let globalSearchTimer = null;

function openGlobalSearch() {
  if (!state.user) return;
  toggleHeaderCommandMenu(false);
  openModalDialog(elements.globalSearchDialog);
  requestAnimationFrame(() => {
    elements.globalSearchInput.focus();
    elements.globalSearchInput.select();
  });
}
function handleGlobalSearchShortcut(event) {
  if (!event.ctrlKey || event.altKey || event.shiftKey || event.key.toLowerCase() !== "k") return;
  if (!state.user) return;
  if (event.defaultPrevented) {
    showToast("Ctrl+K 已被其他功能占用，请点击顶部搜索按钮");
    return;
  }
  event.preventDefault();
  openGlobalSearch();
}

function closeGlobalSearch() {
  clearTimeout(globalSearchTimer);
  if (elements.globalSearchDialog.open) elements.globalSearchDialog.close();
}

function scheduleGlobalSearch() {
  clearTimeout(globalSearchTimer);
  const query = elements.globalSearchInput.value.trim();
  state.globalSearchActiveIndex = -1;
  if (!query) {
    state.globalSearchResults = [];
    renderGlobalSearchEmpty("输入名称或代码开始搜索", "使用方向键选择，回车打开详情", "corner-down-left");
    return;
  }
  elements.globalSearchResults.innerHTML = '<div class="global-search-loading"><span class="spinner" aria-hidden="true"></span><span>正在搜索</span></div>';
  globalSearchTimer = setTimeout(() => runGlobalSearch(query), 160);
}

async function runGlobalSearch(query) {
  const requestSequence = ++state.globalSearchRequestSequence;
  const params = new URLSearchParams({ q: query, trade_date: elements.tradeDate.value });
  try {
    const payload = await apiRequest(`/api/search?${params}`);
    if (requestSequence !== state.globalSearchRequestSequence || elements.globalSearchInput.value.trim() !== query) return;
    renderGlobalSearchResults(payload.groups || {});
  } catch (error) {
    if (requestSequence !== state.globalSearchRequestSequence) return;
    state.globalSearchResults = [];
    renderGlobalSearchEmpty(error.message || "搜索失败", "请稍后重试", "circle-alert");
  }
}

function renderGlobalSearchResults(groups) {
  const definitions = [
    ["stocks", "股票"],
    ["sectors", "板块"],
    ["themes", "题材"],
    ["indices", "指数"],
  ];
  const iconNames = { stock: "chart-candlestick", sector: "layout-grid", theme: "lightbulb", index: "chart-line" };
  const flattened = [];
  const sections = [];
  definitions.forEach(([key, label]) => {
    const items = Array.isArray(groups[key]) ? groups[key] : [];
    if (!items.length) return;
    const rows = items.map((item) => {
      const index = flattened.length;
      flattened.push(item);
      return `<button class="global-search-result" type="button" role="option" aria-selected="false" data-search-result-index="${index}">
        <span class="global-search-result-icon"><i data-lucide="${iconNames[item.type] || "search"}"></i></span>
        <span class="global-search-result-copy"><strong>${escapeHtml(item.name || "--")}</strong><span>${escapeHtml(item.subtitle || item.type_label || label)}</span></span>
        <span class="global-search-result-code">${escapeHtml(item.code || "")}</span>
      </button>`;
    }).join("");
    sections.push(`<section class="global-search-group" aria-label="${label}"><h3 class="global-search-group-title">${label}</h3>${rows}</section>`);
  });
  state.globalSearchResults = flattened;
  state.globalSearchActiveIndex = flattened.length ? 0 : -1;
  if (!flattened.length) {
    renderGlobalSearchEmpty("没有找到相关结果", "可尝试输入完整名称或六位股票代码", "search-x");
    return;
  }
  elements.globalSearchResults.innerHTML = sections.join("");
  updateGlobalSearchSelection(false);
  refreshIcons();
}

function renderGlobalSearchEmpty(title, hint, iconName) {
  elements.globalSearchResults.innerHTML = `<div class="global-search-empty"><i data-lucide="${iconName}"></i><p>${escapeHtml(title)}</p><span>${escapeHtml(hint)}</span></div>`;
  refreshIcons();
}

function handleGlobalSearchInputKeydown(event) {
  if (event.key === "Escape") {
    event.preventDefault();
    closeGlobalSearch();
    return;
  }
  if (!["ArrowDown", "ArrowUp", "Enter"].includes(event.key)) return;
  if (!state.globalSearchResults.length) return;
  event.preventDefault();
  if (event.key === "Enter") {
    openGlobalSearchResult(state.globalSearchActiveIndex);
    return;
  }
  const direction = event.key === "ArrowDown" ? 1 : -1;
  state.globalSearchActiveIndex = (state.globalSearchActiveIndex + direction + state.globalSearchResults.length) % state.globalSearchResults.length;
  updateGlobalSearchSelection(true);
}

function updateGlobalSearchSelection(scrollIntoView) {
  elements.globalSearchResults.querySelectorAll("[data-search-result-index]").forEach((item) => {
    const selected = number(item.dataset.searchResultIndex) === state.globalSearchActiveIndex;
    item.classList.toggle("is-active", selected);
    item.setAttribute("aria-selected", String(selected));
    if (selected && scrollIntoView) item.scrollIntoView({ block: "nearest" });
  });
}

function openGlobalSearchResult(index) {
  const item = state.globalSearchResults[index];
  if (!item) return;
  closeGlobalSearch();
  if (item.type === "stock") {
    openStock(item.id, { code: item.code, name: item.name, sector: item.industry || "其他" });
    return;
  }
  openEntityDetail(item);
}