// ignore: depend_on_referenced_packages
// ignore_for_file: avoid_print

import 'package:collection/collection.dart';
import 'package:didvan/config/auth_config.dart';
import 'package:didvan/main.dart';
import 'package:didvan/models/enums.dart';
import 'package:didvan/models/user.dart';
import 'package:didvan/models/view/alert_data.dart';
import 'package:didvan/providers/core.dart';
import 'package:didvan/services/auth/auth_api_service.dart';
import 'package:didvan/services/auth/keycloak_auth_service.dart';
import 'package:didvan/services/auth/token_storage.dart';
import 'package:didvan/services/network/request.dart';
import 'package:didvan/services/network/request_helper.dart';
import 'package:didvan/services/notification/firebase_api.dart';
import 'package:didvan/services/notification/notification_service.dart';
import 'package:didvan/services/storage/storage.dart';
import 'package:didvan/utils/action_sheet.dart';

class UserProvider extends CoreProvier {
  late User user;
  bool isAuthenticated = false;
  int _unreadMessageCount = 0;

  String? _welcomeMessage;
  bool _isLoadingWelcome = true;

  String? get welcomeMessage => _welcomeMessage;
  bool get isLoadingWelcome => _isLoadingWelcome;

  set unreadMessageCount(int value) {
    if (value < 0) {
      return;
    }
    _unreadMessageCount = value;
    notifyListeners();
  }

  int get unreadMessageCount => _unreadMessageCount;

  static final List<MapEntry> _statisticMarkQueue = [];
  static final List<Map> _itemMarkQueue = [];

  Future<void> fetchWelcomeMessage() async {
    if (!_isLoadingWelcome) {
      _isLoadingWelcome = true;
      notifyListeners();
    }

    if (!AuthConfig.useLegacyApi) {
      final hour = DateTime.now().hour;
      String period;
      if (hour < 12) {
        period = 'صبح';
      } else if (hour < 17) {
        period = 'ظهر';
      } else if (hour < 20) {
        period = 'عصر';
      } else {
        period = 'شب';
      }
      String name = '';
      try {
        name = user.fullName;
      } catch (_) {}
      _welcomeMessage =
          name.isEmpty ? '$period بخیر 👋' : '$period بخیر $name 👋';
      _isLoadingWelcome = false;
      notifyListeners();
      return;
    }

    try {
      const String url = 'https://api.didvan.app/ai/aiwellcom';
      if (RequestService.token == null) {
        print("UserProvider: fetchWelcomeMessage skipped, token is null.");
        _isLoadingWelcome = false;
        notifyListeners();
        return;
      }
      print("UserProvider: Fetching welcome message...");

      final service = RequestService(url, useAutherization: true);
      await service.post();

      if (service.isSuccess) {
        print("UserProvider: Welcome message API success.");
        final period = service.data('period');
        final userData = service.data('user');
        if (period != null &&
            userData is Map &&
            userData.containsKey('fullName')) {
          final fullName = userData['fullName'];
          _welcomeMessage = '$period بخیر $fullName 👋';
          print("UserProvider: Welcome message set: $_welcomeMessage");
        } else {
          print(
              "UserProvider: Welcome message API success but data format unexpected.");
          _welcomeMessage = null;
        }
      } else {
        print(
            "UserProvider: Welcome message API failed. Status: ${service.statusCode}, Error: ${service.errorMessage}");
        _welcomeMessage = null;
      }
    } catch (e) {
      print("UserProvider: Exception fetching welcome message: $e");
      _welcomeMessage = null;
    } finally {
      _isLoadingWelcome = false;
      print(
          "UserProvider: fetchWelcomeMessage finished. isLoadingWelcome: $_isLoadingWelcome");
      notifyListeners();
    }
  }

  Future<String?> setAndGetToken({String? newToken}) async {
    try {
      if (newToken == null) {
        final cached = TokenStorage.accessToken;
        if (cached != null && cached.isNotEmpty) {
          RequestService.token = cached;
          return cached;
        }
        final token = await StorageService.getValue(key: 'token');
        if (token != null) RequestService.token = token;
        return token;
      }
      RequestService.token = newToken;
      await StorageService.setValue(key: 'token', value: newToken);
      return null;
    } catch (e) {
      return null;
    }
  }

