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documentation/todo/phase_four.md

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+# Phase 4: Reminders & Calendar Extension
+**Timeline: Weeks 17-22**
+
+This phase focuses on implementing the Reminders & Calendar functionality with potential integration with the Goal Planner extension.
+
+## Week 17-18: Reminders System Implementation
+
+### Time-based Reminders
+- [ ] Design reminder data structure and schema
+- [ ] Implement reminder creation interface
+- [ ] Develop reminder editing and deletion
+- [ ] Create time-based triggering system
+- [ ] Build notification delivery mechanism
+
+### Recurring Reminders
+- [ ] Implement recurring pattern definition
+- [ ] Create daily/weekly/monthly/yearly options
+- [ ] Develop custom recurrence patterns
+- [ ] Build exception handling for recurrence
+- [ ] Design recurrence preview and validation
+
+### Notification System
+- [ ] Implement multi-platform notifications
+- [ ] Create notification customization options
+- [ ] Develop notification acknowledgment tracking
+- [ ] Build notification snooze functionality
+- [ ] Design notification grouping and batching
+
+### Priority and Categorization
+- [ ] Implement priority levels for reminders
+- [ ] Create category management for reminders
+- [ ] Develop filtering by priority and category
+- [ ] Build sorting options for reminder lists
+- [ ] Design visual indicators for priority levels
+
+## Week 19-20: Calendar Interface Development
+
+### Calendar View
+- [ ] Design and implement monthly calendar view
+- [ ] Create weekly and daily view options
+- [ ] Develop agenda/list view alternative
+- [ ] Build view customization options
+- [ ] Implement print and export functionality
+
+### Event Management
+- [ ] Implement event creation interface
+- [ ] Create event editing and deletion
+- [ ] Develop all-day vs. time-specific events
+- [ ] Build multi-day event handling
+- [ ] Design event details and description
+
+### Timeline Visualization
+- [ ] Create visual timeline of upcoming events
+- [ ] Implement zooming and scrolling
+- [ ] Develop filtering and customization
+- [ ] Build event clustering for busy periods
+- [ ] Design color coding by category/source
+
+### Location-based Alerts
+- [ ] Implement location awareness (if appropriate)
+- [ ] Create geofencing for location triggers
+- [ ] Develop location suggestion and search
+- [ ] Build favorite locations management
+- [ ] Design privacy controls for location data
+
+## Week 21-22: Goal Planner Integration
+
+### Unified Interface
+- [ ] Design combined goal and reminder view
+- [ ] Implement visual integration between systems
+- [ ] Create consistent interaction patterns
+- [ ] Build navigation between related items
+- [ ] Develop unified search across both systems
+
+### Synchronized View
+- [ ] Implement goal deadlines as calendar events
+- [ ] Create milestone visualization on calendar
+- [ ] Develop progress tracking within calendar
+- [ ] Build reminder creation from goals
+- [ ] Design visual distinction between types
+
+### AI Scheduling Suggestions
+- [ ] Integrate AI for optimal scheduling
+- [ ] Create time allocation recommendations
+- [ ] Develop conflict detection and resolution
+- [ ] Build workload balancing suggestions
+- [ ] Design goal-aligned time management
+
+### Time Blocking
+- [ ] Implement time blocking interface
+- [ ] Create block customization and templates
+- [ ] Develop recurring time blocks
+- [ ] Build productivity analytics for blocks
+- [ ] Design block visualization on calendar
+
+### Integration Testing
+- [ ] Test goal-calendar synchronization
+- [ ] Verify notification delivery
+- [ ] Validate data consistency between systems
+- [ ] Ensure performance with large datasets
+- [ ] Confirm backup and restore functionality
+
+## Final Deliverables Checklist
+
+### Reminders System
+- [ ] Reminder creation and management works correctly
+- [ ] Recurring reminders function as expected
+- [ ] Notifications are delivered reliably
+- [ ] Priority and categorization are effective
+- [ ] User can easily manage their reminders
+
+### Calendar Functionality
+- [ ] Calendar view displays events clearly
+- [ ] Event management is intuitive
+- [ ] Timeline provides useful upcoming view
+- [ ] Location-based features work as intended
+- [ ] Calendar data can be exported/shared
+
+### Goal Planner Integration
+- [ ] Unified interface is cohesive and intuitive
+- [ ] Synchronized view shows relevant information
+- [ ] AI suggestions are helpful for scheduling
+- [ ] Time blocking enhances productivity
+- [ ] Systems work together without conflicts
+
+### Documentation
+- [ ] Reminders & Calendar features are documented
+- [ ] Integration with Goal Planner is explained
+- [ ] Best practices for time management are included
+- [ ] Export and sharing options are described
+- [ ] Privacy considerations for location are addressed
+
+## Development Standards
+- Ensure reliable notification delivery across platforms
+- Test timezone handling thoroughly
+- Optimize calendar rendering for performance
+- Create comprehensive tests for recurring pattern logic
+- Document all reminder and calendar interfaces
+- Test with realistic usage patterns and data volumes