// info-card.js - Unified info card module
import { showStatusMessage } from './ui.js';

let currentType = null;
let cardMounted = false;
let typewriterTimerId = null;
let typewriterToken = 0;
let pendingMobileDetailState = null;
let mobileDetailsListenerBound = false;
let renderedMobileDetailKey = null;

function getNewsSummaryText(data) {
  return (data?.summary || data?.title || '').trim() || '暂无摘要';
}

function getNewsSummaryPreview(data, maxLength = 34) {
  const text = getNewsSummaryText(data).replace(/\s+/g, ' ').trim();
  if (text.length <= maxLength) return text;
  return `${text.slice(0, Math.max(0, maxLength - 1))}…`;
}

function stopTypewriterAnimation() {
  typewriterToken += 1;
  if (typewriterTimerId) {
    window.clearTimeout(typewriterTimerId);
    typewriterTimerId = null;
  }
}

function startTypewriterAnimation(target, text, options = {}) {
  if (!(target instanceof HTMLElement)) return;
  stopTypewriterAnimation();

  const content = typeof text === 'string' ? text : '';
  const token = typewriterToken;
  const stepMs = Number.isFinite(options.stepMs) ? options.stepMs : 22;
  const startDelayMs = Number.isFinite(options.startDelayMs) ? options.startDelayMs : 90;

  target.textContent = '';
  target.classList.add('is-typing');

  let index = 0;
  const tick = () => {
    if (token !== typewriterToken) return;
    index += 1;
    target.textContent = content.slice(0, index);
    if (index < content.length) {
      typewriterTimerId = window.setTimeout(tick, stepMs);
      return;
    }
    target.classList.remove('is-typing');
    typewriterTimerId = null;
  };

  typewriterTimerId = window.setTimeout(() => {
    if (token !== typewriterToken) return;
    if (!content) {
      target.classList.remove('is-typing');
      typewriterTimerId = null;
      return;
    }
    tick();
  }, startDelayMs);
}

function renderNewsCardContent(content, data) {
  if (!(content instanceof HTMLElement)) return;
  const summary = getNewsSummaryText(data);
  content.innerHTML = `
    <div class="info-card-news-layout">
      <div class="info-card-news-kicker">NEWS SIGNAL</div>
      <div class="info-card-news-title">${data?.title || '新闻事件'}</div>
      <div class="info-card-news-summary-shell">
        <div class="info-card-news-summary-label">SUMMARY</div>
        <div class="info-card-news-summary" data-news-summary></div>
      </div>
    </div>
  `;
  const summaryEl = content.querySelector('[data-news-summary]');
  startTypewriterAnimation(summaryEl, summary);
}

function renderMobileNewsCardContent(content, data) {
  if (!(content instanceof HTMLElement)) return;
  const summary = getNewsSummaryText(data);
  content.innerHTML = `
    <div class="earth-mobile-news-detail">
      <div class="earth-mobile-news-detail-kicker">NEWS SIGNAL</div>
      <div class="earth-mobile-news-detail-title">${data?.title || '新闻事件'}</div>
      <div class="earth-mobile-news-detail-summary-shell">
        <div class="earth-mobile-news-detail-summary-label">SUMMARY</div>
        <div class="earth-mobile-news-detail-summary" data-news-summary></div>
      </div>
    </div>
  `;
  const summaryEl = content.querySelector('[data-news-summary]');
  startTypewriterAnimation(summaryEl, summary, { stepMs: 20, startDelayMs: 70 });
}

function renderMobileDetailContent(type, config, data) {
  const content = document.getElementById('mobile-info-card-content');
  if (!(content instanceof HTMLElement)) return;

  stopTypewriterAnimation();
  if (type === 'news') {
    renderMobileNewsCardContent(content, data);
    return;
  }

