/**
 * DateService - Unified date/time service using day.js
 * Handles all date operations, timezone conversions, and formatting
 */
import dayjs from 'dayjs';
import utc from 'dayjs/plugin/utc';
import timezone from 'dayjs/plugin/timezone';
import isoWeek from 'dayjs/plugin/isoWeek';
import customParseFormat from 'dayjs/plugin/customParseFormat';
import isSameOrAfter from 'dayjs/plugin/isSameOrAfter';
import isSameOrBefore from 'dayjs/plugin/isSameOrBefore';
// Enable day.js plugins
dayjs.extend(utc);
dayjs.extend(timezone);
dayjs.extend(isoWeek);
dayjs.extend(customParseFormat);
dayjs.extend(isSameOrAfter);
dayjs.extend(isSameOrBefore);
export class DateService {
    constructor(config) {
        this.timezone = config.timeFormatConfig.timezone;
    }
    // ============================================
    // CORE CONVERSIONS
    // ============================================
    /**
     * Convert local date to UTC ISO string
     * @param localDate - Date in local timezone
     * @returns ISO string in UTC (with 'Z' suffix)
     */
    toUTC(localDate) {
        return dayjs.tz(localDate, this.timezone).utc().toISOString();
    }
    /**
     * Convert UTC ISO string to local date
     * @param utcString - ISO string in UTC
     * @returns Date in local timezone
     */
    fromUTC(utcString) {
        return dayjs.utc(utcString).tz(this.timezone).toDate();
    }
    // ============================================
    // FORMATTING
    // ============================================
    /**
     * Format time as HH:mm or HH:mm:ss
     * @param date - Date to format
     * @param showSeconds - Include seconds in output
     * @returns Formatted time string
     */
    formatTime(date, showSeconds = false) {
        const pattern = showSeconds ? 'HH:mm:ss' : 'HH:mm';
        return dayjs(date).format(pattern);
    }
    /**
     * Format time range as "HH:mm - HH:mm"
     * @param start - Start date
     * @param end - End date
     * @returns Formatted time range
     */
    formatTimeRange(start, end) {
        return `${this.formatTime(start)} - ${this.formatTime(end)}`;
    }
    /**
     * Format date and time in technical format: yyyy-MM-dd HH:mm:ss
     * @param date - Date to format
     * @returns Technical datetime string
     */
    formatTechnicalDateTime(date) {
        return dayjs(date).format('YYYY-MM-DD HH:mm:ss');
    }
    /**
     * Format date as yyyy-MM-dd
     * @param date - Date to format
     * @returns ISO date string
     */
    formatDate(date) {
        return dayjs(date).format('YYYY-MM-DD');
    }
    /**
     * Format date as "Month Year" (e.g., "January 2025")
     * @param date - Date to format
     * @param locale - Locale for month name (default: 'en-US')
     * @returns Formatted month and year
     */
    formatMonthYear(date, locale = 'en-US') {
        return date.toLocaleDateString(locale, { month: 'long', year: 'numeric' });
    }
    /**
     * Format date as ISO string (same as formatDate for compatibility)
     * @param date - Date to format
     * @returns ISO date string
     */
    formatISODate(date) {
        return this.formatDate(date);
    }
    /**
     * Format time in 12-hour format with AM/PM
     * @param date - Date to format
     * @returns Time string in 12-hour format (e.g., "2:30 PM")
     */
    formatTime12(date) {
        return dayjs(date).format('h:mm A');
    }
    /**
     * Get day name for a date
     * @param date - Date to get day name for
     * @param format - 'short' (e.g., 'Mon') or 'long' (e.g., 'Monday')
     * @param locale - Locale for day name (default: 'da-DK')
     * @returns Day name
     */
    getDayName(date, format = 'short', locale = 'da-DK') {
        const formatter = new Intl.DateTimeFormat(locale, {
            weekday: format
        });
        return formatter.format(date);
    }
    /**
     * Format a date range with customizable options
     * @param start - Start date
     * @param end - End date
     * @param options - Formatting options
     * @returns Formatted date range string
     */
    formatDateRange(start, end, options = {}) {
        const { locale = 'en-US', month = 'short', day = 'numeric' } = options;
        const startYear = start.getFullYear();
        const endYear = end.getFullYear();
        const formatter = new Intl.DateTimeFormat(locale, {
            month,
            day,
            year: startYear !== endYear ? 'numeric' : undefined
        });
        // @ts-ignore - formatRange is available in modern browsers
        if (typeof formatter.formatRange === 'function') {
            // @ts-ignore
            return formatter.formatRange(start, end);
        }
