Refactor clock-in feature: Introduce validation pipeline and interaction strategies

- Added a validation pipeline for clock-in actions, including geofence, time window, and override notes validators.
- Created a context class for passing validation data and results.
- Implemented check-in interaction strategies for swipe and NFC methods, encapsulating their UI and behavior.
- Removed redundant utility functions and centralized time formatting in a new utility file.
- Enhanced the notification service to handle clock-in and clock-out notifications separately.
- Updated the ClockInBloc to utilize the new validation and notification services.
- Cleaned up the ClockInActionSection widget to use the new interaction strategies and removed unnecessary listeners.

.claude/agents/mobile-builder.md

@@ -56,6 +56,15 @@ If any of these files are missing or unreadable, notify the user before proceedi
 - Use `UiColors`, `UiTypography`, `UiIcons`, `UiConstants` for all design values
 - Use `core_localization` for user-facing strings
 - Add concise `///` doc comments to every class, method, and field. Keep them short (1-2 lines) — just enough for another developer to understand the purpose without reading the implementation.
+- **Always specify explicit types** on every local variable, loop variable, and lambda parameter — never use `final x = ...` or `var x = ...` without the type. Example: `final String name = getName();` not `final name = getName();`. This is enforced by the `always_specify_types` lint rule.
+- **Always place constructors before fields and methods** in class declarations. The correct order is: constructor → fields → methods. This is enforced by the `sort_constructors_first` lint rule. Example:
+  ```dart
+  class MyClass {
+    const MyClass({required this.name});
+    final String name;
+    void doSomething() {}
+  }
+  ```
 
 ## Standard Workflow
 
@@ -121,13 +130,19 @@ features/
       entities/          # Pure Dart classes
       repositories/      # Abstract interfaces
       usecases/          # Business logic lives HERE
+      validators/        # Composable validation pipeline (optional)
       domain.dart        # Barrel file
     data/
       models/            # With fromJson/toJson
       repositories/      # Concrete implementations
       data.dart          # Barrel file
     presentation/
-      bloc/              # Events, states, BLoC
+      bloc/
+        feature_bloc/    # Each BLoC in its own subfolder
+          feature_bloc.dart
+          feature_event.dart
+          feature_state.dart
+      strategies/        # Strategy pattern implementations (optional)
       screens/           # Full pages
       widgets/           # Reusable components
       presentation.dart  # Barrel file

apps/mobile/packages/core/lib/core.dart

@@ -6,6 +6,7 @@ export 'src/domain/arguments/usecase_argument.dart';
 export 'src/domain/usecases/usecase.dart';
 export 'src/utils/date_time_utils.dart';
 export 'src/utils/geo_utils.dart';
+export 'src/utils/time_utils.dart';
 export 'src/presentation/widgets/web_mobile_frame.dart';
 export 'src/presentation/mixins/bloc_error_handler.dart';
 export 'src/presentation/observers/core_bloc_observer.dart';

apps/mobile/packages/core/lib/src/utils/time_utils.dart

@@ -0,0 +1,30 @@
+import 'package:intl/intl.dart';
+
+/// Formats a time string (ISO 8601 or HH:mm) into 12-hour format
+/// (e.g. "9:00 AM").
+///
+/// Returns the original string unchanged if parsing fails.
+String formatTime(String timeStr) {
+  if (timeStr.isEmpty) return '';
+  try {
+    final DateTime dt = DateTime.parse(timeStr);
+    return DateFormat('h:mm a').format(dt);
+  } catch (_) {
+    try {
+      final List<String> parts = timeStr.split(':');
+      if (parts.length >= 2) {
+        final DateTime dt = DateTime(
+          2022,
+          1,
+          1,
+          int.parse(parts[0]),
+          int.parse(parts[1]),
+        );
+        return DateFormat('h:mm a').format(dt);
+      }
+      return timeStr;
+    } catch (_) {
+      return timeStr;
+    }
+  }
+}

apps/mobile/packages/core/pubspec.yaml

@@ -18,6 +18,7 @@ dependencies:
   design_system:
     path: ../design_system
   
+  intl: ^0.20.0
   flutter_bloc: ^8.1.0
   equatable: ^2.0.8
   flutter_modular: ^6.4.1

apps/mobile/packages/features/staff/clock_in/lib/src/data/services/background_geofence_service.dart

@@ -90,24 +90,21 @@ void backgroundGeofenceDispatcher() {
 
 /// Service that manages periodic background geofence checks while clocked in.
 ///
-/// Uses core services for foreground operations. The background isolate logic
-/// lives in the top-level [backgroundGeofenceDispatcher] function above.
+/// Handles scheduling and cancelling background tasks only. Notification
+/// delivery is handled by [ClockInNotificationService]. The background isolate
+/// logic lives in the top-level [backgroundGeofenceDispatcher] function above.
 class BackgroundGeofenceService {
 
   /// Creates a [BackgroundGeofenceService] instance.
   BackgroundGeofenceService({
     required BackgroundTaskService backgroundTaskService,
-    required NotificationService notificationService,
     required StorageService storageService,
   })  : _backgroundTaskService = backgroundTaskService,
-        _notificationService = notificationService,
         _storageService = storageService;
+
   /// The core background task service for scheduling periodic work.
   final BackgroundTaskService _backgroundTaskService;
 
-  /// The core notification service for displaying local notifications.
-  final NotificationService _notificationService;
-
   /// The core storage service for persisting geofence target data.
   final StorageService _storageService;
 
@@ -129,18 +126,15 @@ class BackgroundGeofenceService {
   /// Task name identifier for the workmanager callback.
   static const String taskName = 'geofenceCheck';
 
-  /// Notification ID for clock-in greeting notifications.
-  static const int _clockInNotificationId = 1;
-
   /// Notification ID for left-geofence warnings.
+  ///
+  /// Kept here because the top-level [backgroundGeofenceDispatcher] references
+  /// it directly (background isolate has no DI access).
   static const int leftGeofenceNotificationId = 2;
 
   /// Geofence radius in meters.
   static const double geofenceRadiusMeters = 500;
 
-  /// Notification ID for clock-out notifications.
-  static const int _clockOutNotificationId = 3;
-
   /// Starts periodic 15-minute background geofence checks.
   ///
   /// Called after a successful clock-in. Persists the target coordinates
@@ -188,40 +182,4 @@ class BackgroundGeofenceService {
     final bool? active = await _storageService.getBool(_keyTrackingActive);
     return active ?? false;
   }
-
-  /// Shows a notification that the worker has left the geofence.
-  Future<void> showLeftGeofenceNotification({
-    required String title,
-    required String body,
-  }) async {
-    await _notificationService.showNotification(
-      title: title,
-      body: body,
-      id: leftGeofenceNotificationId,
-    );
-  }
-
-  /// Shows a greeting notification upon successful clock-in.
-  Future<void> showClockInGreetingNotification({
-    required String title,
-    required String body,
-  }) async {
-    await _notificationService.showNotification(
-      title: title,
-      body: body,
-      id: _clockInNotificationId,
-    );
-  }
-
-  /// Shows a notification upon successful clock-out.
-  Future<void> showClockOutNotification({
-    required String title,
-    required String body,
-  }) async {
-    await _notificationService.showNotification(
-      title: title,
-      body: body,
-      id: _clockOutNotificationId,
-    );
-  }
 }

apps/mobile/packages/features/staff/clock_in/lib/src/data/services/clock_in_notification_service.dart

@@ -0,0 +1,61 @@
+import 'package:krow_core/core.dart';
+
+/// Service responsible for displaying clock-in related local notifications.
+///
+/// Encapsulates notification logic extracted from [BackgroundGeofenceService]
+/// so that geofence tracking and user-facing notifications have separate
+/// responsibilities.
+class ClockInNotificationService {
+  /// Creates a [ClockInNotificationService] instance.
+  const ClockInNotificationService({
+    required NotificationService notificationService,
+  }) : _notificationService = notificationService;
+
+  /// The underlying core notification service.
+  final NotificationService _notificationService;
+
+  /// Notification ID for clock-in greeting notifications.
+  static const int _clockInNotificationId = 1;
+
+  /// Notification ID for left-geofence warnings.
+  static const int leftGeofenceNotificationId = 2;
+
+  /// Notification ID for clock-out notifications.
+  static const int _clockOutNotificationId = 3;
+
+  /// Shows a greeting notification after successful clock-in.
+  Future<void> showClockInGreeting({
+    required String title,
+    required String body,
+  }) async {
+    await _notificationService.showNotification(
+      title: title,
+      body: body,
+      id: _clockInNotificationId,
+    );
+  }
+
+  /// Shows a notification when the worker clocks out.
+  Future<void> showClockOutNotification({
+    required String title,
+    required String body,
+  }) async {
+    await _notificationService.showNotification(
+      title: title,
+      body: body,
+      id: _clockOutNotificationId,
+    );
+  }
+
+  /// Shows a notification when the worker leaves the geofence.
+  Future<void> showLeftGeofenceNotification({
+    required String title,
+    required String body,
+  }) async {
+    await _notificationService.showNotification(
+      title: title,
+      body: body,
+      id: leftGeofenceNotificationId,
+    );
+  }
+}

apps/mobile/packages/features/staff/clock_in/lib/src/data/services/geofence_service_impl.dart

