import { NgbDateParserFormatter, NgbDateStruct } from '@ng-bootstrap/ng-bootstrap';
import { DatePipe } from '@angular/common';
import { Injectable } from '@angular/core';

@Injectable()
export class CustomNgbDateParserFormatter extends NgbDateParserFormatter {
  datePipe = new DatePipe('en-US');
  constructor() {
    super();
  }
  format(date: NgbDateStruct): string {
    if (date === null) {
      return '';
    }
    try {
      return this.datePipe.transform(new Date(date.year, date.month - 1, date.day), 'd/M/yyyy');
    } catch (e) {
      return '';
    }
  }
  parse(value: string): NgbDateStruct {
    let returnVal: NgbDateStruct;
    if (!value) {
      returnVal = null;
    } else {
      try {
        let dateParts = this.datePipe.transform(value, 'M-d-y').split('-');
        returnVal = { year: parseInt(dateParts[2]), month: parseInt(dateParts[0]), day: parseInt(dateParts[1]) };
      } catch (e) {
        returnVal = null;
      }
    }
    return returnVal;
  }
}