cal.pub0.org/apps/web/lib/slots.ts

84 lines
2.8 KiB
TypeScript

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<WorkingHoursTimeFrame> => {
let initialTime = startTimeMinutes;
const finalizationTime = endTimeMinutes;
const result = [] as Array<WorkingHoursTimeFrame>;
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<WorkingHoursTimeFrame>;
// 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, 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);
}
});
return slots;
};
export default getSlots;