/* The same rule as money.py: 4 decimal places, round each line half up to cents. */
(function (root) {
  function units(value) {
    const s = String(value || '0').trim();
    if (!/^\d+(\.\d{0,4})?$/.test(s)) throw new Error('数量和单价须为非负数字，最多四位小数');
    const parts = s.split('.');
    const n = BigInt(parts[0]) * 10000n + BigInt((parts[1] || '').padEnd(4, '0'));
    if (n > 9999999990000n) throw new Error('数量或单价过大');
    return n;
  }
  function lineCents(qty, price) {
    const cents = (units(qty) * units(price) + 500000n) / 1000000n;
    if (cents > 99999999999999n) throw new Error('金额过大');
    return cents;
  }
  function format(cents) {
    return (cents / 100n).toString() + '.' + (cents % 100n).toString().padStart(2, '0');
  }
  const api = {units, lineCents, format};
  if (typeof module !== 'undefined') module.exports = api;
  root.POMoney = api;
})(typeof window === 'undefined' ? globalThis : window);