All files / packages/utils/src chooseDate.ts

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import { DATE_PICKER_TIME_SLOT } from "@repo/constants";
 
import type { DatePickerTimeSlot, QuickSelectOption, QuickSelectValue } from "@repo/types";
 
import { addDays, formatDateToYMD, isDisabledDate, toMinutes, toStartOfDay } from "./date";
import { applyTimeSlotsToRange } from "./timeSlotRange";
 
export const QUICK_SELECT_TIME_BOUNDARIES = {
  MORNING_START_MINUTES: 8 * 60,
  AFTERNOON_START_MINUTES: 13 * 60 + 30,
  ALL_DAY_END_MINUTES: 17 * 60 + 30,
} as const;
 
export const QUICK_SELECT_SLOT_SEQUENCE = [
  DATE_PICKER_TIME_SLOT.ALL_DAY,
  DATE_PICKER_TIME_SLOT.MORNING,
  DATE_PICKER_TIME_SLOT.AFTERNOON,
] as const;
 
export const shouldSkipTodaySlot = (
  timeSlot: DatePickerTimeSlot,
  nowMinutes: number,
  isAllDayOnly: boolean = false,
): boolean => {
  if (isAllDayOnly) {
    return nowMinutes >= QUICK_SELECT_TIME_BOUNDARIES.ALL_DAY_END_MINUTES;
  }
 
  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;
  }
};
 
export const toQuickSelectValue = (date: Date, timeSlot: DatePickerTimeSlot): QuickSelectValue => {
  const mappedRange = applyTimeSlotsToRange({ startDate: date, endDate: date }, timeSlot, timeSlot);
 
  return {
    startDate: mappedRange.startDate,
    endDate: mappedRange.endDate,
    timeSlot,
  };
};
 
export const getWeekStart = (date: Date): Date => {
  const normalized = toStartOfDay(date);
  const mondayIndex = (normalized.getDay() + 6) % 7;
  normalized.setDate(normalized.getDate() - mondayIndex);
  return normalized;
};
 
export const getWeekPrefix = (day: Date, baseDay: Date): "This" | "Next" => {
  const sameWeek = getWeekStart(day).getTime() === getWeekStart(baseDay).getTime();
  return sameWeek ? "This" : "Next";
};
 
export const getShortWeekday = (date: Date) =>
  date.toLocaleDateString("en-US", { weekday: "short" });
 
export interface QuickSelectLabelParams {
  day: Date;
  isToday: boolean;
  isNextWorkingDay: boolean;
  isCalendarTomorrow: boolean;
  timeSlot: DatePickerTimeSlot;
  baseDay: Date;
}
 
export const getDynamicQuickSelectLabel = (params: QuickSelectLabelParams): 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);
  return `${getWeekPrefix(day, baseDay)} ${shortWeekday}`;
};
 
export const getShortDateQuickSelectLabel = (params: QuickSelectLabelParams): string => {
  const { day, isToday, isCalendarTomorrow, baseDay } = params;
 
  if (isToday) return "Today";
  if (isCalendarTomorrow) return "Tomorrow";
 
  const shortWeekday = getShortWeekday(day);
  return `${getWeekPrefix(day, baseDay)} ${shortWeekday}`;
};
 
export interface GenerateDynamicQuickSelectOptionsParams {
  holidays: string[];
  makeUpWorkdays: string[];
  now?: Date;
  limit?: number;
  maxBusinessDays?: number;
  slotSequence?: readonly DatePickerTimeSlot[];
  fallbackSlotSequence?: readonly DatePickerTimeSlot[];
  labelFormatter?: (params: QuickSelectLabelParams) => string;
}
 
const MAX_LOOKAHEAD_DAYS = 366;
 
export const generateDynamicQuickSelectOptions = ({
  holidays,
  makeUpWorkdays,
  now = new Date(),
  limit = 4,
  maxBusinessDays,
  slotSequence = QUICK_SELECT_SLOT_SEQUENCE,
  fallbackSlotSequence = [DATE_PICKER_TIME_SLOT.ALL_DAY],
  labelFormatter = getDynamicQuickSelectLabel,
}: GenerateDynamicQuickSelectOptionsParams): QuickSelectOption[] => {
  const options: QuickSelectOption[] = [];
  const seenLabels = new Set<string>();
  const today = toStartOfDay(now);
  const nowMinutes = toMinutes(now);
  let businessDaysCount = 0;
  let nextWorkingDayKey: string | null = null;
 
  const isAllDayOnly =
    slotSequence.length === 1 && slotSequence[0] === DATE_PICKER_TIME_SLOT.ALL_DAY;
 
  for (
    let dayOffset = 0;
    dayOffset < MAX_LOOKAHEAD_DAYS &&
    options.length < limit &&
    (maxBusinessDays === undefined || businessDaysCount < maxBusinessDays);
    dayOffset += 1
  ) {
    const candidateDate = addDays(today, dayOffset);
 
    if (
      isDisabledDate({
        date: candidateDate,
        holidays,
        makeUpWorkdays,
      })
    ) {
      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 ? slotSequence : fallbackSlotSequence;
 
    let hasAddedOptionForCurrentDay = false;
 
    for (const timeSlot of timeSlotsForDay) {
      if (isToday && shouldSkipTodaySlot(timeSlot, nowMinutes, isAllDayOnly)) {
        continue;
      }
 
      const label = labelFormatter({
        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),
      });
 
      hasAddedOptionForCurrentDay = true;
 
      if (options.length >= limit) {
        break;
      }
    }
 
    if (hasAddedOptionForCurrentDay) {
      businessDaysCount += 1;
    }
  }
 
  return options;
};