/** Lingniu Vehicle Map — live data from the vehicle open platform. */

const i18n = {
  zh: {
    vehicleModeTitle: '车辆网络', stationModeTitle: '加氢站网络',
    kpiTotalFleet: '车辆总数', kpiOnlineFleet: '当前在线运行', kpiDailyMileage: '今日运营里程',
    unitVehicles: '辆', unitStations: '座', btnVehicle: '车辆', btnStation: '加氢站',
    themeDark: '深色', themeLight: '浅色', legendPrimary: '核心节点 (>100)',
    legendMid: '重点节点 (20-100)', legendLow: '普通节点 (<20)', btnResetView: '复位视角',
    btn3dView: '3D/2D 视角', btnNationalView: '全国视图',
    mapFooterGis: '地图引擎: 羚牛氢能 GIS (AMap 3D Engine)',
    mapFooterStatus: '数据来源: 羚牛车辆数据开放平台', hintNational: '视角: 全国运营态势',
    panelStatusVehicle: '车辆运营状态分布', panelStatusStation: '加氢站类型分布',
    panelRankVehicle: '省级车辆分布 TOP 排名', panelRankStation: '加氢站省份 TOP 排名',
    statusRunning: '运行中', statusStopped: '静止中', statusOffline: '离线',
    stationCooperative: '合作站', stationExternal: '外部站', stationTotal: '全部站点',
    rankByFleet: '按数量', rankByDist: '按里程', onlineText: '在线', unitTail: '台'
  },
  en: {
    vehicleModeTitle: 'Vehicle Network', stationModeTitle: 'H₂ Station Network',
    kpiTotalFleet: 'Total Fleet', kpiOnlineFleet: 'Active Online', kpiDailyMileage: 'Today Mileage',
    unitVehicles: 'units', unitStations: 'stations', btnVehicle: 'Fleet', btnStation: 'H₂ Stations',
    themeDark: 'Dark', themeLight: 'Light', legendPrimary: 'Core (>100)',
    legendMid: 'Key (20-100)', legendLow: 'Standard (<20)', btnResetView: 'Reset View',
    btn3dView: '3D/2D View', btnNationalView: 'National View',
    mapFooterGis: 'Engine: Lingniu H₂ GIS (AMap 3D Engine)',
    mapFooterStatus: 'Source: Lingniu Vehicle Open Platform', hintNational: 'View: National Overview',
    panelStatusVehicle: 'Fleet Status Breakdown', panelStatusStation: 'Station Type Breakdown',
    panelRankVehicle: 'Top Provinces by Fleet', panelRankStation: 'Top Provinces by Stations',
    statusRunning: 'Active', statusStopped: 'Idle', statusOffline: 'Offline',
    stationCooperative: 'Partners', stationExternal: 'External', stationTotal: 'All Stations',
    rankByFleet: 'By Count', rankByDist: 'By Mileage', onlineText: 'Online', unitTail: 'units'
  }
};

const PROVINCE_ENGLISH = {
  北京: 'Beijing', 天津: 'Tianjin', 上海: 'Shanghai', 重庆: 'Chongqing', 河北: 'Hebei', 河南: 'Henan',
  云南: 'Yunnan', 辽宁: 'Liaoning', 黑龙江: 'Heilongjiang', 湖南: 'Hunan', 安徽: 'Anhui', 山东: 'Shandong',
  新疆: 'Xinjiang', 江苏: 'Jiangsu', 浙江: 'Zhejiang', 江西: 'Jiangxi', 湖北: 'Hubei', 广西: 'Guangxi',
  甘肃: 'Gansu', 山西: 'Shanxi', 内蒙古: 'Inner Mongolia', 陕西: 'Shaanxi', 吉林: 'Jilin', 福建: 'Fujian',
  贵州: 'Guizhou', 广东: 'Guangdong', 青海: 'Qinghai', 西藏: 'Tibet', 四川: 'Sichuan', 宁夏: 'Ningxia',
  海南: 'Hainan', 香港: 'Hong Kong', 澳门: 'Macao', 台湾: 'Taiwan'
};

let map = null;
let markerList = [];
let infoWindowList = [];
let is3DPitch = true;
let currentMode = 'vehicle';
let currentTheme = 'theme-white';
let currentLang = 'zh';
let currentRankType = 'fleet';
let dashboard = null;
let refreshTimer = null;
let provinceAreaNodePromise = null;
let provinceAggregationVersion = 0;
let vehicleProvinceSummary = { nodes: [], unassigned: 0, loading: true };

