initial commit

backend/app/Http/Controllers/ProductController.php

@@ -0,0 +1,100 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Http\Requests\ProductIndexRequest;
+use App\Http\Resources\ProductResource;
+use App\Models\Category;
+use App\Models\Product;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Support\Collection;
+use Illuminate\Http\Resources\Json\AnonymousResourceCollection;
+
+class ProductController extends Controller
+{
+    public function index(ProductIndexRequest $request): AnonymousResourceCollection
+    {
+        $query = Product::query()
+            ->with(['category:id,name,slug', 'brand:id,name,slug'])
+            ->active()
+            ->whereNotNull('published_at')
+            ->orderByDesc('published_at')
+            ->orderByDesc('id');
+
+        $this->applySearchFilter($query, (string) ($request->validated('q') ?? ''));
+        $this->applyCategoryFilter($query, $request->validated('category'));
+
+        $paginator = $query->paginate(24)->appends($request->query());
+
+        return ProductResource::collection($paginator);
+    }
+
+    private function applySearchFilter(Builder $query, string $search): void
+    {
+        $search = trim($search);
+
+        if ($search !== '') {
+            $query->where(function (Builder $builder) use ($search): void {
+                $builder
+                    ->where('name', 'like', "%{$search}%")
+                    ->orWhere('description', 'like', "%{$search}%")
+                    ->orWhere('sku', 'like', "%{$search}%");
+            });
+        }
+    }
+
+    private function applyCategoryFilter(Builder $query, mixed $categorySlug): void
+    {
+        if (is_string($categorySlug) && $categorySlug !== '') {
+            $category = Category::query()
+                ->where('slug', $categorySlug)
+                ->first();
+
+            if (! $category instanceof Category) {
+                return;
+            }
+
+            $query->whereIn('category_id', $this->collectDescendantCategoryIds($category->id));
+        }
+    }
+
+    /**
+     * @return list<int>
+     */
+    private function collectDescendantCategoryIds(int $rootCategoryId): array
+    {
+        /** @var Collection<int, Category> $categories */
+        $categories = Category::query()
+            ->select(['id', 'parent_id'])
+            ->get();
+
+        $byParent = [];
+
+        foreach ($categories as $category) {
+            if ($category->parent_id === null) {
+                continue;
+            }
+
+            $byParent[$category->parent_id][] = (int) $category->id;
+        }
+
+        $stack = [$rootCategoryId];
+        $seen = [];
+
+        while ($stack !== []) {
+            $categoryId = array_pop($stack);
+
+            if ($categoryId === null || isset($seen[$categoryId])) {
+                continue;
+            }
+
+            $seen[$categoryId] = true;
+
+            foreach ($byParent[$categoryId] ?? [] as $childId) {
+                $stack[] = $childId;
+            }
+        }
+
+        return array_map('intval', array_keys($seen));
+    }
+}