update invoice page

lib/domain/entities/carton.dart

@@ -1,6 +1,7 @@
 import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:fcs/domain/entities/discount_by_weight.dart';
 import 'package:fcs/domain/entities/rate.dart';
+import 'package:fcs/domain/entities/shipment.dart';
 import 'package:fcs/domain/vo/shipment_status.dart';
 import 'package:fcs/domain/vo/delivery_address.dart';
 
@@ -9,6 +10,7 @@ import 'package.dart';
 
 class Carton {
   String id;
+  String shipmentID;
   String shipmentNumber;
   String senderFCSID;
   String senderName;
@@ -47,9 +49,9 @@ class Carton {
   List<String> packageIDs;
   List<Package> packages;
   List<CargoType> cargoTypes;
-  List<Carton> cartons;
 
   DeliveryAddress deliveryAddress;
+  Shipment shipment;
 
   int get amount => rate != null && weight != null ? rate * weight : 0;
 
@@ -73,6 +75,23 @@ class Carton {
     return (length * width * height) / volumetricRatio;
   }
 
+  /// getCargoTypeForCalWeight returns carton with shipment weight
+  List<CargoType> getCargoTypeForCalWeight(double volumetricRatio) {
+    // get shipment weight
+    double volume = (length ?? 0) * (width ?? 0) * (height ?? 0);
+    double sw = volume / volumetricRatio ?? 0;
+
+    // get actual weight
+    double aw = cargoTypes.fold(0.0, (p, c) => p + c.weight);
+    if (aw == 0 || sw == 0) return [];
+
+    cargoTypes.forEach((e) {
+      double calWeight = aw > sw ? e.weight : e.weight / aw * sw;
+      e.calWeight = calWeight;
+    });
+    return cargoTypes;
+  }
+
   /// calAmount returns total amount
   double calAmount(Rate rate) {
     // get shipment weight
@@ -101,6 +120,7 @@ class Carton {
 
   Carton(
       {this.id,
+      this.shipmentID,
       this.shipmentNumber,
       this.senderFCSID,
       this.senderName,
@@ -133,7 +153,6 @@ class Carton {
       this.cartonNumber,
       this.fcsShipmentID,
       this.fcsShipmentNumber,
-      this.cartons,
       this.packageIDs,
       this.mixCartonID,
       this.mixCartonNumber,
@@ -143,7 +162,6 @@ class Carton {
   Map<String, dynamic> toMap() {
     List _cargoTypes = cargoTypes.map((c) => c.toMap()).toList();
     List _packages = packages?.map((c) => c.toJson())?.toList();
-    List _cartons = cartons?.map((c) => c.toMap())?.toList() ?? [];
     return {
       "id": id,
       'fcs_shipment_id': fcsShipmentID,
@@ -155,8 +173,7 @@ class Carton {
       'height': height,
       'delivery_address': deliveryAddress.toMap(),
       'carton_type': cartonType,
-      'cartons': _cartons,
-      'mix_carton_id': mixCartonID
+      'mix_carton_id': mixCartonID,
     };
   }
 
@@ -171,6 +188,7 @@ class Carton {
     return Carton(
         id: docID,
         arrivedDate: _arrivedDate != null ? _arrivedDate.toDate() : null,
+        shipmentID: map['shipment_id'],
         shipmentNumber: map['shipment_number'],
         receiverNumber: map['receiver_number'],
         boxNumber: map['box_number'],