/** 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: '车辆累计里程 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 Vehicles by Odometer', 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'
  }
};

let map = null;
let markerList = [];
let is3DPitch = true;
let currentMode = 'vehicle';
let currentTheme = 'theme-white';
let currentLang = 'zh';
let currentRankType = 'fleet';
let dashboard = null;
let refreshTimer = null;

document.addEventListener('DOMContentLoaded', () => {
  initClock();
  initAMapInstance();
  loadDashboard();
  refreshTimer = window.setInterval(loadDashboard, 30000);
});

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();
    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>`;
  document.getElementById('mapStatusText').textContent = currentLang === 'zh'
    ? `开放平台已同步 · ${summary.totalVehicles}辆授权车辆 · ${summary.totalStations}座加氢站 · ${dashboard.asOf}`
    : `Open platform synced · ${summary.totalVehicles} vehicles · ${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: 'vehicle', 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 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 = [];
  const nodes = currentMode === 'vehicle' ? buildVehicleClusters() : stationNodes();
  const dict = i18n[currentLang];
  for (const node of nodes) {
    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.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>${node.kind === 'vehicle' ? `<div class="p-sub">${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>${escapeHTML(node.detail || '')}</div>${node.kind === 'vehicle' ? `<div>${dict.onlineText}: ${node.online}/${node.count} · ${formatNumber(node.dist, 1)} km</div>` : ''}</div>`,
      offset: new AMap.Pixel(0, -32)
    });
    marker.on('mouseover', () => infoWindow.open(map, node.lnglat));
    marker.on('mouseout', () => infoWindow.close());
    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 = [...dashboard.vehicles]
      .filter(item => item.totalMileageKm != null)
      .sort((a, b) => type === 'dist' ? Number(b.dailyMileageKm || 0) - Number(a.dailyMileageKm || 0) : Number(b.totalMileageKm || 0) - Number(a.totalMileageKm || 0))
      .slice(0, 12)
      .map(item => ({ name: item.plateNumber || item.vin, value: type === 'dist' ? `${formatNumber(item.dailyMileageKm, 1)} km` : `${formatNumber(item.totalMileageKm, 1)} km`, location: item.locationAvailable ? [item.longitude, item.latitude] : null }));
  } 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);
}