  let html = '';
  for (const field of config.fields) {
    let value = data[field.key];
    if (value === undefined || value === null || value === '') {
      value = '-';
    } else if (typeof value === 'number') {
      value = value.toLocaleString();
    }
    if (field.unit && value !== '-') value = value + ' ' + field.unit;
    html += `
      <div class="earth-mobile-detail-row">
        <span class="earth-mobile-detail-row-label">${field.label}</span>
        <span class="earth-mobile-detail-row-value">${value}</span>
      </div>
    `;
  }
  content.innerHTML = html;
}

function getMobileDetailRenderKey(type, data) {
  if (type !== 'news') return null;
  return [
    type,
    data?.id ?? '',
    data?.url ?? '',
    data?.published_at ?? '',
    data?.title ?? '',
  ].join('|');
}

function isMobileDetailsDrawerActive() {
  const detailsSlot = document.querySelector('[data-drawer-slot="details"]');
  return detailsSlot instanceof HTMLElement && detailsSlot.classList.contains('is-active');
}

function ensureMobileDetailsListener() {
  if (mobileDetailsListenerBound) return;
  mobileDetailsListenerBound = true;

  window.addEventListener('earth:open-details-tab', () => {
    if (!document.body.classList.contains('layout-mode-mobile')) return;
    if (!pendingMobileDetailState) return;
    const nextKey = getMobileDetailRenderKey(
      pendingMobileDetailState.type,
      pendingMobileDetailState.data,
    );
    if (nextKey && nextKey === renderedMobileDetailKey) return;
    renderMobileDetailContent(
      pendingMobileDetailState.type,
      pendingMobileDetailState.config,
      pendingMobileDetailState.data,
    );
    renderedMobileDetailKey = nextKey;
  });
}

function renderDefaultCardContent(content, config, data) {
  let html = '';
  for (const field of config.fields) {
    let value = data[field.key];

    if (value === undefined || value === null || value === '') {
      value = '-';
    } else if (typeof value === 'number') {
      value = value.toLocaleString();
    }

    if (field.unit && value !== '-') {
      value = value + ' ' + field.unit;
    }

    html += `
      <div class="info-card-property">
        <span class="info-card-label">${field.label}</span>
        <span class="info-card-value">${value}</span>
      </div>
    `;
  }

  content.innerHTML = html;
}

// ── Mobile popup ─────────────────────────────────────────────

function getMobilePopupTitle(type, data) {
  switch (type) {
    case 'cable':         return data.name || '海缆';
    case 'landing_point': return data.name || '登陆点';
    case 'satellite':     return data.name || '卫星';
    case 'bgp':           return data.anomaly_type || 'BGP事件';
    case 'news':          return data.title || '新闻事件';
    case 'bgp_collector': return data.collector || 'BGP观测站';
    case 'supercomputer': return data.name || '超算';
    case 'gpu_cluster':   return data.name || 'GPU集群';
    case 'vessel':        return data.name || '船只';
    default:              return '详情';
  }
}

function getMobilePopupSubtitle(type, data) {
  switch (type) {
    case 'cable':         return data.owner || data.status || '海缆';
    case 'landing_point': return data.country || '登陆点';
    case 'satellite':     return data.norad_id ? `NORAD ${data.norad_id}` : '卫星';
    case 'bgp':           return data.severity || 'BGP路由异常';
    case 'news':          return getNewsSummaryPreview(data, 30) || '态势新闻';
    case 'bgp_collector': return data.location || 'BGP观测站';
    case 'supercomputer': return data.country || '超级计算机';
    case 'gpu_cluster':   return data.country || 'GPU集群';
    case 'vessel':        return data.vessel_type || 'AIS 船只';
    default:              return '';
  }
}

function positionMobilePopup(popup, touchX, touchY, options = {}) {
  const margin = 14;
  const drawerClearance = 52;
  const vpW = window.innerWidth;
  const vpH = window.innerHeight;
  const safeBottom = parseFloat(
    getComputedStyle(document.documentElement).getPropertyValue('--safe-bottom')
  ) || 0;
  const bottomBound = vpH - drawerClearance - safeBottom;

