export function formatMoney(cents: number, currency = "CNY", locale = "zh-CN"): string {
  return new Intl.NumberFormat(locale, {
    style: "currency",
    currency,
    minimumFractionDigits: 2,
    maximumFractionDigits: 2,
  }).format(cents / 100);
}

export const money = formatMoney;

export function centsToAmount(cents: number): string {
  return (cents / 100).toFixed(2);
}

export function amountToCents(value: string): number {
  const match = /^(\d+)(?:\.(\d{1,2}))?$/.exec(value.trim());
  if (!match) throw new Error("INVALID_AMOUNT");
  const cents = Number(match[1]) * 100 + Number((match[2] ?? "").padEnd(2, "0"));
  if (!Number.isSafeInteger(cents) || cents <= 0) throw new Error("INVALID_AMOUNT");
  return cents;
}

export const yuanToCents = amountToCents;