"use client";

/**
 * 实验归档 + **对比**（微调闭环的核心）。
 *
 * 过去这一页只能「看详情 / 复跑」，微调时只能翻列表比数字。现在：
 * - 勾选 2~3 个实验 → 净值曲线归一化为「累计收益率 %」叠加（消除初始资金差异），
 *   因此可以直接看出「改了哪个参数、曲线变好还是变坏」；
 * - 指标对比表：每个指标一行、每个实验一列，最后一列是与第一个实验的**差值**；
 * - 参数 diff 表：把 config_snapshot 扁平化后逐项对比，默认只显示「有差异」的项 ——
 *   微调时一眼看出「这次到底改了什么」。
 *
 * 曲线用 TradingView Lightweight Charts（全站统一图表基座）。
 */
import { Suspense, useCallback, useEffect, useMemo, useState } from "react";
import Link from "next/link";
import { useSearchParams } from "next/navigation";
import { apiGet, apiGetWithHeaders, apiPost } from "@/lib/api";
import { experimentKindLabel } from "@/lib/labels";
import type { BacktestResult, ExperimentDetail, ExperimentMeta } from "@/lib/types";
import { isBacktestDetail, type BacktestDetail } from "@/lib/archive";
import {
  PageHeader,
  Card,
  Pill,
  Btn,
  Banner,
  Empty,
  Metric,
  SkeletonLines,
  Loading,
} from "@/components/ui";
import { Icon } from "@/components/icons";
import { LwChart, type LwSeries } from "@/components/charts/LwChart";
import { CHART, seriesColor } from "@/components/charts/theme";

/**
 * 类型徽标的**色调**（措辞统一走 `lib/labels.ts::experimentKindLabel`）。
 *
 * 之前这里自己维护了一份 `KIND_MAP` 文案，只覆盖 backtest/factor_test，
 * 于是 `selection` 在表格里显示成英文原值 `selection`，而同一页的筛选下拉写「选股」、
 * 归档页写「选股」—— 同一口径三种叫法。现在文案只有一份，这里只管颜色。
 */
const KIND_TONE: Record<string, "accent" | "violet" | "default"> = {
  backtest: "accent",
  factor_test: "violet",
  selection: "default",
};

function kindView(kind: string) {
  return <Pill tone={KIND_TONE[kind] ?? "default"}>{experimentKindLabel(kind)}</Pill>;
}

function statusView(status: string) {
  switch (status) {
    case "queued":
      return <Pill tone="accent">排队中</Pill>;
    case "running":
      return <Pill tone="accent" icon="spinner">执行中</Pill>;
    case "success":
      return <Pill tone="pos" icon="check">完成</Pill>;
    case "failed":
      return <Pill tone="neg" icon="alert">失败</Pill>;
    default:
      return <Pill>{status || "—"}</Pill>;
  }
}

/** config_snapshot 扁平化：嵌套对象转成 a.b.c 路径，便于逐项 diff */
function flatten(obj: unknown, prefix = "", out: Record<string, string> = {}): Record<string, string> {
  if (obj === null || obj === undefined) {
    out[prefix || "—"] = "—";
    return out;
  }
  if (Array.isArray(obj)) {
    out[prefix] = obj.length ? JSON.stringify(obj) : "[]";
    return out;
  }
  if (typeof obj === "object") {
    const entries = Object.entries(obj as Record<string, unknown>);
    if (!entries.length) {
      out[prefix || "—"] = "{}";
      return out;
    }
    for (const [k, v] of entries) flatten(v, prefix ? `${prefix}.${k}` : k, out);
    return out;
  }
  out[prefix || "—"] = String(obj);
  return out;
}

