(function () {
  'use strict';

  var STANDARD_LINKS = [
    { id: 'home', href: 'index.web.html', label: '设计首页', show: 'always' },
    { id: 'admin', href: 'admin/index.html', label: '管理', show: 'admin', elId: 'auth_admin' },
  ];

  function esc(s) {
    if (s == null) return '';
    return String(s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/"/g, '&quot;');
  }

  function authBlock() {
    return '<div class="soon-portal-topbar__guest" id="auth_guest">' +
      '<a href="login.web.html" id="auth_login" class="soon-btn soon-btn--sm">登录</a>' +
      '<a href="register.web.html" id="auth_register" class="soon-btn soon-btn--sm soon-btn--ghost">注册</a>' +
      '</div>' +
      '<div class="soon-portal-topbar__account" id="auth_account" style="display:none">' +
      '<span id="auth_avatar" class="soon-portal-avatar" style="display:none"></span>' +
      '<span id="auth_identity" class="soon-portal-identity" style="display:none"></span>' +
      '</div>' +
      '<nav class="soon-portal-topbar__session" id="auth_session" style="display:none" aria-label="账户">' +
      '<a href="admin/index.html" id="auth_admin" class="soon-portal-topbar__link" style="display:none">管理</a>' +
      '<a href="#" id="auth_logout" class="soon-portal-topbar__link" style="display:none">退出</a>' +
      '</nav>';
  }

  function renderLinks(links, active) {
    return links.map(function (lnk) {
      if (lnk.id === 'admin') return '';
      var cls = 'soon-portal-topbar__link' + (active === lnk.id ? ' is-active' : '');
      return '<a href="' + esc(lnk.href) + '" class="' + cls + '">' + esc(lnk.label) + '</a>';
    }).join('');
  }

  function toolsBlock(lang, linksHtml) {
    return '<div class="soon-portal-topbar__tools">' +
      lang +
      (linksHtml ? '<nav class="soon-portal-topbar__links" aria-label="导航">' + linksHtml +
        '<a href="#" id="auth_clear_cache" class="soon-portal-topbar__link">清除缓存</a></nav>' : '') +
      '</div>';
  }

  /**
   * @param {object} opts
   * @param {string} [opts.variant] standard | auth | design
   * @param {string} [opts.active] home
   * @param {string} [opts.extraClass]
   */
  function html(opts) {
    opts = opts || {};
    var base = opts.assetBase || '../';
    var variant = opts.variant || 'standard';
    var extraCls = opts.extraClass ? ' ' + opts.extraClass : '';

    if (variant === 'auth') {
      return '<header class="soon-portal-topbar soon-auth-topbar' + extraCls + '">' +
        '<div class="soon-portal-topbar__brand"><a href="index.web.html">' +
        '<img src="' + esc(base) + 'assets/images/logo.png" alt=""><span>SoonDesign</span></a></div>' +
        '<div class="soon-portal-topbar__actions">' +
        toolsBlock('', '<a href="index.web.html" class="soon-portal-topbar__link">返回首页</a>') +
        '</div></header>';
    }

    if (variant === 'design') {
      return '<header class="soon-portal-topbar soon-design-portal-bar' + extraCls + '">' +
        '<div class="soon-portal-topbar__brand"><a href="index.web.html">' +
        '<img src="' + esc(base) + 'assets/images/logo.png" alt=""><span>SoonDesign</span></a></div>' +
        '<div class="soon-portal-topbar__actions">' +
        toolsBlock('', '<a href="index.web.html" class="soon-portal-topbar__link">返回首页</a>') +
        authBlock() + '</div></header>';
    }

    var active = opts.active || '';
    var showLang = opts.showLanguage !== false;
    var links = opts.links || STANDARD_LINKS;
    var lang = showLang
      ? '<select id="language_select" class="soon-portal-topbar__lang" aria-label="语言">' +
        '<option value="zh">中文-简体</option><option value="ozh">中文-繁體</option><option value="en">English</option></select>'
      : '';

    return '<header class="soon-portal-topbar' + extraCls + '">' +
      '<div class="soon-portal-topbar__brand"><a href="' + esc(opts.brandHref || 'index.web.html') + '">' +
      '<img src="' + esc(base) + 'assets/images/logo.png" alt=""><span>SoonDesign</span></a></div>' +
      '<div class="soon-portal-topbar__actions">' +
      toolsBlock(lang, renderLinks(links, active)) +
      authBlock() + '</div></header>';
  }

  function mount(selector, opts) {
    var el = typeof selector === 'string' ? document.querySelector(selector) : selector;
    if (!el) return;
    el.innerHTML = html(opts);
    if (opts && opts.initLang !== false) {
      var sel = document.getElementById('language_select');
      if (sel) {
        sel.value = localStorage.getItem('lang') || 'zh';
        sel.onchange = function () { localStorage.setItem('lang', sel.value); };
      }
    }
  }

  window.SoonPortalTopbar = { html: html, mount: mount };
})();