  Future<bool> getUserInfo() async {
    isAuthenticated = true;
    print("UserProvider: Getting user info...");

    final keycloakId = TokenStorage.userId;
    if (keycloakId == null || keycloakId.isEmpty) {
      print("UserProvider: getUserInfo failed - no user id in token.");
      isAuthenticated = false;
      return false;
    }

    final userinfo = await KeycloakAuthService.instance.fetchUserInfo();
    if (userinfo == null) {
      print("UserProvider: userinfo failed (likely 401).");
      isAuthenticated = false;
      return false;
    }

    final result = await AuthApiService.instance.getUserInfo(keycloakId);

    Map<String, dynamic> mergedData;
    if (result.isSuccess && result.data != null) {
      mergedData = {..._userinfoToAppShape(userinfo), ...result.data!};
      print("UserProvider: User info merged from userinfo + auth-service.");
    } else {
      print("UserProvider: auth-service ${result.statusCode ?? 'n/a'} -> "
          "fallback to userinfo only.");
      mergedData = _userinfoToAppShape(userinfo);
    }

    try {
      user = User.fromJson(mergedData);

      if (mergedData['start'] != null) {
        await StorageService.setValue(
          key: 'notificationTimeRangeStart',
          value: mergedData['start'],
        );
      }
      if (mergedData['end'] != null) {
        await StorageService.setValue(
          key: 'notificationTimeRangeEnd',
          value: mergedData['end'],
        );
      }

      // ignore: discarded_futures
      _registerFirebaseToken();

      notifyListeners();

      // ignore: discarded_futures
      fetchWelcomeMessage();

      // If the user reached us via a notification tap while logged out,
      // splash stashed the payload. Now that we're authenticated, replay
      // it so they land on the right detail screen instead of staying on
      // the home page.
      // ignore: discarded_futures
      NotificationService.consumePendingNotificationTap();

      return true;
    } catch (e) {
      print("UserProvider: Exception processing user info: $e");
      isAuthenticated = false;
      return false;
    }
  }

  Map<String, dynamic> _userinfoToAppShape(Map<String, dynamic> uinfo) {
    return {
      'id': uinfo['sub'],
      'keycloakId': uinfo['sub'],
      'username': uinfo['preferred_username'],
      'firstName': uinfo['given_name'],
      'lastName': uinfo['family_name'],
      'fullName': uinfo['name'],
      'email': uinfo['email'],
      // attribute هایی که فقط در صورت تنظیم Protocol Mapper در client می‌آیند:
      'phone': uinfo['phone'] ?? uinfo['phone_number'],
      'avatar': uinfo['avatar'] ?? uinfo['picture'],
    };
  }

  Future<void> _registerFirebaseToken() async {
    if (FirebaseApi.fcmToken == null) return;
    final id = TokenStorage.userId ?? user.keycloakId;
    if (id == null || id.isEmpty) return;

    // کلید DTO سمت backend `firebaseToken` (camelCase) است — backend خودش
    // در users.service.ts آن را به `firebase_token` در Keycloak attribute
    // تبدیل می‌کند (پس از fix snake_case در update path).
    await AuthApiService.instance.updateUser(
      id: id,
      data: {'firebaseToken': FirebaseApi.fcmToken},
    );
  }

  Future<void> logout() async {
    print('UserProvider: logout() called - clearing local state first');

    final refreshToken = TokenStorage.refreshToken;

    RequestService.token = null;
    await TokenStorage.clear();
    await StorageService.delete(key: 'token');
    isAuthenticated = false;
    notifyListeners();
    print('UserProvider: local state cleared, '
        'accessToken=${TokenStorage.accessToken}');

    if (refreshToken != null) {
      // ignore: discarded_futures
      KeycloakAuthService.instance.revokeRefreshToken(refreshToken);
    }
  }

  Future<bool> setProfilePhoto(dynamic file) async {
    // TODO(auth-followup): پیاده‌سازی آپلود به s3-service و سپس فراخوانی
    //   AuthApiService.instance.setProfilePicture(id, key).
    appState = AppState.failed;
    return false;
  }

  Future<bool> deleteProfilePhoto() async {
    appState = AppState.isolatedBusy;
    final id = TokenStorage.userId ?? user.keycloakId;
    if (id == null || id.isEmpty) {
      appState = AppState.idle;
      return false;
    }
    final result = await AuthApiService.instance.updateUser(
      id: id,
      data: {'avatar': null},
    );
    if (result.isSuccess) {
      user = user.copyWith(photo: null);
      appState = AppState.idle;
      return true;
    }
    appState = AppState.idle;
    return false;
  }