  // Measure actual popup size (it's rendered but invisible via opacity)
  const popW = popup.offsetWidth || 200;
  const popH = popup.offsetHeight || 68;

  if (options.absolute === true) {
    const left = Math.max(margin, Math.min(touchX, vpW - popW - margin));
    const top = Math.max(margin, Math.min(touchY, bottomBound - popH - margin));
    popup.style.left = `${left}px`;
    popup.style.top  = `${top}px`;
    return;
  }

  const gap = 22;
  const spaceRight  = vpW - touchX;
  const spaceLeft   = touchX;
  const spaceBottom = bottomBound - touchY;
  const spaceTop    = touchY;

  let left, top;

  // Horizontal: side with more room
  if (spaceRight >= popW + gap + margin) {
    left = touchX + gap;
  } else if (spaceLeft >= popW + gap + margin) {
    left = touchX - gap - popW;
  } else {
    left = Math.max(margin, Math.min(touchX - popW / 2, vpW - popW - margin));
  }

  // Vertical: prefer above touch, then below
  if (spaceTop >= popH + gap + margin) {
    top = touchY - gap - popH;
  } else if (spaceBottom >= popH + gap + margin) {
    top = touchY + gap;
  } else {
    top = Math.max(margin, Math.min(touchY - popH / 2, bottomBound - popH - margin));
  }

  left = Math.max(margin, Math.min(left, vpW - popW - margin));
  top  = Math.max(margin, Math.min(top, bottomBound - popH - margin));

  popup.style.left = `${left}px`;
  popup.style.top  = `${top}px`;
}

let popupShowToken = 0;

function showMobilePopup(type, data, x, y, options = {}) {
  // Require coordinates — skip if called without position (e.g. from handleCableClick)
  if (x == null || y == null) return;

  const popup  = document.getElementById('earth-mobile-popup');
  const iconEl = document.getElementById('earth-mobile-popup-icon');
  const titleEl = document.getElementById('earth-mobile-popup-title');
  const subEl  = document.getElementById('earth-mobile-popup-sub');
  if (!popup || !iconEl || !titleEl || !subEl) return;

  const config = CARD_CONFIG[type];
  if (!config) return;

  iconEl.textContent  = config.icon;
  titleEl.textContent = getMobilePopupTitle(type, data);
  subEl.textContent   = getMobilePopupSubtitle(type, data);

  // Invalidate any in-flight hide listener
  popupShowToken += 1;
  const token = popupShowToken;

  popup.dataset.dockSide = options.dockSide === 'right' ? 'right' : 'left';
  popup.classList.toggle('earth-mobile-popup--anchor-stable', options.anchorStable === true);
  popup.removeAttribute('hidden');
  popup.classList.remove('is-visible');

  requestAnimationFrame(() => {
    positionMobilePopup(popup, x, y, options);
    if (options.reveal === false) {
      return;
    }
    if (token !== popupShowToken) return; // superseded
    void popup.getBoundingClientRect();
    popup.classList.add('is-visible');
  });
}

function hideMobilePopup() {
  const popup = document.getElementById('earth-mobile-popup');
  if (!popup) return;
  popupShowToken += 1; // invalidate any pending show
  popup.classList.remove('is-visible');
  popup.classList.remove('earth-mobile-popup--anchor-stable');
  delete popup.dataset.dockSide;
  popup.addEventListener('transitionend', () => {
    if (!popup.classList.contains('is-visible')) {
      popup.setAttribute('hidden', '');
    }
  }, { once: true });
}

let popupClickBound = false;
function ensurePopupClickHandler() {
  if (popupClickBound) return;
  popupClickBound = true;
  const popup = document.getElementById('earth-mobile-popup');
  if (!popup) return;

  let dragPointerId = null;
  let startX = 0, startY = 0;
  let startLeft = 0, startTop = 0;
  let dragged = false;
  const DRAG_THRESHOLD = 10;

