wip

app/Http/Controllers/Api/V1/Favorite/FavoriteController.php

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+<?php
+
+namespace App\Http\Controllers\Api\V1\Favorite;
+
+use App\Http\Controllers\Api\V1\Favorite\Requests\FavoriteStoreRequest;
+use App\Http\Controllers\Api\V1\Favorite\Resources\FavoriteResource;
+use App\Http\Controllers\Controller;
+use Illuminate\Http\JsonResponse;
+
+class FavoriteController extends Controller
+{
+    /**
+     * (*) User's favorite products (index)
+     */
+    public function index(): JsonResponse
+    {
+        return response()->rest(
+            FavoriteResource::collection(
+                auth()->user()->favorites()->with(['product' => ['media', 'brand']])->get()
+            )
+        );
+    }
+
+    /**
+     * (*) Store resource
+     */
+    public function store(FavoriteStoreRequest $request): JsonResponse
+    {
+        $data = auth()->user()->favorites()->where('product_id', $request->product_id)->first();
+
+        $status = $data
+                    ? $data->delete()
+                    : auth()->user()->favorites()->create([
+                        'user_id' => auth()->id(),
+                        'product_id' => $request->product_id,
+                    ]);
+
+        return response()->rest(
+            message: is_bool($status) ? 'Removed' : 'Added'
+        );
+    }
+}

app/Http/Controllers/Api/V1/Favorite/Requests/FavoriteStoreRequest.php

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+<?php
+
+namespace App\Http\Controllers\Api\V1\Favorite\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class FavoriteStoreRequest extends FormRequest
+{
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, mixed>
+     */
+    public function rules(): array
+    {
+        return [
+            'product_id' => ['required', 'integer', 'exists:products,id'],
+        ];
+    }
+}

app/Http/Controllers/Api/V1/Favorite/Resources/FavoriteResource.php

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+<?php
+
+namespace App\Http\Controllers\Api\V1\Favorite\Resources;
+
+use App\Http\Controllers\Api\V1\Product\Resources\ProductResource;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+class FavoriteResource extends JsonResource
+{
+    /**
+     * Transform the resource into an array.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return array|\Illuminate\Contracts\Support\Arrayable|\JsonSerializable
+     */
+    public function toArray($request): array
+    {
+        return [
+            'created_at' => $this->created_at,
+            'product' => new ProductResource($this->whenLoaded('product')),
+        ];
+    }
+}