@@ -40,7 +40,7 @@ class GeofenceServiceImpl implements GeofenceServiceInterface {
     double radiusMeters = 500,
   }) {
     return _locationService.watchLocation(distanceFilter: 10).map(
-          (location) => _buildResult(
+          (DeviceLocation location) => _buildResult(
             location: location,
             targetLat: targetLat,
             targetLng: targetLng,
@@ -57,7 +57,7 @@ class GeofenceServiceImpl implements GeofenceServiceInterface {
     Duration timeout = const Duration(seconds: 30),
   }) async {
     try {
-      final location =
+      final DeviceLocation location =
           await _locationService.getCurrentLocation().timeout(timeout);
       return _buildResult(
         location: location,
@@ -92,15 +92,15 @@ class GeofenceServiceImpl implements GeofenceServiceInterface {
     required double targetLng,
     required double radiusMeters,
   }) {
-    final distance = calculateDistance(
+    final double distance = calculateDistance(
       location.latitude,
       location.longitude,
       targetLat,
       targetLng,
     );
 
-    final isWithin = debugAlwaysInRange || distance <= radiusMeters;
-    final eta =
+    final bool isWithin = debugAlwaysInRange || distance <= radiusMeters;
+    final int eta =
         isWithin ? 0 : (distance / _walkingSpeedMetersPerMinute).round();
 
     return GeofenceResult(

apps/mobile/packages/features/staff/clock_in/lib/src/domain/models/geofence_result.dart

@@ -3,6 +3,14 @@ import 'package:krow_domain/krow_domain.dart';
 
 /// Result of a geofence proximity check.
 class GeofenceResult extends Equatable {
+  /// Creates a [GeofenceResult] instance.
+  const GeofenceResult({
+    required this.distanceMeters,
+    required this.isWithinRadius,
+    required this.estimatedEtaMinutes,
+    required this.location,
+  });
+
   /// Distance from the target location in meters.
   final double distanceMeters;
 
@@ -15,16 +23,8 @@ class GeofenceResult extends Equatable {
   /// The device location at the time of the check.
   final DeviceLocation location;
 
-  /// Creates a [GeofenceResult] instance.
-  const GeofenceResult({
-    required this.distanceMeters,
-    required this.isWithinRadius,
-    required this.estimatedEtaMinutes,
-    required this.location,
-  });
-
   @override
-  List<Object?> get props => [
+  List<Object?> get props => <Object?>[
         distanceMeters,
         isWithinRadius,
         estimatedEtaMinutes,

apps/mobile/packages/features/staff/clock_in/lib/src/domain/validators/clock_in_validation_context.dart

@@ -0,0 +1,55 @@
+import 'package:equatable/equatable.dart';
+
+/// Immutable input context carrying all data needed for clock-in validation.
+///
+/// Constructed by the presentation layer and passed through the validation
+/// pipeline so that each validator can inspect the fields it cares about.
+class ClockInValidationContext extends Equatable {
+  /// Creates a [ClockInValidationContext].
+  const ClockInValidationContext({
+    required this.isCheckingIn,
+    this.shiftStartTime,
+    this.shiftEndTime,
+    this.hasCoordinates = false,
+    this.isLocationVerified = false,
+    this.isLocationTimedOut = false,
+    this.isGeofenceOverridden = false,
+    this.overrideNotes,
+  });
+
+  /// Whether this is a clock-in attempt (`true`) or clock-out (`false`).
+  final bool isCheckingIn;
+
+  /// The scheduled start time of the shift, if known.
+  final DateTime? shiftStartTime;
+
+  /// The scheduled end time of the shift, if known.
+  final DateTime? shiftEndTime;
+
+  /// Whether the shift's venue has latitude/longitude coordinates.
+  final bool hasCoordinates;
+
+  /// Whether the device location has been verified against the geofence.
+  final bool isLocationVerified;
+
+  /// Whether the location check timed out before verification completed.
+  final bool isLocationTimedOut;
+
+  /// Whether the worker explicitly overrode the geofence via justification.
+  final bool isGeofenceOverridden;
+
+  /// Optional notes provided when overriding or timing out.
+  final String? overrideNotes;
+
+  @override
+  List<Object?> get props => <Object?>[
+        isCheckingIn,
+        shiftStartTime,
+        shiftEndTime,
+        hasCoordinates,
+        isLocationVerified,
+        isLocationTimedOut,
+        isGeofenceOverridden,
+        overrideNotes,
+      ];
+}

apps/mobile/packages/features/staff/clock_in/lib/src/domain/validators/clock_in_validation_result.dart

@@ -0,0 +1,24 @@
+import 'package:equatable/equatable.dart';
+
+/// The outcome of a single validation step in the clock-in pipeline.
+///
+/// Use the named constructors [ClockInValidationResult.valid] and
+/// [ClockInValidationResult.invalid] to create instances.
+class ClockInValidationResult extends Equatable {
+  /// Creates a passing validation result.
+  const ClockInValidationResult.valid()
+      : isValid = true,
+        errorKey = null;
+
+  /// Creates a failing validation result with the given [errorKey].
+  const ClockInValidationResult.invalid(this.errorKey) : isValid = false;
+
+  /// Whether the validation passed.
+  final bool isValid;
+
+  /// A localization key describing the validation failure, or `null` if valid.
+  final String? errorKey;
+
+  @override
+  List<Object?> get props => <Object?>[isValid, errorKey];
+}

apps/mobile/packages/features/staff/clock_in/lib/src/domain/validators/clock_in_validator.dart

@@ -0,0 +1,11 @@
+import 'clock_in_validation_context.dart';
+import 'clock_in_validation_result.dart';
+
+/// Abstract interface for a single step in the clock-in validation pipeline.
+///
+/// Implementations inspect the [ClockInValidationContext] and return a
+/// [ClockInValidationResult] indicating whether the check passed or failed.
+abstract class ClockInValidator {
+  /// Validates the given [context] and returns the result.
+  ClockInValidationResult validate(ClockInValidationContext context);
+}

apps/mobile/packages/features/staff/clock_in/lib/src/domain/validators/composite_clock_in_validator.dart

@@ -0,0 +1,27 @@
+import 'clock_in_validation_context.dart';
+import 'clock_in_validation_result.dart';
+import 'clock_in_validator.dart';
+
+/// Runs a list of [ClockInValidator]s in order, short-circuiting on first failure.
+///
+/// This implements the composite pattern to chain multiple validation rules
+/// into a single pipeline. Validators are executed sequentially and the first
+/// failing result is returned immediately.
+class CompositeClockInValidator implements ClockInValidator {
+
+  /// Creates a [CompositeClockInValidator] with the given [validators].
+  const CompositeClockInValidator(this.validators);
+  /// The ordered list of validators to execute.
+  final List<ClockInValidator> validators;
+
+  /// Runs each validator in order. Returns the first failing result,
+  /// or [ClockInValidationResult.valid] if all pass.
+  @override
+  ClockInValidationResult validate(ClockInValidationContext context) {
+    for (final ClockInValidator validator in validators) {
+      final ClockInValidationResult result = validator.validate(context);
+      if (!result.isValid) return result;
+    }
+    return const ClockInValidationResult.valid();
+  }
+}

apps/mobile/packages/features/staff/clock_in/lib/src/domain/validators/geofence_validator.dart

@@ -0,0 +1,35 @@
+import 'clock_in_validation_context.dart';
+import 'clock_in_validation_result.dart';
+import 'clock_in_validator.dart';
+
+/// Validates that geofence requirements are satisfied before clock-in.
+///
+/// Only applies when checking in to a shift that has venue coordinates.
+/// If the shift has no coordinates or this is a clock-out, validation passes.
+///
+/// Logic extracted from [ClockInBloc._onCheckIn]:
+/// - If the shift requires location verification but the geofence has not
+///   confirmed proximity, has not timed out, and the worker has not
+///   explicitly overridden via the justification modal, the attempt is rejected.
+class GeofenceValidator implements ClockInValidator {
+  /// Creates a [GeofenceValidator].
+  const GeofenceValidator();
+
+  /// Returns invalid when clocking in to a location-based shift without
+  /// verified location, timeout, or explicit override.
+  @override
+  ClockInValidationResult validate(ClockInValidationContext context) {
+    // Only applies to clock-in for shifts with coordinates.
+    if (!context.isCheckingIn || !context.hasCoordinates) {
+      return const ClockInValidationResult.valid();
+    }
+
+    if (!context.isLocationVerified &&
+        !context.isLocationTimedOut &&
+        !context.isGeofenceOverridden) {
+      return const ClockInValidationResult.invalid('geofence_not_verified');
+    }
+
+    return const ClockInValidationResult.valid();
+  }
+}

apps/mobile/packages/features/staff/clock_in/lib/src/domain/validators/override_notes_validator.dart

