/* MeowPanel — 前端逻辑（纯静态，零第三方依赖）
 *
 * 对接协议：devdocs/plan/MEOWPANEL_PROTOCOL.md（草案，后端未实现）。
 * 所有 fetch 失败都优雅降级为「后端未连接」，不假设后端就绪。
 */
(function () {
  'use strict';

  /* ---------------- 小工具 ---------------- */
  const $ = (sel, root) => (root || document).querySelector(sel);
  const $$ = (sel, root) => Array.prototype.slice.call((root || document).querySelectorAll(sel));

  function storageGet(k) { try { return localStorage.getItem(k); } catch (e) { return null; } }
  function storageSet(k, v) { try { localStorage.setItem(k, v); } catch (e) {} }
  function storageDel(k) { try { localStorage.removeItem(k); } catch (e) {} }

  function esc(s) {
    return String(s == null ? '' : s).replace(/[&<>"']/g, m => ({
      '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;'
    }[m]));
  }
  function fmtBytes(n) {
    if (n == null || isNaN(n)) return '—';
    const u = ['B', 'KB', 'MB', 'GB', 'TB']; let v = Number(n), i = 0;
    while (v >= 1024 && i < u.length - 1) { v /= 1024; i++; }
    return (i === 0 ? v : v.toFixed(1)) + ' ' + u[i];
  }
  function fmtUptime(sec) {
    if (sec == null || isNaN(sec)) return '—';
    sec = Math.floor(sec);
    const d = Math.floor(sec / 86400), h = Math.floor((sec % 86400) / 3600), m = Math.floor((sec % 3600) / 60);
    return (d > 0 ? d + ' 天 ' : '') + h + ' 小时 ' + m + ' 分';
  }
  function fmtTime(ts) { return ts ? new Date(ts * 1000).toLocaleString() : '—'; }
  function debounce(fn, ms) { let t = null; return function () { const a = arguments, c = this; clearTimeout(t); t = setTimeout(() => fn.apply(c, a), ms); }; }
  function pct(p) { return Math.max(0, Math.min(100, p)); }

  /* ---------------- 全局状态 ---------------- */
  const state = {
    style: 'md3', theme: 'dark',
    conn: 'unknown',
    filesRel: '/', filesAbs: null,
    perfTimer: null,               // 性能页轮询
    route: 'perf',
    unauth: false,                 // 鉴权未通过（弹登录页）
    downloadNonce: 0
  };

  /* ---------------- 后端连接状态 ---------------- */
  function setConn(ok) {
    state.conn = ok ? 'ok' : 'bad';
    const dot = $('#conn-dot');
    dot.dataset.state = state.conn;
    $('#conn-text').textContent = ok ? '在线' : '离线';
    $('#offline-banner').hidden = !!ok;
  }

  /* ---------------- API 客户端 ---------------- */
  // 返回 {code,message,status} 形异常；网络/非 JSON → 视为断连
  async function api(method, path, body) {
    let res;
    const headers = {};
    const token = storageGet('meowpanel.token');
    if (token) headers['X-MeowToken'] = token;
    const init = { method: method || 'GET' };
    if (body instanceof FormData) {
      init.body = body;
    } else if (body !== undefined && body !== null) {
      headers['Content-Type'] = 'application/json';
      init.body = JSON.stringify(body);
    }
    if (Object.keys(headers).length) init.headers = headers;
    try {
      res = await fetch(path, init);
    } catch (e) {
      setConn(false);
      throw { code: 'NETWORK', message: '后端未连接', status: 0 };
    }
    let json = null;
    try { json = await res.json(); } catch (e) { json = null; }
    if (!json || typeof json.ok !== 'boolean') {
      // 静态服务器返回 HTML / 404 等
      setConn(res.ok ? true : false);
      throw { code: 'NOT_JSON', message: '后端返回了非 JSON 响应（HTTP ' + res.status + '）', status: res.status };
    }
    if (!json.ok) {
      setConn(true);
      const code = (json.error && json.error.code) || 'ERROR';
      if (code === 'UNAUTHORIZED') authRequired();   // 会话失效/未认证 → 弹登录页
      throw { code: code, message: (json.error && json.error.message) || ('后端错误 ' + code), status: res.status };
    }
    setConn(true);
    return json.data;
  }

  // 下载（返回 blob URL）
  async function apiDownload(path) {
    let res;
    const headers = {};
    const token = storageGet('meowpanel.token');
    if (token) headers['X-MeowToken'] = token;
    try { res = await fetch(path, Object.keys(headers).length ? { headers: headers } : undefined); }
    catch (e) { setConn(false); throw { code: 'NETWORK', message: '后端未连接' }; }
    if (!res.ok) { setConn(true); throw { code: 'HTTP_' + res.status, message: '下载失败（HTTP ' + res.status + '）' }; }
    setConn(true);
    return URL.createObjectURL(await res.blob());
  }

  /* ----------------  toast / 确认弹窗 ---------------- */
  let toastTimer = null;
  function toast(msg, ms) {
    const t = $('#toast');
    t.textContent = msg; t.hidden = false;
    clearTimeout(toastTimer);
    toastTimer = setTimeout(() => { t.hidden = true; }, ms || 2600);
  }
  function confirmDlg(title, body, danger) {
    return new Promise(res => {
      $('#modal-title').textContent = title || '确认';
      $('#modal-body').textContent = body || '';
      const yes = $('#modal-yes'), no = $('#modal-no');
      yes.className = 'btn btn-primary' + (danger ? ' btn-danger' : '');
      const scrim = $('#modal'); scrim.hidden = false;
      const done = v => { scrim.hidden = true; yes.onclick = no.onclick = scrim.onclick = null; res(v); };
      yes.onclick = () => done(true);
      no.onclick = () => done(false);
      scrim.onclick = e => { if (e.target === scrim) done(false); };
    });
  }

  /* ---------------- 鉴权（可选密码登录） ---------------- */
  function authRequired() {           // 任一路由收到 401 → 弹登录页
    state.unauth = true;
    showLogin();
  }
  function showLogin() {
    state.unauth = true;
    const lg = $('#login'); if (lg) lg.hidden = false;
    const ip = $('#login-password'); if (ip) ip.focus();
  }
  function hideLogin() { const lg = $('#login'); if (lg) lg.hidden = true; }
  async function doLogin() {
    const pw = $('#login-password').value;
    const err = $('#login-err');
    if (err) err.hidden = true;
    if (!pw) { if (err) { err.textContent = '请输入密码'; err.hidden = false; } return; }
    const btn = $('#login-btn'); if (btn) btn.disabled = true;
    try {
      const d = await api('POST', '/api/auth/login', { password: pw });
      storageSet('meowpanel.token', d.token);
      state.unauth = false;
      hideLogin();
      toast('已登录');
      if (started) route(); else startApp();
    } catch (e) {
      if (err) { err.textContent = (e && e.message) ? e.message : '登录失败'; err.hidden = false; }
    } finally {
      const b = $('#login-btn'); if (b) b.disabled = false;
    }
  }
  function bindLogin() {
    const ok = $('#login-btn'); if (ok) ok.addEventListener('click', doLogin);
    const ip = $('#login-password'); if (ip) ip.addEventListener('keydown', e => { if (e.key === 'Enter') doLogin(); });
  }
  function passwordDlg(title, body) {
    return new Promise(res => {
      $('#pwdlg-title').textContent = title || '设置面板密码';
      $('#pwdlg-body').textContent = body || '请输入新密码（留空则清除密码）。';
      const inp = $('#pwdlg-input'); inp.value = ''; inp.focus();
      const scrim = $('#pwdlg'); scrim.hidden = false;
      const okb = $('#pwdlg-ok'), cancel = $('#pwdlg-cancel');
      const done = v => { scrim.hidden = true; okb.onclick = cancel.onclick = scrim.onclick = inp.onkeydown = null; res(v); };
      okb.onclick = () => done(inp.value);
      cancel.onclick = () => done(null);
      scrim.onclick = e => { if (e.target === scrim) done(null); };
      inp.onkeydown = e => { if (e.key === 'Enter') done(inp.value); if (e.key === 'Escape') done(null); };
    });
  }
  async function setPanelPassword() {
    const np = await passwordDlg('设置面板密码', '请输入新密码（留空则清除密码）。');
    if (np === null) return;                  // 取消
    try {
      await api('PUT', '/api/settings/panel.auth_pass', { value: np });
      toast(np ? '面板密码已设置' : '面板密码已清除');
      renderSettings();
    } catch (e) { toast('设置失败：' + errText(e)); }
  }
  function bindPwDlg() { /* #content 点击委托在 bindSettings 里处理 pass 按钮；此处无需额外绑定 */ }

