RocketChat/Rocket.Chat

import mem from 'mem';
import moment from 'moment';

export const isDateISOString = mem(
    (input: string): input is string => {
        const timestamp = Date.parse(input);
        return !Number.isNaN(timestamp) && new Date(timestamp).toISOString() === input;
    },
    { maxAge: 10000 },
);

export const mapDateForAPI = (input: string): Date => {
    if (!isDateISOString(input)) {
        throw new Error('invalid ISO 8601 date');
    }

    return new Date(Date.parse(input));
};

export const convertDateToInt = (date: Date): number => parseInt(moment(date).clone().format('YYYYMMDD'), 10);
export const convertIntToDate = (intValue: number): Date => moment(intValue, 'YYYYMMDD').clone().toDate();
const diffBetweenDays = (start: string | number | Date, end: string | number | Date): number =>
    moment(new Date(start)).clone().diff(new Date(end), 'days');
export const diffBetweenDaysInclusive = (start: string | number | Date, end: string | number | Date): number =>
    diffBetweenDays(start, end) + 1;

export const getTotalOfWeekItems = <T extends Record<string, number>>(weekItems: T[], property: keyof T): number =>
    weekItems.reduce((acc, item) => {
        acc += item[property];
        return acc;
    }, 0);

export function transformDatesForAPI(start: string): { start: Date; end: undefined };
export function transformDatesForAPI(start: string, end: string): { start: Date; end: Date };
export function transformDatesForAPI(start: string, end?: string): { start: Date; end: Date | undefined } {
    return {
        start: mapDateForAPI(start),
        end: end ? mapDateForAPI(end) : undefined,
    };
}