#14 Category selection input implementation

Data/CategoryTreeNode.php

@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Loki\AdminComponents\Data;
+
+class CategoryTreeNode
+{
+    public function __construct(
+        public readonly int $id,
+        public readonly string $label,
+        public readonly bool $isActive,
+        public readonly int $level,
+        public readonly ?int $parentId = null,
+        public readonly array $parentIds = [],
+        public readonly array $children = [],
+    ) {
+    }
+
+    public function toUiArray(): array
+    {
+        $uiData = array_merge(
+            get_object_vars($this),
+            [
+                'hasChildren' => $this->children !== [],
+                'expanded' => $this->level === 0,
+                'hovered' => false,
+                'parentsPath' => null,
+            ]
+        );
+
+        unset($uiData['children']);
+
+        return $uiData;
+    }
+}

Form/Field/FieldType/CategorySelection.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Loki\AdminComponents\Form\Field\FieldType;
+
+use Loki\AdminComponents\Data\CategoryTreeNode;
+use Loki\AdminComponents\Service\CategorySelection\CategoryTreeBuilder;
+use Loki\AdminComponents\Service\CategorySelection\CategoryTreeRenderer;
+use Loki\AdminComponents\Form\Field\Field;
+use Loki\AdminComponents\Form\Field\FieldType\FieldTypeAbstract;
+use Magento\Framework\Serialize\SerializerInterface;
+
+class CategorySelection extends FieldTypeAbstract
+{
+    public function __construct(
+        private readonly CategoryTreeBuilder $categoryTreeBuilder,
+        private readonly CategoryTreeRenderer $categoryTreeRenderer,
+        private readonly SerializerInterface $serializer,
+    ) {
+    }
+
+    public function getTemplate(): string
+    {
+        return 'Loki_AdminComponents::form/field_type/category_selection.phtml';
+    }
+
+    public function getCategoryNodeJson(CategoryTreeNode $treeNode): string
+    {
+        return $this->serializer->serialize($treeNode->toUiArray());
+    }
+
+    /**
+     * @param CategoryTreeNode[] $categoryTreeNodes
+     */
+    public function getMaxCategoryLevel(array $categoryTreeNodes): int
+    {
+        return $this->categoryTreeBuilder->calculateMaxLevel($categoryTreeNodes);
+    }
+
+    public function renderMainScript(Field $field): string
+    {
+        return $this->categoryTreeRenderer->renderMainScript($field);
+    }
+
+    public function renderChildCategoryNode(CategoryTreeNode $categoryTreeNode, Field $field): string
+    {
+        return $this->categoryTreeRenderer->renderChildNode($categoryTreeNode, $field);
+    }
+
+    public function renderCategoriesBreadcrumb(): string
+    {
+        return $this->categoryTreeRenderer->renderBreadcrumb();
+    }
+
+    public function renderSearchInput(): string
+    {
+        return $this->categoryTreeRenderer->renderSearchInput();
+    }
+
+    public function getHoverSequenceJson(): string
+    {
+        $categoryTree = $this->getCategoryTree();
+        $hoverSequence = $this->categoryTreeBuilder->buildHoverSequence($categoryTree);
+
+        return $this->serializer->serialize($hoverSequence);
+    }
+
+    /**
+     * @return CategoryTreeNode[]
+     */
+    public function getCategoryTree(int $storeId = 0, ?string $filter = null): array
+    {
+        return $this->categoryTreeBuilder->build($storeId, $filter);
+    }
+}

Model/CategorySelection/CategoryTreeCacheKeyGenerator.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Loki\AdminComponents\Model\CategorySelection;
+
+use Magento\Backend\Model\Auth\Session;
+
+class CategoryTreeCacheKeyGenerator
+{
+    public const CACHE_TAG_PREFIX = 'loki_admin_components_form_category_tree';
+
+    public function __construct(
+        private readonly Session $authSession,
+    ) {
+    }
+
+    public function generate(int $storeId, ?string $filter): string
+    {
+        $parts = [
+            self::CACHE_TAG_PREFIX,
+            (string) $storeId,
+            $this->getUserRole(),
+            $filter ?? '',
+        ];
+
+        return implode('_', array_filter($parts));
+    }
+
+    private function getUserRole(): string
+    {
+        $user = $this->authSession->getUser();
+
+        return (string)$user?->getAclRole();
+    }
+}

Service/CategorySelection/CategoryFilterService.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Loki\AdminComponents\Service\CategorySelection;
+
+use Magento\Catalog\Model\Category;
+use Magento\Catalog\Model\ResourceModel\Category\Collection;
+use Magento\Catalog\Model\ResourceModel\Category\CollectionFactory;
+use Magento\Framework\DB\Helper as DbHelper;
+
+class CategoryFilterService
+{
+    public function __construct(
+        private readonly CollectionFactory $categoryCollectionFactory,
+        private readonly DbHelper $dbHelper,
+    ) {
+    }
+
+    /**
+     * @return int[]
+     */
+    public function getVisibleCategoryIds(int $storeId, ?string $filter): array
+    {
+        $collection = $this->createFilteredCollection($storeId, $filter);
+
+        return $this->extractCategoryIdsWithAncestors($collection);
+    }
+
+    private function createFilteredCollection(int $storeId, ?string $filter): Collection
+    {
+        $collection = $this->categoryCollectionFactory->create();
+        $collection->addAttributeToSelect('path')
+            ->addAttributeToFilter('entity_id', ['neq' => Category::TREE_ROOT_ID])
+            ->setStoreId($storeId);
+
+        if (!empty($filter)) {
+            $collection->addAttributeToFilter(
+                'name',
+                ['like' => $this->dbHelper->addLikeEscape($filter, ['position' => 'any'])]
+            );
+        }
+
+        return $collection;
+    }
+
+    /**
+     * @return int[]
+     */
+    private function extractCategoryIdsWithAncestors(Collection $collection): array
+    {
+        $categoryIds = [];
+
+        foreach ($collection as $category) {
+            $path = $category->getPath() ?? '';
+            foreach (explode('/', $path) as $ancestorId) {
+                $categoryIds[(int) $ancestorId] = true;
+            }
+        }
+
+        return array_keys($categoryIds);
+    }
+}