/** 金额展示（不依赖 Intl / toLocaleString，兼容微信小程序） */
export function toMoneyNumber(amount: unknown): number {
  if (typeof amount === 'number') return Number.isFinite(amount) ? amount : 0;
  if (typeof amount === 'string' && amount.trim()) {
    const n = Number(amount);
    return Number.isFinite(n) ? n : 0;
  }
  if (amount && typeof amount === 'object') {
    const o = amount as { toNumber?: () => number; toString?: () => string };
    if (typeof o.toNumber === 'function') {
      const n = Number(o.toNumber());
      if (Number.isFinite(n)) return n;
    }
    if (typeof o.toString === 'function' && o.toString !== Object.prototype.toString) {
      const n = Number(o.toString());
      if (Number.isFinite(n)) return n;
    }
  }
  return 0;
}

export function formatMoney(amount: number | string): string {
  const n = toMoneyNumber(amount);
  const fixed = n.toFixed(2);
  const [intPart, dec] = fixed.split('.');
  const withComma = intPart.replace(/\B(?=(\d{3})+(?!\d))/g, ',');
  return `${withComma}.${dec}`;
}