App({
  globalData: { token: "", user: null, expiresAt: 0 },
  onLaunch() {
    this.globalData.token = wx.getStorageSync("pet_token") || "";
    this.globalData.expiresAt = Number(wx.getStorageSync("pet_token_expires_at")) || 0;
    // Start immediately; pages await the same promise and display failures themselves.
    this.login().catch(() => {});
  },
  async login() {
    if (this.loginPromise) return this.loginPromise;
    if (this.globalData.token && (!this.globalData.expiresAt || this.globalData.expiresAt > Date.now() / 1000 + 60)) return this.globalData.token;
    this.loginPromise = (async () => {
      const { request } = require("./utils/api");
      const refreshToken = wx.getStorageSync("pet_refresh_token");
      if (refreshToken) {
        try {
          const pair = await request("/auth/refresh", "POST", { refresh_token: refreshToken }, false);
          return this.saveSession(pair);
        } catch (error) {
          if (error.status !== 401 && error.status !== 403) throw error;
          wx.removeStorageSync("pet_refresh_token");
        }
      }
      const { code } = await new Promise((resolve, reject) =>
        wx.login({
          timeout: 10000,
          success: resolve,
          fail: () => reject(new Error("暂时无法连接微信，请重新连接")),
        }),
      );
      if (!code) throw new Error("微信登录未取得凭证，请重新连接");
      const data = await request("/auth/login", "POST", { code }, false);
      this.globalData.user = data.user;
      return this.saveSession(data);
    })().finally(() => {
      this.loginPromise = null;
    });
    return this.loginPromise;
  },
  saveSession(data) {
    if (!data || typeof data.token !== "string" || !data.token) throw new Error("登录未完成，请重新连接");
    this.globalData.token = data.token;
    this.globalData.expiresAt = Number(data.expires_at) || 0;
    wx.setStorageSync("pet_token", data.token);
    wx.setStorageSync("pet_token_expires_at", this.globalData.expiresAt);
    if (data.refresh_token) wx.setStorageSync("pet_refresh_token", data.refresh_token);
    return data.token;
  },
});