import 'dart:developer';

import 'package:flutter/foundation.dart';

import '../../api/errors/auth_exception.dart';
import '../../api/errors/error_mapper.dart';
import '../../api/marianumcloud/talk/room/get_room.dart';
import '../../api/marianumcloud/talk/room/get_room_params.dart';
import '../../model/account_data.dart';

/// Owns the login flow's transient state (loading, last error) so it can be
/// driven from a thin Stateful view and unit-tested without a widget tree.
class LoginController extends ChangeNotifier {
  bool _loading = false;
  String? _errorMessage;
  String? _errorDetails;

  bool get loading => _loading;
  String? get errorMessage => _errorMessage;
  String? get errorDetails => _errorDetails;

  /// Returns `true` when the credential probe succeeded. The view should
  /// then transition the AccountBloc to `loggedIn`.
  Future<bool> submit(String username, String password) async {
    if (_loading) return false;
    _loading = true;
    _errorMessage = null;
    _errorDetails = null;
    notifyListeners();

    final user = username.trim().toLowerCase();
    try {
      await AccountData().removeData();
      await AccountData().setData(user, password);
      await GetRoom(GetRoomParams(includeStatus: false)).run();
      _loading = false;
      notifyListeners();
      return true;
    } catch (e) {
      log(e.toString());
      await AccountData().removeData();
      // 401 from the probe means the credentials were wrong; everything else
      // (no network, server down, TLS errors, …) gets the generic mapped
      // message so the user knows it isn't their typo.
      final isWrongCredentials = e is AuthException && e.statusCode == 401;
      _errorMessage = isWrongCredentials
          ? 'Benutzername oder Passwort falsch.'
          : errorToUserMessage(e);
      _errorDetails = errorToTechnicalDetails(e);
      _loading = false;
      notifyListeners();
      return false;
    }
  }
}