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/user.dart';
import 'package:fcs/pages/main/model/base_model.dart';
import 'package:logging/logging.dart';

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

  List<User> customers = [];
  List<User> invitations = [];
  late StreamSubscription<QuerySnapshot>? customerListener;
  late StreamSubscription<QuerySnapshot>? invitationListener;

  @override
  void privilegeChanged() {
    super.privilegeChanged();
    _loadCustomer();
    _loadInvitations();
  }

  @override
  logout() async {
    if (customerListener != null) customerListener!.cancel();
    if (invitationListener != null) invitationListener!.cancel();
    customers = [];
    invitations = [];
  }

  Future<void> inviteUser(String userName, String phoneNumber) {
    return Services.instance.userService.inviteUser(userName, phoneNumber);
  }

  Future<void> deleteInvite(String phoneNumber) {
    return Services.instance.userService.deleteInvite(phoneNumber);
  }

  Future<void> acceptRequest(String userID) {
    return Services.instance.userService.acceptRequest(userID);
  }

  Future<void> _loadCustomer() async {
    if (user == null && !user!.hasCustomers()) return;

    try {
      if (customerListener != null) customerListener!.cancel();

      customerListener = FirebaseFirestore.instance
          .collection("/$user_collection")
          .where("is_sys_admin", isEqualTo: false)
          .orderBy("message_time", descending: true)
          .snapshots()
          .listen((QuerySnapshot snapshot) {
        customers.clear();
        customers = snapshot.docs.map((documentSnapshot) {
          var user = User.fromMap(
              documentSnapshot.data() as Map<String, dynamic>,
              documentSnapshot.id);
          return user;
        }).toList();
        notifyListeners();
      });
    } catch (e) {
      log.warning("error:$e");
    }
  }

  Future<void> _loadInvitations() async {
    if (user == null && !user!.hasCustomers()) return;

    try {
      if (invitationListener != null) invitationListener!.cancel();

      invitationListener = FirebaseFirestore.instance
          .collection("/$invitations_collection")
          .snapshots()
          .listen((QuerySnapshot snapshot) {
        invitations.clear();
        invitations = snapshot.docs.map((documentSnapshot) {
          var user = User.fromMap(
              documentSnapshot.data() as Map<String, dynamic>,
              documentSnapshot.id);
          return user;
        }).toList();
        notifyListeners();
      });
    } catch (e) {
      log.warning("error:$e");
    }
  }

  Future<User> getUser(String? id) async {
    String path = "/$user_collection";
    var snap = await FirebaseFirestore.instance.collection(path).doc(id).get();
    return User.fromMap(snap.data() as Map<String, dynamic>, snap.id);
  }

  Future<List<User>> getInvoiceUsers(String fcsShipmentID) async {
    List<User> users = [];
    try {
      var snaps = await FirebaseFirestore.instance
          .collection(
              "/$fcs_shipment_collection/$fcsShipmentID/$user_collection")
          .where("pending_invoice_carton_count", isGreaterThan: 0)
          .get(GetOptions(source: Source.server));
      users = snaps.docs.map((documentSnapshot) {
        var user = User.fromMap(documentSnapshot.data(), documentSnapshot.id);
        return user;
      }).toList();
    } catch (e) {
      log.warning("Error!! $e");
    }
    return users;
  }

  Future<void> enableUser(User user, bool enabled) {
    return Services.instance.userService.enableUser(user.id ?? "", enabled);
  }
}