---
phase: 07-task-sorting
plan: 01
subsystem: ui
tags: [flutter, riverpod, shared_preferences, sorting, localization]

# Dependency graph
requires:
  - phase: 05-calendar-strip
    provides: calendarDayProvider and CalendarDayState used by sort integration
  - phase: 06-task-history
    provides: task domain model and CalendarTaskRow context

provides:
  - TaskSortOption enum (alphabetical, interval, effort)
  - SortPreferenceNotifier with SharedPreferences persistence
  - sortPreferenceProvider (keepAlive Riverpod provider)
  - calendarDayProvider with in-memory sort of dayTasks
  - tasksInRoomProvider with in-memory sort via stream.map
  - German localization strings: sortAlphabetical, sortInterval, sortEffort, sortLabel

affects: [07-02-sort-ui, any phase using calendarDayProvider or tasksInRoomProvider]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "SortPreferenceNotifier: sync default return, async _loadPersisted() — same pattern as ThemeNotifier"
    - "In-memory sort helper functions (_sortTasks, _sortTasksRaw) applied after DB stream emit"
    - "overdueTasks intentionally unsorted — only dayTasks sorted"

key-files:
  created:
    - lib/features/tasks/domain/task_sort_option.dart
    - lib/features/tasks/presentation/sort_preference_notifier.dart
    - lib/features/tasks/presentation/sort_preference_notifier.g.dart
    - test/features/tasks/presentation/sort_preference_notifier_test.dart
  modified:
    - lib/features/home/presentation/calendar_providers.dart
    - lib/features/tasks/presentation/task_providers.dart
    - lib/l10n/app_de.arb
    - lib/l10n/app_localizations.dart
    - lib/l10n/app_localizations_de.dart

key-decisions:
  - "Default sort is alphabetical — continuity with existing A-Z SQL sort in CalendarDayList"
  - "overdueTasks are NOT sorted — they stay pinned at the top in existing order"
  - "Sort stored as string (enum.name) in SharedPreferences — not intEnum, so reordering enum is safe"
  - "SortPreferenceNotifier uses keepAlive: true — global preference should never be disposed"

patterns-established:
  - "SortPreferenceNotifier pattern: sync default + async _loadPersisted() — matches ThemeNotifier"
  - "In-memory sort via stream.map in StreamProvider — DB SQL sort provides stable baseline, in-memory overrides"

requirements-completed: [SORT-01, SORT-02, SORT-03]

# Metrics
duration: 4min
completed: 2026-03-16
---

# Phase 07 Plan 01: Task Sort Domain and Provider Summary

**TaskSortOption enum + SharedPreferences-backed SortPreferenceNotifier wired into calendarDayProvider and tasksInRoomProvider with in-memory alphabetical/interval/effort sorting**

## Performance

- **Duration:** 4 min
- **Started:** 2026-03-16T21:29:32Z
- **Completed:** 2026-03-16T21:33:37Z
- **Tasks:** 2
- **Files modified:** 9

## Accomplishments

- TaskSortOption enum (alphabetical, interval, effort) with SharedPreferences persistence via SortPreferenceNotifier
- calendarDayProvider now watches sortPreferenceProvider and sorts dayTasks in-memory; overdueTasks intentionally unsorted
- tasksInRoomProvider now watches sortPreferenceProvider and applies sort via stream.map
- 7 new unit tests for SortPreferenceNotifier covering default, state update, persistence, and restart recovery
- 4 German localization strings added (sortAlphabetical, sortInterval, sortEffort, sortLabel)

## Task Commits

Each task was committed atomically:

1. **TDD RED: Failing sort preference tests** - `a9f2983` (test)
2. **Task 1: TaskSortOption enum, SortPreferenceNotifier, localization** - `13c7d62` (feat)
3. **Task 2: Sort integration into calendarDayProvider and tasksInRoomProvider** - `3697e4e` (feat)

## Files Created/Modified

- `lib/features/tasks/domain/task_sort_option.dart` - TaskSortOption enum with alphabetical/interval/effort values
- `lib/features/tasks/presentation/sort_preference_notifier.dart` - SortPreferenceNotifier with SharedPreferences persistence
- `lib/features/tasks/presentation/sort_preference_notifier.g.dart` - Generated Riverpod provider code
- `lib/features/home/presentation/calendar_providers.dart` - Added sortPreferenceProvider watch + _sortTasks helper
- `lib/features/tasks/presentation/task_providers.dart` - Added sortPreferenceProvider watch + _sortTasksRaw helper + stream.map
- `lib/l10n/app_de.arb` - Added sortAlphabetical, sortInterval, sortEffort, sortLabel strings
- `lib/l10n/app_localizations.dart` - Regenerated with sort string getters
- `lib/l10n/app_localizations_de.dart` - Regenerated with German sort string implementations
- `test/features/tasks/presentation/sort_preference_notifier_test.dart` - 7 unit tests for sort preference

## Decisions Made

- Default sort is alphabetical for continuity with existing SQL A-Z sort in CalendarDayList
- overdueTasks section is explicitly NOT sorted — stays pinned at top in existing order
- Sort preference stored as enum.name string in SharedPreferences (not intEnum) so enum reordering is always safe
- SortPreferenceNotifier uses `keepAlive: true` — global app preference must not be disposed

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- sortPreferenceProvider is live and defaults to alphabetical
- Both task list providers react to sort preference changes immediately
- Ready for 07-02: sort UI (dropdown in AppBar) to write to sortPreferenceProvider

---
*Phase: 07-task-sorting*
*Completed: 2026-03-16*

## Self-Check: PASSED

- FOUND: lib/features/tasks/domain/task_sort_option.dart
- FOUND: lib/features/tasks/presentation/sort_preference_notifier.dart
- FOUND: lib/features/tasks/presentation/sort_preference_notifier.g.dart
- FOUND: test/features/tasks/presentation/sort_preference_notifier_test.dart
- FOUND: .planning/phases/07-task-sorting/07-01-SUMMARY.md
- Commits a9f2983, 13c7d62, 3697e4e all verified in git log