/* LLM 速度测试台 前端逻辑 */
"use strict";

const $ = (s) => document.querySelector(s);
const $$ = (s) => Array.from(document.querySelectorAll(s));

const PROVIDER_DEFAULT_URL = {
  openai: "https://api.openai.com/v1",
  anthropic: "https://api.anthropic.com",
  google: "https://generativelanguage.googleapis.com",
};
const PROVIDER_LABEL = {
  openai: "OpenAI 兼容", anthropic: "Anthropic", google: "Google Gemini",
};
const STATUS_LABEL = {
  running: "测试中", done: "完成", error: "出错", canceled: "已取消",
};

let currentTestId = null;   // 正在跑的测试 id
let pollTimer = null;
let lastLogId = 0;
let consoleLogs = [];       // 当前测试已加载日志 [{id,level,msg,rel}]

// 上下文长度：chips 列表 + 启用集合（默认 512/2048/8192/32768/131072）
const DEFAULT_CONTEXT_LENGTHS = [512, 2048, 8192, 32768, 131072];
let contextLengths = [...DEFAULT_CONTEXT_LENGTHS];
let contextLengthsActive = new Set(contextLengths);

const esc = (s) => String(s ?? "").replace(/[&<>"']/g,
  (c) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[c]));
const fmt = (v, d = "—") => (v === null || v === undefined || isNaN(v) ? d : v);
const pad = (n) => String(n).padStart(2, "0");
const clock = (ts) => `${pad(ts.getHours())}:${pad(ts.getMinutes())}:${pad(ts.getSeconds())}`;

/* ───────────────────────── 通用请求 ───────────────────────── */

async function api(path, method = "GET", body) {
  const opt = { method, headers: {} };
  if (body !== undefined) { opt.headers["Content-Type"] = "application/json"; opt.body = JSON.stringify(body); }
  const resp = await fetch(path, opt);
  return resp.json();
}

/* ───────────────────────── 配置管理 ───────────────────────── */

function currentConfig() {
  return {
    name: $("#cfg-name").value.trim(),
    provider: $("#cfg-provider").value,
    base_url: $("#cfg-baseurl").value.trim(),
    api_key: $("#cfg-apikey").value.trim(),
    model: $("#cfg-model").value.trim(),
    temperature: parseFloat($("#cfg-temp").value) || 0.7,
  };
}

function currentGen() {
  const lens = contextLengths.filter((l) => contextLengthsActive.has(l));
  return {
    context_lengths: lens.length ? lens : [2048],
    max_tokens: parseInt($("#gen-max-tokens").value) || 128,
    samples: parseInt($("#gen-samples").value) || 2,
    avoid_cache: $("#gen-avoid-cache").checked,
    warmup: $("#gen-warmup").checked,
  };
}

/* ───────────────────────── 上下文长度 chips ───────────────────────── */

function renderChips() {
  const box = $("#gen-contexts");
  box.innerHTML = "";
  if (!contextLengths.length) {
    box.innerHTML = '<span class="chips-empty">暂无长度，点击下方“添加”自定义</span>';
    return;
  }
  for (const len of contextLengths) {
    const active = contextLengthsActive.has(len);
    const c = document.createElement("span");
    c.className = "chip" + (active ? "" : " off");
    c.title = "点击启用/禁用";
    c.innerHTML = `<span class="chip-v">${len}</span><span class="chip-x">✕</span>`;
    c.addEventListener("click", (e) => {
      if (e.target.closest(".chip-x")) {
        contextLengths = contextLengths.filter((x) => x !== len);
        contextLengthsActive.delete(len);
        renderChips();
      } else {
        if (contextLengthsActive.has(len)) contextLengthsActive.delete(len);
        else contextLengthsActive.add(len);
        renderChips();
      }
    });
    box.appendChild(c);
  }
}

function addContextLength() {
  const v = parseInt($("#gen-context-add").value);
  if (!v || v < 16) { toast("请输入有效长度（≥16）"); return; }
  if (!contextLengths.includes(v)) {
    contextLengths.push(v);
    contextLengthsActive.add(v);
    contextLengths.sort((a, b) => a - b);
    renderChips();
  }
  $("#gen-context-add").value = "";
}

