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Matthew 332dfbad75 feat(ios): enhance background task handlers and documentation

Enhance background task handlers with recovery logic and comprehensive
code documentation:

Background Task Handlers (Section 3.3):
- Enhance handleBackgroundFetch with recovery logic:
  - Verify scheduled notifications after fetch
  - Schedule next background task automatically
  - Improved expiration handling with graceful cleanup
- Enhance handleBackgroundNotify with recovery logic:
  - Verify scheduled notifications state
  - Prepare for next task scheduling
  - Improved expiration handling with graceful cleanup
- Add getNextScheduledNotificationTime() helper method
  - Wraps scheduler.getNextNotificationTime() with timeout
  - Used for automatic next task scheduling

Code Documentation (Section 10.1):
- Add comprehensive file-level documentation to ReactivationManager:
  - Purpose, features, architecture overview
  - Recovery scenarios supported
  - Error handling approach
  - Thread safety notes
  - Cross-references to requirements docs
- Add detailed method-level documentation:
  - performRecovery(): process, scenarios, error handling
  - detectScenario(): detection logic, error handling
  - performColdStartRecovery(): steps, return values
  - detectMissedNotifications(): criteria, error handling
  - verifyFutureNotifications(): verification process
  - rescheduleMissingNotification(): process, throws
  - handleTerminationRecovery(): comprehensive recovery
  - performBootRecovery(): boot recovery process
  - recordRecoveryHistory(): history recording
  - recordRecoveryFailure(): failure recording
  - detectBootScenario(): detection logic
  - updateLastLaunchTime(): storage details
  - verifyBGTaskRegistration(): diagnostic method
- Add @param, @return, @throws tags to all methods
- Document error handling behavior for all methods

Implementation Status (Section 10.2):
- Update ios/Plugin/README.md with current status:
  - Mark all completed features as ✅
  - Add new components (DAO classes, ReactivationManager)
  - Update version to 1.1.0
  - Add recovery scenarios supported
  - Update architecture overview
  - Add last updated date (2025-12-08)

Completes sections 3.3, 10.1, and 10.2 of iOS implementation checklist.

2025-12-09 19:09:07 -08:00

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iOS Implementation

This directory contains the iOS-specific implementation of the DailyNotification plugin.

Last Updated: 2025-12-08
Version: 1.1.0

Current Implementation Status

✅ IMPLEMENTED:

Basic plugin structure (DailyNotificationPlugin.swift)
UserDefaults for local data storage
Power management (DailyNotificationPowerManager.swift)
Battery optimization handling
iOS notification categories and actions
App Launch Recovery (DailyNotificationReactivationManager.swift)
- Cold start recovery
- Termination recovery
- Boot recovery
- Scenario detection
- Missed notification detection
- Future notification verification
Core Data Integration
- NotificationContent, NotificationDelivery, NotificationConfig entities
- DAO classes for all entities (CRUD operations)
- Data type conversions (Date ↔ Int64, etc.)
- PersistenceController with entity verification
Logging & Observability
- Comprehensive recovery logging
- Metrics recording in Core Data History
- Execution time tracking
Error Handling
- iOS-specific error codes
- Graceful error handling (non-fatal)
- Partial results on failures
API Methods
- iOS-specific notification permission methods
- Background task status methods
- Pending notifications query

⚠️ PARTIALLY IMPLEMENTED:

BGTaskScheduler for background data fetching (basic registration)
Background task management (needs enhancement)

❌ NOT IMPLEMENTED (Planned):

Silent push nudge support
T–lead prefetch logic (enhancement)

Implementation Details

The iOS implementation currently uses:

UNUserNotificationCenter for notification management ✅
UserDefaults for local data storage ✅
iOS notification categories and actions ✅
Power management and battery optimization ✅
Core Data for structured data persistence ✅
BGTaskScheduler for background task registration ✅
App Launch Recovery for notification reconciliation ✅

Architecture:

ReactivationManager: Handles app launch recovery scenarios
DAO Layer: Core Data access objects for all entities
Data Conversions: Type conversion utilities (Date, Int, String, JSON)
History Recording: Core Data persistence for recovery metrics
Error Handling: Comprehensive error codes and graceful degradation

Planned additions:

Enhanced background task management
Silent push support

Native Code Location

The native iOS implementation is located in the ios/ directory at the project root.

Key Components

DailyNotificationPlugin.swift: Main plugin class ✅
DailyNotificationPowerManager.swift: Power state management ✅
DailyNotificationConfig.swift: Configuration options ✅
DailyNotificationMaintenanceWorker.swift: Maintenance tasks ✅
DailyNotificationLogger.swift: Logging system ✅
DailyNotificationReactivationManager.swift: App launch recovery ✅
HistoryDAO.swift: Recovery history persistence ✅
NotificationContentDAO.swift: Notification content CRUD ✅
NotificationDeliveryDAO.swift: Delivery tracking CRUD ✅
NotificationConfigDAO.swift: Configuration CRUD ✅
DailyNotificationDataConversions.swift: Type conversion utilities ✅
DailyNotificationErrorCodes.swift: iOS-specific error codes ✅
DailyNotificationModel.swift: Core Data model & PersistenceController ✅

Background Task Components:

DailyNotificationBackgroundTasks.swift: Background task handlers ⚠️ (basic)
DailyNotificationBackgroundTaskManager.swift: Task management ⚠️ (basic)

Implementation Notes

Uses UserDefaults for lightweight data storage ✅
Uses Core Data for structured data persistence ✅
Implements proper battery optimization handling ✅
Supports iOS notification categories and actions ✅
Handles background refresh limitations ✅
App launch recovery with scenario detection ✅
Comprehensive error handling (non-fatal) ✅
Metrics recording and observability ✅
BGTaskScheduler registration ✅

Recovery Scenarios Supported:

✅ Cold Start: App terminated, notifications may need verification
✅ Termination: App terminated, all notifications cleared
✅ Boot: Device rebooted, full recovery needed
✅ Warm Start: No recovery needed (optimization)

Planned Features:

Enhanced background task budget management
Silent push notification support
Advanced prefetch logic

Testing

Run iOS-specific tests with:

npm run test:ios

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