/* 官网共享登录态助手：与 Web 版 App（shared_preferences_web）共享
   localStorage['flutter.*']（值为 JSON 编码）。access token 60 分钟过期，
   官网页面不常驻刷新，所以请求 401 时用 refresh_token 自动续签并重试一次，
   仍失败才交回调用方跳登录。零依赖。 */
(function () {
  function get(key) {
    var raw = localStorage.getItem('flutter.' + key);
    if (raw === null) return null;
    try { return JSON.parse(raw); } catch (e) { return raw; }
  }
  function set(key, val) { localStorage.setItem('flutter.' + key, JSON.stringify(val)); }

  function refresh(apiBase) {
    var rt = get('refresh_token');
    if (!rt) return Promise.resolve(false);
    return fetch(apiBase + '/api/v1/auth/refresh', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ refresh_token: rt }),
    })
      .then(function (r) { return r.ok ? r.json() : null; })
      .then(function (j) {
        var d = j && j.data;
        if (!d || !d.access_token) return false;
        set('access_token', d.access_token);
        if (d.refresh_token) set('refresh_token', d.refresh_token); // refresh token 会轮换
        return true;
      })
      .catch(function () { return false; });
  }

  function authFetch(apiBase, path, opts) {
    opts = opts || {};
    function doFetch() {
      var headers = Object.assign({}, opts.headers, { Authorization: 'Bearer ' + get('access_token') });
      return fetch(apiBase + path, Object.assign({}, opts, { headers: headers }));
    }
    return doFetch().then(function (r) {
      if (r.status !== 401) return r;
      return refresh(apiBase).then(function (ok) { return ok ? doFetch() : r; });
    });
  }

  /* 是否可视为登录：access 过期但 refresh 还在（7 天），authFetch 会自动续 */
  function loggedIn() { return !!(get('access_token') || get('refresh_token')); }

  /* 退出登录：清凭证与身份，保留 shop_no/username 供登录页回填 */
  function clear() {
    ['access_token', 'refresh_token', 'user_id', 'real_name', 'role', 'shop_id'].forEach(function (k) {
      localStorage.removeItem('flutter.' + k);
    });
  }

  window.jiuAuth = { get: get, set: set, refresh: refresh, authFetch: authFetch, loggedIn: loggedIn, clear: clear };
})();