parser logic added

lib/models/line_item.dart

@@ -8,20 +8,27 @@ class LineItem {
     required this.price,
     this.quantity,
     this.unitPrice,
+    this.discount = 0,
   });
 
   final String id;
   final String name;
+
+  /// Line total after any discount.
   final double price;
   final int? quantity;
   final double? unitPrice;
 
+  /// Negative amount when a discount was folded into [price].
+  final double discount;
+
   LineItem copyWith({
     String? id,
     String? name,
     double? price,
     int? quantity,
     double? unitPrice,
+    double? discount,
     bool clearQuantity = false,
   }) {
     return LineItem(
@@ -30,6 +37,7 @@ class LineItem {
       price: price ?? this.price,
       quantity: clearQuantity ? null : (quantity ?? this.quantity),
       unitPrice: clearQuantity ? null : (unitPrice ?? this.unitPrice),
+      discount: discount ?? this.discount,
     );
   }
 }

lib/models/shopping_list.dart

@@ -0,0 +1,57 @@
+/// A named list of things to buy.
+library;
+
+class ShoppingList {
+  const ShoppingList({
+    required this.id,
+    required this.name,
+    required this.itemCount,
+    required this.checkedCount,
+    required this.updatedAt,
+  });
+
+  final int id;
+  final String name;
+  final int itemCount;
+  final int checkedCount;
+  final DateTime updatedAt;
+
+  factory ShoppingList.fromMap(Map<String, Object?> map) {
+    return ShoppingList(
+      id: map['id']! as int,
+      name: map['name']! as String,
+      itemCount: (map['item_count'] as num?)?.toInt() ?? 0,
+      checkedCount: (map['checked_count'] as num?)?.toInt() ?? 0,
+      updatedAt: DateTime.parse(map['updated_at']! as String),
+    );
+  }
+}
+
+class ShoppingListItem {
+  const ShoppingListItem({
+    required this.id,
+    required this.listId,
+    required this.name,
+    required this.checked,
+    required this.sortOrder,
+    this.productId,
+  });
+
+  final int id;
+  final int listId;
+  final String name;
+  final bool checked;
+  final int sortOrder;
+  final int? productId;
+
+  factory ShoppingListItem.fromMap(Map<String, Object?> map) {
+    return ShoppingListItem(
+      id: map['id']! as int,
+      listId: map['list_id']! as int,
+      name: map['name']! as String,
+      checked: (map['checked'] as int? ?? 0) == 1,
+      sortOrder: (map['sort_order'] as num?)?.toInt() ?? 0,
+      productId: map['product_id'] as int?,
+    );
+  }
+}