/** 数据指纹在列表里只显示关键前缀（完整值放 title，悬停可见） */
function shortDataVersion(v: string): string {
  return v.length > 28 ? `${v.slice(0, 28)}…` : v;
}

const METRICS: { key: keyof BacktestResult["summary"]; label: string; fmt: (v: number) => string; better?: "high" | "low" }[] = [
  { key: "total_return_pct", label: "区间收益", fmt: (v) => `${v >= 0 ? "+" : ""}${v.toFixed(2)}%`, better: "high" },
  { key: "annual_return_pct", label: "年化收益", fmt: (v) => `${v >= 0 ? "+" : ""}${v.toFixed(2)}%`, better: "high" },
  { key: "sharpe", label: "Sharpe", fmt: (v) => v.toFixed(3), better: "high" },
  { key: "max_drawdown_pct", label: "最大回撤", fmt: (v) => `${v.toFixed(2)}%`, better: "low" },
  { key: "volatility_pct", label: "年化波动", fmt: (v) => `${v.toFixed(2)}%`, better: "low" },
  { key: "win_rate_pct", label: "胜率", fmt: (v) => `${v.toFixed(2)}%`, better: "high" },
  { key: "total_trades", label: "成交笔数", fmt: (v) => String(v) },
  { key: "avg_turnover_pct", label: "平均换手", fmt: (v) => `${v.toFixed(2)}%` },
  { key: "final_equity", label: "期末权益", fmt: (v) => v.toLocaleString("zh-CN", { maximumFractionDigits: 0 }) },
];

/**
 * Next 15 要求 `useSearchParams` 处于 Suspense 边界内。
 * `?exp=EXP-x,EXP-y` 用于从其它页面直接带实验进对比（策略库一键回测后「去对比」）。
 */
export default function ExperimentsPage() {
  return (
    <Suspense fallback={<Loading label="加载实验页…" />}>
      <ExperimentsInner />
    </Suspense>
  );
}

function ExperimentsInner() {
  const search = useSearchParams();
  const [exps, setExps] = useState<ExperimentMeta[]>([]);
  const [loading, setLoading] = useState(true);
  const [detail, setDetail] = useState<ExperimentDetail | null>(null);
  const [detailLoading, setDetailLoading] = useState(false);
  const [jobId, setJobId] = useState("");
  const [jobStatus, setJobStatus] = useState("");
  const [error, setError] = useState("");

  // 对比状态
  const [picked, setPicked] = useState<string[]>([]);
  const [compare, setCompare] = useState<BacktestDetail[] | null>(null);
  const [comparing, setComparing] = useState(false);
  const [onlyDiff, setOnlyDiff] = useState(true);

  // 列表过滤：后端支持 kind/q（并把过滤后总数放在 X-Total-Count 响应头）。
  // 初始值取自 URL（`?q=`/`?kind=`），且每次改动**回写 URL**：筛选条件可分享、刷新不丢，
  // 也让「当前看到的是哪一批」有据可查（而不是只存在于组件状态里）。
  const [q, setQ] = useState(() => search.get("q") ?? "");
  const [kind, setKind] = useState(() => search.get("kind") ?? "");
  const [total, setTotal] = useState<number | null>(null);

  const syncUrl = useCallback(
    (nextQ: string, nextKind: string) => {
      const params = new URLSearchParams();
      if (nextKind) params.set("kind", nextKind);
      if (nextQ.trim()) params.set("q", nextQ.trim());
      // 保留已勾选的对比实验，避免筛一下就丢掉选择
      const exp = search.get("exp");
      if (exp) params.set("exp", exp);
      const qs = params.toString();
      window.history.replaceState(null, "", qs ? `/experiments?${qs}` : "/experiments");
    },
    [search]
  );

  const load = useCallback(() => {
    const params = new URLSearchParams();
    if (kind) params.set("kind", kind);
    if (q.trim()) params.set("q", q.trim());
    const qs = params.toString();
    apiGetWithHeaders<ExperimentMeta[]>(`/experiments${qs ? `?${qs}` : ""}`)
      .then(({ data, headers }) => {
        setExps(data);
        const t = headers.get("X-Total-Count");
        setTotal(t ? Number(t) : data.length);
      })
      .catch((e: Error) => setError(e.message))
      .finally(() => setLoading(false));
  }, [q, kind]);

  useEffect(load, [load]);