  const emitDragEvent = (dragging) => {
    const rect = popup.getBoundingClientRect();
    window.dispatchEvent(new CustomEvent('earth:info-card-drag', {
      detail: {
        left: rect.left,
        top: rect.top,
        width: rect.width,
        height: rect.height,
        dragging,
      },
    }));
  };

  popup.addEventListener('pointerdown', (e) => {
    if (e.button > 0) return;
    e.stopPropagation();
    dragPointerId = e.pointerId;
    startX = e.clientX;
    startY = e.clientY;
    const rect = popup.getBoundingClientRect();
    startLeft = rect.left;
    startTop  = rect.top;
    dragged = false;
  });

  // Track drag at document level so pointer can leave popup bounds
  document.addEventListener('pointermove', (e) => {
    if (e.pointerId !== dragPointerId) return;
    const dx = e.clientX - startX;
    const dy = e.clientY - startY;
    if (Math.hypot(dx, dy) < DRAG_THRESHOLD) return;
    dragged = true;
    e.stopPropagation();
    const margin = 8;
    const left = Math.max(margin, Math.min(startLeft + dx, window.innerWidth  - popup.offsetWidth  - margin));
    const top  = Math.max(margin, Math.min(startTop  + dy, window.innerHeight - popup.offsetHeight - margin));
    popup.style.left = `${left}px`;
    popup.style.top  = `${top}px`;
    emitDragEvent(true);
  });

  document.addEventListener('pointerup', (e) => {
    if (e.pointerId !== dragPointerId) return;
    const wasDragged = dragged;
    dragPointerId = null;
    dragged = false;
    emitDragEvent(false);
    if (!wasDragged) {
      window.dispatchEvent(new CustomEvent('earth:open-details-tab'));
    }
  });

  document.addEventListener('pointercancel', (e) => {
    if (e.pointerId === dragPointerId) {
      dragPointerId = null;
      dragged = false;
      emitDragEvent(false);
    }
  });

  // Block click from bubbling to document (which would close the drawer)
  popup.addEventListener('click', (e) => e.stopPropagation());
}