@@ -0,0 +1,35 @@
+import 'clock_in_validation_context.dart';
+import 'clock_in_validation_result.dart';
+import 'clock_in_validator.dart';
+
+/// Validates that override notes are provided when required.
+///
+/// When the location check timed out or the geofence was explicitly overridden,
+/// the worker must supply non-empty notes explaining why they are clocking in
+/// without verified proximity.
+///
+/// Logic extracted from [ClockInBloc._onCheckIn] notes check.
+class OverrideNotesValidator implements ClockInValidator {
+  /// Creates an [OverrideNotesValidator].
+  const OverrideNotesValidator();
+
+  /// Returns invalid if notes are required but missing or empty.
+  @override
+  ClockInValidationResult validate(ClockInValidationContext context) {
+    // Only applies to clock-in attempts.
+    if (!context.isCheckingIn) {
+      return const ClockInValidationResult.valid();
+    }
+
+    final bool notesRequired =
+        context.isLocationTimedOut || context.isGeofenceOverridden;
+
+    if (notesRequired &&
+        (context.overrideNotes == null ||
+            context.overrideNotes!.trim().isEmpty)) {
+      return const ClockInValidationResult.invalid('notes_required');
+    }
+
+    return const ClockInValidationResult.valid();
+  }
+}

apps/mobile/packages/features/staff/clock_in/lib/src/domain/validators/time_window_validator.dart

@@ -0,0 +1,77 @@
+import 'package:intl/intl.dart';
+
+import 'clock_in_validation_context.dart';
+import 'clock_in_validation_result.dart';
+import 'clock_in_validator.dart';
+
+/// Validates that the current time falls within the allowed window.
+///
+/// - For clock-in: the current time must be at most 15 minutes before the
+///   shift start time.
+/// - For clock-out: the current time must be at most 15 minutes before the
+///   shift end time.
+/// - If the relevant shift time is `null`, validation passes (don't block
+///   when the time is unknown).
+class TimeWindowValidator implements ClockInValidator {
+  /// Creates a [TimeWindowValidator].
+  const TimeWindowValidator();
+
+  /// The number of minutes before the shift time that the action is allowed.
+  static const int _earlyWindowMinutes = 15;
+
+  /// Returns invalid if the current time is too early for the action.
+  @override
+  ClockInValidationResult validate(ClockInValidationContext context) {
+    if (context.isCheckingIn) {
+      return _validateClockIn(context);
+    }
+    return _validateClockOut(context);
+  }
+
+  /// Validates the clock-in time window against [shiftStartTime].
+  ClockInValidationResult _validateClockIn(ClockInValidationContext context) {
+    final DateTime? shiftStart = context.shiftStartTime;
+    if (shiftStart == null) {
+      return const ClockInValidationResult.valid();
+    }
+
+    final DateTime windowStart = shiftStart.subtract(
+      const Duration(minutes: _earlyWindowMinutes),
+    );
+
+    if (DateTime.now().isBefore(windowStart)) {
+      return const ClockInValidationResult.invalid('too_early_clock_in');
+    }
+
+    return const ClockInValidationResult.valid();
+  }
+
+  /// Validates the clock-out time window against [shiftEndTime].
+  ClockInValidationResult _validateClockOut(ClockInValidationContext context) {
+    final DateTime? shiftEnd = context.shiftEndTime;
+    if (shiftEnd == null) {
+      return const ClockInValidationResult.valid();
+    }
+
+    final DateTime windowStart = shiftEnd.subtract(
+      const Duration(minutes: _earlyWindowMinutes),
+    );
+
+    if (DateTime.now().isBefore(windowStart)) {
+      return const ClockInValidationResult.invalid('too_early_clock_out');
+    }
+
+    return const ClockInValidationResult.valid();
+  }
+
+  /// Returns the formatted earliest allowed time for the given [shiftTime].
+  ///
+  /// The result is a 12-hour string such as "8:45 AM". Presentation code
+  /// can call this directly without depending on Flutter's [BuildContext].
+  static String getAvailabilityTime(DateTime shiftTime) {
+    final DateTime windowStart = shiftTime.subtract(
+      const Duration(minutes: _earlyWindowMinutes),
+    );
+    return DateFormat('h:mm a').format(windowStart);
+  }
+}

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/bloc/clock_in/clock_in_bloc.dart

@@ -8,25 +8,39 @@ import '../../../domain/usecases/clock_in_usecase.dart';
 import '../../../domain/usecases/clock_out_usecase.dart';
 import '../../../domain/usecases/get_attendance_status_usecase.dart';
 import '../../../domain/usecases/get_todays_shift_usecase.dart';
+import '../../../domain/validators/clock_in_validation_context.dart';
+import '../../../domain/validators/clock_in_validation_result.dart';
+import '../../../domain/validators/composite_clock_in_validator.dart';
+import '../geofence/geofence_bloc.dart';
+import '../geofence/geofence_event.dart';
+import '../geofence/geofence_state.dart';
 import 'clock_in_event.dart';
 import 'clock_in_state.dart';
 
 /// BLoC responsible for clock-in/clock-out operations and shift management.
 ///
-/// Location and geofence concerns are delegated to [GeofenceBloc].
-/// The UI bridges geofence state into [CheckInRequested] event parameters.
+/// Reads [GeofenceBloc] state directly to evaluate geofence conditions,
+/// removing the need for the UI to bridge geofence fields into events.
+/// Validation is delegated to [CompositeClockInValidator].
+/// Background tracking lifecycle is managed here after successful
+/// clock-in/clock-out, rather than in the UI layer.
 class ClockInBloc extends Bloc<ClockInEvent, ClockInState>
     with BlocErrorHandler<ClockInState> {
-  /// Creates a [ClockInBloc] with the required use cases.
+  /// Creates a [ClockInBloc] with the required use cases, geofence BLoC,
+  /// and validator.
   ClockInBloc({
     required GetTodaysShiftUseCase getTodaysShift,
     required GetAttendanceStatusUseCase getAttendanceStatus,
     required ClockInUseCase clockIn,
     required ClockOutUseCase clockOut,
+    required GeofenceBloc geofenceBloc,
+    required CompositeClockInValidator validator,
   })  : _getTodaysShift = getTodaysShift,
         _getAttendanceStatus = getAttendanceStatus,
         _clockIn = clockIn,
         _clockOut = clockOut,
+        _geofenceBloc = geofenceBloc,
+        _validator = validator,
         super(ClockInState(selectedDate: DateTime.now())) {
     on<ClockInPageLoaded>(_onLoaded);
     on<ShiftSelected>(_onShiftSelected);
@@ -43,6 +57,12 @@ class ClockInBloc extends Bloc<ClockInEvent, ClockInState>
   final ClockInUseCase _clockIn;
   final ClockOutUseCase _clockOut;
 
+  /// Reference to [GeofenceBloc] for reading geofence state directly.
+  final GeofenceBloc _geofenceBloc;
+
+  /// Composite validator for clock-in preconditions.
+  final CompositeClockInValidator _validator;
+
   /// Loads today's shifts and the current attendance status.
   Future<void> _onLoaded(
     ClockInPageLoaded event,
@@ -106,41 +126,38 @@ class ClockInBloc extends Bloc<ClockInEvent, ClockInState>
 
   /// Handles a clock-in request.
   ///
-  /// Geofence state is passed via event parameters from the UI layer:
-  /// - If the shift has a venue (lat/lng) and location is neither verified
-  ///   nor timed out, the clock-in is rejected.
-  /// - If the location timed out, notes are required to proceed.
-  /// - Otherwise the clock-in proceeds normally.
+  /// Reads geofence state directly from [_geofenceBloc] and builds a
+  /// [ClockInValidationContext] to run through the [_validator] pipeline.
+  /// On success, dispatches [BackgroundTrackingStarted] to [_geofenceBloc].
   Future<void> _onCheckIn(
     CheckInRequested event,
     Emitter<ClockInState> emit,
   ) async {
     final Shift? shift = state.selectedShift;
-    final bool shiftHasLocation =
+    final GeofenceState geofenceState = _geofenceBloc.state;
+
+    final bool hasCoordinates =
         shift != null && shift.latitude != null && shift.longitude != null;
 
-    // If the shift requires location verification but geofence has not
-    // confirmed proximity, has not timed out, and the worker has not
-    // explicitly overridden via the justification modal, reject the attempt.
-    if (shiftHasLocation &&
-        !event.isLocationVerified &&
-        !event.isLocationTimedOut &&
-        !event.isGeofenceOverridden) {
-      emit(state.copyWith(
-        status: ClockInStatus.failure,
-        errorMessage: 'errors.clock_in.location_verification_required',
-      ));
-      return;
-    }
+    // Build validation context from combined BLoC states.
+    final ClockInValidationContext validationContext = ClockInValidationContext(
+      isCheckingIn: true,
+      shiftStartTime: _tryParseDateTime(shift?.startTime),
+      shiftEndTime: _tryParseDateTime(shift?.endTime),
+      hasCoordinates: hasCoordinates,
+      isLocationVerified: geofenceState.isLocationVerified,
+      isLocationTimedOut: geofenceState.isLocationTimedOut,
+      isGeofenceOverridden: geofenceState.isGeofenceOverridden,
+      overrideNotes: event.notes,
+    );
 