  // 从 URL 预勾选要对比的实验（最多 3 个，与手动勾选同一上限）
  useEffect(() => {
    const raw = search.get("exp");
    if (!raw) return;
    const ids = raw
      .split(",")
      .map((x) => x.trim())
      .filter(Boolean)
      .slice(0, 3);
    if (ids.length) setPicked(ids);
    // 仅在首次进入时读一次，避免用户手动改选后被 URL 覆盖
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  function open(id: string) {
    setDetailLoading(true);
    setDetail(null);
    apiGet<ExperimentDetail>(`/experiments/${id}`)
      .then((d) => setDetail(d))
      .catch((e: Error) => setError(e.message))
      .finally(() => setDetailLoading(false));
  }

  function rerun(exp: ExperimentMeta) {
    setError("");
    setJobId("");
    setJobStatus("submitting");
    apiPost<{ job_id: string; status: string }>(`/experiments/${exp.id}/rerun`, {})
      .then((r) => {
        setJobId(r.job_id);
        setJobStatus(r.status);
        poll(r.job_id);
      })
      .catch((e: Error) => setError(e.message));
  }

  function poll(id: string) {
    let tries = 0;
    const timer = window.setInterval(() => {
      tries += 1;
      apiGet<{ status: string }>(`/jobs/${id}`)
        .then((j) => {
          setJobStatus(j.status);
          if (j.status === "success" || j.status === "failed" || tries > 60) {
            window.clearInterval(timer);
            load();
            setDetail(null);
          }
        })
        .catch(() => window.clearInterval(timer));
    }, 1200);
  }

  function togglePick(id: string) {
    setError("");
    setPicked((prev) => {
      if (prev.includes(id)) return prev.filter((x) => x !== id);
      if (prev.length >= 3) {
        setError("最多同时对比 3 个实验（再多曲线会互相遮挡，也不利于读图）");
        return prev;
      }
      return [...prev, id];
    });
  }

  async function runCompare() {
    setComparing(true);
    setError("");
    try {
      const rows = await Promise.all(
        picked.map((id) => apiGet<ExperimentDetail>(`/experiments/${id}`))
      );
      const usable = rows.filter(isBacktestDetail);
      if (usable.length < 2) {
        setError("所选实验里可对比的净值曲线不足 2 条（因子测试没有净值曲线）。");
        setCompare(null);
      } else {
        setCompare(usable);
      }
    } catch (e) {
      setError((e as Error).message);
    } finally {
      setComparing(false);
    }
  }

  const s = detail && isBacktestDetail(detail) ? detail.result.summary : undefined;

  return (
    <>
      <PageHeader
        title="实验对比"
        sub="每次因子测试与回测自动归档（含 Research Spec 与代码版本），保证可复现；勾选 2~3 个即可叠加净值曲线、对比指标与参数差异。"
        actions={
          exps.length > 0 ? (
            <Pill tone="accent" icon="archive">
              共 {exps.length} 个实验
            </Pill>
          ) : undefined
        }
      />

      {error ? <Banner tone="error">{error}</Banner> : null}

      {picked.length > 0 ? (
        <div className="sticky-bar">
          <Pill tone="violet" icon="layers">
            已选 {picked.length} 个
          </Pill>
          <span className="hint">{picked.join(" · ")}</span>
          <Btn variant="primary" icon="chartLine" loading={comparing} disabled={comparing || picked.length < 2} onClick={runCompare}>
            对比选中的实验
          </Btn>
          <Btn icon="x" onClick={() => { setPicked([]); setCompare(null); }}>
            清空
          </Btn>
          {picked.length < 2 ? <span className="hint">再选 1 个即可对比</span> : null}
        </div>
      ) : null}

      {compare ? (
        <CompareView rows={compare} onlyDiff={onlyDiff} setOnlyDiff={setOnlyDiff} onClose={() => setCompare(null)} />
      ) : null}

      {jobId ? (
        <Card
          icon="refresh"
          title={`复跑任务 ${jobId}`}
          tools={statusView(jobStatus === "submitting" ? "queued" : jobStatus)}
        >
          <div className="hint">任务状态实时轮询；完成后列表自动刷新，可直接展开查看最新结果。</div>
        </Card>
      ) : null}

