import { describe, expect, it } from "vitest";

function toChineseNumber(num: number) {
  let ret = "";
  if (num < 10) {
    ret = num.toLocaleString("zh-u-nu-hanidec");
  } else if (num === 10) {
    ret = "十";
  } else if (num > 10 && num < 20) {
    ret = "十" + (num % 10).toLocaleString("zh-u-nu-hanidec");
  } else if (num >= 20 && num < 100) {
    const s = num
      .toLocaleString("zh-u-nu-hanidec", { useGrouping: false })
      .split("");
    s.splice(1, 0, "十");
    ret = s.join("").replace("〇", "");
  } else {
    ret = num.toLocaleString("zh-u-nu-hanidec");
  }

  return ret;
}

describe("toChineseNumber", () => {
  it("test number to chinese", () => {
    expect(toChineseNumber(12)).toEqual("十二");
    // expect(toChineseNumber(13)).toEqual("一十三");
  });
});