function updateDefaultUrlHint() {
  const p = $("#cfg-provider").value;
  $("#cfg-default-url").textContent = "默认地址：" + PROVIDER_DEFAULT_URL[p];
  if (!$("#cfg-baseurl").value.trim()) {
    $("#cfg-baseurl").placeholder = "留空使用默认：" + PROVIDER_DEFAULT_URL[p];
  }
}

async function loadConfigs() {
  const list = await api("/api/configs");
  const sel = $("#cfg-list");
  const keep = sel.value;
  sel.innerHTML = '<option value="">— 选择配置加载 —</option>';
  for (const c of list) {
    const o = document.createElement("option");
    o.value = c.id;
    o.textContent = `${c.name}（${PROVIDER_LABEL[c.provider] || c.provider} / ${c.model}${c.has_key ? "" : " · 无Key"}）`;
    sel.appendChild(o);
  }
  if (keep && [...sel.options].some((o) => o.value === keep)) sel.value = keep;
}

function loadSelectedConfig() {
  const id = $("#cfg-list").value;
  if (!id) return;
  api(`/api/configs/${id}`).then((c) => {
    $("#cfg-name").value = c.name || "";
    $("#cfg-provider").value = c.provider || "openai";
    $("#cfg-baseurl").value = c.base_url || "";
    $("#cfg-apikey").value = c.api_key || "";
    $("#cfg-model").value = c.model || "";
    $("#cfg-temp").value = c.temperature ?? 0.7;
    $("#tmp-val").textContent = (c.temperature ?? 0.7).toFixed(1);
    updateDefaultUrlHint();
    flash("已加载配置：" + c.name);
  }).catch(() => toast("加载失败"));
}

/* ───────────────────────── 连接测试 ───────────────────────── */

async function testConnection() {
  const cfg = currentConfig();
  if (!cfg.api_key) { showConn(false, "请先填写 API Key"); return; }
  const box = $("#conn-result");
  box.hidden = false; box.className = "conn-result";
  box.textContent = "⏳ 正在测试连接...";
  try {
    const r = await api("/api/configs/test", "POST", cfg);
    if (r.ok) {
      const m = r.metrics || {};
      showConn(true,
        `✅ 连接成功（${r.total_ms}ms）| 首字 ${fmt(m.ttft_ms)}ms | 提示词 ${fmt(m.prompt_tokens)} tok | 输出 ${fmt(m.output_tokens)} tok${r.note ? " " + r.note : ""}`);
    } else {
      showConn(false, "❌ " + (r.error || "连接失败"));
    }
  } catch (e) {
    showConn(false, "❌ " + e.message);
  }
}
function showConn(ok, text) {
  const box = $("#conn-result");
  box.hidden = false;
  box.className = "conn-result " + (ok ? "ok" : "fail");
  box.textContent = text;
}

/* ───────────────────────── 测试运行 ───────────────────────── */

function setStatus(state, label) {
  const badge = $("#run-status");
  badge.className = "status-badge " + state;
  badge.innerHTML = `<span class="dot"></span>${label}`;
}

function clearConsole() {
  consoleLogs = [];
  $("#console").innerHTML = "";
  $("#log-count").textContent = "";
  resetMetrics();
}

function appendLogs(logs) {
  const box = $("#console");
  const atBottom = box.scrollHeight - box.scrollTop - box.clientHeight < 40;
  let html = "";
  for (const l of logs) {
    html += `<div class="ln ${esc(l.level)}"><span class="ts">[${l.rel.toFixed(3)}s]</span> ${esc(l.msg)}</div>`;
  }
  box.insertAdjacentHTML("beforeend", html);
  $("#log-count").textContent = `${consoleLogs.length} 条`;
  if (atBottom) box.scrollTop = box.scrollHeight;
}

function resetMetrics() {
  ["m-ttft", "m-prefill", "m-decode", "m-prompts", "m-outputs", "m-total"].forEach((id) => {
    const el = $(`#${id}`);
    el.textContent = "—";
    el.className = "m-value";
  });
}

