cal.pub0.org/lib/availability.ts

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import { Availability } from "@prisma/client";
import dayjs, { ConfigType } from "dayjs";
import customParseFormat from "dayjs/plugin/customParseFormat";
import timezone from "dayjs/plugin/timezone";
import utc from "dayjs/plugin/utc";
import { Schedule, TimeRange, WorkingHours } from "./types/schedule";
dayjs.extend(utc);
dayjs.extend(timezone);
dayjs.extend(customParseFormat);
// sets the desired time in current date, needs to be current date for proper DST translation
export const defaultDayRange: TimeRange = {
start: new Date(new Date().setUTCHours(9, 0, 0, 0)),
end: new Date(new Date().setUTCHours(17, 0, 0, 0)),
};
export const DEFAULT_SCHEDULE: Schedule = [
[],
[defaultDayRange],
[defaultDayRange],
[defaultDayRange],
[defaultDayRange],
[defaultDayRange],
[],
];
export function getAvailabilityFromSchedule(schedule: Schedule): Availability[] {
return schedule.reduce((availability: Availability[], times: TimeRange[], day: number) => {
const addNewTime = (time: TimeRange) =>
({
days: [day],
startTime: time.start,
endTime: time.end,
} as Availability);
const filteredTimes = times.filter((time) => {
let idx;
if (
(idx = availability.findIndex(
(schedule) => schedule.startTime === time.start && schedule.endTime === time.end
)) !== -1
) {
availability[idx].days.push(day);
return false;
}
return true;
});
filteredTimes.forEach((time) => {
availability.push(addNewTime(time));
});
return availability;
}, [] as Availability[]);
}
export const MINUTES_IN_DAY = 60 * 24;
export const MINUTES_DAY_END = MINUTES_IN_DAY - 1;
export const MINUTES_DAY_START = 0;
/**
* Allows "casting" availability (days, startTime, endTime) given in UTC to a timeZone or utcOffset
*/
export function getWorkingHours(
relativeTimeUnit: {
timeZone?: string;
utcOffset?: number;
},
availability: { days: number[]; startTime: ConfigType; endTime: ConfigType }[]
) {
// clearly bail when availability is not set, set everything available.
if (!availability.length) {
return [
{
days: [0, 1, 2, 3, 4, 5, 6],
// shorthand for: dayjs().startOf("day").tz(timeZone).diff(dayjs.utc().startOf("day"), "minutes")
startTime: MINUTES_DAY_START,
endTime: MINUTES_DAY_END,
},
];
}
const utcOffset = relativeTimeUnit.utcOffset || dayjs().tz(relativeTimeUnit.timeZone).utcOffset();
const workingHours = availability.reduce((workingHours: WorkingHours[], schedule) => {
// Get times localised to the given utcOffset/timeZone
const startTime =
dayjs.utc(schedule.startTime).get("hour") * 60 +
dayjs.utc(schedule.startTime).get("minute") -
utcOffset;
const endTime =
dayjs.utc(schedule.endTime).get("hour") * 60 + dayjs.utc(schedule.endTime).get("minute") - utcOffset;
// add to working hours, keeping startTime and endTimes between bounds (0-1439)
const sameDayStartTime = Math.max(MINUTES_DAY_START, Math.min(MINUTES_DAY_END, startTime));
const sameDayEndTime = Math.max(MINUTES_DAY_START, Math.min(MINUTES_DAY_END, endTime));
if (sameDayStartTime !== sameDayEndTime) {
workingHours.push({
days: schedule.days,
startTime: sameDayStartTime,
endTime: sameDayEndTime,
});
}
// check for overflow to the previous day
if (startTime < MINUTES_DAY_START || endTime < MINUTES_DAY_START) {
workingHours.push({
days: schedule.days.map((day) => day - 1),
startTime: startTime + MINUTES_IN_DAY,
endTime: Math.min(endTime + MINUTES_IN_DAY, MINUTES_DAY_END),
});
}
// else, check for overflow in the next day
else if (startTime > MINUTES_DAY_END || endTime > MINUTES_DAY_END) {
workingHours.push({
days: schedule.days.map((day) => day + 1),
startTime: Math.max(startTime - MINUTES_IN_DAY, MINUTES_DAY_START),
endTime: endTime - MINUTES_IN_DAY,
});
}
return workingHours;
}, []);
workingHours.sort((a, b) => a.startTime - b.startTime);
return workingHours;
}