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format,
isAfter,
setHours,
setMinutes,
differenceInCalendarDays,
startOfDay,
parse,
startOfWeek,
subWeeks,
subMonths,
subQuarters,
subYears,
startOfMonth,
startOfQuarter,
startOfYear,
isSameDay,
} from 'date-fns';
import { toZonedTime } from 'date-fns-tz';
import { DateTime, Effect } from 'effect';
// Constants
import { DATE_FORMATS, TIME_RANGE_FORMATTER } from '@/constants/date';
// Types
import { ChartMode } from '@/types/chart';
/**
* Returns the current year as a number.
* Useful for dynamically displaying copyright years.
*/
export const getCurrentYear = (): number => {
const now = Effect.runSync(DateTime.now);
const parts = DateTime.toPartsUtc(now);
return parts.year;
};
/**
* Format a date string (ISO format) into a readable label.
* Example: "2025-07-29T00:00:00.000Z" → "Tuesday, July 29th"
*
* @param dateStr - The ISO date string to format
* @returns A formatted date string like "Friday, August 1st"
*/
export const formatDate = (dateStr: string): string => {
const date = new Date(dateStr);
return format(date, 'EEEE, MMMM do');
};
/**
* Checks if the given date string represents today.
*
* @param dateStr - ISO date string
* @returns True if the date is today, false otherwise
*/
export const isToday = (dateStr: string): boolean => {
const nowUtc = Effect.runSync(DateTime.now);
const now = DateTime.toDate(nowUtc);
const dateUtc = DateTime.unsafeFromDate(new Date(dateStr));
const date = DateTime.toDate(dateUtc);
return (
now.getFullYear() === date.getFullYear() &&
now.getMonth() === date.getMonth() &&
now.getDate() === date.getDate()
);
};
/**
* Checks if a given date is considered expired based on:
* - It is a past date (before today), AND
* - The current time has passed a specific cutoff time (default: 11:30 AM local time)
*
* @param dateStr - An ISO date string, e.g. "2025-08-01T00:00:00.000Z"
* @param hour - The cutoff hour (default: 11)
* @param minute - The cutoff minute (default: 30)
* @returns true if the date is in the past and the current time is after the cutoff; otherwise false.
*/
export const isExpiredDay = (
dateStr: string,
hour = 11,
minute = 30,
timeZone = 'Asia/Ho_Chi_Minh',
): boolean => {
const inputDate = DateTime.toDate(DateTime.unsafeFromDate(new Date(dateStr)));
const utcNow = DateTime.toDate(Effect.runSync(DateTime.now));
const localNow = toZonedTime(utcNow, timeZone);
const today = startOfDay(localNow);
const limitToday = setMinutes(setHours(today, hour), minute);
const diffInDays = differenceInCalendarDays(localNow, inputDate);
const isAfterLimitToday = isAfter(localNow, limitToday);
return diffInDays > 1 || (diffInDays === 1 && isAfterLimitToday);
};
/**
* Converts a date string or Date object to an ISO date string (YYYY-MM-DD).
* @param date A date string or Date object.
* @returns A string in format 'YYYY-MM-DD'.
*/
export const formatDateToISODateString = (
date: string | Date = '',
timeZone = 'Asia/Ho_Chi_Minh',
): string => {
const dt = DateTime.unsafeFromDate(new Date(date));
const zoned = DateTime.unsafeMakeZoned(dt, { timeZone });
const { year, month, day } = DateTime.toParts(zoned);
return `${year}-${String(month).padStart(2, '0')}-${String(day).padStart(2, '0')}`;
};
/**
* Parse a date string with a given format
* @param dateStr - The date string (e.g., "20250822")
* @param formatStr - The format to parse (default: "yyyyMMdd")
* @returns Date object
*/
export const parseDay = (dateStr: string, formatStr = 'yyyyMMdd') => {
return parse(dateStr, formatStr, new Date());
};
/**
* Formats a date string (`yyyyMMdd`) based on the selected chart mode.
