const Router = (() => {
  const routes = {};
  const beforeEachHooks = [];
  const afterEachHooks = [];

  function register(path, render) {
    routes[path] = render;
  }

  function onBeforeEach(fn) { beforeEachHooks.push(fn); }
  function onAfterEach(fn) { afterEachHooks.push(fn); }

  async function navigate(path) {
    for (const h of beforeEachHooks) await h(path);
    const view = document.getElementById('view');
    view.classList.add('fade-enter');
    const render = routes[path] || routes['/404'];
    const html = await render();
    view.innerHTML = html;
    requestAnimationFrame(() => {
      view.classList.add('fade-enter-active');
      view.classList.remove('fade-enter');
      setTimeout(() => view.classList.remove('fade-enter-active'), 220);
    });
    for (const h of afterEachHooks) await h(path);
  }

  async function init() {
    window.addEventListener('hashchange', () => {
      const path = location.hash.replace('#', '') || '/dashboard';
      navigate(path);
      highlightActive(path);
      updateBreadcrumb(path);
    });
    
    // 检查用户登录状态，决定默认路径
    let defaultPath = '/dashboard';
    try {
      const user = await API.me().catch(() => null);
      if (!user || !user.username) {
        defaultPath = '/login';
      }
    } catch(e) {
      defaultPath = '/login';
    }
    
    const path = location.hash.replace('#', '') || defaultPath;
    navigate(path);
    highlightActive(path);
    updateBreadcrumb(path);
  }

  function highlightActive(path) {
    document.querySelectorAll('.nav-item, .nav-child').forEach(el => el.classList.remove('active'));
    const target = document.querySelector(`[data-route="${routeKey(path)}"]`);
    if (target) target.classList.add('active');
  }

  function routeKey(path) {
    return path
      .replace('/', '')
      .replaceAll('/', '-')
      || 'dashboard';
  }

  function updateBreadcrumb(path) {
    const bc = document.getElementById('breadcrumb');
    const parts = path.split('/').filter(Boolean);
    let acc = '#';
    bc.innerHTML = parts.map((p, i) => {
      acc += '/' + p;
      const last = i === parts.length - 1;
      return `<a href="${acc}" style="color:${last ? 'var(--text)' : 'var(--text-2)'};text-decoration:none">${label(p)}</a>`;
    }).join(' / ');
  }

  function label(key) {
    const map = {
      dashboard: '仪表盘',
      login: '登录',
      upload: '上传', 
      mac: 'MAC与批次', 
      stats: '良/不良统计', 
      defects: '不良明细', 
      repairs: '返修记录',
      shipments: '发货记录',
      query: '查询',
      devices: '设备状态', 
      environment: '环境参数', 
      personnel: '人员信息', 
      qa: '质检报告', 
      production: '时间记录',
      export: '导出', 
      settings: '设置'
    };
    return map[key] || key;
  }

  return { register, init, onBeforeEach, onAfterEach };
})();