import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import '../model/user_model.dart';
import '../service/user_service.dart';
import '../tool/encryption_util.dart';

class UserProvider with ChangeNotifier {
  UserModel? _user;
  String? _token;
  List<String> _sexTags = [];

  // --- 成绩数据源相关状态 ---
  String _scoreDataSource = 'cn'; // 'cn' or 'sega'
  String? _selectedSegaId;        // 选中的 SegaID

  // --- 新增：国服多账号支持 ---
  String? _selectedCnUserName;    // 选中的国服用户名 (对应 userName2userId 的 key)

  UserModel? get user => _user;
  String? get token => _token;
  bool get isLogin => _token != null && _user != null;
  String get username => _user?.name ?? "未登录";
  List<String> get sexTags => _sexTags;

  String get scoreDataSource => _scoreDataSource;
  String? get selectedSegaId => _selectedSegaId;
  String? get selectedCnUserName => _selectedCnUserName; // Getter for CN username

  List<SegaCard> get availableSegaCards => _user?.segaCards ?? [];

  // 获取可用的国服账号列表 (从 userName2userId 提取 keys)
  List<String> get availableCnUserNames {
    final map = _user?.userName2userId;
    if (map == null || map.isEmpty) return [];
    return map.keys.toList();
  }

  String get avatarUrl {
    if (_user?.iconId != null) {
      return "https://cdn.godserver.cn/resource/static/coll/Icon/UI_Icon_${_user!.iconId!}.png";
    } else {
      return "https://cdn.godserver.cn/resource/static/coll/Icon/UI_Icon_605526.png";
    }
  }

  static UserProvider? _instance;
  static UserProvider get instance {
    _instance ??= UserProvider();
    return _instance!;
  }

  Future<void> initUser() async {
    final prefs = await SharedPreferences.getInstance();
    _token = prefs.getString("token");

    // 读取偏好设置
    _scoreDataSource = prefs.getString("scoreDataSource") ?? 'cn';
    _selectedSegaId = prefs.getString("selectedSegaId");
    _selectedCnUserName = prefs.getString("selectedCnUserName");

    if (_token != null) {
      try {
        _user = await UserService.getUserInfo(_token!);
        await fetchSexTags();

        // 校验 SegaID 有效性
        if (_selectedSegaId != null && !availableSegaCards.any((c) => c.segaId == _selectedSegaId)) {
          _selectedSegaId = null;
          await prefs.remove("selectedSegaId");
        }

        // 校验国服用户名有效性
        if (_selectedCnUserName != null && !availableCnUserNames.contains(_selectedCnUserName)) {
          _selectedCnUserName = null;
          await prefs.remove("selectedCnUserName");
        }
      } catch (e) {
        await logout();
      }
    }
    notifyListeners();
  }

  // ... (login, register, logout 保持不变) ...
  Future<void> login(String username, String twoKeyCode) async {
    try {
      _token = await UserService.login(username, twoKeyCode);
      if (_token != null && _token!.isNotEmpty) {
        final prefs = await SharedPreferences.getInstance();
        await prefs.setString("token", _token!);
        _user = await UserService.getUserInfo(_token!);
        await fetchSexTags();
      }
    } catch (e) {
      rethrow;
    } finally {
      notifyListeners();
    }
  }

  Future<void> register(String username, String password, String inviter) async {
    await UserService.register(username, password, inviter);
    await login(username, password);
  }

  Future<void> logout() async {
    _token = null;
    _user = null;
    final prefs = await SharedPreferences.getInstance();
    await prefs.remove("token");
    notifyListeners();
  }

  // ... (saveUserInfo, refreshToken, fetchRadarData, fetchSexTags, updateUser 保持不变) ...
  Future<void> saveUserInfo() async {
    if (_token == null || _user == null) return;
    try {
      final userJson = _user!.toJson();
      final encrypted = EncryptionUtil.encryptAndCompress(jsonEncode(userJson));
      await UserService.updateUser(_token!, encrypted);
      _user = await UserService.getUserInfo(_token!);
      notifyListeners();
    } catch (e) {
      rethrow;
    }
  }

  Future<bool> refreshToken() async {
    if (_token == null) return false;
    try {
      final newToken = await UserService.refreshToken(_token!);
      if (newToken != null) {
        _token = newToken;
        final prefs = await SharedPreferences.getInstance();
        await prefs.setString("token", newToken);
        notifyListeners();
        return true;
      }
    } catch (e) {
      await logout();
    }
    return false;
  }

  Future<Map<String, dynamic>> fetchRadarData(String id) async {
    if (_token == null) throw "请先登录";
    try {
      return await UserService.getRadarData(_token!, id);
    } catch (e) {
      rethrow;
    }
  }

  Future<void> fetchSexTags() async {
    _sexTags = await UserService.fetchSexTags();
    notifyListeners();
  }

  void updateUser(UserModel? newUser) {
    _user = newUser;
    notifyListeners();
  }

  // --- 设置数据源 ---
  Future<void> setScoreDataSource(String source) async {
    _scoreDataSource = source;
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString("scoreDataSource", source);
    notifyListeners();
  }

  // --- 设置选中的 SegaID ---
  Future<void> setSelectedSegaId(String? segaId) async {
    _selectedSegaId = segaId;
    final prefs = await SharedPreferences.getInstance();
    if (segaId != null) {
      await prefs.setString("selectedSegaId", segaId);
    } else {
      await prefs.remove("selectedSegaId");
    }
    notifyListeners();
  }

  // --- 【新增】设置选中的国服用户名 ---
  Future<void> setSelectedCnUserName(String? userName) async {
    _selectedCnUserName = userName;
    final prefs = await SharedPreferences.getInstance();
    if (userName != null && userName.isNotEmpty) {
      await prefs.setString("selectedCnUserName", userName);
    } else {
      await prefs.remove("selectedCnUserName");
    }
    notifyListeners();
  }

  Future<void> syncSegaScore(Map<String, dynamic> data) async {
    if (_token == null || _user == null) {
      throw "请先登录";
    }
    if (_selectedSegaId == null || _selectedSegaId!.isEmpty) {
      throw "请先选择要同步的 SegaID";
    }

    try {
      // 调用上传
      final result = await UserService.uploadSegaRating(
        _token!,
        _selectedSegaId!,
        data,
      );

      if (result["code"] == 200) {
        print("✅ 同步成功：${result["msg"]}");
      } else {
        print("❌ 同步失败：${result["msg"]}");
        throw result["msg"] ?? "同步失败";
      }
    } catch (e) {
      print("❌ 同步异常：$e");
      rethrow;
    }
  }
}