*
* - Week & Month → "EEE dd" (e.g., "Fri 05")
* - Quarter & Year → "MMM dd" (e.g., "Sep 05")
*
* @param dateString - Date in `yyyyMMdd` format (e.g., "20250905")
* @param mode - Chart mode that determines the formatting style (default: Week)
* @returns Formatted date string or an empty string if input is invalid
*/
export const formatDateByMode = (
dateString?: string,
mode: ChartMode = ChartMode.Week,
): string => {
if (!dateString || dateString.length < 8) return '';
const parsed = parse(dateString, 'yyyyMMdd', new Date());
if (isNaN(parsed.getTime())) return '';
const pattern = DATE_FORMATS[mode] ?? 'EEE dd';
return format(parsed, pattern);
};
/**
* Returns the current date/time in the given timezone.
*/
const getLocalNow = (timeZone = 'Asia/Ho_Chi_Minh') => {
const utc = DateTime.unsafeNow();
const jsDate = DateTime.toDate(utc);
return toZonedTime(jsDate, timeZone);
};
/**
* Check if a given date is after the cutoff time (e.g., 11:30 AM) in its day.
*/
const isAfterCutoff = (date: Date, hour = 11, minute = 30): boolean => {
const cutoff = setMinutes(setHours(startOfDay(date), hour), minute);
return isAfter(date, cutoff);
};
const TIME_RANGE_GENERATORS: Record<ChartMode, () => string> = {
[ChartMode.Week]: () => {
const lastWeekStart = startOfWeek(subWeeks(new Date(), 1), {
weekStartsOn: 1,
});
return TIME_RANGE_FORMATTER.WEEK(lastWeekStart);
},
[ChartMode.Month]: () => {
const localNow = getLocalNow();
const isPastCutoff = isAfterCutoff(localNow);
// If it's still before 11:30 AM on the first day of the month → go back one more month
const isFirstDayOfMonth = isSameDay(localNow, startOfMonth(localNow));
const monthsBack = isFirstDayOfMonth && !isPastCutoff ? 2 : 1;
const targetMonth = subMonths(localNow, monthsBack);
return TIME_RANGE_FORMATTER.MONTH(targetMonth);
},
[ChartMode.Quarter]: () => {
const localNow = getLocalNow();
const isPastCutoff = isAfterCutoff(localNow);
// If it's still before 11:30 AM on the first day of the quarter → go back one more quarter
const isFirstDayOfQuarter = isSameDay(localNow, startOfQuarter(localNow));
const quartersBack = isFirstDayOfQuarter && !isPastCutoff ? 2 : 1;
const lastQuarter = subQuarters(localNow, quartersBack);
const year = TIME_RANGE_FORMATTER.YEAR(lastQuarter);
const quarter = Math.floor(lastQuarter.getMonth() / 3) + 1;
return `${year}Q${quarter}`;
},
[ChartMode.Year]: () => {
const localNow = getLocalNow();
const isPastCutoff = isAfterCutoff(localNow);
// If it's still before 11:30 AM on the first day of the year → go back one more year
const isFirstDayOfYear = isSameDay(localNow, startOfYear(localNow));
const yearsBack = isFirstDayOfYear && !isPastCutoff ? 2 : 1;
const lastYear = subYears(localNow, yearsBack);
return TIME_RANGE_FORMATTER.YEAR(lastYear);
},
};
/**
* Returns the default time range string for a given chart mode.
*
* @param mode - ChartMode (Week, Month, Quarter, Year)
* @returns string representing the default time range
*/
export const getDefaultTimeRange = (mode: ChartMode): string => {
return TIME_RANGE_GENERATORS[mode]?.() ?? '';
};
type periodRange = {
weeks: { from: Date; to?: Date }[];
months: { year: number; month: number }[];
quarters: { year: number; quarter: number }[];
years: number[];
};
/**
* Format a given set of time ranges into a comma-separated string,
* depending on the chart mode.
*
* @param mode - The chart mode (Week, Month, Quarter, Year).
* @param timeRanges - An object containing arrays of period ranges
* for different modes (weeks, months, quarters, years).
*
* @returns A comma-separated string representing the time ranges
* formatted for the specified chart mode.