  /* ---------------- 主题（MD3/MIUIx × 深/浅） ---------------- */
  function applyTheme(style, theme) {
    state.style = style; state.theme = theme;
    const root = document.documentElement;
    root.dataset.style = style; root.dataset.theme = theme;
    $$('#style-seg .seg-btn').forEach(b => b.classList.toggle('active', b.dataset.style === style));
    $$('#theme-seg .seg-btn').forEach(b => b.classList.toggle('active', b.dataset.theme === theme));
    try { localStorage.setItem('meowpanel.style', style); localStorage.setItem('meowpanel.theme', theme); } catch (e) {}
  }
  async function sendTheme(patch) {
    try { await api('PUT', '/api/theme', patch); }
    catch (e) { toast('主题已本地切换（后端未同步：' + e.message + '）'); }
  }
  async function initTheme() {
    let style = 'md3', theme = 'dark';
    try { style = localStorage.getItem('meowpanel.style') || 'md3'; theme = localStorage.getItem('meowpanel.theme') || 'dark'; } catch (e) {}
    applyTheme(style, theme);
    try {
      const t = await api('GET', '/api/theme');
      applyTheme(t.style || style, t.theme || theme);
    } catch (e) { /* 后端离线，保持本地 */ }
  }
  // 顶栏「风格 / 明暗」切换器：本地立即切换 + 同步后端
  function bindThemeUi() {
    $('#style-seg').addEventListener('click', function (e) {
      const b = e.target.closest('.seg-btn'); if (!b) return;
      applyTheme(b.dataset.style, state.theme);
      sendTheme({ style: b.dataset.style });
    });
    $('#theme-seg').addEventListener('click', function (e) {
      const b = e.target.closest('.seg-btn'); if (!b) return;
      applyTheme(state.style, b.dataset.theme);
      sendTheme({ theme: b.dataset.theme });
    });
  }

  /* ---------------- 页面空态 / 错误提示 ---------------- */
  function emptyState(msg, code) {
    const t = code === 'NO_CARD' ? '未识别到 TF 卡' : (code === 'NOT_IMPLEMENTED' ? '该功能后端尚未实现' : msg);
    return '<div class="empty">' + esc(t) + '</div>';
  }
  function errText(e) {
    if (e && e.code === 'NO_CARD') return '未识别到 TF 卡';
    if (e && e.code === 'NOT_IMPLEMENTED') return '该功能后端尚未实现';
    return (e && e.message) ? e.message : '未知错误';
  }

  /* ---------------- 1. 性能页（2s 轮询 /api/perf） ---------------- */
  function barHtml(p) {
    p = pct(p);
    const c = p >= 90 ? 'danger' : (p >= 70 ? 'warn' : '');
    return '<div class="bar ' + c + '"><span style="width:' + p + '%"></span></div>';
  }
  function stat(label, valueHtml, sub, barPct) {
    return '<div class="stat"><div class="stat-label">' + esc(label) + '</div>' + valueHtml +
      (sub ? '<div class="stat-sub">' + sub + '</div>' : '') +
      (barPct != null ? barHtml(barPct) : '') + '</div>';
  }
  function renderPerfData(page, d) {
    const cpu = d.cpu || {};
    const mem = d.memory || {}, st = d.storage || {}, tf = d.tfcard || {}, tmp = d.temp;
    let h = '<div class="card"><h3 class="card-title">实时性能</h3>';
    h += '<div class="muted">运行时间：' + fmtUptime(d.uptime_sec) + '</div><div class="stat-grid">';
    h += stat('CPU', '<span class="stat-value">' + (cpu.usage == null ? '—' : +cpu.usage.toFixed(1)) + '<span class="stat-unit">%</span></span>',
      cpu.cores != null ? cpu.cores + ' 核 · 负载 ' + (cpu.load ? cpu.load.map(x => (+x).toFixed(2)).join(' / ') : '—') : '',
      cpu.usage || 0);
    const memP = mem.total ? (mem.used / mem.total) * 100 : 0;
    h += stat('内存', '<span class="stat-value">' + fmtBytes((mem.used || 0) * 1024) + '</span><span class="stat-unit">/ ' + fmtBytes((mem.total || 0) * 1024) + '</span>',
      '可用 ' + fmtBytes((mem.available || (mem.free || 0)) * 1024), memP);
    const stP = st.total ? (st.used / st.total) * 100 : 0;
    h += stat('存储 (rootfs)', '<span class="stat-value">' + fmtBytes((st.used || 0) * 1024) + '</span><span class="stat-unit">/ ' + fmtBytes((st.total || 0) * 1024) + '</span>', st.path || '', stP);
    if (tf) {
      if (tf.present) {
        const tfP = tf.total ? (tf.used / tf.total) * 100 : 0;
        h += stat('TF 卡', '<span class="stat-value">' + fmtBytes((tf.used || 0) * 1024) + '</span><span class="stat-unit">/ ' + fmtBytes((tf.total || 0) * 1024) + '</span>',
          fmtBytes((tf.avail || 0) * 1024) + ' 可用 · ' + (tf.filesystem || ''), tfP);
      } else {
        h += stat('TF 卡', '<span class="stat-value">未插卡</span>', '');
      }
    }
    const tmpCpu = tmp && tmp.cpu != null ? +tmp.cpu.toFixed(1) : null;
    h += stat('温度', '<span class="stat-value">' + (tmpCpu == null ? '—' : tmpCpu) + '<span class="stat-unit">℃</span></span>',
      tmp && tmp.board != null ? '板载 ' + (+tmp.board.toFixed(1)) + ' ℃' : '');
    h += '</div></div>';
    page.innerHTML = h;
  }
  async function fetchPerfOnce() {
    const page = $('#perf-page');
    if (!page || state.route !== 'perf') return;
    let d;
    try { d = await api('GET', '/api/perf'); }
    catch (e) { if (page && state.route === 'perf') page.innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    if (state.route === 'perf') renderPerfData(page, d);
  }
  function stopPerf() { if (state.perfTimer) { clearInterval(state.perfTimer); state.perfTimer = null; } }
  function renderPerf() {
    $('#content').innerHTML = '<div class="page" id="perf-page"><p class="placeholder">加载中…</p></div>';
    if (state.perfTimer) stopPerf();
    fetchPerfOnce();
    state.perfTimer = setInterval(fetchPerfOnce, 2000);
  }

  /* ---------------- 2. 亮度 / 音量页 ---------------- */
  let volTimer = null;
  function slur(step) { // step: {key,label,min,max,val}
    return '<div class="card"><h3 class="card-title">' + esc(step.label) + '</h3>' +
      '<div class="field-row"><span class="muted" style="width:44px">' + step.val + '</span>' +
      '<input type="range" min="' + step.min + '" max="' + step.max + '" value="' + step.val + '" data-slider data-key="' + esc(step.key) + '">' +
      '<span class="muted" style="width:44px;text-align:right">' + step.max + '</span></div></div>';
  }
  async function renderBright() {
    $('#content').innerHTML = '<div class="page" id="bright-page"><p class="placeholder">加载设置…</p></div>';
    let bright, vol;
    try {
      bright = await api('GET', '/api/settings/display.brightness');
    } catch (e) { $('#content').innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    try { vol = await api('GET', '/api/settings/audio.volume'); } catch (e) { vol = null; }
    if (state.route !== 'bright') return;
    let h = '<div class="page" id="bright-page">';
    h += slur({ key: 'display.brightness', label: '亮度', min: bright.min || 1, max: bright.max || 100, val: bright.value });
    if (vol) h += slur({ key: 'audio.volume', label: '音量', min: vol.min || 0, max: vol.max || 100, val: vol.value });
    else h += '<p class="muted">音量设置项不可用（后端未实现 audio.volume）</p>';
    h += '<p class="muted">滑条改动自动保存到系统（走 meow_settings_*），与实体设置页同步。</p></div>';
    $('#content').innerHTML = h;
  }
  const saveSetting = debounce(async function (key, value, type) {
    try {
      await api('PUT', '/api/settings/' + key, { value: value });
      toast('已保存 ' + key + ' = ' + value);
    } catch (e) { toast('保存失败：' + errText(e)); }
  }, 400);
  function bindSlider() {
    $('#content').addEventListener('input', function (e) {
      const r = e.target.closest('[data-slider]');
      if (!r) return;
      const row = r.closest('.field-row');
      if (row) row.querySelector('.muted').textContent = r.value;
      saveSetting(r.dataset.key, +r.value, 'int');
    });
  }

