All files / packages/ui/src/components/DatePicker utils.ts

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import type { DateType } from "react-native-ui-datepicker";
 
import { calculateLeaveDays, formatDaysOff, getStartOfDayTime, isSameDay } from "@repo/utils/date";
import { applyTimeSlotsToRange as applyTimeSlotsToRangeShared } from "@repo/utils/timeSlotRange";
 
import { DATE_PICKER_MODE, DATE_PICKER_TIME_SLOT, DAY_IN_MS } from "./constants";
import type {
  DatePickerMode,
  DatePickerTimeSlot,
  DateRangeValue,
  TempDateRangeValue,
} from "./types";
 
export { formatDaysOff, getStartOfDayTime, isSameDay };
 
const hasToDate = (value: unknown): value is { toDate: () => Date } =>
  typeof value === "object" &&
  value !== null &&
  "toDate" in value &&
  typeof (value as { toDate?: unknown }).toDate === "function";
 
const isValidDate = (value: Date | null | undefined): value is Date =>
  !!value && !Number.isNaN(value.getTime());
 
export const normalizeDate = (value: DateType | null | undefined): Date | null => {
  if (!value) {
    return null;
  }
 
  if (value instanceof Date) {
    return isValidDate(value) ? value : null;
  }
 
  if (typeof value === "string" || typeof value === "number") {
    const parsedDate = new Date(value);
    return isValidDate(parsedDate) ? parsedDate : null;
  }
 
  if (hasToDate(value)) {
    const parsedDate = value.toDate();
    return isValidDate(parsedDate) ? parsedDate : null;
  }
 
  return null;
};
 
export const getInclusiveDaysInRange = (startDate: Date | null, endDate: Date | null): number => {
  if (!startDate && !endDate) {
    return 0;
  }
 
  if (!startDate || !endDate) {
    return 1;
  }
 
  const start = new Date(startDate);
  const end = new Date(endDate);
 
  start.setHours(0, 0, 0, 0);
  end.setHours(0, 0, 0, 0);
 
  const from = Math.min(start.getTime(), end.getTime());
  const to = Math.max(start.getTime(), end.getTime());
 
  return Math.floor((to - from) / DAY_IN_MS) + 1;
};
 
export const calculateDaysOff = (selectedDays: number, timeSlot: DatePickerTimeSlot): number => {
  if (selectedDays <= 0) {
    return 0;
  }
 
  if (timeSlot === DATE_PICKER_TIME_SLOT.ALL_DAY) {
    return selectedDays;
  }
 
  if (selectedDays <= 1) {
    return 0.5;
  }
 
  return selectedDays - 0.5;
};
 
/**
 * Count how many weekdays (Mon–Fri) between startDate and endDate (inclusive)
 * satisfy the given `isDisabled` predicate. Used to subtract user-disabled
 * dates (e.g. public holidays) from the days-off total.
 */
export const countDisabledWeekdaysInRange = (
  startDate: Date,
  endDate: Date,
  isDisabled: (date: DateType) => boolean,
): number => {
  let count = 0;
  const current = new Date(startDate);
  current.setHours(0, 0, 0, 0);
 
  const end = new Date(endDate);
  end.setHours(0, 0, 0, 0);
 
  while (current.getTime() <= end.getTime()) {
    const dayOfWeek = current.getDay();
    const isWeekend = dayOfWeek === 0 || dayOfWeek === 6;
    if (!isWeekend && isDisabled(new Date(current))) {
      count++;
    }
    current.setTime(current.getTime() + DAY_IN_MS);
  }
 
  return count;
};
 
export const calculateRangeDaysOff = (
  range: DateRangeValue,
  startTimeSlot: DatePickerTimeSlot,
  endTimeSlot: DatePickerTimeSlot,
  isDateDisabled?: (date: DateType) => boolean,
): number => {
  const normalizedRange =
    range.startDate && range.endDate
      ? getStartOfDayTime(range.startDate) <= getStartOfDayTime(range.endDate)
        ? range
        : {
            startDate: range.endDate,
            endDate: range.startDate,
          }
      : range;
 
