/* Guest access uses an ephemeral server session, never a saved browser identity. */
window.AccountClient = (function () {
  'use strict';
  var kindKey = 'juzi.auth.kind.v1', user = null, guestReady = false;
  function clearGuestCache() {
    try {
      localStorage.removeItem('juzi.identity.v1');
      localStorage.removeItem('juzi.reports.v1'); // Retired local guest-report cache.
      Object.keys(localStorage).filter(function (name) { return name.indexOf('juzi.profile.v1.browser.') === 0; })
        .forEach(function (name) { localStorage.removeItem(name); });
      if (localStorage.getItem(kindKey) === 'browser') localStorage.removeItem(kindKey);
    } catch (_) {}
  }
  function rememberKind() {
    try { if (user && user.kind === 'wechat') localStorage.setItem(kindKey, 'wechat'); else localStorage.removeItem(kindKey); } catch (_) {}
  }
  function request(url, data) {
    var controller = new AbortController();
    // Bound only authentication waits. Full report snapshots contain photos and
    // must retain their existing download budget on a slow mobile connection.
    var timer = url.indexOf('api/auth/') === 0 ? setTimeout(function () { controller.abort(); }, 12000) : null;
    return fetch(url, { credentials: 'same-origin', method: data ? 'POST' : 'GET',
      signal: controller.signal,
      headers: data ? { 'Content-Type': 'application/json' } : {},
      body: data ? JSON.stringify(data) : undefined }).then(function (r) {
      return r.json().then(function (v) { if (!r.ok || !v.ok) throw new Error(v.message || '请求失败'); return v; });
    }).catch(function (error) {
      if (error.name === 'AbortError') throw new Error('网络响应超时，请检查网络后重试');
      throw error;
    }).finally(function () { clearTimeout(timer); });
  }
  function browser(consent) {
    clearGuestCache();
    return request('api/auth/browser', { consent: consent }).then(function (v) {
      user = v.user; guestReady = true; rememberKind(); return v;
    });
  }
  function guest() {
    clearGuestCache();
    user = { id: 'guest-page-' + Date.now() + '-' + Math.random().toString(36).slice(2), kind: 'browser' };
    guestReady = false; rememberKind(); return user;
  }
  function ensureGuest() {
    // The visitor entry is entirely local. Create temporary server access only
    // after explicit consent in the welcome dialog, not on entry/button tap.
    if (!user || user.kind === 'wechat' || guestReady) return Promise.resolve({ user: user });
    return browser(true);
  }
  function init(options) {
    clearGuestCache();
    return request('api/auth/session').then(function (v) {
      user = v.user;
      guestReady = !!(user && user.kind === 'browser');
      rememberKind();
      // Never restore a guest credential or silently fall back from WeChat.
      return v;
    });
  }
  return { request: request, init: init, browser: browser, guest: guest, ensureGuest: ensureGuest, user: function () { return user; } };
})();