import 'package:flutter/foundation.dart';

import '../../../../core/logging/logger.dart';
import '../../data/repositories/auth_repository.dart';
import 'auth_state.dart';

class AuthBloc extends ChangeNotifier {
  AuthBloc({required AuthRepository repository}) : _repository = repository;

  final AuthRepository _repository;
  final Logger _logger = getLogger('features.auth.bloc');
  AuthState _state = AuthState.initial;
  bool _handlingUnauthorized = false;

  AuthState get state => _state;

  Future<void> start() async {
    _state = _state.copyWith(status: AuthStatus.loading, errorMessage: null);
    notifyListeners();

    try {
      final user = await _repository.recoverSession();
      if (user == null) {
        _state = const AuthState(status: AuthStatus.unauthenticated);
      } else {
        _state = AuthState(status: AuthStatus.authenticated, user: user);
      }
      notifyListeners();
    } catch (error, stackTrace) {
      _logger.error(
        message: 'Session recovery failed: ${error.runtimeType}',
        error: error.runtimeType.toString(),
        stackTrace: stackTrace,
      );
      await _repository.clearLocalSession();
      _state = AuthState(
        status: AuthStatus.unauthenticated,
        errorMessage: _toSafeMessage(error),
      );
      notifyListeners();
    }
  }

  Future<void> sendOtp(String email) async {
    await _repository.sendOtp(email);
  }

  Future<void> loginWithOtp({
    required String email,
    required String otp,
  }) async {
    final user = await _repository.loginWithEmailOtp(email: email, otp: otp);
    _logger.info(message: 'User logged in', extra: {'user_id': user.id});
    _state = AuthState(status: AuthStatus.authenticated, user: user);
    notifyListeners();
  }

  Future<void> logout() async {
    try {
      await _repository.logout();
    } catch (error, stackTrace) {
      _logger.error(
        message: 'User logout failed: ${error.runtimeType}',
        error: error.runtimeType.toString(),
        stackTrace: stackTrace,
      );
    }
    _logger.info(message: 'User logged out');
    _state = const AuthState(status: AuthStatus.unauthenticated);
    notifyListeners();
  }

  Future<void> handleUnauthorized401() async {
    if (_handlingUnauthorized) {
      return;
    }
    _handlingUnauthorized = true;
    try {
      await _repository.clearLocalSession();
      _logger.warning(message: 'Session invalidated by 401 callback');
      _state = const AuthState(status: AuthStatus.unauthenticated);
      notifyListeners();
    } finally {
      _handlingUnauthorized = false;
    }
  }

  String _toSafeMessage(Object error) {
    return 'Request failed, please try again';
  }
}