add rate service

lib/domain/entities/rate.dart

@@ -1,31 +1,45 @@
+import 'package:fcs/domain/entities/custom_duty.dart';
+import 'package:fcs/domain/entities/discount_by_weight.dart';
+
+import 'cargo_type.dart';
+
 class Rate {
-  String id;
-  String name;
-  String description;
-  String fromTime;
-  String toTime;
-  int price;
+  double deliveryFee;
+  double freeDeliveryWeight;
+  double volumetricRatio;
 
-  Rate(
-      {this.id,
-      this.name,
-      this.description,
-      this.fromTime,
-      this.toTime,
-      this.price,});
+  List<CargoType> cargoTypes;
+  List<CustomDuty> customDuties;
+  List<DiscountByWeight> discountByWeights;
 
-  factory Rate.fromMap(Map<String, dynamic> map, String id) {
+  CargoType get defaultCargoType => cargoTypes == null
+      ? null
+      : cargoTypes.firstWhere((e) => e.name == "General");
+
+  Rate({
+    this.deliveryFee,
+    this.freeDeliveryWeight,
+    this.volumetricRatio,
+  });
+
+  factory Rate.fromMap(Map<String, dynamic> map) {
     return Rate(
-        id: id,
-        name: map['name'],
-        description: map['description'],
-        fromTime: map['from_time'],
-        toTime: map['to_time'],
-        price: map['price'],);
+      deliveryFee: (map['delivery_fee'] ?? 0).toDouble(),
+      freeDeliveryWeight: (map['free_delivery_weight'] ?? 0).toDouble(),
+      volumetricRatio: (map['volumetric_ratio'] ?? 0).toDouble(),
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      "delivery_fee": deliveryFee,
+      'free_delivery_weight': freeDeliveryWeight,
+      'volumetric_ratio': volumetricRatio,
+    };
   }
 
   @override
   String toString() {
-    return 'Rate{id:$id, name:$name,description:$description,fromTime:$fromTime,toTime:$toTime}';
+    return 'Rate{deliveryFee:$deliveryFee,freeDeliveryWeight:$freeDeliveryWeight,volumetricRatio:$volumetricRatio}';
   }
 }