document.addEventListener('DOMContentLoaded', () => {
  initClock();
  initAMapInstance();
  loadDashboard();
  refreshTimer = window.setInterval(loadDashboard, 15000);
});

async function loadDashboard() {
  setDataState('loading');
  try {
    const response = await fetch('/api/dashboard', { headers: { Accept: 'application/json' } });
    const payload = await response.json();
    if (!response.ok || payload.status !== 'ok') throw new Error(payload.message || `HTTP ${response.status}`);
    dashboard = payload;
    updateDashboardUI();
    refreshVehicleProvinceNodes(payload);
    setDataState('ready');
  } catch (error) {
    console.error('dashboard refresh failed', error);
    setDataState('error');
  }
}

function setDataState(state) {
  const el = document.getElementById('mapStatusText');
  if (!el) return;
  if (state === 'loading' && !dashboard) el.textContent = currentLang === 'zh' ? '正在同步开放平台数据…' : 'Syncing open-platform data…';
  if (state === 'error') el.textContent = currentLang === 'zh' ? '数据同步失败 · 将自动重试' : 'Data sync failed · Retrying';
}

function initAMapInstance() {
  if (typeof AMap === 'undefined') {
    setDataState('error');
    return;
  }
  map = new AMap.Map('amapContainer', {
    zoom: 4.8, center: [108.948024, 34.263161], viewMode: '3D', pitch: 30,
    mapStyle: getAMapThemeStyle(currentTheme), showBuildingBlock: false, showLabel: true
  });
  map.on('complete', renderAMapMarkers);
  map.on('zoomend', renderAMapMarkers);
}

function updateDashboardUI() {
  if (!dashboard) return;
  const dict = i18n[currentLang];
  const summary = dashboard.summary;
  const total = currentMode === 'vehicle' ? summary.totalVehicles : summary.totalStations;
  const active = currentMode === 'vehicle' ? summary.onlineVehicles : summary.cooperativeStations;
  const unit = currentMode === 'vehicle' ? dict.unitVehicles : dict.unitStations;
  const activeRate = total ? (active * 100 / total).toFixed(1) : '0.0';
  document.getElementById('dashboardTitle').textContent = currentMode === 'vehicle' ? dict.vehicleModeTitle : dict.stationModeTitle;
  document.getElementById('kpiFleetTotal').innerHTML = `${formatNumber(total)} <small>${unit}</small>`;
  document.getElementById('kpiFleetOnline').innerHTML = `${formatNumber(active)} <small>${unit} (${activeRate}%)</small>`;
  document.getElementById('kpiDailyDist').innerHTML = `${formatNumber(summary.todayMileageKm, 1)} <small>km</small>`;
  const provinceSummary = buildVehicleProvinceNodes();
  const provinceText = provinceSummary.loading
    ? (currentLang === 'zh' ? '省级归属计算中' : 'province grouping in progress')
    : (currentLang === 'zh' ? `${provinceSummary.nodes.length}个省级行政区` : `${provinceSummary.nodes.length} province-level regions`);
  document.getElementById('mapStatusText').textContent = currentLang === 'zh'
    ? `开放平台已同步 · ${summary.totalVehicles}辆授权车辆 · ${provinceText}${provinceSummary.unassigned ? ` · ${provinceSummary.unassigned}辆无实时位置` : ''} · ${summary.totalStations}座加氢站 · ${dashboard.asOf}`
    : `Open platform synced · ${summary.totalVehicles} vehicles · ${provinceText}${provinceSummary.unassigned ? ` · ${provinceSummary.unassigned} without realtime location` : ''} · ${summary.totalStations} stations · ${dashboard.asOf}`;
  updateStatusPanel();
  renderRankingList(currentRankType);
  renderAMapMarkers();
}