  /* ---------------- 2b. 音频页（meow_audiod 状态快照，5s 轮询，只读） ---------------- */
  let audioTimer = null;
  function stopAudio() { if (audioTimer) { clearInterval(audioTimer); audioTimer = null; } }
  function audioPortName(p) {   // audiod numid=9 路由口语义（AUDIOD_DESIGN §5）
    const m = { 0: '空闲', 1: 'Line Out', 2: '3.5mm', 3: '4.4mm 平衡', 4: 'Type-C SPDIF' };
    if (p == null || p < 0) return '—';
    return m[p] || ('端口 ' + p);
  }
  function fmtFrames(n) { return (n == null) ? '—' : Number(n).toLocaleString(); }
  function renderAudioData(page, d) {
    let h = '';
    if (!d || !d.available) {
      h += '<div class="card"><h3 class="card-title">音频服务（meow_audiod）</h3>' +
        '<p class="muted">audiod 不可用（服务未运行或 IPC 不可达）。MeowOS 模式下 audiod 恒在；HibyOS 模式下按门控不启动。</p></div>';
    } else {
      h += '<div class="card"><h3 class="card-title">当前流</h3>';
      if (d.active) {
        h += '<table class="table"><tbody>' +
          row('应用', esc(d.app || '—') + ' <span class="muted">(sid ' + esc(d.sid) + ')</span>') +
          row('采样率', esc(d.rate) + ' Hz') +
          row('声道', esc(d.ch) + ' ch') +
          row('格式', esc(d.fmt || '—')) +
          row('已写帧', fmtFrames(d.written_frames)) +
          row('已播放帧', fmtFrames(d.played_frames)) +
          row('underrun', '<span class="' + (d.underrun > 0 ? 'urgency-hi' : '') + '">' + esc(d.underrun) + '</span>') +
          row('状态', d.paused ? '已暂停' : '播放中') +
          '</tbody></table>';
      } else {
        h += '<p class="muted">当前无活动音频流。</p>';
      }
      h += '</div>';
      h += '<div class="card"><h3 class="card-title">路由与音量</h3><table class="table"><tbody>' +
        row('路由模式', esc(d.route_mode || '—') + (d.route_mode === 'manual' ? '（手动覆盖）' : '（跟随插孔）')) +
        row('输出口', audioPortName(d.port)) +
        row('音量', (d.vol != null && d.vol >= 0 ? esc(d.vol) + ' %' : '—')) +
        '</tbody></table></div>';
    }
    h += '<p class="muted">每 5 秒自动刷新 · 只读展示（测试音请用设备 CLI <code>meow_audio tone</code>，面板不放声）。</p>';
    page.innerHTML = h;
  }
  async function fetchAudioOnce() {
    const page = $('#audio-page');
    if (!page || state.route !== 'audio') return;
    let d;
    try { d = await api('GET', '/api/audio'); }
    catch (e) { if (page && state.route === 'audio') page.innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    if (state.route === 'audio') renderAudioData(page, d);
  }
  function renderAudio() {
    $('#content').innerHTML = '<div class="page" id="audio-page"><p class="placeholder">加载音频状态…</p></div>';
    stopAudio();
    fetchAudioOnce();
    audioTimer = setInterval(fetchAudioOnce, 5000);
  }

  /* ---------------- 3. 文件管理页 ---------------- */
  // 返回带索引的 rel 显示面包屑
  function joinRel(a, b) {
    if (!a || a === '/') return '/' + b;
    return (a.endsWith('/') ? a.slice(0, -1) : a) + '/' + b;
  }
  function crumbHtml(items, cur) { // items: [{name,rel}]
    let h = '<div class="crumbs" id="crumbs">';
    h += '<a data-rel="/" id="crumb-root">根目录</a>';
    items.forEach(it => { h += '<span>/</span><a data-rel="' + esc(it.rel) + '">' + esc(it.name) + '</a>'; });
    return h + '</div>';
  }
  async function navFiles(rel) {
    const page = $('#files-page');
    if (!page) return;
    let relPath = rel || '/';
    page.innerHTML = '<p class="placeholder">加载中…</p>';
    let d;
    try { d = await api('GET', '/api/files?path=' + encodeURIComponent(relPath)); }
    catch (e) { page.innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    state.filesRel = d.rel || relPath; state.filesAbs = d.path;
    let h = crumbHtml(segments(d.rel), d.rel);
    // 白名单快捷入口（根目录下）
    if (d.rel === '/' && d.allowed) {
      h += '<div class="field-row wrap" style="margin-bottom:12px">' +
        d.allowed.map(a => '<button class="btn" data-nav="' + esc('/' + a) + '">' + esc(a) + '</button>').join(' ') + '</div>';
    }
    h += '<div class="field-row wrap" style="margin-bottom:12px">' +
      '<button class="btn" id="file-newdir">新建目录</button>' +
      '<button class="btn" id="file-upload">上传文件</button>' +
      '<button class="btn" id="file-refresh">刷新</button>' +
      '<input type="file" id="file-input" multiple hidden></div>';
    h += '<div class="card"><table class="table"><thead><tr><th>名称</th><th>大小</th><th>修改时间</th><th style="text-align:right">操作</th></tr></thead><tbody>';
    if (!d.items.length) h += '<tr><td colspan="4" class="empty">空目录</td></tr>';
    d.items.forEach(function (it) {
      const isDir = it.type === 'dir';
      const icon = isDir ? '📁' : (it.type === 'file' ? '📄' : '❔');
      h += '<tr><td>' + (isDir ? '<a class="dirlink" data-dir="' + esc(it.name) + '">' : '') + icon + ' ' + esc(it.name) + (isDir ? '</a>' : '') +
        '</td><td class="muted">' + (isDir ? '—' : fmtBytes(it.size)) + '</td><td class="muted">' + fmtTime(it.mtime) + '</td>' +
        '<td><div class="row-actions">' +
        (isDir ? '<button class="btn btn-ghost" data-enter="' + esc(it.name) + '">打开</button>' : '<a class="btn btn-ghost" data-dl="' + esc(it.name) + '" href="#">下载</a>') +
        '<button class="btn btn-ghost" data-ren="' + esc(it.name) + '">重命名</button>' +
        '<button class="btn btn-ghost btn-danger" data-del="' + esc(it.name) + '">删除</button>' +
        '</div></td></tr>';
    });
    h += '</tbody></table></div>';
    page.innerHTML = h;
  }
  function segments(rel) {
    const parts = (rel || '').split('/').filter(Boolean); const out = []; let cur = '';
    parts.forEach(p => { cur += '/' + p; out.push({ name: p, rel: cur }); });
    return out;
  }
  function renderFiles() { $('#content').innerHTML = '<div class="page" id="files-page"></div>'; navFiles(state.filesRel || '/'); }
  function absFor(name) { return state.filesAbs ? (state.filesAbs.endsWith('/') ? state.filesAbs + name : state.filesAbs + '/' + name) : null; }
  function bindFiles() {
    const c = $('#content');
    c.addEventListener('click', async function (e) {
      const t = e.target;
      const enter = t.closest('[data-enter]'); const dl = t.closest('[data-dl]');
      const ren = t.closest('[data-ren]'); const del = t.closest('[data-del]');
      const dirlink = t.closest('[data-dir]'); const nav = t.closest('[data-nav]');
      const crumb = t.closest('[data-rel]');
      const btn = t.closest('button[id]');
      if (crumb) { navFiles(crumb.dataset.rel); return; }
      if (nav) { navFiles(nav.dataset.nav); return; }
      if (dirlink || enter) { const n = (dirlink || enter).dataset.directory || (dirlink || enter).dataset.dir || (dirlink || enter).dataset.enter; navFiles(joinRel(state.filesRel, n)); return; }
      if (dl) {
        const abs = absFor(dl.dataset.dl); if (!abs) return toast('无当前目录');
        doDownload('/api/files/download?path=' + encodeURIComponent(abs), dl.dataset.dl);
        return;
      }
      if (ren) { renameFile(ren.dataset.ren); return; }
      if (del) { removeFile(del.dataset.del); return; }
      if (btn && btn.id === 'file-newdir') { mkdirFile(); return; }
      if (btn && btn.id === 'file-upload') { const fi = $('#file-input'); if (fi) { fi.value = ''; fi.click(); } return; }
      if (btn && btn.id === 'file-refresh') { navFiles(state.filesRel); return; }
    });
    c.addEventListener('change', function (e) {
      if (e.target.id === 'file-input') uploadFiles(e.target.files);
    });
  }
  function doDownload(url, name) {
    return apiDownload(url).then(blobUrl => {
      const a = document.createElement('a'); a.href = blobUrl; a.download = name || 'file';
      document.body.appendChild(a); a.click(); a.remove();
      setTimeout(() => URL.revokeObjectURL(blobUrl), 5000);
    }).catch(e => toast('下载失败：' + errText(e)));
  }
  async function removeFile(name) {
    const abs = absFor(name); if (!abs) return;
    const ok = await confirmDlg('删除 ' + name, '此操作不可撤销，确认删除？\n' + abs, true);
    if (!ok) return;
    try {
      await api('DELETE', '/api/files?path=' + encodeURIComponent(abs));
      toast('已删除 ' + name); navFiles(state.filesRel);
    } catch (e) { toast('删除失败：' + errText(e)); }
  }
  async function renameFile(name) {
    const abs = absFor(name); if (!abs) return;
    const nn = prompt('将「' + name + '」重命名为：', name);
    if (!nn || nn === name) return;
    try {
      await api('POST', '/api/files/rename', { path: abs, new_name: nn });
      toast('已重命名'); navFiles(state.filesRel);
    } catch (e) { toast('重命名失败：' + errText(e)); }
  }
  async function mkdirFile() {
    const abs = state.filesAbs; if (!abs) return;
    const nn = prompt('新建目录名称（将创建于 ' + state.filesRel + '）:', 'newdir');
    if (!nn) return;
    try {
      await api('POST', '/api/files/mkdir', { path: joinRel(abs, nn) });
      toast('已创建 ' + nn); navFiles(state.filesRel);
    } catch (e) { toast('创建失败：' + errText(e)); }
  }
  async function uploadFiles(files) {
    if (!files || !files.length) return;
    const abs = state.filesAbs; if (!abs) return toast('无当前目录');
    const fd = new FormData(); fd.append('path', abs);
    Array.prototype.forEach.call(files, f => fd.append('file', f));
    const n = files.length;
    toast('正在上传 ' + n + ' 个文件…');
    try {
      await api('POST', '/api/files/upload', fd);
      toast('上传完成'); navFiles(state.filesRel);
    } catch (e) { toast('上传失败：' + errText(e)); }
  }