function updateMetrics(m, isSummary = false) {
  if (!m) return;
  const val = (k, ak) => (m[k] !== null && m[k] !== undefined && !isNaN(m[k])) ? m[k] : m[ak];
  const set = (id, v, accent = false, good = false) => {
    const el = $(`#${id}`);
    el.textContent = fmt(v);
    el.className = "m-value" + (accent ? " accent" : "") + (good ? " good" : "");
  };
  set("m-ttft", val("ttft_ms", "avg_ttft_ms"), false, true);
  set("m-prefill", val("prefill_speed", "avg_prefill_speed"), true, false);
  set("m-decode", val("decode_speed", "avg_decode_speed"), false, true);
  set("m-prompts", val("prompt_tokens", "avg_prompt_tokens"));
  set("m-outputs", val("output_tokens", "avg_output_tokens"));
  set("m-total", val("total_ms", "avg_total_ms"));
  const u = isSummary ? "均 ms" : "ms";
  $("#m-ttft-u").textContent = u;
}

function startTest() {
  const cfg = currentConfig();
  const gen = currentGen();
  if (!cfg.api_key) { toast("请填写 API Key"); return; }
  if (!cfg.model) { toast("请填写模型名称"); return; }

  clearConsole();
  currentTestId = null;
  lastLogId = 0;
  setStatus("running", "正在测试…");
  $("#btn-start").disabled = true;
  $("#btn-cancel").disabled = false;

  api("/api/tests", "POST", { config: cfg, gen }).then((r) => {
    if (!r.ok) {
      throw new Error(r.error || "启动失败");
    }
    currentTestId = r.id;
    appendLogs([{ id: 0, level: "sys", msg: `测试 #${r.id} 已启动（${cfg.name || cfg.model}）`, rel: 0 }]);
    pollTimer = setInterval(pollLogs, 800);
    pollLogs();
  }).catch((e) => {
    setStatus("error", "启动失败");
    toast(e.message);
    $("#btn-start").disabled = false;
    $("#btn-cancel").disabled = true;
  });
}

async function pollLogs() {
  if (currentTestId == null) return;
  try {
    const d = await api(`/api/tests/${currentTestId}/logs?after=${lastLogId}`);
    if (d.logs && d.logs.length) {
      appendLogs(d.logs);
      lastLogId = d.after || lastLogId;
    }
    if (d.last_run) updateMetrics(d.last_run);
    if (d.status === "done" || d.status === "error" || d.status === "canceled") {
      finishTest(d);
    }
  } catch (e) {
    /* 网络抖动忽略 */
  }
}

function finishTest(d) {
  clearInterval(pollTimer);
  pollTimer = null;
  $("#btn-start").disabled = false;
  $("#btn-cancel").disabled = true;
  if (d.summary && d.summary.samples_ok > 0) {
    updateMetrics(d.summary, true);
  }
  const map = { done: ["done", "✅ 测试完成"], error: ["error", "⚠️ 测试出错"], canceled: ["canceled", "⏹ 已取消"] };
  const [state, label] = map[d.status] || ["done", "完成"];
  setStatus(state, label);
  if (d.status === "error" && d.error) toast("测试出错：" + d.error);
  loadHistory();
}

function stopTest() {
  if (currentTestId == null) return;
  api(`/api/tests/${currentTestId}/cancel`, "POST").then(() => toast("正在停止…"));
  $("#btn-cancel").disabled = true;
}

/* ───────────────────────── 测试历史 ───────────────────────── */

async function loadHistory() {
  const list = await api("/api/tests");
  const tb = $("#history tbody");
  tb.innerHTML = "";
  if (!list.length) {
    tb.innerHTML = '<tr><td colspan="10" style="color:var(--muted);text-align:center">暂无测试记录</td></tr>';
    return;
  }
  for (const t of list) {
    const s = t.summary || {};
    const tr = document.createElement("tr");
    tr.innerHTML = `
      <td>#${t.id}</td>
      <td>${esc(t.created_at)}</td>
      <td>${esc(PROVIDER_LABEL[t.provider] || t.provider)}</td>
      <td>${esc(t.model)}</td>
      <td class="num">${fmt(s.samples_ok)}/${fmt(s.samples_total)}</td>
      <td class="num">${fmt(s.avg_ttft_ms)}</td>
      <td class="num">${fmt(s.avg_prefill_speed)}</td>
      <td class="num">${fmt(s.avg_decode_speed)}</td>
      <td><span class="status-pill ${esc(t.status)}">${STATUS_LABEL[t.status] || t.status}</span></td>
      <td>
        <button class="btn small" data-view="${t.id}">查看</button>
        <button class="btn small" data-xlsx="${t.id}">Excel</button>
        <button class="btn small danger" data-del="${t.id}">删除</button>
      </td>`;
    tb.appendChild(tr);
  }
}