-    // When location timed out or geofence is overridden, require the user to
-    // provide notes explaining why they are clocking in without verified
-    // proximity.
-    if ((event.isLocationTimedOut || event.isGeofenceOverridden) &&
-        (event.notes == null || event.notes!.trim().isEmpty)) {
+    final ClockInValidationResult validationResult =
+        _validator.validate(validationContext);
+
+    if (!validationResult.isValid) {
       emit(state.copyWith(
         status: ClockInStatus.failure,
-        errorMessage: 'errors.clock_in.notes_required_for_timeout',
+        errorMessage: validationResult.errorKey,
       ));
       return;
     }
@@ -156,6 +173,12 @@ class ClockInBloc extends Bloc<ClockInEvent, ClockInState>
           status: ClockInStatus.success,
           attendance: newStatus,
         ));
+
+        // Start background tracking after successful clock-in.
+        _dispatchBackgroundTrackingStarted(
+          event: event,
+          activeShiftId: newStatus.activeShiftId,
+        );
       },
       onError: (String errorKey) => state.copyWith(
         status: ClockInStatus.failure,
@@ -165,6 +188,8 @@ class ClockInBloc extends Bloc<ClockInEvent, ClockInState>
   }
 
   /// Handles a clock-out request.
+  ///
+  /// On success, dispatches [BackgroundTrackingStopped] to [_geofenceBloc].
   Future<void> _onCheckOut(
     CheckOutRequested event,
     Emitter<ClockInState> emit,
@@ -184,6 +209,14 @@ class ClockInBloc extends Bloc<ClockInEvent, ClockInState>
           status: ClockInStatus.success,
           attendance: newStatus,
         ));
+
+        // Stop background tracking after successful clock-out.
+        _geofenceBloc.add(
+          BackgroundTrackingStopped(
+            clockOutTitle: event.clockOutTitle,
+            clockOutBody: event.clockOutBody,
+          ),
+        );
       },
       onError: (String errorKey) => state.copyWith(
         status: ClockInStatus.failure,
@@ -191,4 +224,33 @@ class ClockInBloc extends Bloc<ClockInEvent, ClockInState>
       ),
     );
   }
+
+  /// Safely parses a time string into a [DateTime], returning `null` on failure.
+  static DateTime? _tryParseDateTime(String? value) {
+    if (value == null || value.isEmpty) return null;
+    return DateTime.tryParse(value);
+  }
+
+  /// Dispatches [BackgroundTrackingStarted] to [_geofenceBloc] if the
+  /// geofence has target coordinates.
+  void _dispatchBackgroundTrackingStarted({
+    required CheckInRequested event,
+    required String? activeShiftId,
+  }) {
+    final GeofenceState geofenceState = _geofenceBloc.state;
+
+    if (geofenceState.targetLat != null &&
+        geofenceState.targetLng != null &&
+        activeShiftId != null) {
+      _geofenceBloc.add(
+        BackgroundTrackingStarted(
+          shiftId: activeShiftId,
+          targetLat: geofenceState.targetLat!,
+          targetLng: geofenceState.targetLng!,
+          greetingTitle: event.clockInGreetingTitle,
+          greetingBody: event.clockInGreetingBody,
+        ),
+      );
+    }
+  }
 }

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/bloc/clock_in/clock_in_event.dart

@@ -36,45 +36,46 @@ class DateSelected extends ClockInEvent {
 
 /// Emitted when the user requests to clock in.
 ///
-/// [isLocationVerified] and [isLocationTimedOut] are provided by the UI layer
-/// from the GeofenceBloc state, bridging the two BLoCs.
+/// Geofence state is read directly by the BLoC from [GeofenceBloc],
+/// so this event only carries the shift ID, optional notes, and
+/// notification strings for background tracking.
 class CheckInRequested extends ClockInEvent {
   const CheckInRequested({
     required this.shiftId,
     this.notes,
-    this.isLocationVerified = false,
-    this.isLocationTimedOut = false,
-    this.isGeofenceOverridden = false,
+    this.clockInGreetingTitle = '',
+    this.clockInGreetingBody = '',
   });
 
   /// The ID of the shift to clock into.
   final String shiftId;
 
-  /// Optional notes provided by the user.
+  /// Optional notes provided by the user (e.g. geofence override notes).
   final String? notes;
 
-  /// Whether the geofence verification passed (user is within radius).
-  final bool isLocationVerified;
+  /// Localized title for the clock-in greeting notification.
+  final String clockInGreetingTitle;
 
-  /// Whether the geofence verification timed out (GPS unavailable).
-  final bool isLocationTimedOut;
-
-  /// Whether the worker explicitly overrode geofence via the justification modal.
-  final bool isGeofenceOverridden;
+  /// Localized body for the clock-in greeting notification.
+  final String clockInGreetingBody;
 
   @override
   List<Object?> get props => <Object?>[
         shiftId,
         notes,
-        isLocationVerified,
-        isLocationTimedOut,
-        isGeofenceOverridden,
+        clockInGreetingTitle,
+        clockInGreetingBody,
       ];
 }
 
 /// Emitted when the user requests to clock out.
 class CheckOutRequested extends ClockInEvent {
-  const CheckOutRequested({this.notes, this.breakTimeMinutes});
+  const CheckOutRequested({
+    this.notes,
+    this.breakTimeMinutes,
+    this.clockOutTitle = '',
+    this.clockOutBody = '',
+  });
 
   /// Optional notes provided by the user.
   final String? notes;
@@ -82,8 +83,19 @@ class CheckOutRequested extends ClockInEvent {
   /// Break time taken during the shift, in minutes.
   final int? breakTimeMinutes;
 
+  /// Localized title for the clock-out notification.
+  final String clockOutTitle;
+
+  /// Localized body for the clock-out notification.
+  final String clockOutBody;
+
   @override
-  List<Object?> get props => <Object?>[notes, breakTimeMinutes];
+  List<Object?> get props => <Object?>[
+        notes,
+        breakTimeMinutes,
+        clockOutTitle,
+        clockOutBody,
+      ];
 }
 
 /// Emitted when the user changes the check-in mode (e.g. swipe vs tap).

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/bloc/geofence/geofence_bloc.dart

@@ -5,6 +5,7 @@ import 'package:krow_core/core.dart';
 import 'package:krow_domain/krow_domain.dart';
 
 import '../../../data/services/background_geofence_service.dart';
+import '../../../data/services/clock_in_notification_service.dart';
 import '../../../domain/models/geofence_result.dart';
 import '../../../domain/services/geofence_service_interface.dart';
 import 'geofence_event.dart';
@@ -23,8 +24,10 @@ class GeofenceBloc extends Bloc<GeofenceEvent, GeofenceState>
   GeofenceBloc({
     required GeofenceServiceInterface geofenceService,
     required BackgroundGeofenceService backgroundGeofenceService,
+    required ClockInNotificationService notificationService,
   })  : _geofenceService = geofenceService,
         _backgroundGeofenceService = backgroundGeofenceService,
+        _notificationService = notificationService,
         super(const GeofenceState.initial()) {
     on<GeofenceStarted>(_onStarted);
     on<GeofenceResultUpdated>(_onResultUpdated);
@@ -42,6 +45,9 @@ class GeofenceBloc extends Bloc<GeofenceEvent, GeofenceState>
   /// The background service for periodic tracking while clocked in.
   final BackgroundGeofenceService _backgroundGeofenceService;
 
+  /// The notification service for clock-in related notifications.
+  final ClockInNotificationService _notificationService;
+
   /// Active subscription to the foreground geofence location stream.
   StreamSubscription<GeofenceResult>? _geofenceSubscription;
 
@@ -64,7 +70,7 @@ class GeofenceBloc extends Bloc<GeofenceEvent, GeofenceState>
       emit: emit.call,
       action: () async {
         // Check permission first.
-        final permission = await _geofenceService.ensurePermission();
+        final LocationPermissionStatus permission = await _geofenceService.ensurePermission();
         emit(state.copyWith(permissionStatus: permission));
 
         if (permission == LocationPermissionStatus.denied ||
@@ -81,12 +87,12 @@ class GeofenceBloc extends Bloc<GeofenceEvent, GeofenceState>
         // Start monitoring location service status changes.
         await _serviceStatusSubscription?.cancel();
         _serviceStatusSubscription =
-            _geofenceService.watchServiceStatus().listen((isEnabled) {
+            _geofenceService.watchServiceStatus().listen((bool isEnabled) {
           add(GeofenceServiceStatusChanged(isEnabled));
         });
 
