import 'package:flutter_bloc/flutter_bloc.dart';
import '../../data/repositories/auth_repository.dart';
import 'auth_event.dart';
import 'auth_state.dart';

class AuthBloc extends Bloc<AuthEvent, AuthState> {
  final AuthRepository _repository;

  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);
        emit(
          AuthAuthenticated(
            user: AuthUser(id: response.user.id, phone: response.user.phone),
          ),
        );
        return;
      }
      emit(
        const AuthUnauthenticated(reason: AuthUnauthenticatedReason.signedOut),
      );
    } catch (_) {
      try {
        await _repository.clearSessionLocalOnly();
      } catch (_) {
        // Keep state convergence even when storage cleanup fails.
      } finally {
        emit(
          const AuthUnauthenticated(
            reason: AuthUnauthenticatedReason.startupRecoveryFailed,
          ),
        );
      }
    }
  }

  void _onLoggedIn(AuthLoggedIn event, Emitter<AuthState> emit) {
    emit(AuthAuthenticated(user: event.user));
  }

  Future<void> _onLoggedOut(
    AuthLoggedOut event,
    Emitter<AuthState> emit,
  ) async {
    try {
      await _repository.deleteSession();
    } catch (_) {
      // Keep state convergence even when logout cleanup fails.
    } finally {
      emit(
        const AuthUnauthenticated(reason: AuthUnauthenticatedReason.signedOut),
      );
    }
  }

  Future<void> _onSessionInvalidated(
    AuthSessionInvalidated event,
    Emitter<AuthState> emit,
  ) async {
    try {
      await _repository.clearSessionLocalOnly();
    } catch (_) {
      // Keep state convergence even when local cleanup fails.
    } finally {
      emit(
        const AuthUnauthenticated(reason: AuthUnauthenticatedReason.expired),
      );
    }
  }
}