import { isString } from 'typeable';

const ISO8601_REGEX = /^([\+-]?\d{4}(?!\d{2}\b))((-?)((0[1-9]|1[0-2])(\3([12]\d|0[1-9]|3[01]))?|W([0-4]\d|5[0-2])(-?[1-7])?|(00[1-9]|0[1-9]\d|[12]\d{2}|3([0-5]\d|6[1-6])))([T\s]((([01]\d|2[0-3])((:?)[0-5]\d)?|24:?00)([\.,]\d+(?!:))?)?(\17[0-5]\d([\.,]\d+)?)?([zZ]|([\+-])([01]\d|2[0-3]):?([0-5]\d)?)?)?)?$/;

export interface StringDateOptions {
  iso?: boolean;
}

export function stringDate (value: any, recipe: StringDateOptions = {}): boolean {
  if (!isString(value)) return false;

  let date = Date.parse(value);
  if (!date) return false;

  let { iso } = recipe;
  if (iso) {
    return ISO8601_REGEX.test(value);
  }
  return true;
}