/* ───────────────────────── 详情弹窗 ───────────────────────── */

async function viewDetail(id) {
  const t = await api(`/api/tests/${id}`);
  const s = t.summary || {};
  const g = t.gen || {};
  const cfg = t.config || {};
  const runs = t.runs || [];
  const logs = t.logs || [];
  const byLength = s.by_length || {};

  let byLengthHtml;
  const lens = Object.keys(byLength).sort((a, b) => a - b);
  if (lens.length) {
    byLengthHtml = `<table class="mini"><thead><tr>
      <th>上下文长度tok</th><th>采样(成功/总数)</th><th>首字ms</th><th>预填充tok/s</th>
      <th>解码tok/s</th><th>提示词tok</th><th>输出tok</th><th>总耗时ms</th>
    </tr></thead><tbody>` +
      lens.map((L) => {
        const bl = byLength[L] || {};
        return `<tr>
          <td class="num">${L}</td>
          <td class="num">${fmt(bl.samples_ok)}/${fmt(bl.samples_total)}</td>
          <td class="num">${fmt(bl.avg_ttft_ms)}</td>
          <td class="num">${fmt(bl.avg_prefill_speed)}</td>
          <td class="num">${fmt(bl.avg_decode_speed)}</td>
          <td class="num">${fmt(bl.avg_prompt_tokens)}</td>
          <td class="num">${fmt(bl.avg_output_tokens)}</td>
          <td class="num">${fmt(bl.avg_total_ms)}</td>
        </tr>`;
      }).join("") + `</tbody></table>`;
  } else {
    byLengthHtml = '<div class="hint">无成功采样数据</div>';
  }

  let runsHtml;
  if (runs.length) {
    runsHtml = `<table class="mini"><thead><tr>
      <th>采样</th><th>上下文tok</th><th>提示词tok</th><th>缓存tok</th><th>首字ms</th><th>预填充tok/s</th>
      <th>输出tok</th><th>解码tok/s</th><th>总耗时ms</th><th>备注</th>
    </tr></thead><tbody>` +
      runs.map((r, i) => {
        const m = r.metrics || {};
        return `<tr class="${r.error ? "err" : ""}">
          <td>${i + 1}</td>
          <td class="num">${r.context_length || m.context_length || "—"}</td>
          <td class="num">${fmt(m.prompt_tokens)}</td>
          <td class="num">${fmt(m.cached_tokens, 0)}</td>
          <td class="num">${fmt(m.ttft_ms)}</td>
          <td class="num">${fmt(m.prefill_speed)}</td>
          <td class="num">${fmt(m.output_tokens)}</td>
          <td class="num">${fmt(m.decode_speed)}</td>
          <td class="num">${fmt(m.total_ms)}</td>
          <td>${r.error ? "❌ " + esc(r.error.slice(0, 60)) : "✅"}</td>
        </tr>`;
      }).join("") + `</tbody></table>`;
  } else {
    runsHtml = '<div class="hint">无采样数据</div>';
  }

  const logHtml = `<div class="detail-log">` + logs.map((l) =>
    `<div class="ln ${esc(l.level)}"><span style="color:#5b6b8c">[${l.rel.toFixed(3)}s]</span> ${esc(l.msg)}</div>`
  ).join("") + `</div>`;

