/** 商品履约能力（与 HQ / 交易硬闸一致） */

export type FulfillmentFlags = {
  allowOnlinePurchase?: boolean | null;
  allowOnSitePickup?: boolean | null;
  allowCrossCityDelivery?: boolean | null;
};

/** 未返回时默认允许线上（存量商品） */
export function canBuyOnline(p: FulfillmentFlags): boolean {
  return p.allowOnlinePurchase !== false;
}

/** 仅显式开启才展示现场取货 */
export function canPickupOnSite(p: FulfillmentFlags): boolean {
  return p.allowOnSitePickup === true;
}

export function canCrossCity(p: FulfillmentFlags): boolean {
  return p.allowCrossCityDelivery !== false;
}

export function normalizeFulfillmentFlags<T extends FulfillmentFlags>(p: T): T {
  return {
    ...p,
    allowOnlinePurchase: canBuyOnline(p),
    allowOnSitePickup: canPickupOnSite(p),
    allowCrossCityDelivery: canCrossCity(p),
  };
}

/** 与交易侧一致：收货市 ≠ 开城市且 ≠ 郑州 → 跨城 */
export function isCrossCityAddress(
  addressCity: string | null | undefined,
  openCityName: string | null | undefined,
): boolean {
  const addr = (addressCity || '').trim();
  const open = (openCityName || '').trim();
  if (!addr) return false;
  if (addr === '郑州市') return false;
  if (open && addr === open) return false;
  // 尚无开城信息时，非郑州地址先按可能跨城处理（由预览接口最终裁定）
  if (!open) return addr !== '郑州市';
  return true;
}