---
phase: 01-authentication
plan: 04
subsystem: auth
tags: [supabase, flutter, riverpod, authentication, state-management]

# Dependency graph
requires:
  - phase: 01-authentication
    provides: AuthRepository interface, AuthUser model, custom exception hierarchy
provides:
  - Supabase authentication repository implementation
  - Global authentication state management with Riverpod
  - Auth state persistence across app restarts
  - Automatic UI updates on auth state changes
affects: [01-05-router-integration, 02-household-creation]

# Tech tracking
tech-stack:
  added: []
  patterns: [repository-pattern, state-management, clean-architecture, dependency-injection]

key-files:
  created: 
    - lib/features/authentication/data/repositories/auth_repository_impl.dart
    - lib/providers/auth_provider.dart
  modified: []

key-decisions:
  - "Used Riverpod for state management (flutter_riverpod package already in dependencies)"
  - "Implemented complete AuthRepository interface with all required methods"
  - "Created AuthState class with loading, error, and user management"
  - "Added convenience providers for common auth state access patterns"

patterns-established:
  - "Pattern 1: Repository implementation with comprehensive error mapping"
  - "Pattern 2: StateNotifier pattern for global state management"
  - "Pattern 3: Provider composition for granular state access"

# Metrics
duration: 8 min
completed: 2026-01-28
---

# Phase 1 Plan 04: Auth Repository and State Management Summary

**Supabase authentication repository with Riverpod global state management, implementing complete auth interface with automatic UI updates**

## Performance

- **Duration:** 8 min
- **Started:** 2026-01-28T15:33:07Z
- **Completed:** 2026-01-28T15:40:45Z
- **Tasks:** 2
- **Files modified:** 2

## Accomplishments
- Complete AuthRepository implementation using Supabase authentication methods
- Global authentication state management with Riverpod StateNotifier
- Automatic UI updates through auth state change streams
- Comprehensive error handling with custom exception mapping
- Loading state management for all authentication operations

## Task Commits

Each task was committed atomically:

1. **Task 1: Implement AuthRepository with Supabase** - `294d537` (feat)
2. **Task 2: Create AuthProvider for state management** - `f3397a9` (feat)

**Plan metadata:** (will be committed with summary)

## Files Created/Modified

- `lib/features/authentication/data/repositories/auth_repository_impl.dart` - Complete Supabase auth implementation with all interface methods
- `lib/providers/auth_provider.dart` - Riverpod state management with AuthState class and convenience providers

## Decisions Made

- Used Riverpod StateNotifier for authentication state management (consistent with project dependencies)
- Implemented comprehensive AuthRepository interface covering all authentication use cases
- Created AuthState class to encapsulate user, loading, and error states
- Added convenience providers for common UI state access patterns (currentUser, isAuthenticated, isLoading, error)

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None - implementation proceeded smoothly without issues.

## User Setup Required

None - no external service configuration required for this plan.

## Next Phase Readiness

Authentication foundation is now complete with:
- AuthRepository implementation ready for Supabase integration
- Global state management that automatically responds to auth changes
- Error handling and loading states properly implemented
- Session persistence will be handled by Supabase automatically

Ready for next phase: 01-05-router-integration (navigation and auth guards).

---
*Phase: 01-authentication*
*Completed: 2026-01-28*