/** 只有已开启控制且数量有效的库存才约束购买；null 表示没有可展示的确定数量，不代表无限库存。 */
export function productStock(product, model) {
  const quantities = [
    [product?.stock_control, product?.qty],
    [model?.auto_sync_dcim_stock, model?.qty],
  ]
    .filter(
      ([enabled, quantity]) =>
        Number(enabled) === 1 && quantity != null && quantity !== "",
    )
    .map(([, quantity]) => Number(quantity))
    .filter((quantity) => Number.isFinite(quantity) && quantity >= 0);
  return quantities.length ? Math.min(...quantities) : null;
}