All files / apps/reallocation/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 { formatDateToYMD, isDisabledDate } from '@repo/utils/date';
import {
  normalizeRangeBySlot,
  type TimeSlotValue,
} from '@repo/utils/timeSlotRange';
 
import { type ReallocationShift } from '../ReallocationV2/types';
 
const MAX_LOOKAHEAD_DAYS = 366;
const QUICK_SELECT_TIME_BOUNDARIES = {
  MORNING_START_MINUTES: 8 * 60,
  AFTERNOON_START_MINUTES: 13 * 60 + 30,
} as const;
 
const hasToDate = (value: unknown): value is { toDate: () => Date } => {
  return (
    typeof value === 'object' &&
    value !== null &&
    'toDate' in value &&
    typeof (value as { toDate?: unknown }).toDate === 'function'
  );
};
 
export const normalizeDateValue = (value: unknown): Date | null => {
  if (value instanceof Date && !isNaN(value.getTime())) {
    return value;
  }
 
  if (typeof value === 'string' || typeof value === 'number') {
    const parsed = new Date(value);
    if (!isNaN(parsed.getTime())) {
      return parsed;
    }
  }
 
  if (hasToDate(value)) {
    const parsed = value.toDate();
    Eif (!isNaN(parsed.getTime())) {
      return parsed;
    }
  }
 
  return null;
};
 
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 toMinutes = (date: Date): number =>
  date.getHours() * 60 + date.getMinutes();
 
const shouldSkipTodaySlot = (
  timeSlot: DatePickerTimeSlot,
  nowMinutes: number,
): boolean => {
  switch (timeSlot) {
    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 getShortWeekday = (date: Date) =>
  date.toLocaleDateString('en-US', { weekday: 'short' });
 
export const toDatePickerSlot = (
  shift: ReallocationShift | undefined,
): DatePickerTimeSlot => {
  return shift === 'Afternoon'
    ? DATE_PICKER_TIME_SLOT.AFTERNOON
    : DATE_PICKER_TIME_SLOT.MORNING;
};
 
export const toQuickSelectValue = (
  date: Date,
  shift: ReallocationShift,
): QuickSelectValue => {
  const timeSlot = toDatePickerSlot(shift);
  const mappedRange = normalizeRangeBySlot(
    date,
    date,
    timeSlot as TimeSlotValue,
  );
 
  return {
    startDate: mappedRange.startDate,
    endDate: mappedRange.endDate,
    timeSlot,
  };
};
 
const buildQuickSelectLabel = ({
  candidateDate,
  dayOffset,
  timeSlot,
}: {
  candidateDate: Date;
  dayOffset: number;
  timeSlot: DatePickerTimeSlot;
}) => {
  const isToday = dayOffset === 0;
  if (isToday) {
    return timeSlot === DATE_PICKER_TIME_SLOT.MORNING
      ? 'This morning'
      : 'This afternoon';
  }
 
  const isTomorrow = dayOffset === 1;
  if (isTomorrow) {
    return timeSlot === DATE_PICKER_TIME_SLOT.MORNING
      ? 'Tomorrow morning'
      : 'Tomorrow afternoon';
  }
 
  const weekday = getShortWeekday(candidateDate);
  return `${weekday} - ${
    timeSlot === DATE_PICKER_TIME_SLOT.MORNING ? 'Morning' : 'Afternoon'
  }`;
};
 
const isDisabledReallocationDate = ({
  date,
  holidays,
  makeUpWorkdays,
  startDate,
}: {
  date: Date;
  holidays: string[];
  makeUpWorkdays: string[];
  startDate?: Date;
}) => {
  return isDisabledDate({
    date,
    holidays,
    makeUpWorkdays,
    startDate,
  });
};
 
interface GenerateDynamicQuickSelectOptionsParams {
  holidays: string[];
  makeUpWorkdays: string[];
  now?: Date;
  maxBusinessDays?: number;
}
 
export const generateDynamicQuickSelectOptions = ({
  holidays,
  makeUpWorkdays,
  now = new Date(),
  maxBusinessDays = 4,
}: GenerateDynamicQuickSelectOptionsParams): QuickSelectOption[] => {
  const options: QuickSelectOption[] = [];
  const today = toStartOfDay(now);
  const nowMinutes = toMinutes(now);
  let selectedBusinessDays = 0;
 
  for (
    let dayOffset = 0;
    dayOffset < MAX_LOOKAHEAD_DAYS && selectedBusinessDays < maxBusinessDays;
    dayOffset += 1
  ) {
    const candidateDate = addDays(today, dayOffset);
 
    if (
      isDisabledReallocationDate({
        date: candidateDate,
        holidays,
        makeUpWorkdays,
      })
    ) {
      continue;
    }
 
    const dateKey = formatDateToYMD(candidateDate);
    const timeSlots = [
      DATE_PICKER_TIME_SLOT.MORNING,
      DATE_PICKER_TIME_SLOT.AFTERNOON,
    ] as const;
 
    let hasAddedOptionForCurrentDay = false;
    timeSlots.forEach(timeSlot => {
      if (dayOffset === 0 && shouldSkipTodaySlot(timeSlot, nowMinutes)) {
        return;
      }
 
      const shift =
        timeSlot === DATE_PICKER_TIME_SLOT.MORNING ? 'Morning' : 'Afternoon';
      options.push({
        label: buildQuickSelectLabel({ candidateDate, dayOffset, timeSlot }),
        testID: `quick-select-${dateKey}-${timeSlot}`,
        value: toQuickSelectValue(candidateDate, shift),
      });
      hasAddedOptionForCurrentDay = true;
    });
 
    if (hasAddedOptionForCurrentDay) {
      selectedBusinessDays += 1;
    }
  }
 
  return options;
};
 
export const disabledDateByHolidayCalendar = ({
  value,
  holidays,
  makeUpWorkdays,
  disablePastDates = true,
}: {
  value: unknown;
  holidays: string[];
  makeUpWorkdays: string[];
  disablePastDates?: boolean;
}) => {
  const normalizedDate = normalizeDateValue(value);
  if (!normalizedDate) {
    return false;
  }
 
  const minSelectableDate = disablePastDates
    ? toStartOfDay(new Date())
    : undefined;
  return isDisabledReallocationDate({
    date: normalizedDate,
    holidays,
    makeUpWorkdays,
    startDate: minSelectableDate,
  });
};