fcs/lib/pages/shipment/model/shipment_model.dart

import 'dart:async';

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:fcs/data/services/services.dart';
import 'package:fcs/domain/constants.dart';
import 'package:fcs/domain/entities/shipment.dart';
import 'package:fcs/domain/vo/message.dart';
import 'package:fcs/helpers/paginator.dart';
import 'package:fcs/pages/main/model/base_model.dart';
import 'package:logging/logging.dart';

class ShipmentModel extends BaseModel {
  final log = Logger('ShipmentModel');

  StreamSubscription<QuerySnapshot> listener;

  List<Shipment> get shipments => _menuSelectedIndex == 1
      ? _shipments
      : List<Shipment>.from(_delivered.values);

  List<Shipment> _shipments = [];

  Paginator _delivered;
  bool isLoading = false;
  int _menuSelectedIndex = 1;

  set menuSelectedIndex(int index) {
    _menuSelectedIndex = index;
    notifyListeners();
  }

  get menuSelectedIndex => _menuSelectedIndex;

  initData(bool forCustomer) {
    logout();
    _menuSelectedIndex = 1;
    _loadShipments(forCustomer);
    _delivered = _getDeliveredExample(forCustomer);
    _delivered.load();
  }

  @override
  logout() async {
    if (_delivered != null) _delivered.close();
    if (listener != null) await listener.cancel();
    _shipments = [];
  }

  Future<void> loadMore({bool isCustomer}) async {
    if (menuSelectedIndex == 1)
      return; // when delivered menu is not selected return
    if (_delivered.ended) return;
    isLoading = true;
    notifyListeners();
    await _delivered.load(onFinished: () {
      isLoading = false;
      notifyListeners();
    });
  }

  Future<void> refresh({bool isCustomer}) async {
    if (menuSelectedIndex == 1)
      return; // when delivered menu is not selected return
    await _delivered.refresh(onFinished: () {
      notifyListeners();
    });
  }

  Paginator _getDelivered(bool isCustomer) {
    if (!isCustomer) {
      if (user == null ||
          !((user.hasPackages() ||
              user.hasReceiving() ||
              user.hasProcessing()))) throw "No privilege";
    }
    var pageQuery = Firestore.instance
        .collection("/$packages_collection")
        .where("is_delivered", isEqualTo: true)
        .where("is_deleted", isEqualTo: false);
    if (isCustomer) {
      pageQuery = pageQuery.where("user_id", isEqualTo: user.id);
    }
    pageQuery = pageQuery.orderBy("current_status_date", descending: true);
    var paginator = new Paginator(pageQuery, rowPerLoad: 20, toObj: (data, id) {
      return Shipment.fromMap(data, id);
    });
    return paginator;
  }

  int count = 0;
  Paginator _getDeliveredExample(bool onlyFcs) {
    count = 1;
    var pageQuery = Firestore.instance
        .collection(
            "/users/8OTfsbVvsUOn1SLxy1OrKk7Y_yNKkVoGalPcIlcHnAY/messages")
        .orderBy("date", descending: true);
    var paginator = new Paginator(pageQuery, rowPerLoad: 20, toObj: (data, id) {
      var m = Message.fromMap(data, id);
      return Shipment(
        id: m.id,
        shipmentNumber: m.message,
        currentStatus: m.senderName,
        pickupDate: m.date,
      );
    });
    return paginator;
  }

  Future<void> _loadShipments(bool forCustomer) async {
    if (user == null) return;
    if (!forCustomer && !user.hasShipment()) return;
    String path = "/$shipments_collection";
    if (listener != null) listener.cancel();
    _shipments = [];

    try {
      var q = Firestore.instance
          .collection("$path")
          .where("is_delivered", isEqualTo: false)
          .where("is_deleted", isEqualTo: false);

      if (forCustomer) {
        q = q.where("user_id", isEqualTo: user.id);
      }

      listener = q.snapshots().listen((QuerySnapshot snapshot) {
        _shipments.clear();
        _shipments = snapshot.documents.map((documentSnapshot) {
          var s = Shipment.fromMap(
              documentSnapshot.data, documentSnapshot.documentID);
          return s;
        }).toList();
        notifyListeners();
      });
    } catch (e) {
      log.warning("Error!! $e");
    }
  }

  List<String> shipmentTypes = [
    shipment_local_pickup,
    shipment_courier_pickup,
    shipment_local_dropoff,
    shipment_courier_dropoff
  ];

  void initUser(user) {
    super.initUser(user);
  }

  Future<void> createShipment(Shipment shipment) {
    return Services.instance.shipmentService.createShipment(shipment);
  }

  Future<void> updateShipment(Shipment shipment) {
    return Services.instance.shipmentService.updateShipment(shipment);
  }
}