function updateStatusPanel() {
  const dict = i18n[currentLang];
  const summary = dashboard.summary;
  const title = document.getElementById('panelStatusTitle');
  const labels = [document.getElementById('statusLabel1'), document.getElementById('statusLabel2'), document.getElementById('statusLabel3')];
  const values = [document.getElementById('statusValue1'), document.getElementById('statusValue2'), document.getElementById('statusValue3')];
  let counts;
  if (currentMode === 'vehicle') {
    title.textContent = dict.panelStatusVehicle;
    counts = [summary.drivingVehicles, summary.idleVehicles, summary.offlineVehicles];
    labels[0].textContent = dict.statusRunning; labels[1].textContent = dict.statusStopped; labels[2].textContent = dict.statusOffline;
  } else {
    title.textContent = dict.panelStatusStation;
    counts = [summary.cooperativeStations, summary.totalStations - summary.cooperativeStations, summary.totalStations];
    labels[0].textContent = dict.stationCooperative; labels[1].textContent = dict.stationExternal; labels[2].textContent = dict.stationTotal;
  }
  const denominator = currentMode === 'vehicle' ? summary.totalVehicles : summary.totalStations;
  values.forEach((element, index) => {
    const pct = denominator ? counts[index] * 100 / denominator : 0;
    element.innerHTML = `${formatNumber(counts[index])} <small>${currentMode === 'vehicle' ? dict.unitVehicles : dict.unitStations}</small>`;
    const pctElement = document.getElementById(`statusPct${index + 1}`);
    if (pctElement) pctElement.textContent = `(${pct.toFixed(1)}%)`;
  });
  const segments = document.querySelectorAll('.liquid-progress-bar .seg');
  if (segments.length === 3) {
    const segmentCounts = currentMode === 'vehicle' ? counts : [counts[0], counts[1], 0];
    segments.forEach((segment, index) => segment.style.width = `${denominator ? segmentCounts[index] * 100 / denominator : 0}%`);
  }
  document.getElementById('panelRankTitle').textContent = currentMode === 'vehicle' ? dict.panelRankVehicle : dict.panelRankStation;
}

function buildVehicleClusters() {
  const clusters = new Map();
  for (const vehicle of dashboard?.vehicles || []) {
    if (!vehicle.locationAvailable || vehicle.longitude == null || vehicle.latitude == null) continue;
    const key = `${Math.round(vehicle.longitude * 2) / 2},${Math.round(vehicle.latitude * 2) / 2}`;
    if (!clusters.has(key)) clusters.set(key, { kind: 'vehicleCluster', lng: 0, lat: 0, count: 0, online: 0, dist: 0, vehicles: [] });
    const cluster = clusters.get(key);
    cluster.lng += Number(vehicle.longitude); cluster.lat += Number(vehicle.latitude); cluster.count += 1;
    cluster.online += vehicle.online ? 1 : 0; cluster.dist += Number(vehicle.dailyMileageKm || 0); cluster.vehicles.push(vehicle);
  }
  return [...clusters.values()].map((cluster, index) => ({
    ...cluster, id: `vehicle-${index}`, lnglat: [cluster.lng / cluster.count, cluster.lat / cluster.count],
    name: currentLang === 'zh' ? '车辆集群' : 'Vehicle cluster', detail: cluster.vehicles.slice(0, 5).map(v => v.plateNumber || v.vin).join('、')
  }));
}

function compactProvinceName(name) {
  return String(name || '')
    .replace(/(壮族|回族|维吾尔)?自治区$/, '')
    .replace(/特别行政区$/, '')
    .replace(/[省市]$/, '');
}

function loadAMapUIScript() {
  const src = 'https://webapi.amap.com/ui/1.1/main.js?v=1.1.1';
  if (window.AMapUI) return Promise.resolve();
  return new Promise((resolve, reject) => {
    const existing = document.querySelector?.(`script[src="${src}"]`);
    if (existing) {
      existing.addEventListener('load', resolve, { once: true });
      existing.addEventListener('error', () => reject(new Error('高德行政区组件加载失败')), { once: true });
      return;
    }
    const script = document.createElement('script');
    script.src = src; script.async = true; script.onload = resolve;
    script.onerror = () => reject(new Error('高德行政区组件加载失败'));
    document.head.appendChild(script);
  });
}

function chinaProvinceAreaNode() {
  if (provinceAreaNodePromise) return provinceAreaNodePromise;
  provinceAreaNodePromise = loadAMapUIScript().then(() => new Promise((resolve, reject) => {
    window.AMapUI.loadUI(['geo/DistrictExplorer'], (DistrictExplorer) => {
      const explorer = new DistrictExplorer({ eventSupport: false });
      explorer.loadAreaNode(100000, (error, areaNode) => {
        if (error || !areaNode) reject(error || new Error('全国省级边界不可用'));
        else resolve(areaNode);
      });
    });
  })).catch(error => {
    provinceAreaNodePromise = null;
    throw error;
  });
  return provinceAreaNodePromise;
}