         // Get initial position with a 30s timeout.
-        final result = await _geofenceService.checkGeofenceWithTimeout(
+        final GeofenceResult? result = await _geofenceService.checkGeofenceWithTimeout(
           targetLat: event.targetLat,
           targetLng: event.targetLng,
         );
@@ -105,7 +111,7 @@ class GeofenceBloc extends Bloc<GeofenceEvent, GeofenceState>
               targetLng: event.targetLng,
             )
             .listen(
-              (result) => add(GeofenceResultUpdated(result)),
+              (GeofenceResult result) => add(GeofenceResultUpdated(result)),
             );
       },
       onError: (String errorKey) => state.copyWith(
@@ -172,7 +178,7 @@ class GeofenceBloc extends Bloc<GeofenceEvent, GeofenceState>
     await handleError(
       emit: emit.call,
       action: () async {
-        final result = await _geofenceService.checkGeofenceWithTimeout(
+        final GeofenceResult? result = await _geofenceService.checkGeofenceWithTimeout(
           targetLat: state.targetLat!,
           targetLng: state.targetLng!,
         );
@@ -199,7 +205,7 @@ class GeofenceBloc extends Bloc<GeofenceEvent, GeofenceState>
       emit: emit.call,
       action: () async {
         // Request upgrade to "Always" permission for background tracking.
-        final permission = await _geofenceService.requestAlwaysPermission();
+        final LocationPermissionStatus permission = await _geofenceService.requestAlwaysPermission();
         emit(state.copyWith(permissionStatus: permission));
 
         // Start background tracking regardless (degrades gracefully).
@@ -210,7 +216,7 @@ class GeofenceBloc extends Bloc<GeofenceEvent, GeofenceState>
         );
 
         // Show greeting notification using localized strings from the UI.
-        await _backgroundGeofenceService.showClockInGreetingNotification(
+        await _notificationService.showClockInGreeting(
           title: event.greetingTitle,
           body: event.greetingBody,
         );
@@ -235,7 +241,7 @@ class GeofenceBloc extends Bloc<GeofenceEvent, GeofenceState>
         await _backgroundGeofenceService.stopBackgroundTracking();
 
         // Show clock-out notification using localized strings from the UI.
-        await _backgroundGeofenceService.showClockOutNotification(
+        await _notificationService.showClockOutNotification(
           title: event.clockOutTitle,
           body: event.clockOutBody,
         );

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/bloc/geofence/geofence_event.dart

@@ -13,27 +13,27 @@ abstract class GeofenceEvent extends Equatable {
 
 /// Starts foreground geofence verification for a target location.
 class GeofenceStarted extends GeofenceEvent {
+  /// Creates a [GeofenceStarted] event.
+  const GeofenceStarted({required this.targetLat, required this.targetLng});
+
   /// Target latitude of the shift location.
   final double targetLat;
 
   /// Target longitude of the shift location.
   final double targetLng;
 
-  /// Creates a [GeofenceStarted] event.
-  const GeofenceStarted({required this.targetLat, required this.targetLng});
-
   @override
   List<Object?> get props => <Object?>[targetLat, targetLng];
 }
 
 /// Emitted when a new geofence result is received from the location stream.
 class GeofenceResultUpdated extends GeofenceEvent {
-  /// The latest geofence check result.
-  final GeofenceResult result;
-
   /// Creates a [GeofenceResultUpdated] event.
   const GeofenceResultUpdated(this.result);
 
+  /// The latest geofence check result.
+  final GeofenceResult result;
+
   @override
   List<Object?> get props => <Object?>[result];
 }
@@ -46,12 +46,12 @@ class GeofenceTimeoutReached extends GeofenceEvent {
 
 /// Emitted when the device location service status changes.
 class GeofenceServiceStatusChanged extends GeofenceEvent {
-  /// Whether location services are now enabled.
-  final bool isEnabled;
-
   /// Creates a [GeofenceServiceStatusChanged] event.
   const GeofenceServiceStatusChanged(this.isEnabled);
 
+  /// Whether location services are now enabled.
+  final bool isEnabled;
+
   @override
   List<Object?> get props => <Object?>[isEnabled];
 }
@@ -64,6 +64,15 @@ class GeofenceRetryRequested extends GeofenceEvent {
 
 /// Starts background tracking after successful clock-in.
 class BackgroundTrackingStarted extends GeofenceEvent {
+  /// Creates a [BackgroundTrackingStarted] event.
+  const BackgroundTrackingStarted({
+    required this.shiftId,
+    required this.targetLat,
+    required this.targetLng,
+    required this.greetingTitle,
+    required this.greetingBody,
+  });
+
   /// The shift ID being tracked.
   final String shiftId;
 
@@ -79,15 +88,6 @@ class BackgroundTrackingStarted extends GeofenceEvent {
   /// Localized greeting notification body passed from the UI layer.
   final String greetingBody;
 
-  /// Creates a [BackgroundTrackingStarted] event.
-  const BackgroundTrackingStarted({
-    required this.shiftId,
-    required this.targetLat,
-    required this.targetLng,
-    required this.greetingTitle,
-    required this.greetingBody,
-  });
-
   @override
   List<Object?> get props =>
       <Object?>[shiftId, targetLat, targetLng, greetingTitle, greetingBody];
@@ -95,30 +95,30 @@ class BackgroundTrackingStarted extends GeofenceEvent {
 
 /// Stops background tracking after clock-out.
 class BackgroundTrackingStopped extends GeofenceEvent {
-  /// Localized clock-out notification title passed from the UI layer.
-  final String clockOutTitle;
-
-  /// Localized clock-out notification body passed from the UI layer.
-  final String clockOutBody;
-
   /// Creates a [BackgroundTrackingStopped] event.
   const BackgroundTrackingStopped({
     required this.clockOutTitle,
     required this.clockOutBody,
   });
 
+  /// Localized clock-out notification title passed from the UI layer.
+  final String clockOutTitle;
+
+  /// Localized clock-out notification body passed from the UI layer.
+  final String clockOutBody;
+
   @override
   List<Object?> get props => <Object?>[clockOutTitle, clockOutBody];
 }
 
 /// Worker approved geofence override by providing justification notes.
 class GeofenceOverrideApproved extends GeofenceEvent {
-  /// The justification notes provided by the worker.
-  final String notes;
-
   /// Creates a [GeofenceOverrideApproved] event.
   const GeofenceOverrideApproved({required this.notes});
 
+  /// The justification notes provided by the worker.
+  final String notes;
+
   @override
   List<Object?> get props => <Object?>[notes];
 }

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/bloc/geofence/geofence_state.dart

@@ -3,7 +3,6 @@ import 'package:krow_domain/krow_domain.dart';
 
 /// State for the [GeofenceBloc].
 class GeofenceState extends Equatable {
-
   /// Creates a [GeofenceState] instance.
   const GeofenceState({
     this.permissionStatus,
@@ -19,6 +18,10 @@ class GeofenceState extends Equatable {
     this.targetLat,
     this.targetLng,
   });
+
+  /// Initial state before any geofence operations.
+  const GeofenceState.initial() : this();
+
   /// Current location permission status.
   final LocationPermissionStatus? permissionStatus;
 
@@ -55,9 +58,6 @@ class GeofenceState extends Equatable {
   /// Target longitude being monitored.
   final double? targetLng;
 
-  /// Initial state before any geofence operations.
-  const GeofenceState.initial() : this();
-
   /// Creates a copy with the given fields replaced.
   GeofenceState copyWith({
     LocationPermissionStatus? permissionStatus,

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/pages/clock_in_page.dart

@@ -29,8 +29,12 @@ class ClockInPage extends StatelessWidget {
       appBar: UiAppBar(title: i18n.title, showBackButton: false),
       body: MultiBlocProvider(
         providers: <BlocProvider<dynamic>>[
-          BlocProvider<ClockInBloc>.value(value: Modular.get<ClockInBloc>()),
-          BlocProvider<GeofenceBloc>.value(value: Modular.get<GeofenceBloc>()),
+          BlocProvider<GeofenceBloc>.value(
+            value: Modular.get<GeofenceBloc>(),
+          ),
+          BlocProvider<ClockInBloc>.value(
+            value: Modular.get<ClockInBloc>(),
+          ),
         ],
         child: BlocListener<ClockInBloc, ClockInState>(
           listenWhen: (ClockInState previous, ClockInState current) =>

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/strategies/check_in_interaction.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/widgets.dart';
+
+/// Interface for different clock-in/out interaction methods (swipe, NFC, etc.).
+///
+/// Each implementation encapsulates the UI and behavior for a specific
+/// check-in mode, allowing the action section to remain mode-agnostic.
+abstract class CheckInInteraction {
+  /// Unique identifier for this interaction mode (e.g. "swipe", "nfc").
+  String get mode;
+
+  /// Builds the action widget for this interaction method.
+  ///
+  /// The returned widget handles user interaction (swipe gesture, NFC tap,
+  /// etc.) and invokes [onCheckIn] or [onCheckOut] when the action completes.
+  Widget buildActionWidget({
+    required bool isCheckedIn,
+    required bool isDisabled,
+    required bool isLoading,
+    required VoidCallback onCheckIn,
+    required VoidCallback onCheckOut,
+  });
+}

