E2EEChat/lib/common/global.dart

// 提供五套可选主题色
import 'dart:convert';

import 'package:dio/dio.dart';
import 'package:e2ee_chat/common/api.dart';
import 'package:e2ee_chat/model/profile.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:shared_preferences/shared_preferences.dart';

import '../presenter/login.dart';

const _themes = <MaterialColor>[
  Colors.blue,
  Colors.cyan,
  Colors.teal,
  Colors.green,
  Colors.red,
];

void debug(Object? o) {
  if (!Global.isRelease) {
    print(o);
  }
}

class Global {
  static GlobalKey<NavigatorState> navigatorKey = GlobalKey();

  static final Image defaultAvatar = Image.asset(
    "images/avatar.png",
    width: 80,
  );

  static final int profileId = 1;
  static Profile profile = Profile();

  // 可选的主题列表
  static List<MaterialColor> get themes => _themes;

  // 是否为release版
  static bool get isRelease => bool.fromEnvironment("dart.vm.product");

  static final String emptyToken = "token";

  static get locales => [
    const Locale('zh'), // 中文简体
    const Locale('en'), // 美国英语
    //其它Locales
  ];

  static Future<bool> checkPermission() async {
    bool status = await Permission.storage.isGranted;
    return status ? true : await Permission.storage.request().isGranted;
  }

  static listenIsLogin() async {
    while (true) {
      if (!profile.isLogin && (profile.isLogout || !await LoginPresenter().login())) {
        debug("offline detected! navigate to login route");
        await Global.navigatorKey.currentState?.pushNamed("login");
      }
      await Future.delayed(Duration(seconds: 1));
    }
  }

  //初始化全局信息，会在APP启动时执行
  static Future<void> init() async {
    debug('Init begin');

    bool status = await checkPermission();
    assert(status, "permission error");

    final prefs = await SharedPreferences.getInstance();
    String? json = prefs.getString("profile");
    profile = json!=null ? Profile.fromJson(jsonDecode(json)) : Profile();
    profile.isLogin = false;
    debug('Init profile: username: ${profile.username}, isLogout: ${profile.isLogout}');


    await Api.init();

    listenIsLogin();

    /*
    debug('Init login');
    try {
      await UserModel().login(); // must await, or can not catch error
    } on DioError catch(e) {
      debug('Init login failed');
    }
     */
    debug('Global init end');
  }

  // 持久化Profile信息
  static saveProfile() async {
    //TODO: save profile
    // debug('save profile: username: ${profile.username}, isLogout: ${profile.isLogout}');
    // var box = store.box<Profile>();
    // box.removeAll();
    // profile.id = 1;
    // box.put(profile);
  }
}