шаг 4 завершен

views/partials/category-tree.php

@@ -4,20 +4,54 @@ declare(strict_types=1);
 
 /** @var array<int, array<string, mixed>> $items */
 /** @var int $depth */
+/** @var string $currentSlug */
+
+if (!function_exists('category_tree_has_current')) {
+    /**
+     * @param array<string, mixed> $category
+     */
+    function category_tree_has_current(array $category, string $currentSlug): bool
+    {
+        if ($currentSlug === '') {
+            return false;
+        }
+
+        if (($category['slug'] ?? '') === $currentSlug) {
+            return true;
+        }
+
+        foreach (($category['children'] ?? []) as $child) {
+            if (category_tree_has_current($child, $currentSlug)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}
 ?>
 <ul class="category-list depth-<?= e((string) $depth) ?>">
     <?php foreach ($items as $category): ?>
-        <li>
-            <a href="/catalog/<?= e($category['slug']) ?>"><?= e($category['name']) ?></a>
-            <?php if (!empty($category['children'])): ?>
-                <?php
-                $previousItems = $items;
-                $items = $category['children'];
-                $depth++;
-                require __DIR__ . '/category-tree.php';
-                $depth--;
-                $items = $previousItems;
-                ?>
+        <?php $isCurrent = ($currentSlug ?? '') === $category['slug']; ?>
+        <?php $hasChildren = !empty($category['children']); ?>
+        <?php $shouldOpen = category_tree_has_current($category, $currentSlug ?? ''); ?>
+        <li class="<?= $isCurrent ? 'is-current' : '' ?>">
+            <?php if ($hasChildren): ?>
+                <details class="category-details" <?= $shouldOpen ? 'open' : '' ?>>
+                    <summary>
+                        <a class="<?= $isCurrent ? 'is-current-link' : '' ?>" href="/catalog/<?= e($category['slug']) ?>"><?= e($category['name']) ?></a>
+                    </summary>
+                    <?php
+                    $previousItems = $items;
+                    $items = $category['children'];
+                    $depth++;
+                    require __DIR__ . '/category-tree.php';
+                    $depth--;
+                    $items = $previousItems;
+                    ?>
+                </details>
+            <?php else: ?>
+                <a href="/catalog/<?= e($category['slug']) ?>"><?= e($category['name']) ?></a>
             <?php endif; ?>
         </li>
     <?php endforeach; ?>