feat: Enhance product support in Cart and OrderItem models

- Added new fields 'billing_cycle' and 'product_pricing_id' to Cart and OrderItem models.
- Updated product retrieval logic to support both new and legacy systems.
- Introduced relationships for Product and ProductPricings in Cart and OrderItem models.
- Created migration to add new fields to the carts and order_item tables.
- Updated frontend service index to handle new pricing structure and billing cycles.
- Improved UI components for better user experience in product selection and pricing display.
- Refactored action buttons in various views for consistency and improved styling.

app/Http/Controllers/frontend/CartController.php

@@ -14,7 +14,10 @@ use App\Models\InvoiceItem;
 use App\Models\ModuleHosting;
 use App\Models\ModuleVmware;
 use App\Models\Order;
+use App\Models\OrderItem;
 use App\Models\Os;
+use App\Models\Product;
+use App\Models\ProductPricings;
 use App\Models\VPS;
 use Exception;
 use Illuminate\Http\Request;
@@ -36,36 +39,85 @@ class CartController extends Controller
     public function addCart(Request $request)
     {
         $userId = customer()?->id;
-        $months = $request->input('months');
-        $productId = $request->product_id;
-        $typeId = $request->type_id;
 
         if (!$userId) {
             return back()->with('error', 'Bạn cần đăng nhập để thêm sản phẩm vào giỏ hàng.');
         }
 
-        // Validate input data
-        if (!$productId || !$typeId || !$months) {
-            return back()->with('error', 'Dữ liệu không hợp lệ.');
+        // Get request data
+        $productId = $request->product_id;
+        $typeId = $request->type_id; // Can be null for new Product system
+        $months = $request->input('months');
+        $billingCycle = $request->input('billing_cycle'); // New: billing cycle
+        $productPrice = $request->input('product_price'); // Price from form
+
+        // Validate basic input
+        if (!$productId) {
+            return back()->with('error', 'Sản phẩm không hợp lệ.');
         }
 
-        // Use updateOrCreate instead of delete + create for better performance
         try {
-            CartModel::updateOrCreate(
-                ['customer_id' => $userId], // Only one cart item per user
-                [
-                    'product_id' => $productId,
-                    'type_product' => $typeId,
-                    'months' => $months,
-                ]
-            );
+            // Check if this is new Product system or legacy (Hosting/VPS)
+            $product = Product::find($productId);
 
-            return redirect()->route('cart.index')->with('success', 'Sản phẩm đã được thêm vào giỏ hàng!');
+            if ($product) {
+                // NEW FLOW: Using Product table
+                $pricingId = null;
+                $finalPrice = $productPrice;
+
+                // Find the pricing based on billing_cycle
+                if ($billingCycle) {
+                    $pricing = ProductPricings::where('product_id', $productId)
+                        ->where('billing_cycle', $billingCycle)
+                        ->where('is_active', 1)
+                        ->first();
+
+                    if ($pricing) {
+                        $pricingId = $pricing->id;
+                        $finalPrice = $pricing->price_sale ?: $pricing->price;
+                    }
+                }
+
+                // Add to cart
+                CartModel::updateOrCreate(
+                    ['customer_id' => $userId],
+                    [
+                        'product_id' => $productId,
+                        'type_product' => null, // New system doesn't use type_product
+                        'months' => $months,
+                        'billing_cycle' => $billingCycle,
+                        'product_pricing_id' => $pricingId,
+                        'price' => $finalPrice,
+                        'quantity' => 1,
+                    ]
+                );
+
+                return redirect()->route('cart.index')->with('success', 'Sản phẩm đã được thêm vào giỏ hàng!');
+            } else {
+                // LEGACY FLOW: Using old Hosting/VPS system
+                if (!$typeId || !$months) {
+                    return back()->with('error', 'Dữ liệu không hợp lệ.');
+                }
+
+                CartModel::updateOrCreate(
+                    ['customer_id' => $userId],
+                    [
+                        'product_id' => $productId,
+                        'type_product' => $typeId,
+                        'months' => $months,
+                        'price' => $productPrice,
+                    ]
+                );
+
+                return redirect()->route('cart.index')->with('success', 'Sản phẩm đã được thêm vào giỏ hàng!');
+            }
         } catch (\Exception $e) {
             Log::error('Cart add error: ' . $e->getMessage(), [
                 'user_id' => $userId,
                 'product_id' => $productId,
-                'type_id' => $typeId
+                'type_id' => $typeId,
+                'billing_cycle' => $billingCycle ?? null,
+                'trace' => $e->getTraceAsString()
             ]);
             return back()->with('error', 'Có lỗi xảy ra khi thêm sản phẩm vào giỏ hàng.');
         }