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/** * MIT License * Copyright (c) 2020 Burhanuddin Ahmed * Update 14 June 2020 - add daylight saving time */
import { timezone as List } from "./new-api.ts";import { privateReturn, TimezoneType, IDSTCheck } from "./type.ts";
const MINUTES_TO_MILISECOND = 60000;
export class Timezone {    public manipulated: string;    public userTime: string | undefined;    private timezone: string | undefined;        constructor ({timezone, time}: TimezoneType) {        this.userTime = time;        this.manipulated = '';        this.timezone = timezone;    }
    public exec () {        let getUTCMilisecond = new Date().getTime();        if (this.userTime) {            getUTCMilisecond = new Date(this.userTime).getTime();        }
        if (this.timezone) {            let addedtime = this.parseText(this.timezone);            if (!addedtime.status) {                throw addedtime.text;            }            // return manipulated timezone based on calculation additional / differentiation time            this.manipulated =  new Date(getUTCMilisecond + Number(addedtime.text)).toISOString();           }        return this;    }
    private parseText (textTimezone: string): privateReturn {        let obj = List.find(el => el.id.toLowerCase() == textTimezone.toLocaleLowerCase());        if (!obj) {            return {                status: false,                text: 'timezone you entered is not compatible'            };        }        let offsetNumber = this.dstChecker({ ...obj });        let getTimezoneHours = offsetNumber.split(':');        let firstNum = Number(getTimezoneHours[0]);        let secondNum = Number(getTimezoneHours[0]) >= 0 ?                         Number(getTimezoneHours[1]) :                         (Number(getTimezoneHours[1]) * -1);        let getMinutes = ((firstNum * 60) + secondNum) * MINUTES_TO_MILISECOND;        return {            status: true,            text: `${getMinutes}`        }    }
    private dstChecker ({        id,        country_code,        offset,        dst,        text    }: IDSTCheck) {        let us = {            start: '2020-03-08 02:00',            end: '2020-11-01 02:00'        };        let eu = {            start: '2020-03-29 01:00',            end: '2020-10-25 01:00'        };        let dateNow = new Date().getTime();        if (dst === offset) {            return offset;        }        let start, end;        if (id.split('/')[0] == 'Europe') {            start = eu.start;            end = eu.end;        } else {            start = us.start;            end = us.end;        }        if (            dateNow > new Date(start).getTime() &&            dateNow < new Date(end).getTime()        ) {            return dst;        }        return offset;    }}