fix errors

lib/domain/constants.dart

@@ -13,6 +13,7 @@ const custom_duties_collection = "custom_duties";
 const discounts_by_weights_collection = "discounts_by_weight";
 const shipments_collection = "shipments";
 const cartons_collection = "cartons";
+const discounts_collection = "discounts";
 
 // docs
 const setting_doc_id = "setting";

lib/domain/entities/cargo_type.dart

@@ -9,6 +9,9 @@ class CargoType {
   int shipmentWeight;
   double amount;
 
+  double calRate;
+  double calWeight;
+
   factory CargoType.fromMap(Map<String, dynamic> map, String id) {
     return CargoType(
       id: id,

lib/domain/entities/carton.dart

@@ -43,10 +43,9 @@ class Carton {
   String remark;
   DateTime arrivedDate;
   String cartonNumber;
+
   List<String> packageIDs;
-
   List<Package> packages;
-
   List<CargoType> cargoTypes;
   List<Carton> cartons;
 
@@ -193,4 +192,10 @@ class Carton {
         deliveryAddress: _da,
         cargoTypes: cargoTypes);
   }
+
+  @override
+  bool operator ==(Object other) => other is Carton && other.id == id;
+
+  @override
+  int get hashCode => id.hashCode;
 }

lib/domain/entities/custom_duty.dart

@@ -22,4 +22,10 @@ class CustomDuty {
       'fee': fee,
     };
   }
+
+  @override
+  bool operator ==(Object other) => other is CustomDuty && other.id == id;
+
+  @override
+  int get hashCode => id.hashCode;
 }

lib/domain/entities/invoice.dart

@@ -1,3 +1,10 @@
+import 'package:fcs/domain/entities/cargo_type.dart';
+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/rate.dart';
+
 import 'package.dart';
 import 'receipt.dart';
 
@@ -8,13 +15,89 @@ class Invoice {
   String customerName;
   String customerPhoneNumber;
   double amount;
-  String discount;
   String status;
   String paymentAttachment;
+  double handlingFee;
+  double deliveryFee;
+  double paidAmount;
 
   List<Package> packages;
   List<Receipt> receipts;
   List<String> receiptPhotos;
+  List<CustomDuty> customDuties;
+  List<Carton> cartons;
+  Discount discount;
+
+  List<CargoType> getCargoTypes(Rate rate) {
+    List<CargoType> cargoTypes = [];
+    double actualWeight = 0;
+    double shipmentWeight = 0;
+    cartons.forEach((c) {
+      c.cargoTypes.forEach((tc) {
+        if (cargoTypes.contains(tc)) {
+          CargoType existing = cargoTypes.firstWhere((wc) => wc.id == tc.id);
+          existing.weight += tc.weight;
+        } else {
+          cargoTypes.add(tc);
+        }
+        actualWeight += tc.weight;
+      });
+      double volume = (c.length ?? 0) * (c.width ?? 0) * (c.height ?? 0);
+      double sw = volume / rate.volumetricRatio ?? 0;
+      shipmentWeight += sw;
+    });
+
+    DiscountByWeight discountByWeight = rate.getDiscountByWeight(
+        shipmentWeight > actualWeight ? shipmentWeight : actualWeight);
+
+    cargoTypes.forEach((e) {
+      print(actualWeight > shipmentWeight);
+      double cargoWeight = actualWeight > shipmentWeight
+          ? e.weight
+          : e.weight / actualWeight * shipmentWeight;
+      double r =
+          e.rate - (discountByWeight != null ? discountByWeight.discount : 0);
+      double amount = cargoWeight * r;
+      e.calRate = r;
+      e.calWeight = cargoWeight;
+      e.amount = amount;
+    });
+    return cargoTypes;
+  }
+
+  double getTotal(Rate rate) {
+    List<CargoType> cargoTypes = getCargoTypes(rate);
+    var total = cargoTypes.fold(0.0, (p, c) => c.amount + p);
+    return total;
+  }
+
+  double getNetAmount(Rate rate) {
+    List<CargoType> cargoTypes = getCargoTypes(rate);
+    var total = cargoTypes.fold(0.0, (p, c) => c.amount + p);
+    total += getCustomFee();
+    total += getDeliveryFee();
+    total += getHandlingFee();
+    total -= getDiscount();
+    return total;
+  }
+
+  double getTotalBalance(Rate rate) {
+    return getNetAmount(rate) - (paidAmount ?? 0);
+  }
+
+  double getCustomFee() {
+    return customDuties == null ? 0 : customDuties.fold(0, (p, d) => p + d.fee);
+  }
+
+  double getHandlingFee() {
+    return handlingFee == null ? 0 : handlingFee;
+  }
+
+  double getDeliveryFee() {
+    return deliveryFee == null ? 0 : deliveryFee;
+  }
+
+  double getDiscount() => discount == null ? 0 : discount.amount;
 
   Invoice(
       {this.id,
@@ -28,6 +111,9 @@ class Invoice {
       this.paymentAttachment,
       this.packages,
       this.receiptPhotos,
+      this.customDuties,
+      this.cartons,
+      this.handlingFee,
       this.receipts});
 
   double get getAmount => packages.fold(0, (p, e) => (e.rate * e.weight) + p);

lib/domain/entities/shipment.dart

@@ -13,6 +13,7 @@ class Shipment {
   String pickupTimeEnd;
 
   String userName;
+  String userID;
   String phoneNumber;
   int numberOfPackage;
   int weight;
@@ -35,6 +36,7 @@ class Shipment {
       {this.id,
       this.shipmentNumber,
       this.shipmentType,
+      this.userID,
       this.userName,
       this.phoneNumber,
       this.pickupTimeStart,
@@ -75,6 +77,7 @@ class Shipment {
     return Shipment(
         id: id,
         userName: map['user_name'],
+        userID: map['user_id'],
         shipmentNumber: map['shipment_number'],
         phoneNumber: map['phone_number'],
         pickupDate: pd == null ? null : pd.toDate(),
@@ -97,6 +100,7 @@ class Shipment {
 
     return {
       "id": id,
+      'user_id': userID,
       'cartons': _boxes,
       'shipment_type': shipmentType,
       'pickup_address': pickupAddress.toMap(),