feat: update

lib/presentation/split_bill/pages/split_bill_page.dart

@@ -39,6 +39,7 @@ class _SplitBillPageState extends State<SplitBillPage> {
   // Per Amount Split Data
   TextEditingController amountController = TextEditingController();
   int splitAmount = 0;
+  int remainingAmount = 0;
 
   List<OrderItem> getOrderItemPending() =>
       widget.order.orderItems
@@ -46,9 +47,24 @@ class _SplitBillPageState extends State<SplitBillPage> {
           .toList() ??
       [];
 
+  init() {
+    setState(() {
+      remainingAmount =
+          (widget.order.totalAmount ?? 0) - (widget.order.totalPaid ?? 0);
+      selectedSplitType = widget.order.splitType == 'AMOUNT' ? 1 : 0;
+    });
+  }
+
+  @override
+  void initState() {
+    init();
+    super.initState();
+  }
+
   @override
   void dispose() {
     amountController.dispose();
+
     super.dispose();
   }
 
@@ -210,13 +226,7 @@ class _SplitBillPageState extends State<SplitBillPage> {
                     SizedBox(height: 24),
 
                     // Split Type Selection
-                    Row(
-                      children: [
-                        _buildSplitTypeButton('Per Produk', 0),
-                        SizedBox(width: 16),
-                        _buildSplitTypeButton('Per Jumlah', 1),
-                      ],
-                    ),
+                    _buildRowButtonSplit(),
 
                     SizedBox(height: 32),
 
@@ -263,6 +273,23 @@ class _SplitBillPageState extends State<SplitBillPage> {
     );
   }
 
+  Widget _buildRowButtonSplit() {
+    switch (widget.order.splitType) {
+      case 'AMOUNT':
+        return _buildSplitTypeButton('Per Jumlah', 1);
+      case 'ITEM':
+        return _buildSplitTypeButton('Per Produk', 0);
+      default:
+        return Row(
+          children: [
+            _buildSplitTypeButton('Per Produk', 0),
+            SizedBox(width: 16),
+            _buildSplitTypeButton('Per Jumlah', 1),
+          ],
+        );
+    }
+  }
+
   Widget _buildCustomer(BuildContext context) {
     return Container(
       padding: EdgeInsets.all(16),
@@ -681,7 +708,7 @@ class _SplitBillPageState extends State<SplitBillPage> {
                         ),
                       ),
                       Text(
-                        'Rp ${_formatCurrency((widget.order.totalAmount ?? 0) - splitAmount)}',
+                        'Rp ${_formatCurrency((remainingAmount) - splitAmount)}',
                         style: TextStyle(
                           fontSize: 14,
                           color: AppColorSplitBill.textSecondary,
@@ -797,7 +824,8 @@ class _SplitBillPageState extends State<SplitBillPage> {
       }
     } else {
       // Per Amount Split
-      int totalAmount = widget.order.totalAmount ?? 0;
+      int totalAmount =
+          (widget.order.totalAmount ?? 0) - (widget.order.totalPaid ?? 0);
 
       if (splitAmount > 0 && splitAmount <= totalAmount) {
         // Create split order object with the specified amount