import { Pipe, PipeTransform } from '@angular/core';
@Pipe({
  name: 'timeAgo'
})
export class MTimeAgoPipe implements PipeTransform {
  transform(time: any, reference: any): string {
    time = new Date(time);
    const ref: Date = new Date(reference);

    if (!time.getTime()) {
      return 'Invalid Date';
    }

    const startTime: number = isNaN(ref.getTime()) ? Date.now() : ref.getTime();
    let diff: number = Math.floor((startTime - time.getTime()) / 1000);

    if (diff < 2) {
      return '1 second ago';
    }
    if (diff < 60) {
      return Math.floor(diff) + ' seconds ago';
    }
    // Minutes
    diff = diff / 60;
    if (diff < 2) {
      return '1 minute ago';
    }
    if (diff < 60) {
      return Math.floor(diff) + ' minutes ago';
    }
    // Hours
    diff = diff / 60;
    if (diff < 2) {
      return '1 hour ago';
    }
    if (diff < 24) {
      return Math.floor(diff) + ' hours ago';
    }
    // Days
    diff = diff / 24;
    if (diff < 2) {
      return '1 day ago';
    }
    if (diff < 30) {
      return Math.floor(diff) + ' days ago';
    }
    // Months
    diff = diff / 30;
    if (diff < 2) {
      return '1 month ago';
    }
    if (diff < 12) {
      return Math.floor(diff) + ' months ago';
    }
    // Years
    diff = diff / 12;
    if (diff < 2) {
      return '1 year ago';
    } else {
      return Math.floor(diff) + ' years ago';
    }
  }
}