@uplink-protocol/calendar-controller

# Date Controller Capabilities ## Overview The Date Controller provides comprehensive calendar and date picker functionality with advanced features for building sophisticated date selection interfaces. ## Core Features ### 📅 Date Selection - **Single Date Selection**: Select individual dates with full validation - **Date Range Selection**: Select start and end dates for booking systems - **Programmatic Selection**: Set dates via API calls or user interaction - **Selection Validation**: Automatic validation against constraints ### 🧭 Calendar Navigation - **Month Navigation**: Previous/next month with year boundary handling - **Year Navigation**: Jump between years with smooth transitions - **Decade Navigation**: Browse years in configurable decade ranges - **Direct Navigation**: Jump to specific months, years, or dates - **Today Navigation**: Quick return to current date ### 🗓️ Calendar Views - **Month View**: Traditional calendar grid with weeks and days - **Year View**: 12-month overview for year-level navigation - **Decade View**: Multi-year selection with configurable ranges - **Week Numbers**: ISO week number support for business applications - **Multi-Month Display**: Support for displaying multiple months ### 🚫 Date Constraints - **Date Range Limits**: Set minimum and maximum selectable dates - **Disabled Dates**: Block specific dates (holidays, blackout dates) - **Disabled Weekdays**: Block days of the week (e.g., weekends) - **Custom Validation**: Implement complex business rules - **Dynamic Constraints**: Update constraints based on selections ### 🌐 Internationalization - **Locale Support**: Full i18n with 100+ locales - **Month Names**: Localized month names (full and abbreviated) - **Weekday Names**: Localized weekday names with configurable formats - **Date Formatting**: Locale-appropriate date formatting - **First Day of Week**: Configurable week start (Sunday/Monday) - **Text Direction**: RTL language support ### ♿ Accessibility - **Keyboard Navigation**: Full keyboard support (arrows, home, end, page up/down) - **Screen Reader Support**: ARIA labels and descriptions - **Focus Management**: Proper focus handling and visual indicators - **Accessible Labels**: Descriptive labels for dates and states - **Date Announcements**: Clear announcements for state changes ### 🎭 Event System - **Date Selection Events**: Fired when dates are selected - **Navigation Events**: Month/year change notifications - **View Change Events**: Calendar view transitions - **Range Events**: Date range selection notifications - **Focus Events**: Focus change notifications for accessibility ### 📊 Data Generation - **Calendar Days**: Generate complete month view with metadata - **Calendar Months**: Generate year view with month information - **Calendar Years**: Generate decade view with year data - **Week Information**: Calculate week numbers and week boundaries - **Date Metadata**: Rich information about each date (today, weekend, etc.) ### 🛠️ Utilities - **Date Formatting**: Flexible date formatting with Intl support - **Date Validation**: Check if dates are valid, today, weekends, etc. - **Week Calculations**: ISO week numbers and week boundaries - **Date Arithmetic**: Add/subtract days, months, years - **State Descriptions**: Generate accessibility descriptions ## Advanced Features ### 🏢 Business Logic Integration - **Holiday Support**: Integration with holiday calendars - **Business Rules**: Complex validation and constraint systems - **Booking Systems**: Support for reservation and availability systems - **Recurring Events**: Handle recurring date patterns - **Time Zone Handling**: Work with dates across time zones ### 📈 Performance - **Lazy Generation**: Generate calendar data only when needed - **Efficient Updates**: Minimal re-rendering with reactive bindings - **Large Data Sets**: Handle years of calendar data efficiently - **Memory Management**: Automatic cleanup and optimization - **Caching**: Smart caching of generated calendar data ### 🔗 Integration - **Framework Agnostic**: Works with React, Vue, Angular, vanilla JS - **State Management**: Reactive bindings for automatic UI updates - **External Calendars**: Integration with Google Calendar, Outlook, etc. - **Form Libraries**: Easy integration with form validation systems - **Testing**: Comprehensive test utilities and mocking support ## API Structure ### Bindings (Reactive State) ```javascript { selectedDate: Date | null, // Currently selected date selectedDateRange: DateRange, // Selected date range (start/end) focusedDate: Date | null, // Currently focused date currentDate: Date, // Current navigation date currentMonth: number, // Current month (0-11) currentYear: number, // Current year monthName: string, // Localized month name calendarDays: CalendarDate[], // Month view calendar days calendarMonths: CalendarMonth[], // Year view months calendarYears: CalendarYear[], // Decade view years weekdays: string[], // Localized weekday names isRangeSelection: boolean, // Range selection mode currentYearRangeBase: number // Current decade base year } ``` ### Methods (Actions) ```javascript { // Date Selection selectDate(date), selectDate(year, month, day), clearSelection(), // Navigation goToNextMonth(), goToPreviousMonth(), goToNextYear(), goToPreviousYear(), goToToday(), goToMonth(month, year), goToYear(year), goToDate(date), // Year Range Navigation goToNextYearRange(), goToPreviousYearRange(), setYearRangeSize(size), getCurrentYearRange(), setCurrentYearRange(date), // Constraints setMinDate(date), setMaxDate(date), setDisabledDates(dates[]), addDisabledDate(date), removeDisabledDate(date), setDisabledDaysOfWeek(days[]), addDisabledDayOfWeek(day), removeDisabledDayOfWeek(day), // Validation isDateDisabled(date), isToday(date), // Generation generateCalendarDays(), generateCalendarMonths(), generateCalendarYears(), generateMonthView(), // Accessibility setFocusedDate(date), clearFocusedDate(), focusDate(date), moveFocusRight(), moveFocusLeft(), moveFocusUp(), moveFocusDown(), moveFocusToStartOfMonth(), moveFocusToEndOfMonth(), moveFocusToPreviousMonth(), moveFocusToNextMonth(), selectFocusedDate(), getAccessibleDateLabel(date), getDateStateDescription(date), // Formatting formatDate(date, options), getFormattedDate(), setDateFormatOptions(options), getDateFormatOptions(), // Localization setLocale(locale), getLocale(), getMonthNames(), getWeekdayNames(short), // Utilities getWeekNumber(date), setRangeSelectionMode(enabled) } ``` ### Events (Notifications) ```javascript { dateSelected: Observable<Date>, dateRangeSelected: Observable<DateRange>, monthChanged: Observable<number>, yearChanged: Observable<number>, viewChanged: Observable<{month, year}>, yearRangeChanged: Observable<YearRange> } ``` ## Use Cases ### 📱 Date Picker Components - Single date selection for forms - Date range selection for bookings - Inline calendar widgets - Dropdown date pickers ### 🏨 Booking Systems - Hotel reservation calendars - Meeting room scheduling - Event planning interfaces - Availability management ### 📊 Business Applications - Report date ranges - Financial period selection - Project timeline planning - Audit date tracking ### 🌍 International Applications - Multi-language date pickers - Cultural calendar variations - Regional date formats - Time zone considerations ### ♿ Accessible Interfaces - Screen reader compatible calendars - Keyboard-only navigation - High contrast date pickers - Voice control integration ## Browser Support - Modern browsers (Chrome 80+, Firefox 78+, Safari 13+, Edge 80+) - Mobile browsers (iOS Safari 13+, Chrome Mobile 80+) - Internationalization requires Intl API support ## Bundle Size - Core functionality: ~15KB gzipped - Full features: ~25KB gzipped - Tree-shakable for minimal builds ## Framework Compatibility - ✅ React (16.8+) - ✅ Vue (3.0+) - ✅ Angular (12+) - ✅ Svelte (3.0+) - ✅ Vanilla JavaScript - ✅ TypeScript (4.0+)