  /* ---------------- 4. 应用管理页 ---------------- */
  function renderApps() {
    $('#content').innerHTML = '<div class="page" id="apps-page"><p class="placeholder">加载应用列表…</p></div>';
    (async function () {
      let d;
      try { d = await api('GET', '/api/apps'); }
      catch (e) { if (state.route === 'apps') $('#content').innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
      if (state.route !== 'apps') return;
      let h = '<div class="page" id="apps-page">';
      h += '<div class="field-row" style="margin-bottom:14px">' +
        '<button class="btn btn-primary" id="app-install">导入 .mpk 安装</button>' +
        '<button class="btn" id="app-refresh">刷新</button>' +
        '<input type="file" id="app-file" accept=".mpk" hidden></div>';
      h += '<div class="app-grid">';
      if (!d.apps.length) h += '<div class="empty" style="grid-column:1/-1">尚未安装任何 MeowAPP</div>';
      d.apps.forEach(a => {
        const ino = esc((a.name || a.package || '?').charAt(0).toUpperCase());
        h += '<div class="app-card" data-pkg="' + esc(a.package || '') + '">' +
          '<div class="app-head"><div class="app-ico">' + ino + '</div>' +
          '<div><div class="app-name">' + esc(a.name || a.package || '未命名') + '</div>' +
          '<div class="app-pkg">' + esc(a.package || '') + '</div></div></div>' +
          '<div class="app-meta">版本 ' + esc(a.version || '—') + (a.invalid ? ' · <span style="color:var(--error)">无效</span>' : '') +
          (a.size ? ' · ' + fmtBytes(a.size) : '') + '</div>' +
          '<div class="app-actions">' +
          '<button class="btn btn-ghost" data-ainfo="' + esc(a.package) + '">详情</button>' +
          '<a class="btn btn-ghost" data-aexport="' + esc(a.package) + '" href="#">导出 .mpk</a>' +
          '<button class="btn btn-danger" data-auninst="' + esc(a.package) + '">卸载</button>' +
          '</div></div>';
      });
      h += '</div>';
      // 本地源 .mpk 安装（后端支持 path 形式）
      h += '<div class="card"><h3 class="card-title">从卡上路径安装</h3>' +
        '<div class="field-row"><input type="text" id="app-install-path" placeholder="如 /MeowOS/tmp/os.meow.hello.mpk">' +
        '<button class="btn" id="app-install-path-go">安装</button></div></div>';
      $('#content').innerHTML = h;
    })();
  }
  function bindApps() {
    const c = $('#content');
    c.addEventListener('click', async function (e) {
      const t = e.target;
      const install = t.closest('#app-install'); const refresh = t.closest('#app-refresh');
      const info = t.closest('[data-ainfo]'); const exp = t.closest('[data-aexport]');
      const uninst = t.closest('[data-auninst]'); const goPath = t.closest('#app-install-path-go');
      if (install) { const fi = $('#app-file'); if (fi) { fi.value = ''; fi.click(); } return; }
      if (refresh) { renderApps(); return; }
      if (info) { appInfo(info.dataset.ainfo); return; }
      if (exp) {
        e.preventDefault();
        if (exp.dataset.busy) return;                 /* 打包期间防连点 */
        exp.dataset.busy = '1';
        const oldTxt = exp.textContent;
        exp.textContent = '打包中…';
        toast('正在打包导出 ' + exp.dataset.aexport + '，请稍候…');
        doDownload('/api/apps/' + exp.dataset.aexport + '/export', exp.dataset.aexport + '.mpk')
          .finally(() => { delete exp.dataset.busy; exp.textContent = oldTxt; });
        return;
      }
      if (uninst) { appUninstall(uninst.dataset.auninst); return; }
      if (goPath) { installFromPath($('#app-install-path').value); return; }
    });
    c.addEventListener('change', function (e) {
      if (e.target.id === 'app-file') installFromFile(e.target.files);
    });
  }
  async function installFromFile(files) {
    if (!files || !files.length) return;
    const fd = new FormData(); fd.append('file', files[0]);
    toast('正在安装 ' + files[0].name + '…');
    try {
      const d = await api('POST', '/api/apps/install', fd);
      toast('已安装 ' + (d.package || '应用') + (d.version ? ' v' + d.version : ''));
      renderApps();
    } catch (e) { toast('安装失败：' + errText(e)); }
  }
  async function installFromPath(p) {
    if (!p) return toast('请输入 .mpk 路径');
    toast('正在安装 ' + p + '…');
    try {
      const d = await api('POST', '/api/apps/install', { path: p });
      toast('已安装 ' + (d.package || '应用')); renderApps();
    } catch (e) { toast('安装失败：' + errText(e)); }
  }
  async function appUninstall(pkg) {
    const ok = await confirmDlg('卸载 ' + pkg, '将移除应用与数据预留（数据默认保留）。确认卸载？', true);
    if (!ok) return;
    try { await api('DELETE', '/api/apps/' + pkg); toast('已卸载 ' + pkg); renderApps(); }
    catch (e) { toast('卸载失败：' + errText(e)); }
  }
  async function appInfo(pkg) {
    try {
      const d = await api('GET', '/api/apps/' + pkg);
      let txt = '包名: ' + d.package + '\n名称: ' + d.name + '\n版本: ' + d.version + '\nexec: ' + d.exec +
        '\nsize: ' + fmtBytes(d.size) + '\n路径: ' + d.path;
      if (d.description) txt += '\n描述: ' + d.description;
      alert(txt);
    } catch (e) { toast('获取详情失败：' + errText(e)); }
  }

