Implement Role-Based Home Screen scaffold
epic-role-based-access-control-ui-and-navigation-task-001 — Create the RoleBasedHomeScreen widget that subscribes to the Role State Manager stream and conditionally renders one of three content variants (coordinator, peer mentor, org admin) based on the active role. Implement the widget tree structure, state subscription, and role-variant switching logic using BLoC/Riverpod pattern.
Acceptance Criteria
Technical Requirements
Implementation Notes
Implement RoleBasedHomeScreen as a stateless widget wrapping a BlocBuilder
Follow the existing AppButton and page header reusable widget patterns from the shared component library.
Testing Requirements
Widget tests using flutter_test. Test each RoleState → rendered variant mapping using pumpWidget with a mocked/fake RoleStateManager providing a controlled stream. Assert correct widget type is present in the tree for each state using find.byType. Test role switch: pump initial state, emit new role state, call pumpAndSettle, assert new variant.
Test redirect behavior for globalAdmin and unauthenticated states using a NavigatorObserver mock. Aim for 100% branch coverage of the role-dispatch switch/if logic.
Combining GoRouter's declarative redirect logic in the route guard with StatefulShellRoute's stateful branch management is known to produce subtle bugs where the shell rebuilds unnecessarily on role switches, losing tab state or causing double-navigation events.
Mitigation & Contingency
Mitigation: Implement the route guard as a GoRouter redirect callback that only evaluates role from an already-resolved Riverpod provider (not async). Use a dedicated ShellRoute navigator key per tab branch to anchor state independently of role-driven rebuilds. Write integration tests for the full navigation graph.
Contingency: If StatefulShellRoute state loss is confirmed during QA, fall back to a manual tab state preservation approach using a TabStateManager service that caches the last route per tab and restores it after role switches, decoupling tab state from the shell lifecycle.
The role-based home screen must render three significantly different layouts (coordinator dashboard, peer mentor activity summary, org admin overview). If these variants are implemented as a single widget with conditionals, the file will become unmaintainable and difficult to test in isolation, especially as each variant grows with downstream feature additions.
Mitigation & Contingency
Mitigation: Design the role-based home screen as a router/dispatcher widget that delegates to three separate variant widgets (CoordinatorHomeView, PeerMentorHomeView, OrgAdminHomeView). Each variant is independently testable and can be developed by separate team members in parallel.
Contingency: If variant coupling has already occurred before this risk is addressed, refactor to the dispatcher pattern in a dedicated cleanup task before feature handoff. The dispatcher pattern is a straightforward extraction that carries low refactoring risk.
The no-access screen must link global admin users to the correct admin portal URL, which may differ per organization (NHF, HLF, Blindeforbundet each have their own admin portals). Hardcoding a single URL will result in wrong or broken links for some global admin users.
Mitigation & Contingency
Mitigation: Source the admin portal URL from the organization's configuration record in Supabase rather than hardcoding it. The no-access screen reads the active org context and resolves the portal URL dynamically. Provide a safe fallback to a generic Norse Digital Products support page if the URL is not configured.
Contingency: If dynamic URL resolution is not ready when the no-access screen ships, display a static instruction to contact the organization's administrator along with a support email address as an interim measure, and track the URL configuration task as a follow-up.