const GCJ_A = 6378245;
const GCJ_EE = 0.006693421622965943;
function outsideGcjChina(longitude, latitude) { return longitude < 72.004 || longitude > 137.8347 || latitude < 0.8293 || latitude > 55.8271; }
function transformLatitude(longitude, latitude) {
  let value = -100 + 2 * longitude + 3 * latitude + 0.2 * latitude * latitude + 0.1 * longitude * latitude + 0.2 * Math.sqrt(Math.abs(longitude));
  value += (20 * Math.sin(6 * longitude * Math.PI) + 20 * Math.sin(2 * longitude * Math.PI)) * 2 / 3;
  value += (20 * Math.sin(latitude * Math.PI) + 40 * Math.sin(latitude / 3 * Math.PI)) * 2 / 3;
  value += (160 * Math.sin(latitude / 12 * Math.PI) + 320 * Math.sin(latitude * Math.PI / 30)) * 2 / 3;
  return value;
}
function transformLongitude(longitude, latitude) {
  let value = 300 + longitude + 2 * latitude + 0.1 * longitude * longitude + 0.1 * longitude * latitude + 0.1 * Math.sqrt(Math.abs(longitude));
  value += (20 * Math.sin(6 * longitude * Math.PI) + 20 * Math.sin(2 * longitude * Math.PI)) * 2 / 3;
  value += (20 * Math.sin(longitude * Math.PI) + 40 * Math.sin(longitude / 3 * Math.PI)) * 2 / 3;
  value += (150 * Math.sin(longitude / 12 * Math.PI) + 300 * Math.sin(longitude / 30 * Math.PI)) * 2 / 3;
  return value;
}
function wgs84ToGcj02(longitude, latitude) {
  if (!Number.isFinite(longitude) || !Number.isFinite(latitude) || outsideGcjChina(longitude, latitude)) return [longitude, latitude];
  const latitudeOffset = transformLatitude(longitude - 105, latitude - 35);
  const longitudeOffset = transformLongitude(longitude - 105, latitude - 35);
  const radianLatitude = latitude / 180 * Math.PI;
  const magic = 1 - GCJ_EE * Math.sin(radianLatitude) ** 2;
  const sqrtMagic = Math.sqrt(magic);
  return [
    longitude + longitudeOffset * 180 / (GCJ_A / sqrtMagic * Math.cos(radianLatitude) * Math.PI),
    latitude + latitudeOffset * 180 / ((GCJ_A * (1 - GCJ_EE)) / (magic * sqrtMagic) * Math.PI)
  ];
}

function aggregateVehicleProvinces(areaNode, vehicles = dashboard?.vehicles || []) {
  const located = vehicles.filter(vehicle => vehicle.locationAvailable && Number.isFinite(Number(vehicle.longitude)) && Number.isFinite(Number(vehicle.latitude)));
  let unassigned = vehicles.length - located.length;
  const nodes = [];
  const groups = areaNode.groupByPosition(located, vehicle => wgs84ToGcj02(Number(vehicle.longitude), Number(vehicle.latitude)));
  for (const group of groups) {
    if (!group.points?.length) continue;
    const feature = group.subFeature;
    if (group.subFeatureIndex < 0 || !feature) { unassigned += group.points.length; continue; }
    const nameZh = compactProvinceName(feature.properties.name);
    const positions = group.points.map(vehicle => wgs84ToGcj02(Number(vehicle.longitude), Number(vehicle.latitude)));
    const center = feature.properties.center || [
      positions.reduce((sum, point) => sum + point[0], 0) / positions.length,
      positions.reduce((sum, point) => sum + point[1], 0) / positions.length
    ];
    nodes.push({
      id: `vehicle-province-${feature.properties.adcode}`, kind: 'vehicleProvince', nameZh,
      nameEn: PROVINCE_ENGLISH[nameZh] || nameZh, name: currentLang === 'zh' ? nameZh : (PROVINCE_ENGLISH[nameZh] || nameZh),
      lnglat: center, count: group.points.length, online: group.points.filter(vehicle => vehicle.online).length,
      dist: group.points.reduce((sum, vehicle) => sum + Number(vehicle.dailyMileageKm || 0), 0), vehicles: group.points,
      detail: group.points.slice(0, 5).map(vehicle => vehicle.plateNumber || vehicle.vin).join('、')
    });
  }
  return { nodes, unassigned, loading: false };
}