  /* ---------------- 4b. 字体管理页（/api/fonts* 专属页） ---------------- */
  function renderFontsPage() {
    $('#content').innerHTML = '<div class="page" id="fonts-page">' +
      '<div class="card"><h3 class="card-title">字体库</h3>' +
      '<div class="field-row" style="margin-bottom:14px">' +
        '<button class="btn btn-primary" id="fpage-import">上传字体库 .tar.gz</button>' +
        '<button class="btn" id="fpage-refresh">刷新</button>' +
        '<input type="file" id="fpage-file" accept=".tar.gz,.tgz,application/gzip" hidden></div>' +
      '<div id="fpage-list"><p class="muted">加载字体库列表…</p></div>' +
      '<p class="muted" style="margin-top:8px">上传 tar.gz（内含 font.png + font.idx + font.json，平铺三件套）→ 校验后解压到 ' +
        '<code>MeowOS/fonts/&lt;family&gt;/&lt;weight&gt;/</code>；同 family/weight 冲突时会要求确认覆盖。' +
        '导入后进设备「设置 → 字体」页，列表自动重扫生效。</p></div></div>';
    loadFontsPage();
  }
  async function loadFontsPage() {
    const box = $('#fpage-list'); if (!box) return;
    let d;
    try { d = await api('GET', '/api/fonts'); }
    catch (e) { box.innerHTML = '<p class="muted">字体库列表加载失败：' + esc(errText(e)) + '</p>'; return; }
    const fs = (d && d.fonts) || [];
    if (!fs.length) { box.innerHTML = '<div class="empty">暂无字库（TF 卡 MeowOS/fonts 下无完整三件套）</div>'; return; }
    let h = '<table class="table"><thead><tr><th>family</th><th>weight</th><th>名称</th><th>tier</th><th>glyph 数</th><th style="text-align:right">操作</th></tr></thead><tbody>';
    fs.forEach(f => {
      h += '<tr><td class="mono">' + esc(f.family || '') + '</td><td class="mono">' + esc(f.weight || '') + '</td>' +
        '<td>' + esc(f.name || '—') + '</td><td class="muted">' + esc(f.tier || '—') + '</td>' +
        '<td class="muted">' + (f.glyph_count ? Number(f.glyph_count).toLocaleString() : '—') + '</td>' +
        '<td><div class="row-actions"><button class="btn btn-ghost" data-fpexport="' + esc(f.family || '') +
        '" data-fpweight="' + esc(f.weight || '') + '">导出</button></div></td></tr>';
    });
    box.innerHTML = h + '</tbody></table>';
  }
  async function importFontPage(files) {
    if (!files || !files.length) return;
    const f = files[0];
    const btn = $('#fpage-import');
    if (btn && btn.disabled) return;                    // 上传中防连点（进度态）
    const fd = new FormData(); fd.append('file', f);
    if (btn) { btn.disabled = true; btn.textContent = '导入中…'; }
    toast('正在导入 ' + f.name + '…');
    let res = null;
    try { res = await api('POST', '/api/fonts/import', fd); }
    catch (err) {
      if (err.code === 'CONFLICT') {
        const ok = await confirmDlg('覆盖字库', '目标字库（同 family/weight）已存在，覆盖导入吗？', true);
        if (ok) {
          try { res = await api('POST', '/api/fonts/import?force=1', fd); }
          catch (e2) { toast('导入失败：' + errText(e2)); }
        }
      } else toast('导入失败：' + errText(err));
    }
    if (btn) { btn.disabled = false; btn.textContent = '上传字体库 .tar.gz'; }
    if (res) {
      toast('已导入 ' + (res.family || '') + '/' + (res.weight || ''));
      if (res.warning) toast(res.warning);
      else if (res.hint) toast(res.hint);
      loadFontsPage();
    }
  }
  function bindFonts() {
    const c = $('#content');
    c.addEventListener('click', function (e) {
      if (e.target.closest('#fpage-import')) { const inp = $('#fpage-file'); if (inp) { inp.value = ''; inp.click(); } return; }
      if (e.target.closest('#fpage-refresh')) { loadFontsPage(); return; }
      const fe = e.target.closest('[data-fpexport]');
      if (fe) {
        if (fe.dataset.busy) return;                    // 打包期间防连点
        fe.dataset.busy = '1';
        const old = fe.textContent; fe.textContent = '打包中…';
        const f = fe.dataset.fpexport, w = fe.dataset.fpweight;
        doDownload('/api/fonts/export?family=' + encodeURIComponent(f) + '&weight=' + encodeURIComponent(w),
          (f || 'font') + '-' + (w || 'regular') + '.font.tar.gz')
          .finally(() => { delete fe.dataset.busy; fe.textContent = old; });
        return;
      }
    });
    c.addEventListener('change', function (e) {
      if (e.target.id === 'fpage-file') importFontPage(e.target.files);
    });
  }

  /* ---------------- 5. 设置镜像页 ---------------- */
  function settingControl(it) {
    const key = it.key;
    if (key === 'panel.auth_pass') {
      const txt = it.set ? '已设置' : '未设置';
      return '<div class="field-row"><div style="flex:1" class="field-label">面板密码<span class="muted">（' + txt + '）</span></div>' +
        '<button class="btn btn-primary" data-skey="panel.auth_pass" data-stype="pass">' + (it.set ? '修改密码' : '设置密码') + '</button></div>';
    }
    if (it.type === 'bool') {
      return '<div class="field-row"><div style="flex:1" class="field-label"><div style="margin:0">' + esc(key) + '</div></div>' +
        '<label class="switch"><input type="checkbox" data-skey="' + esc(key) + '" data-stype="bool" ' + (it.value ? 'checked' : '') + '>' +
        '<span class="track"><span class="thumb"></span></span></label></div>';
    }
    if (it.type === 'int') {
      const mn = (it.min == null ? 0 : it.min), mx = (it.max == null ? 100 : it.max);
      return '<div class="field"><label class="field-label">' + esc(key) + '（' + mn + '–' + mx + '）</label>' +
        '<div class="field-row"><span class="muted" style="width:44px">' + esc(it.value == null ? '' : it.value) + '</span>' +
        '<input type="range" min="' + mn + '" max="' + mx + '" value="' + esc(it.value == null ? mn : it.value) + '" data-skey="' + esc(key) + '" data-stype="int"></div></div>';
    }
    if (it.type === 'enum') {
      const opts = (it.options || []).map(o => '<option value="' + esc(o.name) + '" ' + (o.name === it.value ? 'selected' : '') + '>' + esc(o.label || o.name) + '</option>').join('');
      return '<div class="field"><label class="field-label">' + esc(key) + '</label><select data-skey="' + esc(key) + '" data-stype="enum">' + opts + '</select></div>';
    }
    return '<div class="field"><label class="field-label">' + esc(key) + '</label><input type="text" value="' + esc(it.value == null ? '' : it.value) + '" data-skey="' + esc(key) + '" data-stype="str"></div>';
  }
  async function renderSettings() {
    $('#content').innerHTML = '<div class="page" id="settings-page"><p class="placeholder">加载设置…</p></div>';
    let d;
    try { d = await api('GET', '/api/settings'); }
    catch (e) { if (state.route === 'settings') $('#content').innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    if (state.route !== 'settings') return;
    let h = '<div class="page" id="settings-page">';
    h += '<div class="field-row" style="margin-bottom:14px">' +
      '<button class="btn btn-danger" id="set-restore">恢复全部默认</button>' +
      '<button class="btn" id="set-refresh">刷新</button></div>';
    const items = d.items || [];
    // 面板鉴权（可选防护）单独一卡
    const authItems = items.filter(x => x.key === 'panel.auth_enabled' || x.key === 'panel.auth_pass');
    if (authItems.length) {
      h += '<div class="card"><h3 class="card-title">面板鉴权（可选防护）</h3>' + authItems.map(settingControl).join('') +
        '<p class="muted" style="margin-top:8px">开启后访问面板需密码登录；密码以加盐哈希存储，不落明文。重启/关机/OTA 等危险操作亦需会话。</p></div>';
    }
    const rest = items.filter(x => x.key !== 'panel.auth_enabled' && x.key !== 'panel.auth_pass');
    // 按类型分组展示（bool 独立一卡，int/enum/str 各自卡片），便于查看
    const groups = [['开关/布尔', rest.filter(x => x.type === 'bool')],
                    ['数值/滑条', rest.filter(x => x.type === 'int')],
                    ['枚举/选择', rest.filter(x => x.type === 'enum')],
                    ['字符串/路径', rest.filter(x => x.type === 'str')]];
    groups.forEach(function (g) {
      if (!g[1].length) return;
      h += '<div class="card"><h3 class="card-title">' + g[0] + '</h3>' + g[1].map(settingControl).join('') + '</div>';
    });
    // 字体库（.zip 导入 / 导出）
    h += '<div class="card" id="fonts-card"><h3 class="card-title">字体库（.tar.gz 导入 / 导出）</h3>' +
      '<div class="field-row"><button class="btn" id="font-import">导入字体库 .tar.gz</button>' +
      '<input type="file" id="font-file" accept=".tar.gz,.tgz,application/gzip" hidden></div>' +
      '<div id="font-list"><p class="muted">加载字体库列表…</p></div>' +
      '<p class="muted" style="margin-top:8px">导入 tar.gz（内含 font.png + font.idx + font.json）→ 校验后解压到 MeowOS/fonts/&lt;family&gt;/&lt;weight&gt;/；导出把该三件套打包为 tar.gz。导入后进设备「设置 → 字体」页列表自动重扫生效。</p></div>';
    h += '</div>';
    $('#content').innerHTML = h;
    loadFonts();
  }
  async function loadFonts() {
    const box = $('#font-list'); if (!box) return;
    let d;
    try { d = await api('GET', '/api/fonts'); }
    catch (e) { box.innerHTML = '<p class="muted">字体库列表加载失败：' + esc(errText(e)) + '</p>'; return; }
    const fs = (d && d.fonts) || [];
    if (!fs.length) { box.innerHTML = '<p class="muted">暂无字库（TF 卡 MeowOS/fonts 下无完整三件套）。</p>'; return; }
    box.innerHTML = fs.map(f => {
      const nm = esc(f.name || f.family || '');
      const meta = esc((f.family || '') + '/' + (f.weight || '') + (f.tier ? ' · ' + f.tier : '') + (f.glyph_count ? ' · ' + f.glyph_count + ' 字' : ''));
      return '<div class="field-row"><div style="flex:1;overflow:hidden;text-overflow:ellipsis">' +
        '<div>' + nm + '</div><div class="muted">' + meta + '</div></div>' +
        '<button class="btn" data-fexport="' + esc(f.family || '') + '" data-fweight="' + esc(f.weight || '') + '">导出</button></div>';
    }).join('');
  }
  async function importFont(files) {
    if (!files || !files.length) return;
    const f = files[0];
    const fd = new FormData(); fd.append('file', f);
    toast('正在导入 ' + f.name + '…');
    let res;
    try { res = await api('POST', '/api/fonts/import', fd); }
    catch (err) {
      if (err.code === 'CONFLICT') {
        const ok = await confirmDlg('覆盖字库', '目标字库已存在，覆盖导入吗？', true);
        if (!ok) return;
        try { res = await api('POST', '/api/fonts/import?force=1', fd); }
        catch (e2) { toast('导入失败：' + errText(e2)); return; }
      } else { toast('导入失败：' + errText(err)); return; }
    }
    toast('已导入 ' + ((res && res.family) || '') + '/' + ((res && res.weight) || ''));
    if (res && res.hint) toast(res.hint);
    loadFonts();
  }
  function bindSettings() {
    const c = $('#content');
    c.addEventListener('input', function (e) {
      const r = e.target.closest('[data-stype="int"]'); if (!r) return;
      const row = r.closest('.field-row'); if (row) row.querySelector('.muted').textContent = r.value;
      updateSetting(r.dataset.skey, +r.value, 'int');
    });
    c.addEventListener('change', function (e) {
      if (e.target.id === 'font-file') { importFont(e.target.files); return; }
      const t = e.target;
      const sk = t.dataset.skey; if (!sk) return;
      if (t.dataset.stype === 'bool') updateSetting(sk, t.checked, 'bool');
      else if (t.dataset.stype === 'enum') updateSetting(sk, t.value, 'enum');
      else if (t.dataset.stype === 'str') updateSetting(sk, t.value, 'str');
    });
    c.addEventListener('click', async function (e) {
      if (e.target.closest('#font-import')) { const inp = $('#font-file'); if (inp) { inp.value = ''; inp.click(); } return; }
      const fe = e.target.closest('[data-fexport]');
      if (fe) {
        const f = fe.dataset.fexport, w = fe.dataset.fweight;
        doDownload('/api/fonts/export?family=' + encodeURIComponent(f) + '&weight=' + encodeURIComponent(w), (f || 'font') + '-' + (w || 'regular') + '.font.tar.gz');
        return;
      }
      if (e.target.closest('[data-stype="pass"]')) { setPanelPassword(); return; }
      if (e.target.closest('#set-restore')) {
        const ok = await confirmDlg('恢复全部默认', '将把全部设置恢复为出厂默认（含主题/亮度/音量）。继续？', true);
        if (!ok) return;
        try { await api('POST', '/api/settings/restore'); toast('已恢复默认'); renderSettings(); }
        catch (err) { toast('恢复失败：' + errText(err)); }
      } else if (e.target.closest('#set-refresh')) { renderSettings(); }
    });
  }
  const updateSetting = debounce(async function (key, value, type) {
    try { await api('PUT', '/api/settings/' + key, { value: value }); toast('已保存 ' + key); }
    catch (e) { toast('保存失败：' + errText(e)); }
  }, 350);