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/strategies/nfc_check_in_interaction.dart

@@ -0,0 +1,118 @@
+import 'package:core_localization/core_localization.dart';
+import 'package:design_system/design_system.dart';
+import 'package:flutter/material.dart';
+
+import '../widgets/nfc_scan_dialog.dart';
+import 'check_in_interaction.dart';
+
+/// NFC-based check-in interaction that shows a tap button and scan dialog.
+///
+/// When tapped, presents the [showNfcScanDialog] and triggers [onCheckIn]
+/// or [onCheckOut] upon a successful scan.
+class NfcCheckInInteraction implements CheckInInteraction {
+  /// Creates an NFC check-in interaction.
+  const NfcCheckInInteraction();
+
+  @override
+  String get mode => 'nfc';
+
+  @override
+  Widget buildActionWidget({
+    required bool isCheckedIn,
+    required bool isDisabled,
+    required bool isLoading,
+    required VoidCallback onCheckIn,
+    required VoidCallback onCheckOut,
+  }) {
+    return _NfcCheckInButton(
+      isCheckedIn: isCheckedIn,
+      isDisabled: isDisabled,
+      isLoading: isLoading,
+      onCheckIn: onCheckIn,
+      onCheckOut: onCheckOut,
+    );
+  }
+}
+
+/// Tap button that launches the NFC scan dialog and triggers check-in/out.
+class _NfcCheckInButton extends StatelessWidget {
+  const _NfcCheckInButton({
+    required this.isCheckedIn,
+    required this.isDisabled,
+    required this.isLoading,
+    required this.onCheckIn,
+    required this.onCheckOut,
+  });
+
+  /// Whether the user is currently checked in.
+  final bool isCheckedIn;
+
+  /// Whether the button should be disabled (e.g. geofence blocking).
+  final bool isDisabled;
+
+  /// Whether a check-in/out action is in progress.
+  final bool isLoading;
+
+  /// Called after a successful NFC scan when checking in.
+  final VoidCallback onCheckIn;
+
+  /// Called after a successful NFC scan when checking out.
+  final VoidCallback onCheckOut;
+
+  @override
+  Widget build(BuildContext context) {
+    final TranslationsStaffClockInSwipeEn i18n =
+        Translations.of(context).staff.clock_in.swipe;
+    final Color baseColor = isCheckedIn ? UiColors.success : UiColors.primary;
+
+    return GestureDetector(
+      onTap: () => _handleTap(context),
+      child: Container(
+        height: 56,
+        decoration: BoxDecoration(
+          color: isDisabled ? UiColors.bgSecondary : baseColor,
+          borderRadius: UiConstants.radiusLg,
+          boxShadow: isDisabled
+              ? <BoxShadow>[]
+              : <BoxShadow>[
+                  BoxShadow(
+                    color: baseColor.withValues(alpha: 0.4),
+                    blurRadius: 25,
+                    offset: const Offset(0, 10),
+                    spreadRadius: -5,
+                  ),
+                ],
+        ),
+        child: Row(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            const Icon(UiIcons.wifi, color: UiColors.white),
+            const SizedBox(width: UiConstants.space3),
+            Text(
+              isLoading
+                  ? (isCheckedIn ? i18n.checking_out : i18n.checking_in)
+                  : (isCheckedIn ? i18n.nfc_checkout : i18n.nfc_checkin),
+              style: UiTypography.body1b.copyWith(
+                color: isDisabled ? UiColors.textDisabled : UiColors.white,
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  /// Opens the NFC scan dialog and triggers the appropriate callback on success.
+  Future<void> _handleTap(BuildContext context) async {
+    if (isLoading || isDisabled) return;
+
+    final bool scanned = await showNfcScanDialog(context);
+    if (scanned && context.mounted) {
+      if (isCheckedIn) {
+        onCheckOut();
+      } else {
+        onCheckIn();
+      }
+    }
+  }
+}

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/strategies/swipe_check_in_interaction.dart

@@ -0,0 +1,30 @@
+import 'package:flutter/widgets.dart';
+
+import '../widgets/swipe_to_check_in.dart';
+import 'check_in_interaction.dart';
+
+/// Swipe-based check-in interaction using the [SwipeToCheckIn] slider widget.
+class SwipeCheckInInteraction implements CheckInInteraction {
+  /// Creates a swipe check-in interaction.
+  const SwipeCheckInInteraction();
+
+  @override
+  String get mode => 'swipe';
+
+  @override
+  Widget buildActionWidget({
+    required bool isCheckedIn,
+    required bool isDisabled,
+    required bool isLoading,
+    required VoidCallback onCheckIn,
+    required VoidCallback onCheckOut,
+  }) {
+    return SwipeToCheckIn(
+      isCheckedIn: isCheckedIn,
+      isDisabled: isDisabled,
+      isLoading: isLoading,
+      onCheckIn: onCheckIn,
+      onCheckOut: onCheckOut,
+    );
+  }
+}

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/widgets/clock_in_action_section.dart

@@ -8,24 +8,25 @@ import 'package:krow_domain/krow_domain.dart';
 
 import '../bloc/clock_in/clock_in_bloc.dart';
 import '../bloc/clock_in/clock_in_event.dart';
-import '../bloc/clock_in/clock_in_state.dart';
 import '../bloc/geofence/geofence_bloc.dart';
-import '../bloc/geofence/geofence_event.dart';
 import '../bloc/geofence/geofence_state.dart';
-import 'clock_in_helpers.dart';
+import '../../domain/validators/clock_in_validation_context.dart';
+import '../../domain/validators/time_window_validator.dart';
+import '../strategies/check_in_interaction.dart';
+import '../strategies/nfc_check_in_interaction.dart';
+import '../strategies/swipe_check_in_interaction.dart';
 import 'early_check_in_banner.dart';
 import 'geofence_status_banner/geofence_status_banner.dart';
 import 'lunch_break_modal.dart';
-import 'nfc_scan_dialog.dart';
 import 'no_shifts_banner.dart';
 import 'shift_completed_banner.dart';
-import 'swipe_to_check_in.dart';
 
 /// Orchestrates which action widget is displayed based on the current state.
 ///
-/// Decides between the swipe-to-check-in slider, the early-arrival banner,
-/// the shift-completed banner, or the no-shifts placeholder. Also shows the
-/// [GeofenceStatusBanner] and manages background tracking lifecycle.
+/// Uses the [CheckInInteraction] strategy pattern to delegate the actual
+/// check-in/out UI to mode-specific implementations (swipe, NFC, etc.).
+/// Also shows the [GeofenceStatusBanner]. Background tracking lifecycle
+/// is managed by [ClockInBloc], not this widget.
 class ClockInActionSection extends StatelessWidget {
   /// Creates the action section.
   const ClockInActionSection({
@@ -37,6 +38,13 @@ class ClockInActionSection extends StatelessWidget {
     super.key,
   });
 
+  /// Available check-in interaction strategies keyed by mode identifier.
+  static const Map<String, CheckInInteraction> _interactions =
+      <String, CheckInInteraction>{
+    'swipe': SwipeCheckInInteraction(),
+    'nfc': NfcCheckInInteraction(),
+  };
+
   /// The currently selected shift, or null if none is selected.
   final Shift? selectedShift;
 
@@ -52,46 +60,14 @@ class ClockInActionSection extends StatelessWidget {
   /// Whether a check-in or check-out action is currently in progress.
   final bool isActionInProgress;
 
+  /// Resolves the [CheckInInteraction] for the current mode.
+  ///
+  /// Falls back to [SwipeCheckInInteraction] if the mode is unrecognized.
+  CheckInInteraction get _currentInteraction =>
+      _interactions[checkInMode] ?? const SwipeCheckInInteraction();
+
   @override
   Widget build(BuildContext context) {
-    return MultiBlocListener(
-      listeners: <BlocListener<dynamic, dynamic>>[
-        // Start background tracking after successful check-in.
-        BlocListener<ClockInBloc, ClockInState>(
-          listenWhen: (ClockInState previous, ClockInState current) {
-            return previous.status == ClockInStatus.actionInProgress &&
-                current.status == ClockInStatus.success &&
-                current.attendance.isCheckedIn &&
-                !previous.attendance.isCheckedIn;
-          },
-
-          listener: (BuildContext context, ClockInState state) {
-            _startBackgroundTracking(context, state);
-          },
-        ),
-        // Stop background tracking after clock-out.
-        BlocListener<ClockInBloc, ClockInState>(
-          listenWhen: (ClockInState previous, ClockInState current) =>
-              previous.attendance.isCheckedIn &&
-              !current.attendance.isCheckedIn,
-          listener: (BuildContext context, ClockInState _) {
-            final TranslationsStaffClockInGeofenceEn geofenceI18n =
-                Translations.of(context).staff.clock_in.geofence;
-            ReadContext(context).read<GeofenceBloc>().add(
-              BackgroundTrackingStopped(
-                clockOutTitle: geofenceI18n.clock_out_title,
-                clockOutBody: geofenceI18n.clock_out_body,
-              ),
-            );
-          },
-        ),
-      ],
-      child: _buildContent(context),
-    );
-  }
-
-  /// Builds the main content column with geofence banner and action widget.
-  Widget _buildContent(BuildContext context) {
     if (selectedShift != null && checkOutTime == null) {
       return _buildActiveShiftAction(context);
     }
@@ -105,14 +81,14 @@ class ClockInActionSection extends StatelessWidget {
 
