345 lines
11 KiB
TypeScript
345 lines
11 KiB
TypeScript
import type { Dayjs } from "@calcom/dayjs";
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import dayjs from "@calcom/dayjs";
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import type { WorkingHours, TimeRange as DateOverride } from "@calcom/types/schedule";
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import { getWorkingHours } from "./availability";
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import { getTimeZone } from "./date-fns";
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import type { DateRange } from "./date-ranges";
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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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dateOverrides?: DateOverride[];
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dateRanges?: DateRange[];
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minimumBookingNotice: number;
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eventLength: number;
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offsetStart?: number;
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organizerTimeZone: string;
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};
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export type TimeFrame = { userIds?: number[]; startTime: number; endTime: number };
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const minimumOfOne = (input: number) => (input < 1 ? 1 : input);
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const minimumOfZero = (input: number) => (input < 0 ? 0 : input);
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function buildSlots({
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startOfInviteeDay,
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computedLocalAvailability,
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frequency,
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eventLength,
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offsetStart = 0,
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startDate,
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organizerTimeZone,
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inviteeTimeZone,
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}: {
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computedLocalAvailability: TimeFrame[];
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startOfInviteeDay: Dayjs;
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startDate: Dayjs;
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frequency: number;
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eventLength: number;
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offsetStart?: number;
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organizerTimeZone: string;
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inviteeTimeZone: string;
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}) {
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// no slots today
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if (startOfInviteeDay.isBefore(startDate, "day")) {
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return [];
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}
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// keep the old safeguards in; may be needed.
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frequency = minimumOfOne(frequency);
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eventLength = minimumOfOne(eventLength);
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offsetStart = minimumOfZero(offsetStart);
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// A day starts at 00:00 unless the startDate is the same as the current day
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const dayStart = startOfInviteeDay.isSame(startDate, "day")
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? Math.ceil((startDate.hour() * 60 + startDate.minute()) / frequency) * frequency
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: 0;
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// Record type so we can use slotStart as key
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const slotsTimeFrameAvailable: Record<
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string,
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{
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userIds: number[];
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startTime: number;
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endTime: number;
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}
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> = {};
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// get boundaries sorted by start time.
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const boundaries = computedLocalAvailability
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.map((item) => [item.startTime < dayStart ? dayStart : item.startTime, item.endTime])
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.sort((a, b) => a[0] - b[0]);
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const ranges: number[][] = [];
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let currentRange: number[] = [];
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for (const [start, end] of boundaries) {
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// bypass invalid value
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if (start >= end) continue;
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// fill first elem
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if (!currentRange.length) {
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currentRange = [start, end];
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continue;
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}
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if (currentRange[1] < start) {
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ranges.push(currentRange);
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currentRange = [start, end];
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} else if (currentRange[1] < end) {
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currentRange[1] = end;
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}
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}
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if (currentRange) {
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ranges.push(currentRange);
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}
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for (const [boundaryStart, boundaryEnd] of ranges) {
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// loop through the day, based on frequency.
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for (
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let slotStart = boundaryStart + offsetStart;
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slotStart < boundaryEnd;
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slotStart += offsetStart + frequency
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) {
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computedLocalAvailability.forEach((item) => {
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// TODO: This logic does not allow for past-midnight bookings.
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if (slotStart < item.startTime || slotStart > item.endTime + 1 - eventLength) {
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return;
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}
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slotsTimeFrameAvailable[slotStart.toString()] = {
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userIds: (slotsTimeFrameAvailable[slotStart]?.userIds || []).concat(item.userIds || []),
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startTime: slotStart,
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endTime: slotStart + eventLength,
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};
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});
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}
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}
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const organizerDSTDiff =
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dayjs().tz(organizerTimeZone).utcOffset() - startOfInviteeDay.tz(organizerTimeZone).utcOffset();
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const inviteeDSTDiff =
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dayjs().tz(inviteeTimeZone).utcOffset() - startOfInviteeDay.tz(inviteeTimeZone).utcOffset();
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const slots: { time: Dayjs; userIds?: number[] }[] = [];
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const getTime = (time: number) => {
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const minutes = time + organizerDSTDiff - inviteeDSTDiff;
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return startOfInviteeDay.tz(inviteeTimeZone).add(minutes, "minutes");
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};
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for (const item of Object.values(slotsTimeFrameAvailable)) {
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/*
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* @calcom/web:dev: 2022-11-06T00:00:00-04:00
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* @calcom/web:dev: 2022-11-06T01:00:00-04:00
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* @calcom/web:dev: 2022-11-06T01:00:00-04:00 <-- note there is no offset change, but we did lose an hour.