* "20250908" / "202501" / "2025Q1" / "2024,2023"
*/
export const formatTimeRanges = (
mode: ChartMode,
timeRanges: periodRange,
): string => {
const FORMATTERS: Record<ChartMode, () => string> = {
[ChartMode.Week]: () =>
timeRanges.weeks.map((w) => TIME_RANGE_FORMATTER.WEEK(w.from)).join(','),
[ChartMode.Month]: () =>
timeRanges.months
.map((m) => `${m.year}${String(m.month + 1).padStart(2, '0')}`)
.join(','),
[ChartMode.Quarter]: () =>
timeRanges.quarters.map((q) => `${q.year}Q${q.quarter}`).join(','),
[ChartMode.Year]: () => timeRanges.years.join(','),
};
return FORMATTERS[mode]();
};
/**
* Convert a year-quarter string (e.g., "2025Q1") into an array of
* three month identifiers in "yyyyMM" format.
*
* @param yearQuarter - A string in the format "YYYYQ#", where # is
* the quarter number (1–4).
*
* @returns An array of strings representing the months in that quarter,
* each in "yyyyMM" format. Returns an empty array if the input is invalid.
*
* @example
* getQuarterDate("2025Q1");
* => ["202501", "202502", "202503"]
*/
export const getQuarterDate = (yearQuarter: string) => {
const match = yearQuarter.match(/^(\d{4})Q([1-4])$/);
if (!match) return [];
const year = Number(match[1]);
const quarter = Number(match[2]);
const startMonth = (quarter - 1) * 3 + 1;
return Array.from({ length: 3 }, (_, i) => {
const month = startMonth + i;
return `${year}${month.toString().padStart(2, '0')}`;
});
};
/**
* Parse a comma-separated string of time ranges into an array of trimmed strings.
*
* @param timeRanges - A string containing time ranges separated by commas (e.g. "2024,2023").
* @returns An array of non-empty, trimmed time range strings.
*
* @example
* parseTimeRanges("2024, 2023"); // ["2024", "2023"]
* parseTimeRanges("2024"); // ["2024"]
* parseTimeRanges(""); // []
*/
export const parseTimeRanges = (timeRanges: string): string[] => {
if (!timeRanges) return [];
return timeRanges
.split(',')
.map((item) => item.trim())
.filter(Boolean);
};
/**
* Check if voting for a meal is currently open.
*
* Voting is only allowed on the current day (`isToday`)
* and only after the specified start time (default: 11:30 AM).
*
* @param date - The meal's date (string or Date).
* @param startHour - Hour of day when voting opens (default: 11).
* @param startMinute - Minute of hour when voting opens (default: 30).
* @param timeZone - IANA time zone string (default: "Asia/Ho_Chi_Minh").
* @returns True if voting is allowed, false otherwise.
*/
export const isVoteOpen = (
date: string | Date,
startHour = 11,
startMinute = 30,
timeZone = 'Asia/Ho_Chi_Minh',
): boolean => {
const mealDate = typeof date === 'string' ? new Date(date) : date;
// Get the "now" in the desired timezone
const now = toZonedTime(new Date(), timeZone);
// Compare only if the mealDate is today (in that timezone)
const mealDateStr = mealDate.toISOString();
if (!isToday(mealDateStr)) return false;
const startTime = toZonedTime(mealDate, timeZone);
startTime.setHours(startHour, startMinute, 0, 0);
return now >= startTime;
};
/**
* Format a week range (Monday–Friday) into a short string.
* Ex: { from: "2025-11-03T00:00:00+07:00", to: "2025-11-07T00:00:00+07:00" }
* → "03.11 - 07.11"
*
* @param range - Object with `from` and `to` date values (Date or string)
* @returns Formatted string in "dd.MM - dd.MM" format
*/
export const getFormattedWeekRange = ({
from,
to,
}: {
from: string | Date;
to: string | Date;
}): string => {
if (!from || !to) return '';
const fromDate = new Date(from);
const toDate = new Date(to);
return `${format(fromDate, 'dd.MM')} - ${format(toDate, 'dd.MM')}`;
};
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