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

namespace Magento\Catalog\Plugin\Block;

use Magento\Catalog\Model\Category;
use Magento\Framework\Data\Collection;
use Magento\Framework\Data\Tree\Node;

/**
 * Plugin for top menu block
 */
class Topmenu
{
    /**
     * Catalog category
     *
     * @var \Magento\Catalog\Helper\Category
     */
    protected $catalogCategory;

    /**
     * @var \Magento\Catalog\Model\ResourceModel\Category\StateDependentCollectionFactory
     */
    private $collectionFactory;

    /**
     * @var \Magento\Store\Model\StoreManagerInterface
     */
    private $storeManager;

    /**
     * @var \Magento\Catalog\Model\Layer\Resolver
     */
    private $layerResolver;

    /**
     * Initialize dependencies.
     *
     * @param \Magento\Catalog\Helper\Category $catalogCategory
     * @param \Magento\Catalog\Model\ResourceModel\Category\StateDependentCollectionFactory $categoryCollectionFactory
     * @param \Magento\Store\Model\StoreManagerInterface $storeManager
     * @param \Magento\Catalog\Model\Layer\Resolver $layerResolver
     */
    public function __construct(
        \Magento\Catalog\Helper\Category $catalogCategory,
        \Magento\Catalog\Model\ResourceModel\Category\StateDependentCollectionFactory $categoryCollectionFactory,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Catalog\Model\Layer\Resolver $layerResolver
    ) {
        $this->catalogCategory = $catalogCategory;
        $this->collectionFactory = $categoryCollectionFactory;
        $this->storeManager = $storeManager;
        $this->layerResolver = $layerResolver;
    }

    /**
     * Build category tree for menu block.
     *
     * @param \Magento\Theme\Block\Html\Topmenu $subject
     * @param string $outermostClass
     * @param string $childrenWrapClass
     * @param int $limit
     * @return void
     * @SuppressWarnings("PMD.UnusedFormalParameter")
     */
    public function beforeGetHtml(
        \Magento\Theme\Block\Html\Topmenu $subject,
        $outermostClass = '',
        $childrenWrapClass = '',
        $limit = 0
    ) {
        $rootId = $this->storeManager->getStore()->getRootCategoryId();
        $storeId = $this->storeManager->getStore()->getId();
        /** @var \Magento\Catalog\Model\ResourceModel\Category\Collection $collection */
        $collection = $this->getCategoryTree($storeId, $rootId);
        $currentCategory = $this->getCurrentCategory();
        $mapping = [$rootId => $subject->getMenu()];  // use nodes stack to avoid recursion
        foreach ($collection as $category) {
            $categoryParentId = $category->getParentId();
            if (!isset($mapping[$categoryParentId])) {
                $parentIds = $category->getParentIds();
                foreach ($parentIds as $parentId) {
                    if (isset($mapping[$parentId])) {
                        $categoryParentId = $parentId;
                    }
                }
            }

            /** @var Node $parentCategoryNode */
            $parentCategoryNode = $mapping[$categoryParentId];

            $categoryNode = new Node(
                $this->getCategoryAsArray(
                    $category,
                    $currentCategory,
                    $category->getParentId() == $categoryParentId
                ),
                'id',
                $parentCategoryNode->getTree(),
                $parentCategoryNode
            );
            $parentCategoryNode->addChild($categoryNode);

            $mapping[$category->getId()] = $categoryNode; //add node in stack
        }
    }

    /**
     * Add list of associated identities to the top menu block for caching purposes.
     *
     * @param \Magento\Theme\Block\Html\Topmenu $subject
     * @return void
     */
    public function beforeGetIdentities(\Magento\Theme\Block\Html\Topmenu $subject)
    {
        $subject->addIdentity(Category::CACHE_TAG);
        $rootId = $this->storeManager->getStore()->getRootCategoryId();
        $storeId = $this->storeManager->getStore()->getId();
        /** @var \Magento\Catalog\Model\ResourceModel\Category\Collection $collection */
        $collection = $this->getCategoryTree($storeId, $rootId);
        $mapping = [$rootId => $subject->getMenu()];  // use nodes stack to avoid recursion
        foreach ($collection as $category) {
            if (!isset($mapping[$category->getParentId()])) {
                continue;
            }
            $subject->addIdentity(Category::CACHE_TAG . '_' . $category->getId());
        }
    }

    /**
     * Get current Category from catalog layer
     *
     * @return \Magento\Catalog\Model\Category
     */
    private function getCurrentCategory()
    {
        $catalogLayer = $this->layerResolver->get();

        if (!$catalogLayer) {
            return null;
        }

        return $catalogLayer->getCurrentCategory();
    }

    /**
     * Convert category to array
     *
     * @param \Magento\Catalog\Model\Category $category
     * @param \Magento\Catalog\Model\Category $currentCategory
     * @param bool $isParentActive
     * @return array
     */
    private function getCategoryAsArray($category, $currentCategory, $isParentActive)
    {
        $categoryId = $category->getId();
        return [
            'name' => $category->getName(),
            'id' => 'category-node-' . $categoryId,
            'url' => $this->catalogCategory->getCategoryUrl($category),
            'has_active' => in_array((string)$categoryId, explode('/', (string)$currentCategory->getPath()), true),
            'is_active' => $categoryId == $currentCategory->getId(),
            'is_category' => true,
            'is_parent_active' => $isParentActive
        ];
    }

    /**
     * Get Category Tree
     *
     * @param int $storeId
     * @param int $rootId
     * @return \Magento\Catalog\Model\ResourceModel\Category\Collection
     * @throws \Magento\Framework\Exception\LocalizedException
     */
    protected function getCategoryTree($storeId, $rootId)
    {
        /** @var \Magento\Catalog\Model\ResourceModel\Category\Collection $collection */
        $collection = $this->collectionFactory->create();
        $collection->setStoreId($storeId);
        $collection->addAttributeToSelect('name');
        $collection->addFieldToFilter('path', ['like' => '1/' . $rootId . '/%']); //load only from store root
        $collection->addAttributeToFilter('include_in_menu', 1);
        $collection->addIsActiveFilter();
        $collection->addNavigationMaxDepthFilter();
        $collection->addUrlRewriteToResult();
        $collection->addOrder('level', Collection::SORT_ORDER_ASC);
        $collection->addOrder('position', Collection::SORT_ORDER_ASC);
        $collection->addOrder('parent_id', Collection::SORT_ORDER_ASC);
        $collection->addOrder('entity_id', Collection::SORT_ORDER_ASC);

        return $collection;
    }

    /**
     * Add active
     *
     * @param \Magento\Theme\Block\Html\Topmenu $subject
     * @param string[] $result
     * @return string[]
     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
     */
    public function afterGetCacheKeyInfo(\Magento\Theme\Block\Html\Topmenu $subject, array $result)
    {
        $activeCategory = $this->getCurrentCategory();
        if ($activeCategory) {
            $result[] = Category::CACHE_TAG . '_' . $activeCategory->getId();
        }

        return $result;
    }
}