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* @calcom/web:dev: 2022-11-06T02:00:00-04:00
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* @calcom/web:dev: 2022-11-06T03:00:00-04:00
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* ...
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*/
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slots.push({
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userIds: item.userIds,
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time: getTime(item.startTime),
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});
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}
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return slots;
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}
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function buildSlotsWithDateRanges({
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dateRanges,
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frequency,
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eventLength,
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timeZone,
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minimumBookingNotice,
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organizerTimeZone,
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offsetStart,
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}: {
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dateRanges: DateRange[];
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frequency: number;
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eventLength: number;
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timeZone: string;
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minimumBookingNotice: number;
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organizerTimeZone: string;
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offsetStart?: number;
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}) {
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// keep the old safeguards in; may be needed.
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frequency = minimumOfOne(frequency);
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eventLength = minimumOfOne(eventLength);
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offsetStart = offsetStart ? minimumOfOne(offsetStart) : 0;
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const slots: { time: Dayjs; userIds?: number[] }[] = [];
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dateRanges.forEach((range) => {
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const startTimeWithMinNotice = dayjs.utc().add(minimumBookingNotice, "minute");
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let slotStartTime = range.start.utc().isAfter(startTimeWithMinNotice)
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? range.start
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: startTimeWithMinNotice;
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let interval = Number(process.env.NEXT_PUBLIC_AVAILABILITY_SCHEDULE_INTERVAL) || 15;
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const intervalsWithDefinedStartTimes = [60, 30, 20, 10];
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for (let i = 0; i < intervalsWithDefinedStartTimes.length; i++) {
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if (frequency % intervalsWithDefinedStartTimes[i] === 0) {
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interval = intervalsWithDefinedStartTimes[i];
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break;
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}
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}
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slotStartTime =
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slotStartTime.minute() % interval !== 0
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? slotStartTime.startOf("hour").add(Math.ceil(slotStartTime.minute() / interval) * interval, "minute")
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: slotStartTime;
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// Adding 1 minute to date ranges that end at midnight to ensure that the last slot is included
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const rangeEnd = range.end
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.add(dayjs().tz(organizerTimeZone).utcOffset(), "minutes")
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.isSame(range.end.endOf("day").add(dayjs().tz(organizerTimeZone).utcOffset(), "minutes"), "minute")
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? range.end.add(1, "minute")
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: range.end;
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slotStartTime = slotStartTime.add(offsetStart ?? 0, "minutes").tz(timeZone);
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while (!slotStartTime.add(eventLength, "minutes").subtract(1, "second").utc().isAfter(rangeEnd)) {
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slots.push({
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time: slotStartTime,
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});
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slotStartTime = slotStartTime.add(frequency + (offsetStart ?? 0), "minutes");
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}
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});
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return slots;
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}
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function fromIndex<T>(cb: (val: T, i: number, a: T[]) => boolean, index: number) {
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return function (e: T, i: number, a: T[]) {
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return i >= index && cb(e, i, a);
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};
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}
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const getSlots = ({
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inviteeDate,
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frequency,
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minimumBookingNotice,
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workingHours = [],
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dateOverrides = [],
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dateRanges,
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eventLength,
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offsetStart = 0,
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organizerTimeZone,
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}: GetSlots) => {
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if (dateRanges) {
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const slots = buildSlotsWithDateRanges({
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dateRanges,
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frequency,
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eventLength,
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timeZone: getTimeZone(inviteeDate),
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minimumBookingNotice,
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organizerTimeZone,
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offsetStart,
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});
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return slots;
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}
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// current date in invitee tz
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const startDate = dayjs().utcOffset(inviteeDate.utcOffset()).add(minimumBookingNotice, "minute");
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// This code is ran client side, startOf() does some conversions based on the
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// local tz of the client. Sometimes this shifts the day incorrectly.
