import { Tuple } from '../../primitive/Tuple';
import { Length } from '../Length';
/**
 *
 * Type that takes an array of strings and a separator and returns a string with the array elements joined by the separator
 *
 * 문자열 튜플과 구분자를 받아 튜플 요소를 구분자로 결합한 문자열을 반환하는 타입
 *
 * @params T - Array of strings to join / 결합할 문자열 튜플
 *
 * @params U - Separator to join the array elements / 튜플 요소를 결합할 구분자
 *
 * @returns Joined string / 결합된 문자열
 *
 * @example
 * type cases = [
 *   Expect<Equal<Join<['a', 'p', 'p', 'l', 'e'], '-'>, 'a-p-p-l-e'>>,
 *   Expect<Equal<Join<['Hello', 'World'], ' '>, 'Hello World'>>,
 *   Expect<Equal<Join<['2', '2', '2'], 1>, '21212'>>,
 *   Expect<Equal<Join<['o'], 'u'>, 'o'>>,
 *   Expect<Equal<Join<[], 'u'>, ''>>,
 *   Expect<Equal<Join<['1', '1', '1']>, '1,1,1'>>,
 * ];
 *
 * @link https://www.utilscript.site/docs/usage-array/join
 *
 */
export type Join<T extends Tuple<string | number>, U extends string | number = ',', R extends string = ''> = T extends readonly [
    infer Current extends string | number,
    ...infer Rest extends Tuple<string | number>
] ? Length<Rest> extends 0 ? Join<Rest, U, `${R}${Current}`> : Join<Rest, U, `${R}${Current}${U}`> : R;