        return `${formatter.format(start)} - ${formatter.format(end)}`;
    }
    // ============================================
    // TIME CALCULATIONS
    // ============================================
    /**
     * Convert time string (HH:mm or HH:mm:ss) to total minutes since midnight
     * @param timeString - Time in format HH:mm or HH:mm:ss
     * @returns Total minutes since midnight
     */
    timeToMinutes(timeString) {
        const parts = timeString.split(':').map(Number);
        const hours = parts[0] || 0;
        const minutes = parts[1] || 0;
        return hours * 60 + minutes;
    }
    /**
     * Convert total minutes since midnight to time string HH:mm
     * @param totalMinutes - Minutes since midnight
     * @returns Time string in format HH:mm
     */
    minutesToTime(totalMinutes) {
        const hours = Math.floor(totalMinutes / 60);
        const minutes = totalMinutes % 60;
        return dayjs().hour(hours).minute(minutes).format('HH:mm');
    }
    /**
     * Format time from total minutes (alias for minutesToTime)
     * @param totalMinutes - Minutes since midnight
     * @returns Time string in format HH:mm
     */
    formatTimeFromMinutes(totalMinutes) {
        return this.minutesToTime(totalMinutes);
    }
    /**
     * Get minutes since midnight for a given date
     * @param date - Date to calculate from
     * @returns Minutes since midnight
     */
    getMinutesSinceMidnight(date) {
        const d = dayjs(date);
        return d.hour() * 60 + d.minute();
    }
    /**
     * Calculate duration in minutes between two dates
     * @param start - Start date or ISO string
     * @param end - End date or ISO string
     * @returns Duration in minutes
     */
    getDurationMinutes(start, end) {
        const startDate = dayjs(start);
        const endDate = dayjs(end);
        return endDate.diff(startDate, 'minute');
    }
    // ============================================
    // WEEK OPERATIONS
    // ============================================
    /**
     * Get start and end of week (Monday to Sunday)
     * @param date - Reference date
     * @returns Object with start and end dates
     */
    getWeekBounds(date) {
        const d = dayjs(date);
        return {
            start: d.startOf('week').add(1, 'day').toDate(), // Monday (day.js week starts on Sunday)
            end: d.endOf('week').add(1, 'day').toDate() // Sunday
        };
    }
    /**
     * Add weeks to a date
     * @param date - Base date
     * @param weeks - Number of weeks to add (can be negative)
     * @returns New date
     */
    addWeeks(date, weeks) {
        return dayjs(date).add(weeks, 'week').toDate();
    }
    /**
     * Add months to a date
     * @param date - Base date
     * @param months - Number of months to add (can be negative)
     * @returns New date
     */
    addMonths(date, months) {
        return dayjs(date).add(months, 'month').toDate();
    }
    /**
     * Get ISO week number (1-53)
     * @param date - Date to get week number for
     * @returns ISO week number
     */
    getWeekNumber(date) {
        return dayjs(date).isoWeek();
    }
    /**
     * Get all dates in a full week (7 days starting from given date)
     * @param weekStart - Start date of the week
     * @returns Array of 7 dates
     */
    getFullWeekDates(weekStart) {
        const dates = [];
        for (let i = 0; i < 7; i++) {
            dates.push(this.addDays(weekStart, i));
        }
        return dates;
    }
    /**
     * Get dates for work week using ISO 8601 day numbering (Monday=1, Sunday=7)
     * @param weekStart - Any date in the week
     * @param workDays - Array of ISO day numbers (1=Monday, 7=Sunday)
     * @returns Array of dates for the specified work days
     */
    getWorkWeekDates(weekStart, workDays) {
        const dates = [];
        // Get Monday of the week
        const weekBounds = this.getWeekBounds(weekStart);
        const mondayOfWeek = this.startOfDay(weekBounds.start);
        // Calculate dates for each work day using ISO numbering
        workDays.forEach(isoDay => {
            const date = new Date(mondayOfWeek);
            // ISO day 1=Monday is +0 days, ISO day 7=Sunday is +6 days
            const daysFromMonday = isoDay === 7 ? 6 : isoDay - 1;
            date.setDate(mondayOfWeek.getDate() + daysFromMonday);
            dates.push(date);
        });
        return dates;
    }
    // ============================================
    // GRID HELPERS
    // ============================================
    /**
     * Create a date at a specific time (minutes since midnight)
     * @param baseDate - Base date (date component)
