cal/packages/lib/isOutOfBounds.tsx

import { EventType, PeriodType } from "@prisma/client";

import dayjs from "@calcom/dayjs";

export class BookingDateInPastError extends Error {
  constructor(message = "Attempting to book a meeting in the past.") {
    super(message);
  }
}

function guardAgainstBookingInThePast(date: Date) {
  if (date >= new Date()) {
    // Date is in the future.
    return;
  }
  throw new BookingDateInPastError();
}

function isOutOfBounds(
  time: dayjs.ConfigType,
  {
    periodType,
    periodDays,
    periodCountCalendarDays,
    periodStartDate,
    periodEndDate,
  }: Pick<
    EventType,
    "periodType" | "periodDays" | "periodCountCalendarDays" | "periodStartDate" | "periodEndDate"
  >
) {
  const date = dayjs(time);
  guardAgainstBookingInThePast(date.toDate());

  periodDays = periodDays || 0;

  switch (periodType) {
    case PeriodType.ROLLING: {
      const periodRollingEndDay = periodCountCalendarDays
        ? dayjs().utcOffset(date.utcOffset()).add(periodDays, "days").endOf("day")
        : dayjs().utcOffset(date.utcOffset()).businessDaysAdd(periodDays).endOf("day");
      return date.endOf("day").isAfter(periodRollingEndDay);
    }

    case PeriodType.RANGE: {
      const periodRangeStartDay = dayjs(periodStartDate).utcOffset(date.utcOffset()).endOf("day");
      const periodRangeEndDay = dayjs(periodEndDate).utcOffset(date.utcOffset()).endOf("day");
      return date.endOf("day").isBefore(periodRangeStartDay) || date.endOf("day").isAfter(periodRangeEndDay);
    }

    case PeriodType.UNLIMITED:
    default:
      return false;
  }
}

export default isOutOfBounds;