add discount api

lib/pages/discount/model/discount_model.dart

@@ -1,56 +1,56 @@
+import 'dart:async';
+
+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:fcs/data/services/services.dart';
 import 'package:fcs/domain/entities/discount.dart';
 import 'package:fcs/pages/main/model/base_model.dart';
+import 'package:logging/logging.dart';
 
 class DiscountModel extends BaseModel {
-  List<Discount> get discounts {
-    List<Discount> discountList = [
-      Discount(
-        code: 'XMQY01',
-        customer: 'Ko Nyi',
-        amount: 5000,
-        status: 'Used',
-      ),
-      Discount(
-        code: 'XMQY02',
-        customer: 'Ko Aung Myo',
-        amount: 3000,
-        status: 'Avaliable',
-      ),
-      Discount(
-        code: 'XMQY03',
-        customer: 'Ko Zaw Thu',
-        amount: 2000,
-        status: 'Used',
-      ),
-      Discount(
-        code: 'XMQY04',
-        customer: 'Ko Myo Min',
-        amount: 3000,
-        status: 'Avaliable',
-      ),
-      Discount(
-        code: 'XMQY05',
-        customer: 'Ko Nyi',
-        amount: 3000,
-        status: 'Avaliable',
-      ),
-    ];
-    return discountList;
-  }
+  final log = Logger('DiscountModel');
 
-  // List<Discount> get discountByCustomer {
-  //   return invoices.where((e) => e.status == "Avaliable").toList()
-  //     ..sort((e1, e2) {
-  //       return e2.invoiceNumber.compareTo(e1.invoiceNumber);
-  //     });
-  // }
+  StreamSubscription<QuerySnapshot> listener;
+
+  List<Discount> discounts = [];
 
   void initUser(user) {
     super.initUser(user);
+    _load();
+  }
+
+  _load() {
+    if (listener != null) listener.cancel();
+    try {
+      listener = Firestore.instance
+          .collection("/discounts")
+          .orderBy("code", descending: false)
+          .snapshots()
+          .listen((snaps) {
+        discounts.clear();
+        snaps.documents.forEach((d) {
+          discounts.add(Discount.fromMap(d.data, d.documentID));
+        });
+        notifyListeners();
+      });
+    } catch (e) {
+      log.warning("error:$e");
+    }
   }
 
   @override
   logout() async {
-    // discounts = [];
+    discounts = [];
+  }
+
+  Future<void> addDiscount(Discount discount) async {
+    return Services.instance.commonService.createDiscount(discount);
+  }
+
+  Future<void> updateDiscount(Discount discount) async {
+    return Services.instance.commonService.updateDiscount(discount);
+  }
+
+  Future<void> deleteDiscount(Discount discount) async {
+    return Services.instance.commonService.deleteDiscount(discount.id);
   }
 }