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const startOfDayUTC = dayjs.utc().set("hour", 0).set("minute", 0).set("second", 0);
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const startOfInviteeDay = inviteeDate.startOf("day");
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// checks if the start date is in the past
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/**
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* TODO: change "day" for "hour" to stop displaying 1 day before today
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* This is displaying a day as available as sometimes difference between two dates is < 24 hrs.
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* But when doing timezones an available day for an owner can be 2 days available in other users tz.
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*
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* */
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if (inviteeDate.isBefore(startDate, "day")) {
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return [];
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}
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const timeZone: string = getTimeZone(inviteeDate);
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const workingHoursUTC = workingHours.map((schedule) => ({
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userId: schedule.userId,
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days: schedule.days,
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startTime: /* Why? */ startOfDayUTC.add(schedule.startTime, "minute"),
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endTime: /* Why? */ startOfDayUTC.add(schedule.endTime, "minute"),
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}));
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const localWorkingHours = getWorkingHours(
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{
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// initialize current day with timeZone without conversion, just parse.
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utcOffset: -dayjs.tz(dayjs(), timeZone).utcOffset(),
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},
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workingHoursUTC
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).filter((hours) => hours.days.includes(inviteeDate.day()));
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// Here we split working hour in chunks for every frequency available that can fit in whole working hours
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const computedLocalAvailability: TimeFrame[] = [];
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let tempComputeTimeFrame: TimeFrame | undefined;
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const computeLength = localWorkingHours.length - 1;
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const makeTimeFrame = (item: (typeof localWorkingHours)[0]): TimeFrame => ({
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userIds: item.userId ? [item.userId] : [],
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startTime: item.startTime,
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endTime: item.endTime,
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});
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localWorkingHours.forEach((item, index) => {
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if (!tempComputeTimeFrame) {
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tempComputeTimeFrame = makeTimeFrame(item);
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} else {
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// please check the comment in splitAvailableTime func for the added 1 minute
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if (tempComputeTimeFrame.endTime + 1 === item.startTime) {
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// to deal with time that across the day, e.g. from 11:59 to to 12:01
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tempComputeTimeFrame.endTime = item.endTime;
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} else {
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computedLocalAvailability.push(tempComputeTimeFrame);
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tempComputeTimeFrame = makeTimeFrame(item);
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}
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}
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if (index == computeLength) {
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computedLocalAvailability.push(tempComputeTimeFrame);
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}
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});
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// an override precedes all the local working hour availability logic.
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const activeOverrides = dateOverrides.filter((override) => {
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return dayjs.utc(override.start).isBetween(startOfInviteeDay, startOfInviteeDay.endOf("day"), null, "[)");
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});
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if (activeOverrides.length) {
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const overrides = activeOverrides.flatMap((override) => ({
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userIds: override.userId ? [override.userId] : [],
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startTime: override.start.getUTCHours() * 60 + override.start.getUTCMinutes(),
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endTime: override.end.getUTCHours() * 60 + override.end.getUTCMinutes(),
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}));
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// unset all working hours that relate to this user availability override
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overrides.forEach((override) => {
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let i = -1;
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const indexes: number[] = [];
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while (
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(i = computedLocalAvailability.findIndex(
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fromIndex(
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(a) => !a.userIds?.length || (!!override.userIds[0] && a.userIds?.includes(override.userIds[0])),
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i + 1
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)
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)) != -1
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) {
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indexes.push(i);
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}
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// work backwards as splice modifies the original array.
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indexes.reverse().forEach((idx) => computedLocalAvailability.splice(idx, 1));
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});
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// and push all overrides as new computed availability
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computedLocalAvailability.push(...overrides);
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}
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return buildSlots({
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computedLocalAvailability,
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startOfInviteeDay,
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startDate,
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frequency,
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eventLength,
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offsetStart,
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organizerTimeZone,
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inviteeTimeZone: timeZone,
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});
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};
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export default getSlots;
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