<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
declare(strict_types=1);

namespace Magento\CatalogGraphQl\Model\Layer;

use Magento\Catalog\Model\ResourceModel\Product\Collection;

/**
 * Collection Provider for graphql layered navigation.
 */
class CollectionProvider implements \Magento\Catalog\Model\Layer\ItemCollectionProviderInterface
{
    /**
     * @var \Magento\Catalog\Model\ResourceModel\Product\CollectionFactory
     */
    private $collectionFactory;

    /**
     * @var Collection
     */
    private $collection;

    /**
     * @var \Magento\Framework\Api\SearchCriteria\CollectionProcessorInterface
     */
    private $collectionProcessor;

    /**
     * @param \Magento\Framework\Api\SearchCriteria\CollectionProcessorInterface $collectionProcessor
     * @param \Magento\Catalog\Model\ResourceModel\Product\CollectionFactory $collectionFactory
     */
    public function __construct(
        \Magento\Framework\Api\SearchCriteria\CollectionProcessorInterface $collectionProcessor,
        \Magento\Catalog\Model\ResourceModel\Product\CollectionFactory $collectionFactory
    ) {
        $this->collectionProcessor = $collectionProcessor;
        $this->collectionFactory = $collectionFactory;
    }

    /**
     * @param \Magento\Catalog\Model\Category $category
     * @return Collection
     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
     */
    public function getCollection(\Magento\Catalog\Model\Category $category) : Collection
    {
        if (!$this->collection) {
            $this->collection = $this->collectionFactory->create();
        }
        return $this->collection;
    }
}