update cart

lib/features/cart/presentation/providers/cart_state.dart

@@ -11,16 +11,30 @@ import 'package:worker/features/products/domain/entities/product.dart';
 class CartItemData {
   final Product product;
   final double quantity;
+  final double quantityConverted; // Rounded-up quantity for actual billing
+  final int boxes; // Number of tiles/boxes needed
 
-  const CartItemData({required this.product, required this.quantity});
+  const CartItemData({
+    required this.product,
+    required this.quantity,
+    required this.quantityConverted,
+    required this.boxes,
+  });
 
-  /// Calculate line total
-  double get lineTotal => product.basePrice * quantity;
+  /// Calculate line total using CONVERTED quantity (important for accurate billing)
+  double get lineTotal => product.basePrice * quantityConverted;
 
-  CartItemData copyWith({Product? product, double? quantity}) {
+  CartItemData copyWith({
+    Product? product,
+    double? quantity,
+    double? quantityConverted,
+    int? boxes,
+  }) {
     return CartItemData(
       product: product ?? this.product,
       quantity: quantity ?? this.quantity,
+      quantityConverted: quantityConverted ?? this.quantityConverted,
+      boxes: boxes ?? this.boxes,
     );
   }
 }
@@ -30,6 +44,7 @@ class CartItemData {
 /// Represents the complete state of the shopping cart.
 class CartState {
   final List<CartItemData> items;
+  final Map<String, bool> selectedItems; // productId -> isSelected
   final String selectedWarehouse;
   final String? discountCode;
   final bool discountCodeApplied;
@@ -39,9 +54,12 @@ class CartState {
   final double memberDiscount;
   final double shippingFee;
   final double total;
+  final bool isLoading;
+  final String? errorMessage;
 
   const CartState({
     required this.items,
+    required this.selectedItems,
     required this.selectedWarehouse,
     this.discountCode,
     required this.discountCodeApplied,
@@ -51,11 +69,14 @@ class CartState {
     required this.memberDiscount,
     required this.shippingFee,
     required this.total,
+    this.isLoading = false,
+    this.errorMessage,
   });
 
   factory CartState.initial() {
     return const CartState(
       items: [],
+      selectedItems: {},
       selectedWarehouse: 'Kho Hà Nội - Nguyễn Trãi',
       discountCode: null,
       discountCodeApplied: false,
@@ -77,8 +98,30 @@ class CartState {
     return items.fold<double>(0.0, (sum, item) => sum + item.quantity);
   }
 
+  /// Get number of selected items
+  int get selectedCount {
+    return selectedItems.values.where((selected) => selected).length;
+  }
+
+  /// Check if all items are selected
+  bool get isAllSelected {
+    return items.isNotEmpty && selectedCount == items.length;
+  }
+
+  /// Get total of selected items only
+  double get selectedTotal {
+    double total = 0.0;
+    for (final item in items) {
+      if (selectedItems[item.product.productId] == true) {
+        total += item.lineTotal;
+      }
+    }
+    return total;
+  }
+
   CartState copyWith({
     List<CartItemData>? items,
+    Map<String, bool>? selectedItems,
     String? selectedWarehouse,
     String? discountCode,
     bool? discountCodeApplied,
@@ -88,9 +131,12 @@ class CartState {
     double? memberDiscount,
     double? shippingFee,
     double? total,
+    bool? isLoading,
+    String? errorMessage,
   }) {
     return CartState(
       items: items ?? this.items,
+      selectedItems: selectedItems ?? this.selectedItems,
       selectedWarehouse: selectedWarehouse ?? this.selectedWarehouse,
       discountCode: discountCode ?? this.discountCode,
       discountCodeApplied: discountCodeApplied ?? this.discountCodeApplied,
@@ -101,6 +147,8 @@ class CartState {
       memberDiscount: memberDiscount ?? this.memberDiscount,
       shippingFee: shippingFee ?? this.shippingFee,
       total: total ?? this.total,
+      isLoading: isLoading ?? this.isLoading,
+      errorMessage: errorMessage,
     );
   }
 }