  $("#dt-id").textContent = id;
  $("#dt-body").innerHTML = `
    <h3>📌 汇总指标</h3>
    <div class="kv">
      <div class="kv-item"><div class="kv-k">状态</div><div class="kv-v">${STATUS_LABEL[t.status] || t.status}</div></div>
      <div class="kv-item"><div class="kv-k">创建时间</div><div class="kv-v">${esc(t.created_at)}</div></div>
      <div class="kv-item"><div class="kv-k">提供商 / 模型</div><div class="kv-v">${esc(PROVIDER_LABEL[t.provider] || t.provider)} / ${esc(t.model)}</div></div>
      <div class="kv-item"><div class="kv-k">采样（成功/总数）</div><div class="kv-v">${fmt(s.samples_ok)} / ${fmt(s.samples_total)}</div></div>
      <div class="kv-item"><div class="kv-k">平均首字延迟</div><div class="kv-v">${fmt(s.avg_ttft_ms)} ms</div></div>
      <div class="kv-item"><div class="kv-k">最佳首字延迟</div><div class="kv-v">${fmt(s.best_ttft_ms)} ms</div></div>
      <div class="kv-item"><div class="kv-k">平均预填充速度</div><div class="kv-v">${fmt(s.avg_prefill_speed)} tok/s</div></div>
      <div class="kv-item"><div class="kv-k">平均解码速度</div><div class="kv-v">${fmt(s.avg_decode_speed)} tok/s</div></div>
      <div class="kv-item"><div class="kv-k">平均提示词</div><div class="kv-v">${fmt(s.avg_prompt_tokens)} tok</div></div>
      <div class="kv-item"><div class="kv-k">平均输出</div><div class="kv-v">${fmt(s.avg_output_tokens)} tok</div></div>
      <div class="kv-item"><div class="kv-k">平均缓存命中</div><div class="kv-v">${fmt(s.avg_cached_tokens, 0)} tok</div></div>
      <div class="kv-item"><div class="kv-k">平均总耗时</div><div class="kv-v">${fmt(s.avg_total_ms)} ms</div></div>
    </div>

    <h3>📏 按上下文长度汇总</h3>
    ${byLengthHtml}

    <h3>⚙️ 测试参数</h3>
    <div class="kv">
      <div class="kv-item"><div class="kv-k">上下文长度</div><div class="kv-v">${(g.context_lengths || []).join(" / ") || "—"} tok</div></div>
      <div class="kv-item"><div class="kv-k">解码输出长度</div><div class="kv-v">${g.max_tokens ?? "—"} tok</div></div>
      <div class="kv-item"><div class="kv-k">每个长度采样</div><div class="kv-v">${g.samples ?? "—"}</div></div>
      <div class="kv-item"><div class="kv-k">预热(空转)</div><div class="kv-v">${g.warmup === false ? "关" : "开"}</div></div>
      <div class="kv-item"><div class="kv-k">避免缓存</div><div class="kv-v">${g.avoid_cache ? "开" : "关"}</div></div>
      <div class="kv-item"><div class="kv-k">温度</div><div class="kv-v">${fmt(cfg.temperature)}</div></div>
      <div class="kv-item"><div class="kv-k">Base URL</div><div class="kv-v">${esc(cfg.base_url || "（默认）")}</div></div>
      <div class="kv-item"><div class="kv-k">校准字符/token</div><div class="kv-v">${fmt(s.calibration_chars_per_token)}</div></div>
    </div>

    <h3>📊 每次采样明细</h3>
    ${runsHtml}

    <h3>📋 完整日志</h3>
    ${logHtml}
    ${t.error ? `<div class="conn-result fail" style="margin-top:10px">错误信息：${esc(t.error)}</div>` : ""}
  `;

  $("#detail-mask").hidden = false;
  $("#dt-body").scrollTop = 0;
  window.__detail = t;
}

function closeDetail() { $("#detail-mask").hidden = true; }

function exportDetail() {
  if (!window.__detail) return;
  download(JSON.stringify(window.__detail, null, 2), `test_${window.__detail.id}.json`, "application/json");
}

async function exportXlsx(id) {
  try {
    const resp = await fetch(`/api/tests/${id}/export.xlsx`);
    if (!resp.ok) {
      const j = await resp.json().catch(() => ({}));
      throw new Error(j.error || "导出失败");
    }
    const blob = await resp.blob();
    const a = document.createElement("a");
    a.href = URL.createObjectURL(blob);
    a.download = `llm_speed_test_${id}.xlsx`;
    document.body.appendChild(a);
    a.click();
    setTimeout(() => { URL.revokeObjectURL(a.href); a.remove(); }, 100);
  } catch (e) {
    toast("导出失败：" + e.message);
  }
}

