All files / apps/timeOff/src/screens/ChooseDate utils.ts

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import {
  DATE_PICKER_TIME_SLOT,
  type DatePickerTimeSlot,
} from '@repo/ui/components/DatePicker';
import type {
  QuickSelectOption,
  QuickSelectValue,
} from '@repo/ui/components/QuickSelect';
 
import { applyTimeSlotsToRange } from '@repo/utils/timeSlotRange';
 
import { normalizeDateValue } from '@/utils/dateValue';
import { isDisabledHolidayDate } from '@/utils/holidays';
 
import {
  QUICK_SELECT_LIMIT,
  QUICK_SELECT_SLOT_SEQUENCE,
  QUICK_SELECT_TIME_BOUNDARIES,
} from '@/constants/quickSelect';
 
export { normalizeDateValue };
 
export const isDisabledTimeOffDate = ({
  date,
  holidays,
  makeUpWorkdays,
}: {
  date: Date;
  holidays: string[];
  makeUpWorkdays: string[];
}) => {
  return isDisabledHolidayDate({
    date,
    holidays,
    makeUpWorkdays,
  });
};
 
const MAX_LOOKAHEAD_DAYS = 366;
 
const toStartOfDay = (date: Date): Date => {
  const normalized = new Date(date);
  normalized.setHours(0, 0, 0, 0);
  return normalized;
};
 
const addDays = (date: Date, offset: number): Date => {
  const next = new Date(date);
  next.setDate(next.getDate() + offset);
  return next;
};
 
const formatDateToYMD = (date: Date): string => {
  const year = date.getFullYear();
  const month = String(date.getMonth() + 1).padStart(2, '0');
  const day = String(date.getDate()).padStart(2, '0');
  return `${year}-${month}-${day}`;
};
 
const toMinutes = (date: Date): number =>
  date.getHours() * 60 + date.getMinutes();
 
const shouldSkipTodaySlot = (
  timeSlot: DatePickerTimeSlot,
  nowMinutes: number,
): boolean => {
  switch (timeSlot) {
    case DATE_PICKER_TIME_SLOT.ALL_DAY:
    case DATE_PICKER_TIME_SLOT.MORNING:
      return nowMinutes >= QUICK_SELECT_TIME_BOUNDARIES.MORNING_START_MINUTES;
    case DATE_PICKER_TIME_SLOT.AFTERNOON:
      return nowMinutes >= QUICK_SELECT_TIME_BOUNDARIES.AFTERNOON_START_MINUTES;
    default:
      return false;
  }
};
 
const toQuickSelectValue = (
  date: Date,
  timeSlot: DatePickerTimeSlot,
): QuickSelectValue => {
  const mappedRange = applyTimeSlotsToRange(
    { startDate: date, endDate: date },
    timeSlot,
    timeSlot,
  );
 
  return {
    startDate: mappedRange.startDate,
    endDate: mappedRange.endDate,
    timeSlot,
  };
};
 
const getWeekStart = (date: Date): Date => {
  const normalized = toStartOfDay(date);
  // Monday-first week index (Mon=0 ... Sun=6)
  const mondayIndex = (normalized.getDay() + 6) % 7;
  normalized.setDate(normalized.getDate() - mondayIndex);
  return normalized;
};
 
const getWeekPrefix = (day: Date, baseDay: Date): 'This' | 'Next' => {
  const sameWeek =
    getWeekStart(day).getTime() === getWeekStart(baseDay).getTime();
  return sameWeek ? 'This' : 'Next';
};
 
const getShortWeekday = (date: Date) =>
  date.toLocaleDateString('en-US', { weekday: 'short' });
 
const getDynamicQuickSelectLabel = (params: {
  day: Date;
  isToday: boolean;
  isNextWorkingDay: boolean;
  isCalendarTomorrow: boolean;
  timeSlot: DatePickerTimeSlot;
  baseDay: Date;
}): string => {
  const {
    day,
    isToday,
    isNextWorkingDay,
    isCalendarTomorrow,
    timeSlot,
    baseDay,
  } = params;
 
