/**
 * 将 getUserCouponList 等接口返回的单条优惠券规范为前端统一结构（与券包页一致）
 * @param {object} raw 接口原始项
 * @param {number} [tabStatus=0] 列表 Tab 状态（券包页传入 currentTab）
 */
export function normalizeUserCouponListItem(raw, tabStatus = 0) {
  if (!raw || typeof raw !== 'object') return null;
  const couponType = Number(raw.couponType) ?? 1;
  const nominalValue = Number(raw.nominalValue ?? raw.amount ?? 0) || 0;
  const discountRate = ((Number(raw.discountRate ?? 0) || 0) / 10) || 0;
  const minAmount = Number(raw.minimumSpendingAmount ?? raw.minAmount ?? 0) || 0;
  let amount = nominalValue;
  let amountUnit = '元';
  let conditionText = minAmount > 0 ? `满${minAmount}可用` : '无门槛';
  if (couponType === 2 && discountRate > 0) {
    amount = discountRate;
    amountUnit = '折';
    conditionText = minAmount > 0 ? `满${minAmount}可用` : '无门槛';
  }
  const expirationTime =
    raw.expirationTime ?? raw.endGetDate ?? raw.expireDate ?? '';
  const longTermValid = Number(raw.longTermValid) === 1 ? 1 : 0;

  // id 用于列表选中态与 :key，必须为「用户持有实例」唯一键；勿把模板 couponId 放首位，否则多张相同活动券会 id 重复、出现多选假象
  const listId =
    raw.userCouponId ??
    raw.user_coupon_id ??
    raw.memberCouponId ??
    raw.receiveRecordId ??
    raw.receiveId ??
    raw.id ??
    raw.couponId ??
    '';

  return {
    id: listId,
    /** 券模板/业务侧 couponId，与 id（用户券实例）区分，支付等场景按需选用 */
    couponId: raw.couponId ?? raw.coupon_id ?? '',
    amount,
    amountUnit,
    minAmount,
    name: raw.name ?? raw.title ?? raw.couponName ?? '',
    expirationTime,
    expireDate: expirationTime,
    longTermValid,
    status: tabStatus,
    couponType,
    nominalValue,
    discountRate,
    conditionText,
    specifiedDay: raw.specifiedDay ?? raw.validDays ?? '',
    supplementaryInstruction: raw.supplementaryInstruction ?? raw.description ?? '',
    qrCodeUrl: raw.qrCodeUrl ?? raw.qrcodeUrl ?? raw.qrUrl ?? '',
    verificationCode:
      raw.verificationCode ?? raw.verifyCode ?? raw.couponCode ?? raw.pickUpCode ?? ''
  };
}

/** 解析 getUserCouponList 分页响应（数组或 { records/list, total }） */
export function parseCouponListPage(res) {
  if (res == null) return { list: [], total: 0 };
  if (Array.isArray(res)) return { list: res, total: 0 };
  const data = res.data !== undefined && res.data !== null && !Array.isArray(res) ? res.data : res;
  if (Array.isArray(data)) return { list: data, total: 0 };
  if (data && typeof data === 'object') {
    const list =
      data.records ??
      data.list ??
      data.rows ??
      data.items ??
      (Array.isArray(data.data) ? data.data : []);
    const total =
      Number(data.total ?? data.totalCount ?? data.totalElements ?? data.count ?? res.total ?? res.totalCount ?? 0) ||
      0;
    return { list: Array.isArray(list) ? list : [], total };
  }
  return { list: [], total: 0 };
}

/** 分页追加时按 id 去重 */
export function mergeCouponListById(existing, incoming) {
  const seen = new Set((existing ?? []).map((c) => String(c?.id ?? '')));
  const out = [...(existing ?? [])];
  for (const item of incoming ?? []) {
    const id = String(item?.id ?? '');
    if (id && !seen.has(id)) {
      seen.add(id);
      out.push(item);
    } else if (!id) {
      out.push(item);
    }
  }
  return out;
}