import pad from './pad';
import { EnumOptionsType, RJSFSchema, StrictRJSFSchema } from './types';

/** Returns a list of options for a date range between `start` and `stop`. If the start date is greater than the end
 * date, then the date range is reversed. If `start` and `stop` are negative numbers (or zero), then they will be
 * treated as relative to the current year.
 *
 * @param start - The starting point of the date range
 * @param stop - The ending point of the date range
 * @returns - The list of EnumOptionsType for the date range between `start` and `stop`
 * @throws - Error when `start` and `stop` aren't both <= 0 or > 0
 */
export default function dateRangeOptions<S extends StrictRJSFSchema = RJSFSchema>(
  start: number,
  stop: number
): EnumOptionsType<S>[] {
  if (start <= 0 && stop <= 0) {
    start = new Date().getFullYear() + start;
    stop = new Date().getFullYear() + stop;
  } else if (start < 0 || stop < 0) {
    throw new Error(`Both start (${start}) and stop (${stop}) must both be <= 0 or > 0, got one of each`);
  }
  if (start > stop) {
    return dateRangeOptions<S>(stop, start).reverse();
  }
  const options: EnumOptionsType<S>[] = [];
  for (let i = start; i <= stop; i++) {
    options.push({ value: i, label: pad(i, 2) });
  }
  return options;
}