attributeCollectionFactory
     */
    public function __construct(
        CollectionFactory $attributeCollectionFactory
    ) {
        $this->attributeCollectionFactory = $attributeCollectionFactory;
    }

    /**
     * Get all product attributes as options array
     *
     * @return array
     */
    public function toOptionArray()
    {
        $options = [['value' => '', 'label' => __('-- Please Select --')]];

        $collection = $this->attributeCollectionFactory->create();
        $collection->addFieldToFilter('is_filterable', ['gt' => 0]);

        foreach ($collection as $attribute) {
            $options[] = [
                'value' => $attribute->getAttributeId(),
                'label' => $attribute->getFrontendLabel() . ' (' . $attribute->getAttributeCode() . ')'
            ];
        }

        return $options;
    }
}