import { Pipe, PipeTransform } from '@angular/core';
import moment from 'moment';

@Pipe({
  standalone: true,
  name: 'timeFormat',
})
export class TimeFormatPipe implements PipeTransform {
  transform(expireDate: Date | string): string {
    if (!expireDate) {
      return 'Invalid date';
    }

    const expireMoment = moment(expireDate).utc();

    if (!expireMoment.isValid()) {
      return 'Invalid date';
    }

    const now = moment().utc();

    const daysUntilExpiration = expireMoment.diff(now, 'days');
    const hoursUntilExpiration = expireMoment.diff(now, 'hours');

    if (daysUntilExpiration > 1) {
      return `${daysUntilExpiration} day${daysUntilExpiration === 1 ? '' : 's'} ${daysUntilExpiration < 0 ? 'ago' : 'to go'}`;
    } else if (daysUntilExpiration < 1) {
      return `${Math.abs(hoursUntilExpiration)} hour${Math.abs(hoursUntilExpiration) === 1 ? '' : 's'} ${hoursUntilExpiration < 0 ? 'ago' : 'to go'}`;
    } else {
      return '1 day to go';
    }
  }
}