  /* ---------------- 6. 远程控制页 ---------------- */
  function renderRemote() {
    const keys = [
      { code: 115, label: '音量 +', ico: '🔊' },
      { code: 114, label: '音量 −', ico: '🔉' },
      { code: 116, label: '电源（单击）', ico: '⏻' },
      { code: 164, label: '播放/暂停', ico: '⏯' },
      { code: 163, label: '下一曲', ico: '⏭' },
      { code: 165, label: '上一曲', ico: '⏮' },
      { code: 158, label: '返回', ico: '↩' },
      { code: 172, label: '主页', ico: '⌂' }
    ];
    let h = '<div class="page" id="remote-page">';
    h += '<div class="card"><h3 class="card-title">模拟按键</h3>' +
      '<p class="muted">行为与本地按键一致（设备端系统统一接管）。长按电源将触发电源菜单。</p>' +
      '<div class="key-grid">' + keys.map(k =>
        '<button class="key-btn" data-code="' + k.code + '"><span class="k-ico">' + k.ico + '</span>' + esc(k.label) + '</button>'
      ).join('') + '</div></div>';
    h += '<div class="card"><h3 class="card-title">电源长按（电源菜单）</h3>' +
      '<div class="field-row" style="gap:10px"><button class="btn btn-primary" data-powerlong="1">长按电源 3s（电源菜单）</button>' +
      '<span class="muted">发送 code=116 · press=long · ms=3000</span></div></div>';
    h += '</div>';
    $('#content').innerHTML = h;
  }
  async function sendKey(code, press, ms) {
    try { await api('POST', '/api/key/' + code, { press: press || 'tap', ms: ms }); toast('已发送 键 ' + code); }
    catch (e) { toast('发送失败：' + errText(e)); }
  }
  function bindRemote() {
    $('#content').addEventListener('click', function (e) {
      const kb = e.target.closest('[data-code]'); if (kb) { sendKey(kb.dataset.code, 'tap'); return; }
      const pl = e.target.closest('[data-powerlong]'); if (pl) { sendKey(116, 'long', 3000); return; }
    });
  }

  /* ---------------- 7. 系统信息 / OTA 页 ---------------- */
  async function renderSystem() {
    $('#content').innerHTML = '<div class="page" id="system-page"><p class="placeholder">加载系统信息…</p></div>';
    let d;
    try { d = await api('GET', '/api/system'); }
    catch (e) { if (state.route === 'system') $('#content').innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    if (state.route !== 'system') return;
    const net = d.network || {}; const wf = net.wifi || {}; const bt = net.bluetooth || {}; const ota = d.ota || {};
    let h = '<div class="page" id="system-page">';
    h += '<div class="card"><h3 class="card-title">系统信息</h3><table class="table"><tbody>' +
      row('MeowOS 版本', esc(d.version || '—')) + row('内核', esc(d.kernel || '—')) + row('架构', esc(d.arch || '—')) +
      row('主机名', esc(d.hostname || '—')) + row('运行时间', fmtUptime(d.uptime_sec)) +
      row('默认启动', esc((d.boot && d.boot.default) || '—')) +
      '</tbody></table></div>';
    h += '<div class="card"><h3 class="card-title">网络</h3><table class="table"><tbody>' +
      row('WiFi', wf.connected ? esc(wf.ssid || '已连接') + ' · ' + esc(wf.ip || '—') + (wf.rssi != null ? ' · ' + wf.rssi + 'dBm' : '') : '未连接') +
      row('蓝牙', bt.available ? ((bt.powered ? '已开启' : '已关闭') + (bt.connected ? ' · 已连接' : '')) : '无蓝牙') +
      row('mDNS', esc(net.hostname_local || '—')) +
      '</tbody></table></div>';
    h += '<div class="card"><h3 class="card-title">升级</h3>' +
      '<p class="muted">当前 ' + esc(ota.current || d.version || '—') +
      (ota.available ? ' · 发现新版本 ' + esc(ota.latest || '') : ' · 已是最新') + '</p>' +
      '<div class="field-row" style="gap:10px"><button class="btn btn-primary" id="sys-ota-check">检查升级</button>' +
      '<button class="btn btn-danger" id="sys-ota">⚠️ 升级</button></div></div>';
    h += '<div class="card danger-box"><h3 class="card-title">危险操作</h3>' +
      '<div class="field-row" style="gap:10px"><button class="btn btn-danger" id="sys-reboot">重启</button>' +
      '<button class="btn btn-danger" id="sys-shutdown">关机</button></div>' +
      '<p class="warn-note">⚠️ 重启/关机/升级均为高风险操作，请先保存好正在进行的任务。</p></div>';
    h += '</div>';
    $('#content').innerHTML = h;
  }
  function row(k, v) { return '<tr><td class="muted" style="width:120px">' + k + '</td><td>' + v + '</td></tr>'; }
  function bindSystem() {   // init 一次性委托绑定（不随渲染累积）
    $('#content').addEventListener('click', async function (e) {
      if (e.target.closest('#sys-reboot')) {
        if (await confirmDlg('确认重启', '系统将立即重启，请在浏览器中关闭本页。', true))
          try { await api('POST', '/api/system/reboot', {}); toast('已请求重启'); } catch (err) { toast('重启失败：' + errText(err)); }
        return;
      }
      if (e.target.closest('#sys-shutdown')) {
        if (await confirmDlg('确认关机', '系统将立即关机，请在浏览器中关闭本页。', true))
          try { await api('POST', '/api/system/shutdown', {}); toast('已请求关机'); } catch (err) { toast('关机失败：' + errText(err)); }
        return;
      }
      if (e.target.closest('#sys-ota')) {
        if (await confirmDlg('确认升级', '⚠️ 升级中断可能导致系统无法启动，请确保已连接电源。确认开始升级？', true))
          try { await api('POST', '/api/system/ota', {}); toast('已触发升级任务'); } catch (err) { toast('升级失败：' + errText(err)); }
        return;
      }
      if (e.target.closest('#sys-ota-check')) {
        // 检查升级只读，用 GET /api/system 读 ota.available/latest；勿 POST /api/system/ota（那是触发升级）
        try { const r = await api('GET', '/api/system'); const o = r.ota || {}; toast(o.available ? '发现新版本 ' + o.latest : '已是最新版本'); }
        catch (err) { toast('检查失败：' + errText(err)); }
        return;
      }
    });
  }

