import { Inject, Pipe, PipeTransform } from '@angular/core';
import moment from 'moment-es6';
/* import { SymbolService } from '../../symbol/symbol.service'; */

/** The GroupPipe filters an array of Item instances by a given property value.
 * It is meant to be used to get only the items with the exact same value. */
@Pipe({
  name: 'datetime',
})
export class DatetimePipe implements PipeTransform {
  constructor(@Inject('moment.format.date') private dateFormat /* private symbol: SymbolService */) {}
  transform(
    value: Date | string,
    pattern: string | string[] = this.dateFormat /* this.symbol.resolve('moment.format.date') */,
  ): string {
    if (!value) {
      return '';
    }
    const typed = moment(value, pattern, true);
    if (!typed.isValid()) {
      return '';
    }
    if (Array.isArray(pattern)) {
      pattern = pattern[0];
    }
    return moment(value).format(pattern);
  }
}