const CARD_CONFIG = {
  cable: {
    icon: '🛥️',
    title: '电缆详情',
    className: 'cable',
    fields: [
      { key: 'name', label: '名称' },
      { key: 'owner', label: '所有者' },
      { key: 'status', label: '状态' },
      { key: 'length', label: '长度' },
      { key: 'coords', label: '经纬度' },
      { key: 'rfs', label: '投入使用' }
    ]
  },
  landing_point: {
    icon: '📍',
    title: '登陆点详情',
    className: 'cable',
    fields: [
      { key: 'name', label: '名称' },
      { key: 'country', label: '国家' },
      { key: 'status', label: '状态' },
      { key: 'cable_count', label: '关联海缆数' },
      { key: 'cables', label: '关联海缆' }
    ]
  },
  satellite: {
    icon: '🛰️',
    title: '卫星详情',
    className: 'satellite',
    fields: [
      { key: 'name', label: '名称' },
      { key: 'norad_id', label: 'NORAD ID' },
      { key: 'constellation', label: '星座/分组' },
      { key: 'footprint_capability', label: '覆盖能力' },
      { key: 'current_display', label: '当前显示' },
      { key: 'footprint_model', label: '覆盖模型' },
      { key: 'inclination', label: '倾角', unit: '°' },
      { key: 'period', label: '周期', unit: '分钟' },
      { key: 'perigee', label: '近地点', unit: 'km' },
      { key: 'apogee', label: '远地点', unit: 'km' }
    ]
  },
  bgp: {
    icon: '📡',
    title: 'BGP事件详情',
    className: 'bgp',
    fields: [
      { key: 'anomaly_type', label: '事件类型' },
      { key: 'severity', label: '严重度' },
      { key: 'status', label: '状态' },
      { key: 'route_change', label: '事件特征' },
      { key: 'prefix', label: '前缀' },
      { key: 'as_path_display', label: '传播路径' },
      { key: 'origin_asn', label: '涉及 ASN' },
      { key: 'new_origin_asn', label: '关联 ASN' },
      { key: 'confidence', label: '置信度' },
      { key: 'collector', label: '主观测站' },
      { key: 'observed_by', label: '观测范围' },
      { key: 'impacted_scope', label: '影响区域' },
      { key: 'related_cables', label: '附近基础设施' },
      { key: 'related_satellites', label: '附近卫星' },
      { key: 'location', label: '观测位置' },
      { key: 'created_at', label: '事件时间' },
      { key: 'summary', label: '摘要' }
    ]
  },
  news: {
    icon: '📰',
    title: '新闻事件详情',
    className: 'news',
    fields: [
      { key: 'source', label: '来源' },
      { key: 'published_at_display', label: '发布时间' },
      { key: 'location_label', label: '发生地' },
      { key: 'region_label', label: '区域' },
      { key: 'feed_name', label: '聚合源' },
      { key: 'summary', label: '摘要' },
      { key: 'url', label: '原文链接' }
    ]
  },
  bgp_collector: {
    icon: '📍',
    title: 'BGP观测站详情',
    className: 'bgp',
    fields: [
      { key: 'collector', label: '采集器' },
      { key: 'location', label: '观测位置' },
      { key: 'anomaly_count', label: '当前事件数' },
      { key: 'observation_count', label: '观测事件数' },
      { key: 'recent_24h_observation_count', label: '近24h事件数' },
      { key: 'recent_7d_observation_count', label: '近7d事件数' },
      { key: 'prefix_count', label: '观测前缀数' },
      { key: 'origin_asn_count', label: '观测 ASN 数' },
      { key: 'top_event_types', label: '主要事件类型' },
      { key: 'coverage_halo', label: '日常活跃度' },
      { key: 'related_satellites', label: '附近卫星' },
      { key: 'latest_event_type', label: '最近事件类型' },
      { key: 'latest_observed_at', label: '最近活跃时间' },
      { key: 'baseline_scope', label: '日常覆盖范围' },
      { key: 'status', label: '状态' }
    ]
  },
  supercomputer: {
    icon: '🖥️',
    title: '超算中心详情',
    className: 'supercomputer',
    fields: [
      { key: 'name', label: '名称' },
      { key: 'site_type_label', label: '类型' },
      { key: 'rank', label: '排名' },
      { key: 'capacity', label: '实测算力' },
      { key: 'vendor', label: '厂商' },
      { key: 'operator', label: '运营方' },
      { key: 'cores', label: '核心数' },
      { key: 'power', label: '功耗', unit: 'kW' },
      { key: 'country', label: '国家' },
      { key: 'city', label: '城市' },
      { key: 'location_precision_label', label: '位置精度' },
      { key: 'source', label: '来源' },
      { key: 'updated_at', label: '更新时间' }
    ]
  },
  gpu_cluster: {
    icon: '🎮',
    title: 'GPU集群详情',
    className: 'gpu_cluster',
    fields: [
      { key: 'name', label: '名称' },
      { key: 'site_type_label', label: '类型' },
      { key: 'capacity', label: '估算算力' },
      { key: 'gpu_count', label: 'GPU 数量' },
      { key: 'gpu_type', label: 'GPU 型号' },
      { key: 'vendor', label: '芯片/平台' },
      { key: 'operator', label: '运营方' },
      { key: 'country', label: '国家' },
      { key: 'city', label: '城市' },
      { key: 'location_precision_label', label: '位置精度' },
      { key: 'source', label: '来源' },
      { key: 'updated_at', label: '更新时间' }
    ]
  },
  vessel: {
    icon: '🚢',
    title: '船只详情',
    className: 'vessel',
    fields: [
      { key: 'name', label: '名称' },
      { key: 'mmsi', label: 'MMSI' },
      { key: 'imo', label: 'IMO' },
      { key: 'flag', label: '旗帜' },
      { key: 'vessel_type', label: '船型' },
      { key: 'speed', label: '当前航速', unit: 'kn' },
      { key: 'course', label: '航向', unit: '°' },
      { key: 'status', label: '状态' },
      { key: 'length', label: '船长', unit: 'm' },
      { key: 'received_at', label: '更新时间' }
    ]
  }
};