   /// Builds the action widget for an active (not completed) shift.
   Widget _buildActiveShiftAction(BuildContext context) {
-    if (!isCheckedIn && !ClockInHelpers.isCheckInAllowed(selectedShift!)) {
+    if (!isCheckedIn && !_isCheckInAllowed(selectedShift!)) {
       return Column(
         mainAxisSize: MainAxisSize.min,
         children: <Widget>[
           const GeofenceStatusBanner(),
           const SizedBox(height: UiConstants.space3),
           EarlyCheckInBanner(
-            availabilityTime: ClockInHelpers.getCheckInAvailabilityTime(
+            availabilityTime: _getAvailabilityTimeText(
               selectedShift!,
               context,
             ),
@@ -138,11 +114,9 @@ class ClockInActionSection extends StatelessWidget {
           mainAxisSize: MainAxisSize.min,
           spacing: UiConstants.space4,
           children: <Widget>[
-            // Geofence status banner is shown even when not blocking to provide feedback
             const GeofenceStatusBanner(),
-            SwipeToCheckIn(
+            _currentInteraction.buildActionWidget(
               isCheckedIn: isCheckedIn,
-              mode: checkInMode,
               isDisabled: isGeofenceBlocking,
               isLoading: isActionInProgress,
               onCheckIn: () => _handleCheckIn(context),
@@ -154,76 +128,70 @@ class ClockInActionSection extends StatelessWidget {
     );
   }
 
-  /// Triggers the check-in flow, reading geofence state for location data.
-  Future<void> _handleCheckIn(BuildContext context) async {
+  /// Triggers the check-in flow, passing notification strings and
+  /// override notes from geofence state.
+  void _handleCheckIn(BuildContext context) {
     final GeofenceState geofenceState = ReadContext(
       context,
     ).read<GeofenceBloc>().state;
+    final TranslationsStaffClockInGeofenceEn geofenceI18n =
+        Translations.of(context).staff.clock_in.geofence;
 
-    if (checkInMode == 'nfc') {
-      final bool scanned = await showNfcScanDialog(context);
-      if (scanned && context.mounted) {
-        ReadContext(context).read<ClockInBloc>().add(
-          CheckInRequested(
-            shiftId: selectedShift!.id,
-            notes: geofenceState.overrideNotes,
-            isLocationVerified: geofenceState.isLocationVerified,
-            isLocationTimedOut: geofenceState.isLocationTimedOut,
-            isGeofenceOverridden: geofenceState.isGeofenceOverridden,
-          ),
-        );
-      }
-    } else {
-      ReadContext(context).read<ClockInBloc>().add(
-        CheckInRequested(
-          shiftId: selectedShift!.id,
-          notes: geofenceState.overrideNotes,
-          isLocationVerified: geofenceState.isLocationVerified,
-          isLocationTimedOut: geofenceState.isLocationTimedOut,
-          isGeofenceOverridden: geofenceState.isGeofenceOverridden,
-        ),
-      );
+    ReadContext(context).read<ClockInBloc>().add(
+      CheckInRequested(
+        shiftId: selectedShift!.id,
+        notes: geofenceState.overrideNotes,
+        clockInGreetingTitle: geofenceI18n.clock_in_greeting_title,
+        clockInGreetingBody: geofenceI18n.clock_in_greeting_body,
+      ),
+    );
+  }
+
+  /// Whether the user is allowed to check in for the given [shift].
+  ///
+  /// Delegates to [TimeWindowValidator]; returns `true` if the start time
+  /// cannot be parsed (don't block the user).
+  bool _isCheckInAllowed(Shift shift) {
+    final DateTime? shiftStart = DateTime.tryParse(shift.startTime);
+    if (shiftStart == null) return true;
+
+    final ClockInValidationContext validationContext = ClockInValidationContext(
+      isCheckingIn: true,
+      shiftStartTime: shiftStart,
+    );
+    return const TimeWindowValidator().validate(validationContext).isValid;
+  }
+
+  /// Returns the formatted earliest check-in time for the given [shift].
+  ///
+  /// Falls back to the localized "soon" label when the start time cannot
+  /// be parsed.
+  String _getAvailabilityTimeText(Shift shift, BuildContext context) {
+    final DateTime? shiftStart = DateTime.tryParse(shift.startTime.trim());
+    if (shiftStart != null) {
+      return TimeWindowValidator.getAvailabilityTime(shiftStart);
     }
+    return Translations.of(context).staff.clock_in.soon;
   }
 
   /// Triggers the check-out flow via the lunch-break confirmation dialog.
   void _handleCheckOut(BuildContext context) {
+    final TranslationsStaffClockInGeofenceEn geofenceI18n =
+        Translations.of(context).staff.clock_in.geofence;
+
     showDialog<void>(
       context: context,
       builder: (BuildContext dialogContext) => LunchBreakDialog(
         onComplete: () {
           Modular.to.popSafe();
-          ReadContext(
-            context,
-          ).read<ClockInBloc>().add(const CheckOutRequested());
+          ReadContext(context).read<ClockInBloc>().add(
+            CheckOutRequested(
+              clockOutTitle: geofenceI18n.clock_out_title,
+              clockOutBody: geofenceI18n.clock_out_body,
+            ),
+          );
         },
       ),
     );
   }
-
-  /// Dispatches [BackgroundTrackingStarted] if the geofence has target
-  /// coordinates after a successful check-in.
-  void _startBackgroundTracking(BuildContext context, ClockInState state) {
-    final GeofenceState geofenceState = ReadContext(
-      context,
-    ).read<GeofenceBloc>().state;
-
-    if (geofenceState.targetLat != null &&
-        geofenceState.targetLng != null &&
-        state.attendance.activeShiftId != null) {
-      final TranslationsStaffClockInGeofenceEn geofenceI18n = Translations.of(
-        context,
-      ).staff.clock_in.geofence;
-
-      ReadContext(context).read<GeofenceBloc>().add(
-        BackgroundTrackingStarted(
-          shiftId: state.attendance.activeShiftId!,
-          targetLat: geofenceState.targetLat!,
-          targetLng: geofenceState.targetLng!,
-          greetingTitle: geofenceI18n.clock_in_greeting_title,
-          greetingBody: geofenceI18n.clock_in_greeting_body,
-        ),
-      );
-    }
-  }
 }

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/widgets/clock_in_helpers.dart

@@ -1,78 +0,0 @@
-import 'package:core_localization/core_localization.dart';
-import 'package:flutter/material.dart';
-import 'package:intl/intl.dart';
-import 'package:krow_domain/krow_domain.dart';
-
-/// Pure utility functions shared across clock-in widgets.
-///
-/// These are stateless helpers that handle time formatting and
-/// shift check-in availability calculations.
-class ClockInHelpers {
-  const ClockInHelpers._();
-
-  /// Formats a time string (ISO 8601 or HH:mm) into a human-readable
-  /// 12-hour format (e.g. "9:00 AM").
-  static String formatTime(String timeStr) {
-    if (timeStr.isEmpty) return '';
-    try {
-      final DateTime dt = DateTime.parse(timeStr);
-      return DateFormat('h:mm a').format(dt);
-    } catch (_) {
-      try {
-        final List<String> parts = timeStr.split(':');
-        if (parts.length >= 2) {
-          final DateTime dt = DateTime(
-            2022,
-            1,
-            1,
-            int.parse(parts[0]),
-            int.parse(parts[1]),
-          );
-          return DateFormat('h:mm a').format(dt);
-        }
-        return timeStr;
-      } catch (e) {
-        return timeStr;
-      }
-    }
-  }
-
-  /// Whether the user is allowed to check in for the given [shift].
-  ///
-  /// Check-in is permitted 15 minutes before the shift start time.
-  /// Falls back to `true` if the start time cannot be parsed.
-  static bool isCheckInAllowed(Shift shift) {
-    try {
-      final DateTime shiftStart = DateTime.parse(shift.startTime);
-      final DateTime windowStart = shiftStart.subtract(
-        const Duration(minutes: 15),
-      );
-      return DateTime.now().isAfter(windowStart);
-    } catch (e) {
-      return true;
-    }
-  }
-
-  /// Returns the earliest time the user may check in for the given [shift],
-  /// formatted as a 12-hour string (e.g. "8:45 AM").
-  ///
-  /// Falls back to the localized "soon" label when the start time cannot
-  /// be parsed.
-  static String getCheckInAvailabilityTime(
-    Shift shift,
-    BuildContext context,
-  ) {
-    try {
-      final DateTime shiftStart = DateTime.parse(shift.startTime.trim());
-      final DateTime windowStart = shiftStart.subtract(
-        const Duration(minutes: 15),
-      );
-      return DateFormat('h:mm a').format(windowStart);
-    } catch (e) {
-      final TranslationsStaffClockInEn i18n = Translations.of(
-        context,
-      ).staff.clock_in;
-      return i18n.soon;
-    }
-  }
-}

