flutter_shuqi/lib/app/user_manager.dart

import 'dart:convert';

import 'package:shuqi/model/user_model.dart';
import 'package:shuqi/utility/event_bus.dart';
import 'package:shuqi/model/constant.dart';

const String EventUserLogin = 'EventUserLogin';
const String EventUserLogout = 'EventUserLogout';

class UserManager {
  static UserManager instance = UserManager();

  UserModel? user;
  static UserModel? get currentUser {
    return UserManager.instance.user;
  }

  logout() {
    this.user = null;
    preferences.remove('user');
    eventBus.emit(EventUserLogout);
  }

  login(Map<String, dynamic> userJson) {
    var user = UserModel.fromJson(userJson);
    this.user = user;
    saveUser();

    eventBus.emit(EventUserLogin);
  }

  bool get isLogin {
    return user != null;
  }

  loadUserFromLocal() {
    String? userJson = preferences.getString('user');
    if (userJson != null) {
      user = UserModel.fromJson(json.decode(userJson));
    }
  }

  void saveUser() async {
    var data = json.encode(user);
    preferences.setString('user', data);
  }
}