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TaxStayTracker

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Complete Feature Overview

App Architecture

  • SwiftUI-based iOS App with Core Data for persistence
  • MVVM Architecture with ObservableObject services
  • Modular structure with separate services for different functionalities

Location Tracking (LocationManager)

  • Automatic GPS tracking with background updates
  • Intelligent battery optimization based on battery level and Low Power Mode
  • Hybrid tracking strategy: Significant Location Changes + regular updates
  • Offline functionality with geocoding cache and OfflineCountryService
  • Region monitoring for known locations
  • Adaptive update intervals (1h, 4h, 8h, 12h, 24h)
  • Automatic vs. manual mode with different tracking intensities
  • Network monitoring with automatic retry mechanisms
  • Exponential backoff for failed geocoding attempts
  • Background task management for reliable tracking

Data Management (DataService)

  • Core Data-based persistence with Stay, Country and LocationEntry entities
  • Intelligent cache management with adaptive expiration times
  • Batch processing for large datasets
  • Conflict detection and intelligent resolution for overlapping stays
  • Same-day travel detection for travel days
  • Automatic country creation and day counting
  • NSFetchedResultsController for efficient data queries
  • Background context for heavy operations
  • Data validation and error handling

Dashboard & UI (Views)

  • UnifiedDashboardView: Main overview with status cards
  • CurrentStatusCard: Current tracking status and country
  • TopCountriesCard: Top 3 visited countries with progress bars
  • TravelHistoryCard: Travel history with filter options
  • TrackingProgressCard: Year progress and statistics
  • Responsive design for different screen sizes
  • Dark mode compatibility

Manual Entry (ManualStayEntryView)

  • Retrospective stay entry with date picker
  • Country selection with search functionality
  • Travel details: Transport method, reference, notes
  • Intelligent conflict detection and resolution
  • Same-day travel support
  • Transport method selection (Airplane, Car, Train, Bus, Ship, Other)
  • Reference tracking (Flight numbers, license plates, etc.)
  • Travel notes for additional context

History & Statistics (HistoryView)

  • Year-based filtering with available years
  • Country grouping with stay details
  • Active vs. completed stays
  • Leap year support (366 days)
  • Tracking percentage per year
  • Country stay groups with total days calculation
  • Empty state handling for years without data

Settings (SettingsView & TrackingSettingsView)

  • Location permissions with detailed explanations
  • Tracking modes: Automatic vs. manual
  • Battery optimization and power mode adaptation
  • Data export and deletion
  • App information and support
  • Permission status monitoring
  • Update interval configuration
  • Feature overview with descriptions

Export Functionality (ExportManager)

  • PDF Generator: Professional reports following Apple Design Guidelines
  • CSV Export: For spreadsheet applications
  • Flexible time periods: Year, month, custom date ranges
  • Export preview with statistics
  • Share Sheet integration
  • Multiple export formats with format descriptions
  • Date range validation and filtering

Country Detection

  • Online geocoding with CLGeocoder
  • Offline fallback with OfflineCountryService
  • Persistent cache for geocoding results
  • Country flags with FlagUtils
  • Bounding box filter and point-in-polygon tests
  • Natural Earth boundary data for offline detection
  • Cache optimization with grid-based keys

Conflict Management

  • Intelligent conflict detection for overlapping stays
  • Automatic resolution with various strategies:
    • Trim (shorten existing stays)
    • Split (divide into multiple stays)
    • Replace (replace existing stays)
  • Same-day travel support
  • User-friendly conflict resolution
  • Travel type detection (same-day vs. overnight)
  • Conflict resolution preview with action descriptions

User Experience

  • Multilingual support with Localizable.xcstrings
  • Responsive design for various screen sizes
  • Intuitive navigation with SwiftUI NavigationStack
  • Accessibility support
  • Dark mode compatibility
  • Smooth animations and transitions
  • Loading states and progress indicators

Privacy & Security

  • Local data storage without cloud sync
  • No third-party tracking
  • Transparent permission requests
  • Data export for user control
  • Privacy-focused design with local-only processing
  • Secure data handling with Core Data encryption

Performance Optimizations

  • NSFetchedResultsController for efficient data queries
  • Background context for heavy operations
  • Adaptive cache management
  • Batch processing for large datasets
  • Memory management with automatic cleanup
  • Lazy loading for large datasets
  • Efficient Core Data queries with proper indexing

Testing & Quality Assurance

  • Unit tests for core functionalities
  • UI tests for user interactions
  • Error handling with user-friendly error messages
  • Fallback mechanisms for offline scenarios
  • Data validation and integrity checks
  • Performance monitoring and optimization

Tax-Related Features

  • 183-day rule monitoring with visual indicators
  • Annual statistics for tax purposes
  • Detailed stay protocols
  • Export-friendly formats (PDF/CSV)
  • Tax residency day counting with inclusive date calculation
  • Country-specific stay tracking
  • Professional report generation for tax advisors

Data Synchronization & Backup

  • Local-only storage for privacy
  • Export capabilities for data portability
  • Data integrity checks and validation
  • Automatic data cleanup for old entries
  • Backup and restore functionality

Analytics & Reporting

  • Annual tracking statistics
  • Country visit frequency
  • Stay duration analytics
  • Travel pattern analysis
  • Export statistics and summaries
  • Visual progress indicators
  • Historical data trends

Internationalization

  • Multi-language support with comprehensive localization
  • Country-specific formatting
  • Currency and date formatting
  • Regional settings adaptation
  • Accessibility compliance

Advanced Features

  • Smart conflict resolution with user choice
  • Offline country detection using embedded boundary data
  • Intelligent caching with adaptive expiration
  • Background processing for large datasets
  • Memory optimization for long-running sessions
  • Error recovery mechanisms
  • Data migration support

Platform Integration

  • iOS system integration with background app refresh
  • Share Sheet integration for exports
  • Settings app integration for permissions
  • Notification support for tracking status

TaxStayTracker is a comprehensive solution for automatic and manual tracking of stays in different countries, specifically developed for tax purposes, with a focus on user-friendliness, privacy, and reliability. The app provides professional-grade tracking capabilities while maintaining simplicity and ease of use for end users.

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