import { getStoreBenefitAPI, getStoreVipListAPI } from "@/apis";
import useStore from "@/store";

// 按账号隔离最近选择，刷新登录令牌后仍可恢复同一门店。
const selectionKey = () => {
  const version = uni.getAccountInfoSync().miniProgram.envVersion;
  return `${version}_experience_store_${useStore().user.id || "guest"}`;
};

export const getSelectedExperienceStore = () => {
  const value = uni.getStorageSync(selectionKey());
  return value && /^\d+$/.test(String(value.id)) && Number(value.id) > 0
    ? { id: String(value.id), name: String(value.name || "") }
    : null;
};

export const rememberExperienceStore = (id, name) => {
  uni.setStorageSync(selectionKey(), { id: String(id), name });
};

// 入口汇总所有门店；找到有效会员即可结束，未开通须查询完整列表。
export const hasAnyStoreVip = async () => {
  const pageSize = 20;
  let received = 0;
  for (let page = 1; ; page += 1) {
    const result = await getStoreVipListAPI({ page, pageSize });
    const list = result?.list;
    if (!Array.isArray(list) || !Number.isSafeInteger(result.total) || result.total < 0) {
      throw new Error("门店会员列表响应格式异常");
    }
    if (list.some((item) => item?.isVip === true)) return true;
    if (list.some((item) => typeof item?.isVip !== "boolean")) {
      throw new Error("门店会员状态缺失");
    }
    received += list.length;
    if (received >= result.total) return false;
    // 列表尚未读完却返回空页时，不把不完整结果判为未开通。
    if (!list.length) throw new Error("门店会员列表分页异常");
  }
};

// 只接受非负整数，缺失或异常值不能转换成“已用完”的 0 次。
const normalizeRemaining = (benefit) => {
  const remain = benefit?.remain;
  return Number.isSafeInteger(remain) && remain >= 0 ? remain : "--";
};

export const normalizeStoreMembership = (store) => {
  if (typeof store?.isVip !== "boolean") throw new Error("门店会员状态缺失");
  const active = store.isVip === true;
  return {
    active,
    cardImage: `https://static.shelingxingqiu.com/shootmini/static/coin/store-vip-card-${active ? "active" : "inactive"}.png`,
    expiresAt: active ? String(store.vipExpireAt || "").slice(0, 10).replace(/-/g, "/") || "--" : "",
    // 未开通或已过期统一为 0；有效会员逐项读取后端剩余次数。
    remaining: {
      trial: active ? normalizeRemaining(store.freeTrial) : 0,
      discount: active ? normalizeRemaining(store.discountPurchase) : 0,
      drink: active ? normalizeRemaining(store.drink) : 0,
    },
  };
};

export const loadStoreMembership = async (storeId) => {
  const result = await getStoreBenefitAPI(storeId);
  if (String(result?.storeId) !== String(storeId)) {
    throw new Error("门店权益响应与当前门店不匹配");
  }
  return { name: result.storeName || "", ...normalizeStoreMembership(result) };
};