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/widgets/shift_card.dart

@@ -3,7 +3,7 @@ import 'package:design_system/design_system.dart';
 import 'package:flutter/material.dart';
 import 'package:krow_domain/krow_domain.dart';
 
-import 'clock_in_helpers.dart';
+import 'package:krow_core/core.dart' show formatTime;
 
 /// A selectable card that displays a single shift's summary information.
 ///
@@ -110,7 +110,7 @@ class _ShiftTimeAndRate extends StatelessWidget {
       crossAxisAlignment: CrossAxisAlignment.end,
       children: <Widget>[
         Text(
-          '${ClockInHelpers.formatTime(shift.startTime)} - ${ClockInHelpers.formatTime(shift.endTime)}',
+          '${formatTime(shift.startTime)} - ${formatTime(shift.endTime)}',
           style: UiTypography.body3m.textSecondary,
         ),
         Text(

apps/mobile/packages/features/staff/clock_in/lib/src/presentation/widgets/swipe_to_check_in.dart

@@ -3,21 +3,35 @@ import 'package:core_localization/core_localization.dart';
 import 'package:design_system/design_system.dart';
 import 'package:flutter/material.dart';
 
+/// A swipe-to-confirm slider for clock-in and clock-out actions.
+///
+/// Displays a draggable handle that the user slides to the end to confirm
+/// check-in or check-out. This widget only handles the swipe interaction;
+/// NFC mode is handled by a separate [CheckInInteraction] strategy.
 class SwipeToCheckIn extends StatefulWidget {
+  /// Creates a swipe-to-check-in slider.
   const SwipeToCheckIn({
     super.key,
     this.onCheckIn,
     this.onCheckOut,
     this.isLoading = false,
-    this.mode = 'swipe',
     this.isCheckedIn = false,
     this.isDisabled = false,
   });
+
+  /// Called when the user completes the swipe to check in.
   final VoidCallback? onCheckIn;
+
+  /// Called when the user completes the swipe to check out.
   final VoidCallback? onCheckOut;
+
+  /// Whether a check-in/out action is currently in progress.
   final bool isLoading;
-  final String mode; // 'swipe' or 'nfc'
+
+  /// Whether the user is currently checked in.
   final bool isCheckedIn;
+
+  /// Whether the slider is disabled (e.g. geofence blocking).
   final bool isDisabled;
 
   @override
@@ -76,57 +90,6 @@ class _SwipeToCheckInState extends State<SwipeToCheckIn>
   @override
   Widget build(BuildContext context) {
     final TranslationsStaffClockInSwipeEn i18n = Translations.of(context).staff.clock_in.swipe;
-    final Color baseColor = widget.isCheckedIn
-        ? UiColors.success
-        : UiColors.primary;
-
-    if (widget.mode == 'nfc') {
-      return GestureDetector(
-        onTap: () {
-          if (widget.isLoading || widget.isDisabled) return;
-          // Simulate completion for NFC tap
-          Future.delayed(const Duration(milliseconds: 300), () {
-            if (widget.isCheckedIn) {
-              widget.onCheckOut?.call();
-            } else {
-              widget.onCheckIn?.call();
-            }
-          });
-        },
-        child: Container(
-          height: 56,
-          decoration: BoxDecoration(
-            color: widget.isDisabled ? UiColors.bgSecondary : baseColor,
-            borderRadius: UiConstants.radiusLg,
-            boxShadow: widget.isDisabled ? [] : <BoxShadow>[
-              BoxShadow(
-                color: baseColor.withValues(alpha: 0.4),
-                blurRadius: 25,
-                offset: const Offset(0, 10),
-                spreadRadius: -5,
-              ),
-            ],
-          ),
-          child: Row(
-            mainAxisAlignment: MainAxisAlignment.center,
-            children: <Widget>[
-              const Icon(UiIcons.wifi, color: UiColors.white),
-              const SizedBox(width: UiConstants.space3),
-              Text(
-                widget.isLoading
-                    ? (widget.isCheckedIn
-                          ? i18n.checking_out
-                          : i18n.checking_in)
-                    : (widget.isCheckedIn ? i18n.nfc_checkout : i18n.nfc_checkin),
-                style: UiTypography.body1b.copyWith(
-                  color: widget.isDisabled ? UiColors.textDisabled : UiColors.white,
-                ),
-              ),
-            ],
-          ),
-        ),
-      );
-    }
 
     return LayoutBuilder(
       builder: (BuildContext context, BoxConstraints constraints) {

apps/mobile/packages/features/staff/clock_in/lib/src/staff_clock_in_module.dart

@@ -4,6 +4,7 @@ import 'package:krow_core/core.dart';
 
 import 'data/repositories_impl/clock_in_repository_impl.dart';
 import 'data/services/background_geofence_service.dart';
+import 'data/services/clock_in_notification_service.dart';
 import 'data/services/geofence_service_impl.dart';
 import 'domain/repositories/clock_in_repository_interface.dart';
 import 'domain/services/geofence_service_interface.dart';
@@ -11,13 +12,18 @@ import 'domain/usecases/clock_in_usecase.dart';
 import 'domain/usecases/clock_out_usecase.dart';
 import 'domain/usecases/get_attendance_status_usecase.dart';
 import 'domain/usecases/get_todays_shift_usecase.dart';
+import 'domain/validators/clock_in_validator.dart';
+import 'domain/validators/composite_clock_in_validator.dart';
+import 'domain/validators/geofence_validator.dart';
+import 'domain/validators/override_notes_validator.dart';
+import 'domain/validators/time_window_validator.dart';
 import 'presentation/bloc/clock_in/clock_in_bloc.dart';
 import 'presentation/bloc/geofence/geofence_bloc.dart';
 import 'presentation/pages/clock_in_page.dart';
 
 /// Module for the staff clock-in feature.
 ///
-/// Registers repositories, use cases, geofence services, and BLoCs.
+/// Registers repositories, use cases, validators, geofence services, and BLoCs.
 class StaffClockInModule extends Module {
   @override
   List<Module> get imports => <Module>[CoreModule()];
@@ -36,23 +42,50 @@ class StaffClockInModule extends Module {
     i.add<BackgroundGeofenceService>(
       () => BackgroundGeofenceService(
         backgroundTaskService: i.get<BackgroundTaskService>(),
-        notificationService: i.get<NotificationService>(),
         storageService: i.get<StorageService>(),
       ),
     );
 
+    // Notification Service (clock-in / clock-out / geofence notifications)
+    i.add<ClockInNotificationService>(
+      () => ClockInNotificationService(
+        notificationService: i.get<NotificationService>(),
+      ),
+    );
+
     // Use Cases
     i.add<GetTodaysShiftUseCase>(GetTodaysShiftUseCase.new);
     i.add<GetAttendanceStatusUseCase>(GetAttendanceStatusUseCase.new);
     i.add<ClockInUseCase>(ClockInUseCase.new);
     i.add<ClockOutUseCase>(ClockOutUseCase.new);
 
-    // BLoCs (transient -- new instance per navigation)
-    i.add<ClockInBloc>(ClockInBloc.new);
-    i.add<GeofenceBloc>(
+    // Validators
+    i.addLazySingleton<CompositeClockInValidator>(
+      () => const CompositeClockInValidator(<ClockInValidator>[
+        GeofenceValidator(),
+        TimeWindowValidator(),
+        OverrideNotesValidator(),
+      ]),
+    );
+
+    // BLoCs
+    // GeofenceBloc is a lazy singleton so that ClockInBloc and the widget tree
+    // share the same instance within a navigation scope.
+    i.addLazySingleton<GeofenceBloc>(
       () => GeofenceBloc(
         geofenceService: i.get<GeofenceServiceInterface>(),
         backgroundGeofenceService: i.get<BackgroundGeofenceService>(),
+        notificationService: i.get<ClockInNotificationService>(),
+      ),
+    );
+    i.add<ClockInBloc>(
+      () => ClockInBloc(
+        getTodaysShift: i.get<GetTodaysShiftUseCase>(),
+        getAttendanceStatus: i.get<GetAttendanceStatusUseCase>(),
+        clockIn: i.get<ClockInUseCase>(),
+        clockOut: i.get<ClockOutUseCase>(),
+        geofenceBloc: i.get<GeofenceBloc>(),
+        validator: i.get<CompositeClockInValidator>(),
       ),
     );
   }