import 'dart:convert';

import 'package:flutter/foundation.dart';
import 'package:get/get.dart';
import 'package:json_annotation/json_annotation.dart';
import 'package:shared_preferences/shared_preferences.dart';

part 'user.g.dart';

@JsonSerializable()
class UserInfo {
  int userId;
  String userName;
  String? nickName;
  String? avatarUrl;

  UserInfo(
      {required this.userId,
      required this.userName,
      this.nickName,
      this.avatarUrl});

  factory UserInfo.fromJson(Map<String, dynamic> json) =>
      _$UserInfoFromJson(json);

  Map<String, dynamic> toJson() => _$UserInfoToJson(this);
}

class UserController extends GetxController {
  bool isReady = false;

  var userId = 0.obs;

  bool get isLoggedIn {
    return userId.value > 0;
  }

  var userName = "".obs;
  var nickName = "".obs;
  var avatarUrl = "".obs;

  String get getDisplayName {
    return nickName.isNotEmpty ? nickName.string : userName.string;
  }

  Future<void> initialize() async {
    if (!isReady) {
      await loadFromStorage();
      isReady = true;

      postInit().catchError((err) {
        if (kDebugMode) {
          print(err);
        }
      });
    }
  }

  Future<void> postInit() async {
    await updateProfile();
  }

  /// 更新用户资料，并检测登录状态
  Future<void> updateProfile() async {}

  /// 从本地存储读取
  Future<void> loadFromStorage() async {
    try {
      final prefs = await SharedPreferences.getInstance();
      var userInfoJson = prefs.getString("userInfo");
      if (userInfoJson == null) return;

      var userInfoObject = jsonDecode(userInfoJson);
      if (userInfoObject == null) return;

      var userInfo = UserInfo.fromJson(userInfoObject);

      userId.value = userInfo.userId;
      userName.value = userInfo.userName;
      nickName.value = userInfo.nickName ?? "";
      avatarUrl.value = userInfo.avatarUrl ?? "";
    } catch (ex) {
      if (kDebugMode) {
        print(ex);
      }
    }
  }

  /// 保存到本地存储
  Future<void> saveToStorage() async {
    final prefs = await SharedPreferences.getInstance();

    var userInfo = UserInfo(
      userId: userId.value,
      userName: userName.value,
      nickName: nickName.isNotEmpty ? nickName.value : null,
      avatarUrl: avatarUrl.isNotEmpty ? avatarUrl.value : null,
    );

    var userInfoJson = jsonEncode(userInfo.toJson());

    prefs.setString("userInfo", userInfoJson);
  }
}