# WalkGuide Traceability Audit

## Use Case To Code

| Use Case | Flutter Entry | Backend Entry | Status |
|---|---|---|---|
| Register/Login | `features/auth/*` | `AuthController`, `AuthService` | Implemented |
| Pair Guardian/User | `features/pairing/pairing_screens.dart` | `PairingController`, `PairingService` | Implemented |
| Start/Stop WalkGuide | `features/walk_guide/walk_guide_screen.dart` | `POST /user/walkguide/start`, `POST /user/walkguide/stop` | Implemented |
| Obstacle Detection | `core/ai/*`, `walk_guide_screen.dart` | `POST /user/obstacle` | Partially implemented; real `.tflite` model file still required |
| Location Tracking | `LocationReporterService`, navigation/walk screens | `LocationService`, `LocationBroadcaster` | Implemented |
| SOS | `features/sos/sos_screen.dart` | `SosService`, `GuardianController` | Implemented |
| Notifications | `features/notifications/notification_screen.dart` | `NotificationService`, `FcmService` | Partially implemented; backend FCM is log-only without credentials |
| Guardian Dashboard | `guardian_dashboard_screen.dart` | `GuardianDashboardService` | Implemented |
| Call | `features/call/call_screen.dart`, `CallService` | `CallController`, `AgoraTokenService` | Partially implemented; Agora App ID/credential required for live call |
| Geofence | guardian dashboard screens | `GeofenceService` | Implemented |

## Design Deviations

- Flutter uses a pragmatic mix of BLoC/Cubit, ChangeNotifier, and StatefulWidget. This deviates from strict full-BLoC architecture but keeps feature screens small for the exam demo.
- Offline storage uses `SharedPreferences` queue instead of a full Drift database for cached entities. The dependency exists, but production-grade SQLite cache is not fully wired.
- Backend FCM service is log-only until Firebase Admin credentials are provided.
- Agora call flow is implemented at API and service level, but live RTC depends on a real Agora App ID.

## Remaining Evidence

- Export rendered OOAD diagrams from the PlantUML files in this folder.
- Run backend tests and archive JaCoCo/Surefire reports.
- Run Flutter benchmarks on a physical Android device and add screenshots/results.