const DIGITS: Record<string, number> = {
  零: 0,
  〇: 0,
  一: 1,
  二: 2,
  两: 2,
  兩: 2,
  三: 3,
  四: 4,
  五: 5,
  六: 6,
  七: 7,
  八: 8,
  九: 9,
};
const UNITS: Record<string, number> = { 十: 10, 拾: 10, 百: 100, 千: 1000 };

/** 中文数字/阿拉伯数字 → 整数;无法解析返回 undefined */
export function cnToInt(s: string): number | undefined {
  const t = s.trim();
  if (/^\d+$/.test(t)) return Number.parseInt(t, 10);
  if (t === "" || ![...t].every((c) => c in DIGITS || c in UNITS)) return undefined;
  let total = 0;
  let current = 0;
  for (const c of t) {
    const d = DIGITS[c];
    if (d !== undefined) {
      current = d;
      continue;
    }
    const u = UNITS[c]!;
    total += (current || 1) * u;
    current = 0;
  }
  return total + current;
}

export const CN_NUM = "[0-9零〇一二两兩三四五六七八九十拾百千]+";