  /* ---------------- 8. 日志页 ---------------- */
  async function renderLogs() {
    $('#content').innerHTML = '<div class="page" id="logs-page"><p class="placeholder">加载日志列表…</p></div>';
    let d;
    try { d = await api('GET', '/api/logs'); }
    catch (e) { if (state.route === 'logs') $('#content').innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    if (state.route !== 'logs') return;
    let h = '<div class="page" id="logs-page">';
    h += '<div class="card"><h3 class="card-title">日志文件（MeowOS/logs）</h3>';
    h += '<div class="field-row" style="margin-bottom:12px"><span class="muted">' + esc(d.dir || '') + '</span></div>';
    h += '<table class="table"><thead><tr><th>文件</th><th>大小</th><th>修改时间</th><th style="text-align:right">操作</th></tr></thead><tbody>';
    if (!d.files.length) h += '<tr><td colspan="4" class="empty">暂无日志</td></tr>';
    d.files.forEach(f => {
      h += '<tr><td class="mono">' + esc(f.name) + '</td><td class="muted">' + fmtBytes(f.size) + '</td><td class="muted">' + fmtTime(f.mtime) + '</td>' +
        '<td><div class="row-actions"><button class="btn btn-ghost" data-log="' + esc(f.name) + '">查看</button></div></td></tr>';
    });
    h += '</tbody></table></div><pre class="log-view" id="log-view" hidden></pre></div>';
    $('#content').innerHTML = h;
  }
  function bindLogs() {
    $('#content').addEventListener('click', async function (e) {
      const t = e.target.closest('[data-log]'); if (!t) return;
      const p = $('#log-view');
      try {
        const d = await api('GET', '/api/logs/read?file=' + encodeURIComponent(t.dataset.log) + '&lines=400');
        p.hidden = false; p.textContent = (d.lines || []).join('\n') + (d.truncated ? '\n…（更多行被截断）' : '');
      } catch (err) { toast('查看失败：' + errText(err)); }
    });
  }

  /* ---------------- 9. 通知页 ---------------- */
  async function renderNotif() {
    $('#content').innerHTML = '<div class="page" id="notif-page"><p class="placeholder">加载通知…</p></div>';
    let d;
    try { d = await api('GET', '/api/notifications'); }
    catch (e) { if (state.route === 'notif') $('#content').innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    if (state.route !== 'notif') return;
    let h = '<div class="page" id="notif-page">';
    h += '<div class="field-row" style="margin-bottom:14px"><button class="btn" id="notif-refresh">刷新</button>' +
      '<button class="btn btn-danger" id="notif-clear">清空通知</button></div>';
    const list = d.notifications || [];
    if (!list.length) h += '<div class="empty">暂无通知</div>';
    list.forEach(n => {
      const urg = n.urgency >= 2 ? '高' : (n.urgency === 1 ? '中' : '低');
      h += '<div class="notif" data-id="' + esc(n.id) + '"><div class="n-ico">' + esc((n.app_name || '?').charAt(0).toUpperCase()) + '</div>' +
        '<div class="n-body"><div class="n-title">' + esc(n.summary || n.app_name || '通知') + '</div>' +
        (n.body ? '<div class="n-text">' + esc(n.body) + '</div>' : '') +
        '<div class="n-meta"><span>' + esc(n.app_name || '') + '</span><span>' + fmtTime(n.ts) + '</span>' +
        '<span class="' + (n.urgency >= 2 ? 'urgency-hi' : '') + '">紧急度 ' + urg + '</span>' +
        (n.progress != null ? '<span>进度 ' + n.progress + '%</span>' : '') +
        (n.ongoing ? '<span>进行中</span>' : '') + '</div></div>' +
        '<button class="btn btn-ghost" data-ndel="' + esc(n.id) + '">清除</button></div>';
    });
    h += '</div>';
    $('#content').innerHTML = h;
  }
  function bindNotif() {
    $('#content').addEventListener('click', async function (e) {
      if (e.target.closest('#notif-refresh')) { renderNotif(); return; }
      if (e.target.closest('#notif-clear')) {
        if (await confirmDlg('清空通知', '将清空全部通知。确认？', true))
          try { await api('POST', '/api/notifications/dismiss_all'); toast('已清空'); renderNotif(); }
          catch (err) { toast('清空失败：' + errText(err)); }
        return;
      }
      const del = e.target.closest('[data-ndel]'); if (del) {
        try { await api('DELETE', '/api/notifications/' + del.dataset.ndel); toast('已清除'); renderNotif(); }
        catch (err) { toast('清除失败：' + errText(err)); }
      }
    });
  }

