add payment

lib/domain/entities/invoice.dart

@@ -4,6 +4,7 @@ import 'package:fcs/domain/entities/carton.dart';
 import 'package:fcs/domain/entities/custom_duty.dart';
 import 'package:fcs/domain/entities/discount.dart';
 import 'package:fcs/domain/entities/discount_by_weight.dart';
+import 'package:fcs/domain/entities/payment.dart';
 import 'package:fcs/domain/entities/payment_method.dart';
 import 'package:fcs/domain/entities/rate.dart';
 import 'package:fcs/domain/entities/shipment.dart';
@@ -28,6 +29,7 @@ class Invoice {
   List<Carton> cartons;
   List<CargoType> cargoTypes;
   List<Shipment> shipments;
+  List<Payment> payments;
   Discount discount;
   PaymentMethod paymentMethod;
   String invoiceURL;
@@ -70,6 +72,8 @@ class Invoice {
     return total;
   }
 
+  double get balance => (amount ?? 0) - (paidAmount ?? 0);
+
   double getNetAmount(Rate rate) {
     List<CargoType> cargoTypes = getCargoTypes(rate);
     var total = cargoTypes.fold(0.0, (p, c) => c.calAmount + p);
@@ -108,6 +112,7 @@ class Invoice {
       this.userName,
       this.phoneNumber,
       this.amount,
+      this.paidAmount,
       this.discount,
       this.status,
       this.customDuties,
@@ -118,6 +123,7 @@ class Invoice {
       this.fcsShipmentID,
       this.shipments,
       this.invoiceURL,
+      this.payments,
       this.paymentMethod});
 
   factory Invoice.fromMap(Map<String, dynamic> map, String docID) {
@@ -142,6 +148,8 @@ class Invoice {
         : null;
     var discountMap = map['discount'];
     var discount = Discount.fromMap(discountMap, discountMap['id']);
+    var paymentMaps = List<Map<String, dynamic>>.from(map['payments'] ?? []);
+    var payments = paymentMaps.map((e) => Payment.fromMap(e, e["id"])).toList();
     return Invoice(
       id: docID,
       invoiceNumber: map['invoice_number'],
@@ -150,6 +158,7 @@ class Invoice {
       fcsID: map['fcs_id'],
       phoneNumber: map['phone_number'],
       amount: map['amount'],
+      paidAmount: double.tryParse(map['paid_amount'].toString()) ?? 0,
       status: map['status'],
       cartons: cartons,
       cargoTypes: cargoTypes,
@@ -159,6 +168,7 @@ class Invoice {
       invoiceURL: map['invoice_url'],
       paymentMethod: paymentMethod,
       discount: discount,
+      payments: payments,
     );
   }