function getPanel() {
  return document.getElementById('info-panel');
}

function setupInfoCardDrag(panel) {
  const app = document.getElementById('container');
  if (!app) return;

  const handle = panel.querySelector('.hud-panel-drag-handle');
  if (!handle) return;

  let isDragging = false;
  let activePointerId = null;
  let startPointerX = 0;
  let startPointerY = 0;
  let startLeft = 0;
  let startTop = 0;

  const emitDragEvent = () => {
    const rect = panel.getBoundingClientRect();
    window.dispatchEvent(
      new CustomEvent('earth:info-card-drag', {
        detail: {
          left: rect.left,
          top: rect.top,
          width: rect.width,
          height: rect.height,
          dragging: isDragging,
        },
      })
    );
  };

  const stopDragging = (event) => {
    if (
      event &&
      activePointerId !== null &&
      "pointerId" in event &&
      event.pointerId !== activePointerId
    ) {
      return;
    }
    isDragging = false;
    activePointerId = null;
    panel.classList.remove('is-dragging');
    document.body.style.userSelect = '';
    emitDragEvent();
  };

  const onMove = (event) => {
    if (!isDragging) return;
    if (activePointerId !== null && event.pointerId !== activePointerId) return;
    event.preventDefault();
    const appRect = app.getBoundingClientRect();
    const panelRect = panel.getBoundingClientRect();
    const nextLeft = Math.min(
      Math.max(startLeft + (event.clientX - startPointerX), 0),
      appRect.width - panelRect.width,
    );
    const nextTop = Math.min(
      Math.max(startTop + (event.clientY - startPointerY), 0),
      appRect.height - panelRect.height,
    );
    panel.style.left = `${nextLeft}px`;
    panel.style.top = `${nextTop}px`;
    emitDragEvent();
  };

  handle.addEventListener('pointerdown', (event) => {
    if (event.target.closest('.hud-panel-close, .info-card-close')) return;
    event.preventDefault();
    isDragging = true;
    activePointerId = event.pointerId;
    startPointerX = event.clientX;
    startPointerY = event.clientY;
    const appRect = app.getBoundingClientRect();
    const panelRect = panel.getBoundingClientRect();
    startLeft = panelRect.left - appRect.left;
    startTop = panelRect.top - appRect.top;
    panel.style.left = `${startLeft}px`;
    panel.style.top = `${startTop}px`;
    panel.style.right = 'auto';
    panel.style.bottom = 'auto';
    panel.classList.add('is-dragging');
    document.body.style.userSelect = 'none';
    handle.setPointerCapture?.(event.pointerId);
    emitDragEvent();
  });

  // Listen in capture phase so card-level stopPropagation used to shield the
  // globe canvas does not swallow the drag stream before we can reposition.
  window.addEventListener('pointermove', onMove, { passive: false, capture: true });
  window.addEventListener('pointerup', stopDragging, { capture: true });
  window.addEventListener('pointercancel', stopDragging, { capture: true });
  handle.addEventListener('lostpointercapture', stopDragging);
}

function mountCard() {
  if (cardMounted) return;

  const container = document.getElementById('container');
  if (!container) return;

  const panel = document.createElement('div');
  panel.id = 'info-panel';
  panel.className = 'hud-panel hud-panel-info';
  panel.setAttribute('aria-live', 'polite');
  panel.setAttribute('aria-hidden', 'true');
  panel.setAttribute('hidden', '');
  panel.innerHTML = `
    <div id="info-card" class="info-card">
      <div class="info-card-header hud-panel-drag-handle">
        <span class="info-card-icon" id="info-card-icon">🛰️</span>
        <h3 id="info-card-title">详情</h3>
        <button class="info-card-close hud-panel-close" type="button" aria-label="关闭详情">
          <span class="material-symbols-rounded">close</span>
        </button>
      </div>
      <div id="info-card-content" class="info-card-content"></div>
    </div>
  `;

  container.appendChild(panel);

  const card = panel.querySelector('#info-card');
  const content = panel.querySelector('#info-card-content');