  const rangeWithTime = applyTimeSlotsToRange(normalizedRange, startTimeSlot, endTimeSlot);
 
  if (!rangeWithTime.startDate || !rangeWithTime.endDate) {
    return 0;
  }
 
  const rawDays = calculateLeaveDays(
    rangeWithTime.startDate.toISOString(),
    rangeWithTime.endDate.toISOString(),
  );
 
  if (!isDateDisabled) {
    return rawDays;
  }
 
  // Subtract disabled weekdays (e.g. public holidays) from the raw count.
  // calculateLeaveDays already excludes weekends, so we only count weekday
  // disabled dates here to avoid double-subtracting weekend days.
  const disabledCount = countDisabledWeekdaysInRange(
    normalizedRange.startDate!,
    normalizedRange.endDate!,
    isDateDisabled,
  );
 
  return Math.max(0, rawDays - disabledCount);
};
 
export const toRangeValue = (value: TempDateRangeValue): DateRangeValue => ({
  startDate: normalizeDate(value.startDate),
  endDate: normalizeDate(value.endDate),
});
 
export const getSummaryDate = (
  mode: DatePickerMode,
  tempDate: DateType | null,
  tempRange: TempDateRangeValue,
): Date | null => {
  if (mode === DATE_PICKER_MODE.SINGLE) {
    return normalizeDate(tempDate);
  }
 
  return normalizeDate(tempRange.startDate) || normalizeDate(tempRange.endDate);
};
 
export const getSelectedDays = (
  mode: DatePickerMode,
  tempDate: DateType | null,
  tempRange: TempDateRangeValue,
): number => {
  if (mode === DATE_PICKER_MODE.SINGLE) {
    return normalizeDate(tempDate) ? 1 : 0;
  }
 
  const rangeValue = toRangeValue(tempRange);
  return getInclusiveDaysInRange(rangeValue.startDate, rangeValue.endDate);
};
 
export const applyTimeSlotsToRange = (
  range: DateRangeValue,
  startSlot: DatePickerTimeSlot,
  endSlot: DatePickerTimeSlot,
): DateRangeValue => {
  return applyTimeSlotsToRangeShared(range, startSlot, endSlot);
};
 
/**
 * Number of 7-day rows needed to render a full month grid, matching
 * react-native-ui-datepicker's showOutsideDays padding logic:
 * it always pads to at least 35 cells (5 rows), going to 42 (6 rows)
 * only when the month's leading + current days overflow 35.
 */
export const getCalendarRowCount = (date: Date, firstDayOfWeek = 0): number => {
  const firstOfMonth = new Date(date.getFullYear(), date.getMonth(), 1);
  const daysInMonth = new Date(date.getFullYear(), date.getMonth() + 1, 0).getDate();
  const leadingDays = (firstOfMonth.getDay() - firstDayOfWeek + 7) % 7;
 
  return leadingDays + daysInMonth > 35 ? 6 : 5;
};
 
export const getTimeSlot = (startDate: Date, endDate: Date) => {
  const startHour = startDate.getHours();
  const startMinute = startDate.getMinutes();
  const endHour = endDate.getHours();
  const endMinute = endDate.getMinutes();
 
  const startInMinutes = startHour * 60 + startMinute;
  const endInMinutes = endHour * 60 + endMinute;
 
  const MORNING_START = 8 * 60; // 08:00
  const MORNING_END = 12 * 60; // 12:00
  const AFTERNOON_START = 13 * 60 + 30; // 13:30
  const AFTERNOON_END = 17 * 60 + 30; // 17:30
 
  const isMorning = startInMinutes === MORNING_START && endInMinutes === MORNING_END;
 
  const isAfternoon = startInMinutes === AFTERNOON_START && endInMinutes === AFTERNOON_END;
 
  const isAllDay = startInMinutes === MORNING_START && endInMinutes === AFTERNOON_END;
 
  if (isAllDay) return DATE_PICKER_TIME_SLOT.ALL_DAY;
  if (isMorning) return DATE_PICKER_TIME_SLOT.MORNING;
  if (isAfternoon) return DATE_PICKER_TIME_SLOT.AFTERNOON;
 
  return null;
};