async function refreshVehicleProvinceNodes(sourceDashboard = dashboard) {
  const version = ++provinceAggregationVersion;
  try {
    const areaNode = await chinaProvinceAreaNode();
    if (version !== provinceAggregationVersion || sourceDashboard !== dashboard) return;
    vehicleProvinceSummary = aggregateVehicleProvinces(areaNode, sourceDashboard?.vehicles || []);
    updateDashboardUI();
  } catch (error) {
    console.error('province aggregation failed', error);
    if (version !== provinceAggregationVersion) return;
    vehicleProvinceSummary = { nodes: [], unassigned: sourceDashboard?.vehicles?.length || 0, loading: false };
    updateDashboardUI();
  }
}

function buildVehicleProvinceNodes() {
  return {
    ...vehicleProvinceSummary,
    nodes: vehicleProvinceSummary.nodes.map(node => ({ ...node, name: currentLang === 'zh' ? node.nameZh : node.nameEn }))
  };
}

function vehicleNodes() {
  if ((map?.getZoom?.() || 0) < 7) return buildVehicleProvinceNodes().nodes;
  return buildVehicleClusters();
}

function stationNodes() {
  const stations = dashboard?.stations || [];
  if ((map?.getZoom?.() || 0) >= 7) {
    return stations.map(station => ({
      id: `station-${station.id}`, kind: 'station', name: station.name, lnglat: [station.longitude, station.latitude],
      count: 1, online: station.cooperative ? 1 : 0,
      detail: [station.province, station.city, station.district, station.address].filter(Boolean).join(' '), cooperative: station.cooperative
    }));
  }
  const grouped = new Map();
  for (const station of stations) {
    const province = station.province || (currentLang === 'zh' ? '未标注区域' : 'Unspecified');
    if (!grouped.has(province)) grouped.set(province, { kind: 'stationCluster', name: province, lng: 0, lat: 0, count: 0, online: 0, stations: [] });
    const group = grouped.get(province);
    group.lng += Number(station.longitude); group.lat += Number(station.latitude); group.count += 1;
    group.online += station.cooperative ? 1 : 0; group.stations.push(station);
  }
  return [...grouped.values()].map((group, index) => ({
    ...group, id: `station-cluster-${index}`, lnglat: [group.lng / group.count, group.lat / group.count],
    detail: group.stations.slice(0, 5).map(station => station.name).join('、')
  }));
}

function renderAMapMarkers() {
  if (!map || !dashboard) return;
  markerList.forEach(marker => marker.remove()); markerList = [];
  infoWindowList.forEach(infoWindow => infoWindow.close()); infoWindowList = [];
  const nodes = currentMode === 'vehicle' ? vehicleNodes() : stationNodes();
  const dict = i18n[currentLang];
  for (const node of nodes) {
    const isVehicleNode = node.kind === 'vehicleProvince' || node.kind === 'vehicleCluster';
    const markerContent = document.createElement('div');
    markerContent.className = 'province-info-badge-wrap';
    const label = node.kind === 'station' ? (node.cooperative ? 'H₂ · 合作' : 'H₂') : node.kind === 'stationCluster' ? `${node.count} 站` : node.kind === 'vehicleProvince' ? `${node.count} ${dict.unitVehicles}` : `${node.count}`;
    markerContent.innerHTML = `<div class="province-info-card"><div class="p-head"><span class="p-dot"></span><span class="p-name">${escapeHTML(node.name)}</span><span class="p-total">${escapeHTML(label)}</span></div>${isVehicleNode ? `<div class="p-sub">${dict.onlineText} ${node.online}</div>` : ''}</div>`;
    const marker = new AMap.Marker({ position: node.lnglat, content: markerContent, offset: new AMap.Pixel(-30, -12), title: node.name });
    const infoWindow = new AMap.InfoWindow({
      isCustom: true,
      content: `<div class="map-info-window"><strong>${escapeHTML(node.name)}</strong><div>${escapeHTML(node.detail || '')}</div>${isVehicleNode ? `<div>${dict.onlineText}: ${node.online}/${node.count} · ${formatNumber(node.dist, 1)} km</div>` : ''}</div>`,
      offset: new AMap.Pixel(0, -32)
    });
    infoWindowList.push(infoWindow);
    marker.on('mouseover', () => infoWindow.open(map, node.lnglat));
    marker.on('mouseout', () => infoWindow.close());
    if (node.kind === 'vehicleProvince') marker.on('click', () => map.setZoomAndCenter(7.2, node.lnglat));
    if (node.kind === 'stationCluster') marker.on('click', () => map.setZoomAndCenter(7.2, node.lnglat));
    marker.setMap(map); markerList.push(marker);
  }
}

