import {AbstractControl} from '@angular/forms';

export function keywordsValidator(control: AbstractControl): { [key: string]: any } | null {
  if (control.value === null) {
    return null;
  }
  let split: string[];
  split = control.value.split(',');
  if (split.length > 3) {
    return {'invalidKeywords': {value: control.value}};
  }
  for (let i = 0; i < split.length; i++) {
    const word = split[i].trim();
    if (word.length < 3) {
      return {'invalidKeywords': {value: control.value}};
    }
  }
  return null;
}