      <Card
        id="list"
        icon="archive"
        title="实验列表"
        sub={
          total !== null
            ? `显示 ${exps.length} 条 / 共 ${total} 条${
                total > exps.length ? "（后端单页上限内未列全，可用搜索或类型筛选缩小范围）" : ""
              }`
            : "勾选左侧方框可选 2~3 个做对比"
        }
        tools={
          <div className="row" style={{ gap: 8 }}>
            <input
              className="input input--search"
              placeholder="搜索 ID / 因子 / 摘要"
              value={q}
              onChange={(e) => {
                setQ(e.target.value);
                syncUrl(e.target.value, kind);
              }}
              aria-label="搜索实验"
            />
            <select
              className="input input--filter"
              value={kind}
              onChange={(e) => {
                setKind(e.target.value);
                syncUrl(q, e.target.value);
              }}
              aria-label="按类型筛选"
            >
              <option value="">全部类型</option>
              <option value="backtest">回测</option>
              <option value="factor_test">因子测试</option>
              <option value="selection">选股</option>
            </select>
            {q || kind ? (
              <Btn size="sm" icon="x" onClick={() => { setQ(""); setKind(""); syncUrl("", ""); }}>
                清除
              </Btn>
            ) : null}
          </div>
        }
        flush
      >
        {loading ? (
          <div style={{ padding: 18 }}>
            <SkeletonLines n={6} />
          </div>
        ) : exps.length === 0 && (q || kind) ? (
          /* 筛选无结果 ≠ 没有归档：文案必须区分，否则用户会以为归档全丢了 */
          <Empty
            icon="search"
            title="没有匹配的归档"
            hint={`筛选条件：${[q ? `关键词「${q}」` : "", kind ? `类型「${experimentKindLabel(kind)}」` : ""]
              .filter(Boolean)
              .join(" · ")}；共 ${total} 条归档。清除筛选即可看到全部。`}
          />
        ) : exps.length === 0 ? (
          <Empty
            icon="archive"
            title="暂无实验"
            hint="在「选股回测」或「因子研究」中运行一次，即会自动归档于此。"
          />
        ) : (
          <div className="table-wrap">
            <table className="tbl">
              <thead>
                <tr>
                  <th style={{ width: 36 }} aria-label="选择对比" />
                  <th>ID</th>
                  <th>类型</th>
                  <th>因子</th>
                  <th>区间</th>
                  <th>摘要</th>
                  <th>版本（代码 / 数据）</th>
                  <th>体积</th>
                  <th style={{ width: 260, textAlign: "right" }}>操作</th>
                </tr>
              </thead>
              <tbody>
                {exps.map((e) => (
                  <tr key={e.id} className={detail?.id === e.id ? "row-active" : undefined}>
                    <td>
                      {/* 整个单元都是热区：16px 的方块本身达不到点击目标下限 */}
                      <label className="check check--cell" title={`选择 ${e.id} 用于对比`}>
                        <input
                          type="checkbox"
                          checked={picked.includes(e.id)}
                          onChange={() => togglePick(e.id)}
                          aria-label={`选择 ${e.id} 用于对比`}
                        />
                      </label>
                    </td>
                    <td className="cell-mono cell-strong">{e.id}</td>
                    <td>{kindView(e.kind)}</td>
                    <td>
                      <span className="row" style={{ gap: 4 }}>
                        {e.factors.map((f) => (
                          <span key={f} className="tag tag--mono">
                            {f}
                          </span>
                        ))}
                      </span>
                    </td>
                    <td className="cell-mono">{e.period ? `${e.period[0]}~${e.period[1]}` : "—"}</td>
                    <td className="hint">{e.summary_text ?? "—"}</td>
                    <td>
                      <span className="row" style={{ gap: 4 }}>
                        {e.code_version ? (
                          <span className="tag tag--mono" title="代码版本">{e.code_version}</span>
                        ) : (
                          <span className="hint">—</span>
                        )}
                        {e.data_version ? (
                          <span className="tag tag--mono" title={`数据快照：${e.data_version}`}>
                            {shortDataVersion(e.data_version)}
                          </span>
                        ) : (
                          <span className="hint" title="该归档早于数据指纹上线，不可严格复现">无数据版本</span>
                        )}
                      </span>
                    </td>
                    <td className="mono dim">
                      {e.result_bytes ? `${(e.result_bytes / 1024).toFixed(0)} KB` : "—"}
                    </td>
                    <td style={{ textAlign: "right" }}>
                      <span className="row" style={{ justifyContent: "flex-end", gap: 6 }}>
                        <Link href={`/experiments/${encodeURIComponent(e.id)}`} className="btn btn--sm">
                          <span>打开归档</span>
                        </Link>
                        <Btn size="sm" icon="search" onClick={() => open(e.id)}>
                          详情
                        </Btn>
                        <Link href={`/backtest?from_experiment=${encodeURIComponent(e.id)}`} className="btn btn--sm">
                          <span>以此参数再跑</span>
                        </Link>
                        <Btn
                          size="sm"
                          variant="primary"
                          icon="refresh"
                          onClick={() => rerun(e)}
                          disabled={jobStatus === "running" || jobStatus === "queued" || jobStatus === "submitting"}
                        >
                          复跑
                        </Btn>
                      </span>
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        )}
      </Card>