     * @param totalMinutes - Minutes since midnight
     * @returns New date with specified time
     */
    createDateAtTime(baseDate, totalMinutes) {
        const hours = Math.floor(totalMinutes / 60);
        const minutes = totalMinutes % 60;
        return dayjs(baseDate).startOf('day').hour(hours).minute(minutes).toDate();
    }
    /**
     * Snap date to nearest interval
     * @param date - Date to snap
     * @param intervalMinutes - Snap interval in minutes
     * @returns Snapped date
     */
    snapToInterval(date, intervalMinutes) {
        const minutes = this.getMinutesSinceMidnight(date);
        const snappedMinutes = Math.round(minutes / intervalMinutes) * intervalMinutes;
        return this.createDateAtTime(date, snappedMinutes);
    }
    // ============================================
    // UTILITY METHODS
    // ============================================
    /**
     * Check if two dates are the same day
     * @param date1 - First date
     * @param date2 - Second date
     * @returns True if same day
     */
    isSameDay(date1, date2) {
        return dayjs(date1).isSame(date2, 'day');
    }
    /**
     * Get start of day
     * @param date - Date
     * @returns Start of day (00:00:00)
     */
    startOfDay(date) {
        return dayjs(date).startOf('day').toDate();
    }
    /**
     * Get end of day
     * @param date - Date
     * @returns End of day (23:59:59.999)
     */
    endOfDay(date) {
        return dayjs(date).endOf('day').toDate();
    }
    /**
     * Add days to a date
     * @param date - Base date
     * @param days - Number of days to add (can be negative)
     * @returns New date
     */
    addDays(date, days) {
        return dayjs(date).add(days, 'day').toDate();
    }
    /**
     * Add minutes to a date
     * @param date - Base date
     * @param minutes - Number of minutes to add (can be negative)
     * @returns New date
     */
    addMinutes(date, minutes) {
        return dayjs(date).add(minutes, 'minute').toDate();
    }
    /**
     * Parse ISO string to date
     * @param isoString - ISO date string
     * @returns Parsed date
     */
    parseISO(isoString) {
        return dayjs(isoString).toDate();
    }
    /**
     * Check if date is valid
     * @param date - Date to check
     * @returns True if valid
     */
    isValid(date) {
        return dayjs(date).isValid();
    }
    /**
     * Calculate difference in calendar days between two dates
     * @param date1 - First date
     * @param date2 - Second date
     * @returns Number of calendar days between dates (can be negative)
     */
    differenceInCalendarDays(date1, date2) {
        const d1 = dayjs(date1).startOf('day');
        const d2 = dayjs(date2).startOf('day');
        return d1.diff(d2, 'day');
    }
    /**
     * Validate date range (start must be before or equal to end)
     * @param start - Start date
     * @param end - End date
     * @returns True if valid range
     */
    isValidRange(start, end) {
        if (!this.isValid(start) || !this.isValid(end)) {
            return false;
        }
        return start.getTime() <= end.getTime();
    }
    /**
     * Check if date is within reasonable bounds (1900-2100)
     * @param date - Date to check
     * @returns True if within bounds
     */
    isWithinBounds(date) {
        if (!this.isValid(date)) {
            return false;
        }
        const year = date.getFullYear();
        return year >= 1900 && year <= 2100;
    }
    /**
     * Validate date with comprehensive checks
     * @param date - Date to validate
     * @param options - Validation options
     * @returns Validation result with error message
     */
    validateDate(date, options = {}) {
        if (!this.isValid(date)) {
            return { valid: false, error: 'Invalid date' };
        }
        if (!this.isWithinBounds(date)) {
            return { valid: false, error: 'Date out of bounds (1900-2100)' };
        }
        const now = new Date();
        if (options.requireFuture && date <= now) {
            return { valid: false, error: 'Date must be in the future' };
        }
        if (options.requirePast && date >= now) {
            return { valid: false, error: 'Date must be in the past' };
        }
        if (options.minDate && date < options.minDate) {
            return { valid: false, error: `Date must be after ${this.formatDate(options.minDate)}` };
        }
        if (options.maxDate && date > options.maxDate) {
            return { valid: false, error: `Date must be before ${this.formatDate(options.maxDate)}` };
        }
        return { valid: true };
    }
}
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