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<?php
/**
 * Copyright (c) 2021 Kaliop Digital Commerce (https://digitalcommerce.kaliop.com) All Rights Reserved.
 * https://opensource.org/licenses/OSL-3.0  Open Software License (OSL 3.0)
 * Krzysztof Majkowski <[email protected]>
 */

declare(strict_types=1);

namespace Cnc\Catalog\Model\Config\Source;

use Magento\Catalog\Model\ResourceModel\Category\CollectionFactory;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Option\ArrayInterface;

class Category implements ArrayInterface
{
    const SYSTEM_CATEGORY_ID = 1;
    const ROOT_LEVEL = 1;

    /**
     * @var CollectionFactory
     */
    private $collectionFactory;

    /**
     * Category constructor.
     * @param CollectionFactory $collectionFactory
     */
    public function __construct(CollectionFactory $collectionFactory)
    {
        $this->collectionFactory = $collectionFactory;
    }

    /**
     * @return array
     * @throws LocalizedException
     */
    public function toOptionArray(): array
    {
        $optionArray = [];
        $arr = $this->toArray();
        foreach ($arr as $value => $label) {
            $optionArray[] = [
                'value' => $value,
                'label' => $label
            ];
        }
        return $optionArray;
    }

    /**
     * @return array
     * @throws LocalizedException
     */
    public function toArray(): array
    {
        $options = [];
        $options = array_replace(
            $options,
            $this->getChildren(self::SYSTEM_CATEGORY_ID, self::ROOT_LEVEL)
        );

        return $options;
    }

    /**
     * @param $parentCategoryId
     * @param $level
     * @return array
     * @throws LocalizedException
     */
    private function getChildren($parentCategoryId, $level): array
    {
        $options = [];
        $collection = $this->collectionFactory->create();
        $collection
            ->setStoreId(0)
            ->addAttributeToSelect('name')
            ->addAttributeToFilter('level', $level)
            ->addAttributeToFilter('parent_id', $parentCategoryId)
            ->setOrder('position', 'asc');

        foreach ($collection as $category) {
            $options[$category->getId()] =
                str_repeat(". ", max(0, ($category->getLevel() - 1) * 3)) . $category->getName();
            if ($category->hasChildren()) {
                $options = array_replace($options, $this->getChildren($category->getId(), $category->getLevel() + 1));
            }
        }
        return $options;
    }
}