71 lines
2.3 KiB
TypeScript
71 lines
2.3 KiB
TypeScript
import dayjs, { Dayjs } from "dayjs";
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import isBetween from "dayjs/plugin/isBetween";
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import isToday from "dayjs/plugin/isToday";
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import utc from "dayjs/plugin/utc";
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import { getWorkingHours } from "./availability";
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import { WorkingHours } from "./types/schedule";
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dayjs.extend(isToday);
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dayjs.extend(utc);
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dayjs.extend(isBetween);
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export type GetSlots = {
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inviteeDate: Dayjs;
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frequency: number;
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workingHours: WorkingHours[];
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minimumBookingNotice: number;
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};
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const getMinuteOffset = (date: Dayjs, frequency: number) => {
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// Diffs the current time with the given date and iff same day; (handled by 1440) - return difference; otherwise 0
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const minuteOffset = Math.min(date.diff(dayjs().utc(), "minute"), 1440) % 1440;
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// round down to nearest step
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return Math.ceil(minuteOffset / frequency) * frequency;
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};
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// eslint-disable-next-line @typescript-eslint/no-unused-vars
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const getSlots = ({ inviteeDate, frequency, minimumBookingNotice, workingHours }: GetSlots) => {
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// current date in invitee tz
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const startDate = dayjs().add(minimumBookingNotice, "minute");
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// checks if the start date is in the past
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if (inviteeDate.isBefore(startDate, "day")) {
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return [];
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}
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const localWorkingHours = getWorkingHours(
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{ utcOffset: -inviteeDate.utcOffset() },
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workingHours.map((schedule) => ({
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days: schedule.days,
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startTime: dayjs.utc().startOf("day").add(schedule.startTime, "minute"),
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endTime: dayjs.utc().startOf("day").add(schedule.endTime, "minute"),
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}))
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).filter((hours) => hours.days.includes(inviteeDate.day()));
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const slots: Dayjs[] = [];
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for (let minutes = getMinuteOffset(inviteeDate, frequency); minutes < 1440; minutes += frequency) {
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const slot = dayjs(inviteeDate).startOf("day").add(minutes, "minute");
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// check if slot happened already
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if (slot.isBefore(startDate)) {
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continue;
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}
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// add slots to available slots if it is found to be between the start and end time of the checked working hours.
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if (
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localWorkingHours.some((hours) =>
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slot.isBetween(
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inviteeDate.startOf("day").add(hours.startTime, "minute"),
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inviteeDate.startOf("day").add(hours.endTime, "minute"),
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null,
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"[)"
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)
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)
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) {
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slots.push(slot);
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}
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}
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return slots;
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};
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export default getSlots;
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