  Future<bool?> checkUsername(String username) async {
    if (user.username == username) return true;
    final result = await AuthApiService.instance.getRequiredActions(username);
    if (result.statusCode == 404) return true; // موجود نیست => قابل استفاده
    if (result.isSuccess) return false; // پیدا شد => تکراری
    return null;
  }

  Future<void> editProfile(
    String fullName,
    String? username,
    String? email,
  ) async {
    appState = AppState.isolatedBusy;
    final id = TokenStorage.userId ?? user.keycloakId;
    if (id == null || id.isEmpty) {
      appState = AppState.idle;
      ActionSheetUtils(navigatorKey.currentContext!).showAlert(
        AlertData(message: 'شناسه کاربر یافت نشد.'),
      );
      return;
    }

    final parts = fullName.trim().split(RegExp(r'\s+'));
    final firstName = parts.isNotEmpty ? parts.first : '';
    final lastName = parts.length > 1 ? parts.sublist(1).join(' ') : '';

    final data = <String, dynamic>{
      'firstName': firstName,
      'lastName': lastName,
      if (email != null) 'email': email,
    };

    final result = await AuthApiService.instance.updateUser(id: id, data: data);

    if (result.isSuccess) {
      user = user.copyWith(
        fullName: fullName,
        firstName: firstName,
        lastName: lastName,
        email: email,
        username: username,
        photo: user.photo,
      );
      appState = AppState.idle;
      ActionSheetUtils(navigatorKey.currentContext!).pop();
      ActionSheetUtils(navigatorKey.currentContext!).showAlert(
        AlertData(
          message: 'پروفایل با موفقیت ویرایش شد',
          aLertType: ALertType.success,
        ),
      );
      return;
    }
    appState = AppState.idle;
    ActionSheetUtils(navigatorKey.currentContext!).showAlert(
      AlertData(
        message: result.errorMessage ?? 'خطا در ویرایش پروفایل.',
      ),
    );
  }

  static Future<void> changeItemMark(String type, int id, bool? value,
      {String? description}) async {
    _itemMarkQueue.add({
      'type': type,
      'id': id,
      'value': value,
      'description': description,
    });
    Future.delayed(const Duration(milliseconds: 500), () async {
      final lastChange =
          _itemMarkQueue.lastWhereOrNull((item) => item['id'] == id);
      if (lastChange == null) return;
      final service = RequestService(
        RequestHelper.editItemBookmark(type, id),
        body: {'description': lastChange['description']},
      );
      if (lastChange['value'] == true) {
        await service.post();
      } else if (lastChange['value'] == false) {
        await service.delete();
      } else {
        service.put();
      }
      _itemMarkQueue.removeWhere((element) => element['id'] == id);
    });
  }

  static Future<void> changeItemLiked(
    String type,
    int id,
    bool value,
  ) async {
    if (type == 'infography') {
      type = 'banner';
    }
    final service = RequestService(
      RequestHelper.editItemLike(type, id),
    );

    if (value) {
      await service.post();
    } else {
      await service.delete();
    }
  }

  static Future<void> changeStatisticMark(int id, bool value) async {
    _statisticMarkQueue.add(MapEntry(id, value));
    Future.delayed(const Duration(milliseconds: 500), () async {
      final MapEntry? lastChange =
          _statisticMarkQueue.lastWhereOrNull((item) => item.key == id);
      if (lastChange == null) return;
      final service = RequestService(RequestHelper.mark(id, 'statistic'));
      if (lastChange.value) {
        await service.post();
      } else {
        await service.delete();
      }
      _statisticMarkQueue.removeWhere((element) => element.key == id);
    });
  }

  Future<bool> changePassword({
    required String currentPassword,
    required String newPassword,
  }) async {
    try {
      final username = user.username;
      if (username == null || username.isEmpty) {
        return false;
      }
      final loginResult = await KeycloakAuthService.instance.login(
        username: username,
        password: currentPassword,
      );
      if (!loginResult.success) {
        return false;
      }

      final id = TokenStorage.userId ?? user.keycloakId;
      if (id == null || id.isEmpty) return false;
      final result = await AuthApiService.instance.setOwnPassword(
        id: id,
        newPassword: newPassword,
      );
      return result.isSuccess;
    } catch (e) {
      print('Error changing password: $e');
      return false;
    }
  }
}