  // Prevent pointer events from reaching the earth canvas
  const stopEvent = (event) => { event.stopPropagation(); };
  [
    'mousemove', 'mousedown', 'mouseup', 'click', 'dblclick', 'wheel',
    'pointerdown', 'pointerup', 'pointermove',
    'touchstart', 'touchmove', 'touchend',
  ].forEach((evt) => card.addEventListener(evt, stopEvent, { passive: false }));

  // Close button
  const closeBtn = card.querySelector('.info-card-close');
  if (closeBtn) {
    closeBtn.addEventListener('click', (event) => {
      event.stopPropagation();
      hideInfoCard();
    });
  }

  // Copy value on label click
  content.addEventListener('click', async (event) => {
    const label = event.target.closest('.info-card-label');
    if (!label) return;

    const property = label.closest('.info-card-property');
    const valueEl = property?.querySelector('.info-card-value');
    const value = valueEl?.textContent?.trim();

    if (!value || value === '-') {
      showStatusMessage('无可复制内容', 'warning');
      return;
    }

    try {
      await navigator.clipboard.writeText(value);
      showStatusMessage(`已复制${label.textContent}：${value}`, 'success');
    } catch (error) {
      console.error('Copy failed:', error);
      showStatusMessage('复制失败', 'error');
    }
  });

  setupInfoCardDrag(panel);

  cardMounted = true;
}

function positionPanel(panel, x, y, options = {}) {
  if (!panel) return;
  if (document.body.classList.contains('layout-mode-mobile')) {
    panel.style.left = '8px';
    panel.style.right = '8px';
    panel.style.top = 'auto';
    panel.style.bottom = 'calc(84px + env(safe-area-inset-bottom, 0px))';
    return;
  }
  const margin = 12;
  const offset = 14;
  const vpW = window.innerWidth;
  const vpH = window.innerHeight;

  const scale = parseFloat(
    getComputedStyle(document.documentElement).getPropertyValue('--hud-scale')
  ) || 1;
  const estW = Math.min(300 * scale, vpW - 32);
  const estH = Math.min(420 * scale, vpH * 0.7);

  if (options.absolute === true) {
    const clampedLeft = Math.min(
      Math.max(margin, x),
      Math.max(margin, vpW - estW - margin),
    );
    const clampedTop = Math.min(
      Math.max(margin, y),
      Math.max(margin, vpH - estH - margin),
    );
    panel.style.left = `${clampedLeft}px`;
    panel.style.top = `${clampedTop}px`;
    panel.style.right = 'auto';
    panel.style.bottom = 'auto';
    return;
  }

  let left = x + offset;
  let top = y + offset;

  if (left + estW > vpW - margin) left = x - estW - offset;
  if (top + estH > vpH - margin) top = Math.max(margin, vpH - estH - margin);

  panel.style.left = `${Math.max(margin, left)}px`;
  panel.style.top = `${Math.max(margin, top)}px`;
  panel.style.right = 'auto';
  panel.style.bottom = 'auto';
}

function showPanel(x, y, options = {}) {
  const panel = getPanel();
  if (!panel) return;
  panel.classList.toggle('hud-panel-info--anchor-stable', options.anchorStable === true);
  panel.removeAttribute('hidden');
  panel.setAttribute('aria-hidden', 'false');
  if (x != null && y != null) positionPanel(panel, x, y, options);
  if (options.reveal === false) {
    panel.classList.remove('is-visible');
    return;
  }
  requestAnimationFrame(() => {
    panel.classList.add('is-visible');
  });
  document.body.classList.add('earth-info-open');
  window.dispatchEvent(
    new CustomEvent('earth:info-card-visibility-change', { detail: { visible: true } })
  );
}

