fcs/lib/pages/discount/model/discount_model.dart

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 {
  final log = Logger('DiscountModel');

  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 = [];
  }

  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);
  }
}