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; }; export type WorkingHoursTimeFrame = { startTime: number; endTime: number }; const splitAvailableTime = ( startTimeMinutes: number, endTimeMinutes: number, frequency: number ): Array => { let initialTime = startTimeMinutes; const finalizationTime = endTimeMinutes; const result = [] as Array; while (initialTime < finalizationTime) { const periodTime = initialTime + frequency; result.push({ startTime: initialTime, endTime: periodTime }); initialTime += frequency; } return result; }; const getSlots = ({ inviteeDate, frequency, minimumBookingNotice, workingHours }: 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 hour localWorkingHours.forEach((item, index) => { slotsTimeFrameAvailable.push(...splitAvailableTime(item.startTime, item.endTime, frequency)); }); slotsTimeFrameAvailable.forEach((item) => { const slot = startOfInviteeDay.add(item.startTime, "minute"); // Validating slot its not on the past if (!slot.isBefore(startDate)) { slots.push(slot); } }); return slots; }; export default getSlots;