function renderRankingList(type) {
  const box = document.getElementById('rankingListBox');
  if (!box || !dashboard) return;
  box.innerHTML = '';
  let rows;
  if (currentMode === 'vehicle') {
    rows = buildVehicleProvinceNodes().nodes
      .sort((a, b) => type === 'dist' ? b.dist - a.dist : b.count - a.count)
      .slice(0, 12)
      .map(item => ({ name: item.name, value: type === 'dist' ? `${formatNumber(item.dist, 1)} km` : `${formatNumber(item.count)} ${i18n[currentLang].unitVehicles}`, location: item.lnglat }));
  } else {
    const provinces = new Map();
    for (const station of dashboard.stations) {
      const name = station.province || (currentLang === 'zh' ? '未标注' : 'Unspecified');
      provinces.set(name, (provinces.get(name) || 0) + 1);
    }
    rows = [...provinces.entries()].sort((a, b) => b[1] - a[1]).slice(0, 12).map(([name, value]) => ({ name, value: `${value} ${i18n[currentLang].unitStations}` }));
  }
  rows.forEach((item, index) => {
    const row = document.createElement('div'); row.className = 'rank-glass-row';
    row.innerHTML = `<span class="r-badge ${index < 3 ? `r-top${index + 1}` : ''}">${index + 1}</span><span class="r-name">${escapeHTML(item.name)}</span><span class="r-val">${escapeHTML(item.value)}</span>`;
    if (item.location) row.onclick = () => map?.setZoomAndCenter(9, item.location);
    box.appendChild(row);
  });
}

function switchRankTab(type) {
  currentRankType = type;
  document.querySelectorAll('.gtab').forEach(button => button.classList.remove('active'));
  if (window.event?.target) window.event.target.classList.add('active');
  renderRankingList(type);
}

function switchMode(mode) {
  currentMode = mode;
  document.getElementById('btnModeVehicle').classList.toggle('active', mode === 'vehicle');
  document.getElementById('btnModeStation').classList.toggle('active', mode === 'station');
  updateDashboardUI();
}

function setLanguage(lang) {
  currentLang = lang;
  document.querySelectorAll('.lang-switcher-bw .segment-btn').forEach(button => button.classList.remove('active'));
  document.querySelector(`.lang-${lang}-btn`)?.classList.add('active');
  const dict = i18n[lang];
  document.querySelectorAll('[data-i18n]').forEach(element => {
    const key = element.getAttribute('data-i18n'); if (dict[key]) element.textContent = dict[key];
  });
  updateDashboardUI();
}

function setTheme(themeName) {
  currentTheme = themeName; document.body.className = themeName;
  document.querySelectorAll('.bw-btn').forEach(button => button.classList.remove('active'));
  document.querySelector(themeName === 'theme-dark' ? '.theme-dark-btn' : '.theme-white-btn')?.classList.add('active');
  if (map) { map.setMapStyle(getAMapThemeStyle(themeName)); renderAMapMarkers(); }
}

function getAMapThemeStyle(theme) { return theme === 'theme-white' ? 'amap://styles/light' : 'amap://styles/darkblue'; }
function resetMapView() { if (map) { map.setZoomAndCenter(4.8, [108.948024, 34.263161]); map.setPitch(30); } }
function clearProvinceFilter() { resetMapView(); }
function togglePitchView() { if (map) { is3DPitch = !is3DPitch; map.setPitch(is3DPitch ? 30 : 0); } }
function formatNumber(value, digits = 0) { return Number(value || 0).toLocaleString(currentLang === 'zh' ? 'zh-CN' : 'en-US', { maximumFractionDigits: digits, minimumFractionDigits: digits }); }
function escapeHTML(value) { return String(value ?? '').replace(/[&<>'"]/g, char => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', "'": '&#39;', '"': '&quot;' }[char])); }
function initClock() {
  const clock = document.getElementById('clockTime');
  const update = () => { if (clock) clock.textContent = new Date().toLocaleTimeString('zh-CN', { hour12: false }); };
  update(); window.setInterval(update, 1000);
}