import 'dart:convert';

import 'package:flutter/foundation.dart';
import 'package:get/get.dart';
import 'package:isekai_wiki/global.dart';
import 'package:json_annotation/json_annotation.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 _ignoreSave = false;

  var loginRequestToken = "".obs;

  var userId = 0.obs;

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

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

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

  @override
  void onInit() async {
    super.onInit();

    loadFromStorage();

    ever(loginRequestToken, (String token) {
      saveToStorage();
    });
  }

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

  /// 从本地存储读取
  void loadFromStorage() {
    try {
      final prefs = Global.sharedPreferences!;
      var userInfoJson = prefs.getString("userInfo");
      if (userInfoJson == null) return;

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

      var userInfo = UserInfo.fromJson(userInfoObject);

      _ignoreSave = true;
      userId.value = userInfo.userId;
      userName.value = userInfo.userName;
      nickName.value = userInfo.nickName ?? "";
      avatarUrl.value = userInfo.avatarUrl ?? "";
      _ignoreSave = false;

      var savedLoginRequestToken = prefs.getString("loginRequestToken");
      if (savedLoginRequestToken != null) {
        _ignoreSave = true;
        loginRequestToken.value = savedLoginRequestToken;
        _ignoreSave = false;
      }
    } catch (ex) {
      if (kDebugMode) {
        print(ex);
      }
    } finally {
      _ignoreSave = false;
    }
  }

  /// 保存到本地存储
  void saveToStorage() {
    if (_ignoreSave) return;

    final prefs = Global.sharedPreferences!;

    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);

    if (loginRequestToken.isNotEmpty) {
      prefs.setString("loginRequestToken", loginRequestToken.value);
    } else if (prefs.containsKey("loginRequestToken")) {
      prefs.remove("loginRequestToken");
    }
  }

  /// 开始登录流程
  /// 从服务器获取loginRequestToken
  Future<bool> startAuthFlow() async {
    return false;
  }

  // 尝试通过登录请求Token完成登录
  Future<void> attemptFinishAuth() async {
    if (loginRequestToken.isEmpty) return;
  }
}