Scaffold Bulk Registration Screen with Role Gate
epic-proxy-activity-registration-ui-task-015 — Create the BulkRegistrationScreen route with coordinator role guard. Render the screen scaffold (AppBar, two-section layout: mentor selection at top, shared activity form below) and connect to ProxyRegistrationBloc for bulk mode initialization. Establish pre-filled defaults for date and duration using the BulkRegistrationDefaultsProvider.
Acceptance Criteria
Technical Requirements
Execution Context
Tier 14 - 3 tasks
Can start after Tier 13 completes
Implementation Notes
BulkRegistrationDefaultsProvider should be implemented as a Riverpod Provider (or simple singleton service) that reads from app-level configuration or user preferences — not hardcoded in the widget. Pass defaults into ProxyActivityForm via its initialValues parameter (add this parameter in task-010 if not already present). The two-section layout should use a single CustomScrollView with two SliverToBoxAdapter sections rather than a nested ListView to avoid scroll conflicts. The sticky bottom bar participant count ('X mentor(s) selected') must use BlocSelector scoped only to selectedMentorIds.length to avoid rebuilding the entire screen.
The 'Register for All' button label should also show the count: 'Register for 3 Mentors' — update label dynamically. This screen is architecturally the most complex in the epic; ensure the BLoC clearly distinguishes bulk mode from single-mentor mode via a mode enum in state, rather than using two separate BLoCs, to share submission and conflict-handling logic.
Testing Requirements
Widget tests (flutter_test): verify no-access state for peer mentor role (mock auth), verify two-section layout renders for coordinator role with correct section headers, verify LoadBulkRegistrationData event dispatched on mount (MockBloc), verify BulkRegistrationDefaultsProvider values pre-populate form fields (mock provider), verify loading state shows progress indicator, verify 'Register for All' button is disabled during loading, verify participant count label starts at '0 mentor(s) selected'. Unit tests: BLoC LoadBulkRegistrationData transition, BulkRegistrationDefaultsProvider default value logic. Accessibility test: verify section headers have Semantics(header: true), verify participant count has liveRegion: true. Integration test: navigate to route as coordinator, verify screen mounts without exceptions.
The bulk registration screen combines pre-filled defaults, a dynamic multi-select participant list, per-participant conflict badges, and a batch submission confirmation — making it one of the most complex screens in the application. Scope creep or underestimated interaction complexity could cause the epic to exceed its estimate significantly.
Mitigation & Contingency
Mitigation: Implement the bulk screen in two vertical slices: (1) participant selection and form submission without conflict handling, (2) conflict badge rendering and override flow. Validate slice 1 with coordinators before building slice 2.
Contingency: If the full conflict review UI cannot be completed within the epic, ship the bulk screen with a simplified 'skip all duplicates' fallback mode and defer per-participant override toggles to a follow-up sprint.
The proxy-registration-bloc must manage state across two distinct flows (single proxy and bulk) with branching conflict paths, intermediate buffering of bulk participant selections, and reliable state reset. Incorrect state transitions could leave the UI in a loading or stale-conflict state after submission.
Mitigation & Contingency
Mitigation: Model the BLoC state as a sealed class hierarchy with exhaustive pattern matching in the UI. Write state-machine unit tests that exercise every valid transition and assert that invalid transitions are no-ops. Use flutter_bloc's BlocObserver in debug builds to log all transitions.
Contingency: If BLoC state bugs surface in QA, introduce an explicit ResetToIdle event triggered on screen disposal to guarantee clean state, and add a 'Start over' affordance visible to the coordinator at any conflict step.
The typeahead peer mentor selector with multi-select mode may be difficult to operate with VoiceOver/TalkBack, particularly the dynamic search results list and the selected-chip removal controls, risking WCAG 2.2 AA non-compliance for screen reader users.
Mitigation & Contingency
Mitigation: Wrap all search result items and selected chips with explicit Semantics widgets providing role, label, and selected-state announcements. Test the selector with VoiceOver on iOS and TalkBack on Android during development, not only at QA time.
Contingency: If the multi-select typeahead cannot be made fully accessible within the sprint, provide an alternative flat scrollable list with checkboxes as a fallback mode, toggled by an accessibility-settings flag.
The peer mentor selector must apply RLS chapter-scope filtering to show only mentors the coordinator is responsible for. If the Supabase query for the selector does not correctly join against the coordinator's chapter assignments, coordinators may see mentors from other chapters, violating data isolation.
Mitigation & Contingency
Mitigation: Implement the selector's data query using the same RLS-aware Supabase client used by the contact list feature, which already handles chapter-scope filtering. Write an integration test with a multi-chapter coordinator fixture asserting cross-chapter mentors are not returned.
Contingency: If a data isolation breach is discovered, immediately add a client-side chapter_id filter as a defence-in-depth measure and audit selector query logs for any unauthorised cross-chapter results.