window.Router = (function() {
  'use strict';

  const routes = {
    'dashboard':      { title: '仪表盘',      render: 'DashboardPage.render', role: null },
    'companies':      { title: '客户管理',      render: 'CompaniesPage.render', role: null },
    'contacts':       { title: '联系人管理',    render: 'ContactsPage.render',  role: null },
    'org-nodes':      { title: '组织架构',      render: 'OrgNodesPage.render',  role: null },
    'decision-nodes': { title: '决策关系',      render: 'DecisionPage.render',  role: null },
    'follow-records': { title: '沟通留痕',      render: 'FollowsPage.render',   role: null },
    'users':          { title: '用户管理',      render: 'UsersPage.render',     role: 'admin' },
  };

  function getCurrentHash() {
    const h = location.hash.replace(/^#\/?/, '');
    return h || 'dashboard';
  }

  function resolve(path) {
    const seg = path.split('/')[0];
    return routes[seg] || null;
  }

  async function navigate(path) {
    const r = resolve(path);
    if (!r) { navigate('dashboard'); return; }

    if (r.role === 'admin' && !Auth.isAdmin) {
      UI.toast('无权访问此页面', 'error');
      navigate('dashboard');
      return;
    }

    document.getElementById('page-title').textContent = r.title;

    document.querySelectorAll('.nav-item').forEach(el => {
      el.classList.toggle('active', el.dataset.route === path || (el.dataset.route === 'dashboard' && path === 'dashboard'));
    });

    const area = document.getElementById('content-area');
    area.innerHTML = '<div style="text-align:center;padding:40px;color:var(--gray-500)">加载中...</div>';

    try {
      const fn = eval(r.render);
      if (typeof fn === 'function') {
        const html = await fn();
        area.innerHTML = html;
      }
    } catch (e) {
      Logger.error(`页面渲染失败: ${path} - ${e.message}`);
      area.innerHTML = '<div style="text-align:center;padding:40px;color:var(--danger)">页面加载失败</div>';
    }
  }

  function start() {
    window.addEventListener('hashchange', () => navigate(getCurrentHash()));
    if (Auth.isLoggedIn) {
      navigate(getCurrentHash());
    }
  }

  function buildNav() {
    const nav = document.getElementById('nav-menu');
    const items = [
      ['dashboard', '仪表盘'],
      ['companies', '客户管理'],
      ['contacts', '联系人'],
      ['org-nodes', '组织架构'],
      ['decision-nodes', '决策关系'],
      ['follow-records', '沟通留痕'],
    ];
    if (Auth.isAdmin) items.push(['users', '用户管理']);

    nav.innerHTML = items.map(([k, label]) =>
      `<a class="nav-item" data-route="${k}" href="#/${k}">${label}</a>`
    ).join('');
  }

  return { start, navigate, getCurrentHash, buildNav, routes };
})();