  /* ---------------- 10. 实时屏幕 / 点击遥控 ----------------
   * 轮询改「上一帧到了再取下一帧」（链式 setTimeout，绝不堆积/重叠）：
   * 每帧下载完成后按目标周期自校正 delay（周期 = max(0, interval - 请求耗时)），
   * 故名义 fps 被尊重，且请求变慢时自动退化为 1/请求耗时。 */
  let screenTimer = null, screenBusy = false, screenOn = false;
  let screenObjUrl = null, screenFps = 1;
  let screenLastMs = 0, screenMeasFps = 0;      // 实测帧率（帧间间隔 EMA）
  let screenDelta = false, screenCanvasRef = null, screenCanvasReady = false;   // 增量模式（canvas 叠加）
  function stopScreenPoll() {
    screenOn = false;
    if (screenTimer) { clearTimeout(screenTimer); screenTimer = null; }
  }
  function restartScreenPoll() {
    screenOn = true;
    if (screenTimer) { clearTimeout(screenTimer); screenTimer = null; }
    // 请求在途时不重复启动（避免并发请求）；在途帧结束后会按最新 screenFps 自续
    if (!screenBusy) screenTimer = setTimeout(fetchScreen, 0);
  }
  async function fetchScreen() {
    if (screenBusy) return;
    screenBusy = true;
    const t0 = performance.now();
    let statusMsg = '';
    try {
      const headers = {};
      const token = storageGet('meowpanel.token');
      if (token) headers['X-MeowToken'] = token;
      const deltaQ = screenDelta ? '&delta=1' : '';
      const res = await fetch('/api/screen.jpeg?t=' + Date.now() + '&q=70' + deltaQ,
        Object.keys(headers).length ? { headers: headers } : undefined);
      if (!res.ok) { $('#screen-status').textContent = '获取失败（HTTP ' + res.status + '）'; return; }
      const hd = (k) => res.headers.get(k);
      if (screenDelta) {
        const isDelta = hd('X-Meow-Delta') === '1';
        const full = hd('X-Meow-Full') === '1';
        const changed = parseInt(hd('X-Meow-Changed') || '-1', 10);
        const fw = parseInt(hd('X-Meow-W') || '480', 10);
        const fh = parseInt(hd('X-Meow-H') || '720', 10);
        const blob = await res.blob();
        if (!isDelta || full) {                        // 整帧（或旧后端无 delta 头）→ 播种/替换 canvas
          const img = await createImgFromBlob(blob);
          const cv = ensureScreenCanvas(fw, fh);
          if (cv) { cv.getContext('2d').drawImage(img, 0, 0, fw, fh); screenCanvasReady = true; }
          statusMsg = '已更新' + (changed >= 0 ? '（整帧）' : '');
        } else if (!screenCanvasReady) {               // 尚未播种：取一整帧再继续
          await seedScreenCanvas(fw, fh);
          if (screenCanvasReady) statusMsg = '已更新（播种）';
        } else if (changed === 0) {                    // 无变化：跳过叠加
          statusMsg = '无变化';
        } else {                                       // 子图叠加
          const subX = parseInt(hd('X-Meow-Sub-X') || '0', 10);
          const subY = parseInt(hd('X-Meow-Sub-Y') || '0', 10);
          const subW = parseInt(hd('X-Meow-Sub-W') || fw, 10);
          const subH = parseInt(hd('X-Meow-Sub-H') || fh, 10);
          const img = await createImgFromBlob(blob);
          const cv = ensureScreenCanvas(fw, fh);
          if (cv) cv.getContext('2d').drawImage(img, subX, subY, subW, subH);
          statusMsg = '已更新（增量 ' + changed + ' 块）';
        }
      } else {
        const blob = await res.blob();
        const url = URL.createObjectURL(blob);
        const img = $('#screen-img');
        if (!img) { URL.revokeObjectURL(url); return; }
        img.src = url;
        if (screenObjUrl) URL.revokeObjectURL(screenObjUrl);
        screenObjUrl = url;
        statusMsg = '已更新';
      }
      // 实测帧率：上一帧到本帧间隔的 EMA（首帧无间隔）
      const now = performance.now();
      if (screenLastMs) {
        const dt = (now - screenLastMs) / 1000;
        screenMeasFps = screenMeasFps ? screenMeasFps * 0.7 + (1 / dt) * 0.3 : 1 / dt;
      }
      screenLastMs = now;
      $('#screen-status').textContent = statusMsg + (screenMeasFps ? ' · ' + screenMeasFps.toFixed(1) + ' fps' : '') + ' · ' + new Date().toLocaleTimeString();
    } catch (e) {
      $('#screen-status').textContent = '后端未连接';
    }
    screenBusy = false;
    // 自校正续链（本轮耗时计入周期，保证名义 fps）
    if (screenOn) {
      const intervalMs = Math.max(500, Math.round(1000 / screenFps));
      const wait = Math.max(0, intervalMs - (performance.now() - t0));
      screenTimer = setTimeout(fetchScreen, wait);
    }
  }
  // 增量模式助手：blob → Image（一次性 objectURL，加载后即回收）
  async function createImgFromBlob(blob) {
    const url = URL.createObjectURL(blob);
    try {
      const img = new Image();
      await new Promise((resolve, reject) => { img.onload = resolve; img.onerror = reject; img.src = url; });
      return img;
    } finally { URL.revokeObjectURL(url); }
  }
  function ensureScreenCanvas(fw, fh) {
    let cv = screenCanvasRef;
    if (!cv) cv = screenCanvasRef = $('#screen-canvas');
    if (!cv) return null;
    if (cv.width !== fw || cv.height !== fh) { cv.width = fw; cv.height = fh; }
    return cv;
  }
  async function seedScreenCanvas(fw, fh) {
    const headers = {};
    const token = storageGet('meowpanel.token');
    if (token) headers['X-MeowToken'] = token;
    const res = await fetch('/api/screen.jpeg?t=' + Date.now() + '&q=70',
      Object.keys(headers).length ? { headers: headers } : undefined);
    if (!res.ok) return false;
    const img = await createImgFromBlob(await res.blob());
    const cv = ensureScreenCanvas(fw, fh);
    if (!cv) return false;
    cv.getContext('2d').drawImage(img, 0, 0, fw, fh);
    screenCanvasReady = true;
    return true;
  }
  function applyScreenDeltaDom() {
    const img = $('#screen-img'), cv = $('#screen-canvas');
    if (!img || !cv) return;
    if (screenDelta) { img.style.display = 'none'; cv.style.display = 'block'; }
    else { img.style.display = 'block'; cv.style.display = 'none'; }
  }
  async function screenTap(e) {
    const img = $('#screen-img'), cv = $('#screen-canvas');
    const useCanvas = screenDelta && cv && cv.style.display !== 'none';
    const el = useCanvas ? cv : img;
    if (!el) return;
    const r = el.getBoundingClientRect();
    if (!r.width || !r.height) return;
    // 前端按 480x720（设备原生分辨率）换算
    const nx = Math.round((e.clientX - r.left) / r.width * 480);
    const ny = Math.round((e.clientY - r.top) / r.height * 720);
    const nxCL = Math.max(0, Math.min(479, nx)), nyCL = Math.max(0, Math.min(719, ny));
    try {
      const d = await api('POST', '/api/input/tap', { x: nxCL, y: nyCL });
      if (d && d.dispatched) toast('已注入 (' + nxCL + ',' + nyCL + ')');
      else if (d && d.reason === 'local_touch_active') toast('本机触摸中，注入已暂停');
      else toast('注入未派发');
    } catch (err) { toast('注入失败：' + errText(err)); }
  }
  function renderScreen() {
    screenFps = parseFloat(storageGet('screen.fps') || '1');
    if (!(screenFps >= 0.2 && screenFps <= 2)) screenFps = 1;
    let h = '<div class="page" id="screen-page">';
    h += '<div class="card"><h3 class="card-title">实时画面</h3>' +
      '<p class="muted">点击画面 = 在设备上点击该处。本机有人触摸时，注入自动暂停 5 秒；设备息屏请先点亮。</p>' +
      '<div class="screen-frame">' +
        '<img id="screen-img" alt="设备实时画面">' +
        '<canvas id="screen-canvas" style="display:none"></canvas>' +
      '</div>' +
      '<div class="field-row" style="margin-top:12px">' +
        '<label class="muted" for="screen-fps">刷新率</label>' +
        '<input type="range" id="screen-fps" min="0.2" max="2" step="0.1" value="' + screenFps + '">' +
        '<span class="muted" id="screen-fps-lbl" style="min-width:56px">' + screenFps.toFixed(1) + ' fps</span>' +
      '</div>' +
      '<div class="field-row" style="margin-top:6px">' +
        '<label class="muted"><input type="checkbox" id="screen-delta"' + (screenDelta ? ' checked' : '') + '> 增量传输（省流量）</label>' +
      '</div>' +
      '<p class="muted" id="screen-status">载入中…</p>' +
    '</div></div>';
    $('#content').innerHTML = h;
    screenCanvasRef = null; screenCanvasReady = false;    // 切换页面重置增量 canvas 状态
    const slider = $('#screen-fps');
    slider.addEventListener('input', function () {
      const v = parseFloat(slider.value);
      screenFps = v; storageSet('screen.fps', String(v));
      $('#screen-fps-lbl').textContent = v.toFixed(1) + ' fps';
      restartScreenPoll();
    });
    const deltaBox = $('#screen-delta');
    deltaBox.addEventListener('change', function () {
      screenDelta = deltaBox.checked;
      screenCanvasRef = null; screenCanvasReady = false;   // 换增量模式：强制重新播种
      applyScreenDeltaDom();
      restartScreenPoll();
    });
    $('#screen-img').addEventListener('click', screenTap);
    $('#screen-canvas').addEventListener('click', screenTap);
    applyScreenDeltaDom();
    // restartScreenPoll 已排程首帧（上一帧到了再取下一帧），勿再显式 fetch 以免双发
    restartScreenPoll();
  }
  function bindScreen() {
    // 页面隐藏（切到其它标签页）时停刷；回到本页继续
    document.addEventListener('visibilitychange', function () {
      if (document.hidden) stopScreenPoll();
      else if (state.route === 'screen') restartScreenPoll();
    });
  }

  /* ---------------- 路由 ---------------- */
  const ROUTES = {
    perf: { title: '实时性能', render: renderPerf, bind: null },
    bright: { title: '亮度 · 音量', render: renderBright, bind: null },
    audio: { title: '音频状态', render: renderAudio, bind: null },
    files: { title: '文件管理', render: renderFiles, bind: bindFiles },
    apps: { title: 'MeowAPPs 管理', render: renderApps, bind: bindApps },
    fonts: { title: '字体管理', render: renderFontsPage, bind: bindFonts },
    settings: { title: '设置镜像', render: renderSettings, bind: bindSettings },
    remote: { title: '远程控制', render: renderRemote, bind: bindRemote },
    screen: { title: '实时屏幕', render: renderScreen, bind: bindScreen },
    system: { title: '系统信息 / 升级', render: renderSystem, bind: bindSystem },
    logs: { title: '系统日志', render: renderLogs, bind: bindLogs },
    notif: { title: '通知中心', render: renderNotif, bind: bindNotif }
  };
  // 一次性绑定（各菜单 click / 侧栏）；页面内交互用 #content 事件委托（已各自绑定）
  function bindNav() {
    $$('.nav-item').forEach(b => b.addEventListener('click', () => { location.hash = '#/' + b.dataset.route; }));
    $('#menu-btn').addEventListener('click', () => $('#sidebar').classList.toggle('open'));
  }
  function route() {
    if (state.unauth) { showLogin(); return; }   // 未认证 → 登录页
    const id = (location.hash || '#/perf').replace('#/', '').split('?')[0] || 'perf';
    const r = ROUTES[id] || ROUTES.perf;
    state.route = id;
    stopPerf();
    stopAudio();
    stopScreenPoll();
    $$('.nav-item').forEach(b => b.classList.toggle('active', b.dataset.route === id));
    $('#page-title').textContent = r.title;
    r.render();
  }

  /* ---------------- 启动 ---------------- */
  let started = false;
  function startApp() {
    if (started) { route(); return; }
    started = true;
    initTheme();
    window.addEventListener('hashchange', route);
    route();
  }
  async function init() {
    bindNav();
    bindThemeUi();
    bindSlider();
    bindFiles(); bindApps(); bindFonts(); bindSettings(); bindRemote(); bindScreen(); bindSystem(); bindLogs(); bindNotif();
    bindLogin();
    bindPwDlg();
    // 首次进入探鉴权状态：启用且无有效会话 → 登录页；否则直接进应用
    let st = null;
    try { st = await api('GET', '/api/auth/status'); } catch (e) { st = null; }
    if (st && st.auth_enabled && !st.session) { showLogin(); return; }
    startApp();
  }
  document.addEventListener('DOMContentLoaded', init);
})();