  if (isToday) {
    if (timeSlot === DATE_PICKER_TIME_SLOT.MORNING) return 'This morning';
    if (timeSlot === DATE_PICKER_TIME_SLOT.AFTERNOON) return 'This afternoon';
    return 'Today';
  }
 
  if (isNextWorkingDay) {
    if (isCalendarTomorrow) {
      if (timeSlot === DATE_PICKER_TIME_SLOT.MORNING) return 'Tomorrow morning';
      if (timeSlot === DATE_PICKER_TIME_SLOT.AFTERNOON)
        return 'Tomorrow afternoon';
      return 'Tomorrow';
    }
 
    const shortWeekday = getShortWeekday(day);
    if (timeSlot === DATE_PICKER_TIME_SLOT.MORNING) {
      return `${shortWeekday} morning`;
    }
    if (timeSlot === DATE_PICKER_TIME_SLOT.AFTERNOON) {
      return `${shortWeekday} afternoon`;
    }
    return `${getWeekPrefix(day, baseDay)} ${shortWeekday}`;
  }
 
  const shortWeekday = getShortWeekday(day);
  const dayPrefix = `${getWeekPrefix(day, baseDay)} ${shortWeekday}`;
  return dayPrefix;
};
 
const isWeekend = (date: Date) => {
  const dayOfWeek = date.getDay();
  return dayOfWeek === 0 || dayOfWeek === 6;
};
 
const isDisabledBusinessDay = (
  date: Date,
  holidaySet: Set<string>,
  makeUpSet: Set<string>,
): boolean => {
  const dateKey = formatDateToYMD(date);
  return (
    holidaySet.has(dateKey) || (isWeekend(date) && !makeUpSet.has(dateKey))
  );
};
 
interface GenerateDynamicQuickSelectOptionsParams {
  holidays: string[];
  makeUpWorkdays: string[];
  now?: Date;
  limit?: number;
}
 
export const generateDynamicQuickSelectOptions = ({
  holidays,
  makeUpWorkdays,
  now = new Date(),
  limit = QUICK_SELECT_LIMIT,
}: GenerateDynamicQuickSelectOptionsParams): QuickSelectOption[] => {
  const options: QuickSelectOption[] = [];
  const seenLabels = new Set<string>();
  const today = toStartOfDay(now);
  const nowMinutes = toMinutes(now);
  const holidaySet = new Set(holidays);
  const makeUpSet = new Set(makeUpWorkdays);
  let nextWorkingDayKey: string | null = null;
 
  for (
    let dayOffset = 0;
    dayOffset < MAX_LOOKAHEAD_DAYS && options.length < limit;
    dayOffset += 1
  ) {
    const candidateDate = addDays(today, dayOffset);
 
    if (isDisabledBusinessDay(candidateDate, holidaySet, makeUpSet)) {
      continue;
    }
 
    const candidateDateKey = formatDateToYMD(candidateDate);
    const isToday = dayOffset === 0;
    const isCalendarTomorrow = dayOffset === 1;
    if (!isToday && !nextWorkingDayKey) {
      nextWorkingDayKey = candidateDateKey;
    }
    const isNextWorkingDay = !isToday && nextWorkingDayKey === candidateDateKey;
    const timeSlotsForDay =
      isToday || isNextWorkingDay
        ? QUICK_SELECT_SLOT_SEQUENCE
        : [DATE_PICKER_TIME_SLOT.ALL_DAY];
 
    for (const timeSlot of timeSlotsForDay) {
      if (isToday && shouldSkipTodaySlot(timeSlot, nowMinutes)) {
        continue;
      }
 
      const label = getDynamicQuickSelectLabel({
        day: candidateDate,
        isToday,
        isNextWorkingDay,
        isCalendarTomorrow,
        timeSlot,
        baseDay: today,
      });
      if (seenLabels.has(label)) {
        continue;
      }
      seenLabels.add(label);
 
      options.push({
        label,
        testID: `quick-select-${candidateDateKey}-${timeSlot}`,
        value: toQuickSelectValue(candidateDate, timeSlot),
      });
 
      if (options.length >= limit) {
        break;
      }
    }
  }
 
  return options;
};