export class JsonTransformerUtil {

  /**
   * Since JSOn does not support dates natively, we'll recursively transform dates formatted like ISO
   * @param obj object to transform dates in
   * @example
   * transformDates({a: 'whatever'});
   * //=>{a: 'whatever'}
   * @example
   * transformDates({someDate: '2020-11-06T10:12:05Z'});
   * //=> {someDate: Fri Nov 06 2020 11:12:05 GMT+0100 (Central European Standard Time)}
   */
  static transformDates(obj: any): any {
    if (obj == null) {
      return obj;
    }
    switch (typeof obj) {
      case 'object':
        Object.keys(obj).forEach(key => {
          obj[key] = JsonTransformerUtil.transformDates(obj[key]);
        });
        return obj;
      case 'string':
        if (/^(-?(?:[1-9][0-9]*)?[0-9]{4})-(1[0-2]|0[1-9])-(3[01]|0[1-9]|[12][0-9])T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\.[0-9]+)?(Z)?$/.test(obj)) {
          // If object is a string formatted like an ISO-8601 string, we'll turn it into a date
          return new Date(Date.parse(obj));
        }
        return obj;
      default:
        return obj;
    }
  }
}