/* ───────────────────────── 导出 / 下载 ───────────────────────── */

function download(text, filename, type = "text/plain") {
  const blob = new Blob([text], { type });
  const a = document.createElement("a");
  a.href = URL.createObjectURL(blob);
  a.download = filename;
  document.body.appendChild(a);
  a.click();
  setTimeout(() => { URL.revokeObjectURL(a.href); a.remove(); }, 100);
}

function exportCurrentLog() {
  if (!currentTestId) { toast("当前没有进行中的测试"); return; }
  api(`/api/tests/${currentTestId}`).then((t) => {
    const lines = t.logs.map((l) => `[${l.rel.toFixed(3)}s] [${l.level}] ${l.msg}`).join("\n");
    const head = `# LLM 速度测试日志  test#${t.id}  ${t.created_at}\n# 状态: ${t.status}  提供商: ${t.provider}  模型: ${t.model}\n`;
    download(head + lines + "\n", `llm_test_${t.id}.log`, "text/plain");
  });
}

/* ───────────────────────── 提示 ───────────────────────── */

function toast(msg) {
  const el = document.createElement("div");
  el.textContent = msg;
  el.style.cssText = "position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#1d2538;border:1px solid var(--accent);color:#fff;padding:10px 18px;border-radius:10px;z-index:999;font-size:13px;box-shadow:0 6px 20px rgba(0,0,0,.4)";
  document.body.appendChild(el);
  setTimeout(() => el.remove(), 3200);
}

function flash(msg) {
  toast(msg);
}

/* ───────────────────────── 事件绑定 ───────────────────────── */

function bind() {
  $("#cfg-provider").addEventListener("change", updateDefaultUrlHint);
  $("#cfg-temp").addEventListener("input", () => $("#tmp-val").textContent = parseFloat($("#cfg-temp").value).toFixed(1));

  $("#btn-toggle-key").addEventListener("click", () => {
    const inp = $("#cfg-apikey");
    inp.type = inp.type === "password" ? "text" : "password";
  });
  $("#btn-save-config").addEventListener("click", async () => {
    const r = await api("/api/configs", "POST", currentConfig());
    if (r.ok) { toast("配置已保存"); loadConfigs(); }
    else toast(r.error || "保存失败");
  });
  $("#btn-load-config").addEventListener("click", loadSelectedConfig);
  $("#btn-del-config").addEventListener("click", async () => {
    const id = $("#cfg-list").value;
    if (!id) { toast("请先选择要删除的配置"); return; }
    if (!confirm("确定删除该配置？")) return;
    await api(`/api/configs/${id}`, "DELETE");
    toast("已删除"); loadConfigs();
  });

  $("#btn-test-conn").addEventListener("click", testConnection);
  $("#btn-start").addEventListener("click", startTest);
  $("#btn-cancel").addEventListener("click", stopTest);
  $("#btn-context-add").addEventListener("click", addContextLength);
  $("#gen-context-add").addEventListener("keydown", (e) => { if (e.key === "Enter") addContextLength(); });

  $("#btn-clear-console").addEventListener("click", clearConsole);
  $("#btn-export-log").addEventListener("click", exportCurrentLog);
  $("#btn-refresh-history").addEventListener("click", loadHistory);

  $("#history tbody").addEventListener("click", (e) => {
    const v = e.target.closest("[data-view]");
    const x = e.target.closest("[data-xlsx]");
    const d = e.target.closest("[data-del]");
    if (v) viewDetail(Number(v.dataset.view));
    if (x) exportXlsx(Number(x.dataset.xlsx));
    if (d) {
      const id = Number(d.dataset.del);
      if (confirm(`确定删除测试 #${id} 及其全部日志？`)) {
        api(`/api/tests/${id}`, "DELETE").then(() => loadHistory());
      }
    }
  });

  $("#dt-close").addEventListener("click", closeDetail);
  $("#detail-mask").addEventListener("click", (e) => { if (e.target === $("#detail-mask")) closeDetail(); });
  $("#dt-export").addEventListener("click", exportDetail);
  $("#dt-export-xlsx").addEventListener("click", () => { if (window.__detail) exportXlsx(window.__detail.id); });

  document.addEventListener("keydown", (e) => { if (e.key === "Escape") closeDetail(); });
}

/* ───────────────────────── 初始化 ───────────────────────── */

(async function init() {
  bind();
  renderChips();
  updateDefaultUrlHint();
  loadConfigs();
  loadHistory();
  setInterval(() => { if (!currentTestId) loadHistory(); }, 30000); // 空闲时定期刷新历史
})();