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import { Injectable } from '@angular/core';
import _ from 'lodash';
@Injectable({
providedIn: 'root'
})
export class TimeDiffService {
calculateDuration(startDate: Date, endDate: Date): string {
const startTime = +startDate;
const endTime = +endDate;
const duration = this.getDuration(Math.abs(startTime - endTime));
if (startTime > endTime) {
return '-' + duration;
}
return duration;
}
/**
* Get the duration in the format '[Nd] [Nh] [Nm]', e.g. '2d 1h 15m'.
* @param ms The time in milliseconds.
* @return The duration. An empty string is returned if the duration is
* less than a minute.
*/
private getDuration(ms: number): string {
const date = new Date(ms);
const h = date.getUTCHours();
const m = date.getUTCMinutes();
const d = Math.floor(ms / (24 * 3600 * 1000));
const format = (n: number, s: string) => (n ? n + s : n);
return [format(d, 'd'), format(h, 'h'), format(m, 'm')].filter((x) => x).join(' ');
}
calculateDate(date: Date, duration: string, reverse?: boolean): Date {
const time = +date;
if (_.isNaN(time)) {
return undefined;
}
const diff = this.getDurationMs(duration) * (reverse ? -1 : 1);
return new Date(time + diff);
}
private getDurationMs(duration: string): number {
const d = this.getNumbersFromString(duration, 'd');
const h = this.getNumbersFromString(duration, 'h');
const m = this.getNumbersFromString(duration, 'm');
return ((d * 24 + h) * 60 + m) * 60000;
}
private getNumbersFromString(duration: string, prefix: string): number {
const match = duration.match(new RegExp(`[0-9 ]+${prefix}`, 'i'));
return match ? parseInt(match[0], 10) : 0;
}
}
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