import dayjs, { Dayjs } from "dayjs"; import isBetween from "dayjs/plugin/isBetween"; import isToday from "dayjs/plugin/isToday"; import utc from "dayjs/plugin/utc"; import { getWorkingHours } from "./availability"; import { WorkingHours } from "./types/schedule"; dayjs.extend(isToday); dayjs.extend(utc); dayjs.extend(isBetween); export type GetSlots = { inviteeDate: Dayjs; frequency: number; workingHours: WorkingHours[]; minimumBookingNotice: number; eventLength: number; }; export type WorkingHoursTimeFrame = { startTime: number; endTime: number }; const splitAvailableTime = ( startTimeMinutes: number, endTimeMinutes: number, frequency: number, eventLength: number ): Array => { let initialTime = startTimeMinutes; const finalizationTime = endTimeMinutes; const result = [] as Array; while (initialTime < finalizationTime) { const periodTime = initialTime + frequency; const slotEndTime = initialTime + eventLength; /* check if the slot end time surpasses availability end time of the user 1 minute is added to round up the hour mark so that end of the slot is considered in the check instead of x9 eg: if finalization time is 11:59, slotEndTime is 12:00, we ideally want the slot to be available */ if (slotEndTime <= finalizationTime + 1) result.push({ startTime: initialTime, endTime: periodTime }); initialTime += frequency; } return result; }; const getSlots = ({ inviteeDate, frequency, minimumBookingNotice, workingHours, eventLength }: GetSlots) => { // current date in invitee tz const startDate = dayjs().add(minimumBookingNotice, "minute"); const startOfDay = dayjs.utc().startOf("day"); const startOfInviteeDay = inviteeDate.startOf("day"); // checks if the start date is in the past if (inviteeDate.isBefore(startDate, "day")) { return []; } const localWorkingHours = getWorkingHours( { utcOffset: -inviteeDate.utcOffset() }, workingHours.map((schedule) => ({ days: schedule.days, startTime: startOfDay.add(schedule.startTime, "minute"), endTime: startOfDay.add(schedule.endTime, "minute"), })) ).filter((hours) => hours.days.includes(inviteeDate.day())); const slots: Dayjs[] = []; const slotsTimeFrameAvailable = [] as Array; // Here we split working hour in chunks for every frequency available that can fit in whole working hours const computedLocalWorkingHours: WorkingHoursTimeFrame[] = []; let tempComputeTimeFrame: WorkingHoursTimeFrame | undefined; const computeLength = localWorkingHours.length - 1; const makeTimeFrame = (item: typeof localWorkingHours[0]): WorkingHoursTimeFrame => ({ startTime: item.startTime, endTime: item.endTime, }); localWorkingHours.forEach((item, index) => { if (!tempComputeTimeFrame) { tempComputeTimeFrame = makeTimeFrame(item); } else { // please check the comment in splitAvailableTime func for the added 1 minute if (tempComputeTimeFrame.endTime + 1 === item.startTime) { // to deal with time that across the day, e.g. from 11:59 to to 12:01 tempComputeTimeFrame.endTime = item.endTime; } else { computedLocalWorkingHours.push(tempComputeTimeFrame); tempComputeTimeFrame = makeTimeFrame(item); } } if (index == computeLength) { computedLocalWorkingHours.push(tempComputeTimeFrame); } }); computedLocalWorkingHours.forEach((item) => { slotsTimeFrameAvailable.push(...splitAvailableTime(item.startTime, item.endTime, frequency, eventLength)); }); slotsTimeFrameAvailable.forEach((item) => { const slot = startOfInviteeDay.add(item.startTime, "minute"); // Validating slot its not on the past if (!slot.isBefore(startDate)) { slots.push(slot); } }); const uniq = (a: Dayjs[]) => { const seen: Record = {}; return a.filter((item) => { return seen.hasOwnProperty(item.format()) ? false : (seen[item.format()] = true); }); }; return uniq(slots); }; export default getSlots;