function hidePanel() {
  const panel = getPanel();
  if (panel) {
    panel.classList.remove('is-visible');
    panel.classList.remove('hud-panel-info--anchor-stable');
    panel.setAttribute('aria-hidden', 'true');
    panel.setAttribute('hidden', '');
  }
  document.body.classList.remove('earth-info-open');
  window.dispatchEvent(
    new CustomEvent('earth:info-card-visibility-change', { detail: { visible: false } })
  );
}

// No-op: event binding now happens lazily in mountCard()
export function initInfoCard() {}

export function setInfoCardNoBorder(noBorder = true) {
  const card = document.getElementById('info-card');
  if (card) {
    card.classList.toggle('no-border', noBorder);
  }
}

export function showInfoCard(type, data, options = {}) {
  const config = CARD_CONFIG[type];
  if (!config) {
    console.warn('Unknown info card type:', type);
    return;
  }

  if (document.body.classList.contains('layout-mode-mobile')) {
    currentType = type;
    pendingMobileDetailState = { type, config, data };
    ensureMobileDetailsListener();

    // Fill drawer details slot (accessible when user taps popup → opens details tab)
    const icon = document.getElementById('mobile-info-card-icon');
    const title = document.getElementById('mobile-info-card-title');
    const typeLabel = document.getElementById('mobile-info-card-type');
    const content = document.getElementById('mobile-info-card-content');

    if (icon) icon.textContent = config.icon;
    if (title) {
      title.textContent = type === 'news'
        ? (data?.title || '新闻事件')
        : config.title;
    }
    if (typeLabel) {
      typeLabel.textContent = type === 'news'
        ? 'news signal'
        : type.replaceAll('_', ' ');
    }

    if (content && type !== 'news') {
      renderMobileDetailContent(type, config, data);
      renderedMobileDetailKey = null;
    } else if (content && type === 'news' && isMobileDetailsDrawerActive()) {
      renderMobileNewsCardContent(content, data);
      renderedMobileDetailKey = getMobileDetailRenderKey(type, data);
    }

    // Show the floating mini popup near the touch point (requires coordinates)
    if (options.x != null && options.y != null) {
      ensurePopupClickHandler();
      showMobilePopup(type, data, options.x, options.y, options);
      document.body.classList.add('earth-info-open');
      window.dispatchEvent(
        new CustomEvent('earth:info-card-visibility-change', { detail: { visible: true } })
      );
    }
    return;
  }

  mountCard();

  currentType = type;
  const card = document.getElementById('info-card');
  const icon = document.getElementById('info-card-icon');
  const title = document.getElementById('info-card-title');
  const content = document.getElementById('info-card-content');

  stopTypewriterAnimation();
  card.className = 'info-card ' + config.className;
  icon.textContent = config.icon;
  title.textContent = type === 'news'
    ? (data?.title || '新闻事件')
    : config.title;

  if (type === 'news') {
    renderNewsCardContent(content, data);
  } else {
    renderDefaultCardContent(content, config, data);
  }
  showPanel(options.x, options.y, options);
}

export function hideInfoCard() {
  stopTypewriterAnimation();
  if (document.body.classList.contains('layout-mode-mobile')) {
    hideMobilePopup();
    document.body.classList.remove('earth-info-open');
    window.dispatchEvent(
      new CustomEvent('earth:info-card-visibility-change', { detail: { visible: false } })
    );
    currentType = null;
    pendingMobileDetailState = null;
    renderedMobileDetailKey = null;
    return;
  }
  hidePanel();
  currentType = null;
}

export function getCurrentType() {
  return currentType;
}