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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)
 * <[email protected]>
 */

declare(strict_types=1);

namespace Cnc\Catalog\ViewModel;

use Magento\Catalog\Api\CategoryListInterface;
use Magento\Catalog\Api\Data\CategoryInterface;
use Magento\Framework\Api\FilterBuilder;
use Magento\Framework\Api\SearchCriteriaBuilder;
use Magento\Framework\Registry;
use Magento\Framework\View\Element\Block\ArgumentInterface;

class ChildrenCategories implements ArgumentInterface
{
    /**
     * @var Registry
     */
    private $registry;

    /**
     * @var CategoryListInterface
     */
    private $categoryListRepository;

    /**
     * @var SearchCriteriaBuilder
     */
    private $searchCriteriaBuilder;

    /**
     * @var FilterBuilder
     */
    private $filterBuilder;

    /**
     * ChildrenCategories constructor.
     * @param Registry $registry
     * @param CategoryListInterface $categoryListRepository
     * @param SearchCriteriaBuilder $searchCriteriaBuilder
     * @param FilterBuilder $filterBuilder
     */
    public function __construct(
        Registry $registry,
        CategoryListInterface $categoryListRepository,
        SearchCriteriaBuilder $searchCriteriaBuilder,
        FilterBuilder $filterBuilder
    ) {
        $this->registry = $registry;
        $this->categoryListRepository = $categoryListRepository;
        $this->searchCriteriaBuilder = $searchCriteriaBuilder;
        $this->filterBuilder = $filterBuilder;
    }

    /**
     * @param CategoryInterface|null $parentCategory
     * @return array
     */
    public function getChildrenCategories(CategoryInterface $parentCategory = null): array
    {
        if ($parentCategory === null) {
            $parentCategory = $this->getCurrentCategory();
        }

        $pathFilter = $this->filterBuilder
            ->setField(CategoryInterface::KEY_PATH)
            ->setConditionType('like')
            ->setValue($parentCategory->getPath() . '/%')
            ->create();

        $levelFilter = $this->filterBuilder
            ->setField(CategoryInterface::KEY_LEVEL)
            ->setConditionType('eq')
            ->setValue($parentCategory->getLevel() + 1)
            ->create();

        $this->searchCriteriaBuilder->addFilters([$pathFilter]);
        $this->searchCriteriaBuilder->addFilters([$levelFilter]);
        $searchCriteria = $this->searchCriteriaBuilder->create();

        $results = $this->categoryListRepository->getList($searchCriteria);

        return $results->getItems();
    }

    /**
     * @return CategoryInterface
     */
    public function getCurrentCategory(): CategoryInterface
    {
        return $this->registry->registry('current_category');
    }
}