/**
 * Yehwang LibreDesk widget 接入脚本（新栈）
 *
 * 用法：页面里先设置 window.YehwangChatConfig，再引入本脚本。
 *
 *   <script>
 *     window.YehwangChatConfig = {
 *       baseURL: 'http://192.168.31.61:9000',
 *       inboxID: '10fd5207-d235-4c49-beaa-a65eed0ddd0e',
 *       identityURL: 'http://192.168.31.61:4100/identity',
 *       siteJWT: window.__SITE_JWT__ || null   // 站点登录后注入
 *     };
 *   </script>
 *   <script async src="/ai-snippet.js"></script>
 *
 * 有 siteJWT：走 bridge /identity 验签换 LibreDesk widget JWT（生产路径）。
 * 无 siteJWT：匿名访客。
 */
(function () {
  var cfg = window.YehwangChatConfig || {};
  var baseURL = String(cfg.baseURL || 'http://192.168.31.61:9000').replace(/\/+$/, '');
  var inboxID = cfg.inboxID || '10fd5207-d235-4c49-beaa-a65eed0ddd0e';
  var identityURL = cfg.identityURL || 'http://192.168.31.61:4100/identity';

  var state = { loaded: false, userJWT: null };

  function loadWidget() {
    if (state.loaded) return;
    state.loaded = true;
    window.LibredeskSettings = { baseURL: baseURL, inboxID: inboxID };
    if (state.userJWT) window.LibredeskSettings.userJWT = state.userJWT;
    var s = document.createElement('script');
    s.async = true;
    s.src = baseURL + '/widget.js';
    document.head.appendChild(s);
  }

  function postIdentity(body) {
    return fetch(identityURL, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(body),
    }).then(function (res) {
      if (!res.ok) throw new Error('identity HTTP ' + res.status);
      return res.json();
    });
  }

  async function resolveUserJWT() {
    if (cfg.userJWT) return cfg.userJWT;
    if (cfg.siteJWT) {
      var out = await postIdentity({ token: cfg.siteJWT });
      return out.userJWT;
    }
    // 仅开发联调：直接传 email（需要 bridge IDENTITY_DEV_MODE=true）
    if (cfg.demoEmail) {
      var dev = await postIdentity({
        email: cfg.demoEmail,
        externalUserId: cfg.demoExternalId || cfg.demoEmail,
        firstName: cfg.demoFirstName || 'Customer',
        lastName: cfg.demoLastName || '',
      });
      return dev.userJWT;
    }
    return null;
  }

  async function boot() {
    if (cfg.siteJWT || cfg.demoEmail || cfg.userJWT) {
      try {
        state.userJWT = await resolveUserJWT();
      } catch (e) {
        // 身份失败不阻塞 widget，降级为匿名会话
        console.warn('[YehwangChat] identity failed, fallback to anonymous:', e.message);
      }
    }
    loadWidget();
  }

  window.YehwangChat = {
    /** 页面登录状态变化后可调用：重新设置 JWT 并重载（简单做法：刷新页面） */
    setSiteJWT: function (jwt) { cfg.siteJWT = jwt; },
    isLoggedIn: function () { return Boolean(state.userJWT); },
  };

  boot();
})();