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app/Http/Controllers/Api/V1/CartController.php

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+<?php
+
+namespace App\Http\Controllers\Api\V1;
+
+use App\Http\Controllers\Api\V1\Product\Resources\ProductResource;
+use App\Http\Controllers\Controller;
+use App\Http\Requests\Api\V1\Cart\CartRemoveRequest;
+use App\Http\Requests\Api\V1\Cart\CartStoreRequest;
+use Illuminate\Http\JsonResponse;
+
+class CartController extends Controller
+{
+    /**
+     * (*) Users carts (index)
+     */
+    public function index(): JsonResponse
+    {
+        $cartItems = auth()->user()->carts()
+            ->with(['product' => ['media', 'brand']])
+            ->orderBy('cart_items.id', 'desc')
+            ->get()
+            ->each(function ($cartItem) {
+                if ($cartItem->product->stock < $cartItem->product_quantity) {
+                    if ($cartItem->product->stock >= 1) {
+                        $cartItem->update([
+                            'product_quantity' => $cartItem->product->stock,
+                        ]);
+                    } else {
+                        $cartItem->delete();
+                    }
+                }
+            });
+
+        return response()->rest(
+            $cartItems->map(fn ($cartItem) => [
+                'id' => $cartItem->id,
+                'user_id' => $cartItem->user_id,
+                'product_id' => $cartItem->product_id,
+                'product_quantity' => $cartItem->product_quantity,
+                'created_at' => $cartItem->created_at,
+                'updated_at' => $cartItem->updated_at,
+                'product' => new ProductResource($cartItem->product),
+            ])
+        );
+    }
+
+    /**
+     * (*) Store new cart (store)
+     */
+    public function store(CartStoreRequest $request): JsonResponse
+    {
+        auth()->user()->carts()->updateOrInsert(
+            ['user_id' => auth()->id(), 'product_id' => $request->product_id],
+            ['product_quantity' => $request->product_quantity]
+        );
+
+        return response()->rest(message: 'Cart item added or updated successfully', code: 201);
+    }
+
+    /**
+     * (*) Remove item from cart (patch)
+     */
+    public function remove(CartRemoveRequest $request): JsonResponse
+    {
+        auth()->user()->carts()->where('product_id', $request->product_id)->delete();
+
+        return response()->rest(message: 'Cart item removed successfully', code: 200);
+    }
+
+    /**
+     * (*) Delete all user's carts (delete)
+     */
+    public function destroy(): JsonResponse
+    {
+        auth()->user()->carts()->delete();
+
+        return response()->rest(message: "All user's carts deleted successfully", code: 200);
+    }
+}