OrderController

class OrderController extends Controller
{
    public function store(Request $request)
    {
        $request->validate([
            'user_id' => 'required|exists:users,id',
            'items' => 'required|array',
            'items.*.product_id' => 'required|exists:products,id',
            'items.*.quantity' => 'required|integer|min:1'
        ]);

        $total = 0;
        foreach ($request->items as $item) {
            $product = Product::find($item['product_id']);
            $total += $product->price * $item['quantity'];

            if ($product->stock < $item['quantity']) {
                return back()->with('error', 'Not enough stock for ' . $product->name);
            }
        }

        $order = Order::create([
            'user_id' => $request->user_id,
            'total' => $total,
            'status' => 'pending'
        ]);

        foreach ($request->items as $item) {
            $order->items()->create([
                'product_id' => $item['product_id'],
                'quantity' => $item['quantity'],
                'price' => Product::find($item['product_id'])->price
            ]);

            Product::where('id', $item['product_id'])->decrement('stock', $item['quantity']);
        }

        Mail::to($order->user->email)->send(new OrderConfirmation($order));

        return redirect()->route('orders.show', $order);
    }
}