social-app/apps/lib/features/auth/presentation/bloc/auth_bloc.dart

import 'package:flutter_bloc/flutter_bloc.dart';
import '../../../../core/analytics/tracker.dart';
import '../../../../core/logging/logger.dart';
import '../../data/repositories/auth_repository.dart';
import 'auth_event.dart';
import 'auth_state.dart';

class AuthBloc extends Bloc<AuthEvent, AuthState> {
  final AuthRepository _repository;
  final Logger _logger = getLogger('features.auth.bloc');
  DateTime? _loginTime;

  AuthBloc(this._repository) : super(AuthInitial()) {
    on<AuthStarted>(_onStarted);
    on<AuthLoggedIn>(_onLoggedIn);
    on<AuthLoggedOut>(_onLoggedOut);
    on<AuthSessionInvalidated>(_onSessionInvalidated);
  }

  Future<void> _onStarted(AuthStarted event, Emitter<AuthState> emit) async {
    emit(AuthLoading());
    try {
      final refreshToken = await _repository.getRefreshToken();
      if (refreshToken != null) {
        final response = await _repository.refreshSession(refreshToken);
        _loginTime = DateTime.now();
        AnalyticsTracker.instance.setUserId(response.user.id);
        emit(
          AuthAuthenticated(
            user: AuthUser(id: response.user.id, phone: response.user.phone),
          ),
        );
        return;
      }
      emit(
        const AuthUnauthenticated(reason: AuthUnauthenticatedReason.signedOut),
      );
    } catch (e, stackTrace) {
      _logger.error(
        message: 'Session refresh failed',
        error: e,
        stackTrace: stackTrace,
      );
      try {
        await _repository.clearSessionLocalOnly();
      } catch (e, stackTrace) {
        _logger.error(
          message: 'Failed to clear local session',
          error: e,
          stackTrace: stackTrace,
        );
      } finally {
        emit(
          const AuthUnauthenticated(
            reason: AuthUnauthenticatedReason.startupRecoveryFailed,
          ),
        );
      }
    }
  }

  void _onLoggedIn(AuthLoggedIn event, Emitter<AuthState> emit) {
    _loginTime = DateTime.now();
    _logger.info(message: 'User logged in', extra: {'user_id': event.user.id});
    emit(AuthAuthenticated(user: event.user));
  }

  Future<void> _onLoggedOut(
    AuthLoggedOut event,
    Emitter<AuthState> emit,
  ) async {
    final sessionDuration = _loginTime != null
        ? DateTime.now().difference(_loginTime!).inSeconds
        : null;
    try {
      await _repository.deleteSession();
      _logger.info(message: 'User logged out');
    } catch (e, stackTrace) {
      _logger.error(
        message: 'Failed to delete session on logout',
        error: e,
        stackTrace: stackTrace,
      );
    } finally {
      AnalyticsTracker.instance.trackLogout(
        reason: 'manual',
        sessionDurationS: sessionDuration,
      );
      _loginTime = null;
      emit(
        const AuthUnauthenticated(reason: AuthUnauthenticatedReason.signedOut),
      );
    }
  }

  Future<void> _onSessionInvalidated(
    AuthSessionInvalidated event,
    Emitter<AuthState> emit,
  ) async {
    final sessionDuration = _loginTime != null
        ? DateTime.now().difference(_loginTime!).inSeconds
        : null;
    _logger.warning(message: 'Session invalidated by server');
    try {
      await _repository.clearSessionLocalOnly();
    } catch (e, stackTrace) {
      _logger.error(
        message: 'Failed to clear local session',
        error: e,
        stackTrace: stackTrace,
      );
    } finally {
      AnalyticsTracker.instance.trackLogout(
        reason: 'expired',
        sessionDurationS: sessionDuration,
      );
      _loginTime = null;
      emit(
        const AuthUnauthenticated(reason: AuthUnauthenticatedReason.expired),
      );
    }
  }
}