      {detail ? (
        <Card
          icon="book"
          title={`${detail.id} · ${detail.factors.join("、")}`}
          sub={detail.period ? `${detail.period[0]} ~ ${detail.period[1]}` : undefined}
          tools={
            <div className="row" style={{ gap: 8 }}>
              <Link href={`/experiments/${encodeURIComponent(detail.id)}`} className="btn btn--sm">
                <span>打开归档（完整视图）</span>
              </Link>
              <Btn size="sm" onClick={() => setDetail(null)}>
                <Icon name="x" size={13} />
                关闭
              </Btn>
            </div>
          }
        >
          {detailLoading ? (
            <SkeletonLines n={3} />
          ) : (
            <>
              {s ? (
                <div className="metric-grid" style={{ marginBottom: 0 }}>
                  <Metric
                    label="区间收益"
                    tone={s.total_return_pct >= 0 ? "pos" : "neg"}
                    value={`${s.total_return_pct >= 0 ? "+" : ""}${s.total_return_pct.toFixed(2)}%`}
                  />
                  <Metric
                    label="年化收益"
                    tone={s.annual_return_pct >= 0 ? "pos" : "neg"}
                    value={`${s.annual_return_pct >= 0 ? "+" : ""}${s.annual_return_pct.toFixed(2)}%`}
                  />
                  <Metric label="Sharpe" value={s.sharpe.toFixed(2)} />
                  <Metric label="最大回撤" tone="neg" value={`${s.max_drawdown_pct.toFixed(2)}%`} />
                </div>
              ) : (
                <div className="hint">该实验没有可展示的汇总结果（可能是因子测试或历史版本）。</div>
              )}
              {detail && isBacktestDetail(detail) && detail.result.equity_curve.length ? (
                <div style={{ marginTop: 12 }}>
                  <LwChart
                    series={[
                      {
                        key: "eq",
                        label: "累计收益率（%）",
                        type: "area",
                        color: CHART.accent,
                        data: normalize(detail.result),
                        lastValueVisible: true,
                      },
                    ]}
                    height={260}
                    valueFormat={(v) => `${v.toFixed(2)}%`}
                    zeroLine
                    ariaLabel={`${detail.id} 累计收益率曲线`}
                  />
                </div>
              ) : null}
              {detail.spec ? (
                <details style={{ marginTop: 12 }}>
                  <summary className="hint" style={{ cursor: "pointer" }}>
                    查看 spec（可复现输入）
                  </summary>
                  <pre className="mono" style={{ whiteSpace: "pre-wrap", fontSize: 12 }}>
                    {JSON.stringify(detail.spec, null, 2)}
                  </pre>
                </details>
              ) : null}
            </>
          )}
        </Card>
      ) : null}
    </>
  );
}

/* ------------------------------------------------------------------ */

/** 净值曲线 → 累计收益率 %（以首个点为基准，消除初始资金差异后可直接叠加） */
function normalize(r: BacktestResult): { time: string; value: number }[] {
  const base = r.equity_curve[0]?.value || 1;
  return r.equity_curve.map((p) => ({ time: p.date, value: (p.value / base - 1) * 100 }));
}

/** 参数签名：一眼看出这一版的关键旋钮（微调时最重要） */
function sig(r: BacktestResult): string {
  const c = r.config_snapshot as {
    selection?: { top_n?: number; hold_top_x?: number | null };
    selection_interval_months?: number | null;
    rebalance_interval_months?: number | null;
    price_adjustment?: string;
    factors?: { name: string; weight: number }[];
    costs?: { commission_rate?: number; min_commission?: number };
    universe?: { exclude_st?: boolean; min_listing_days?: number };
  };
  const parts = [
    (c.factors ?? []).map((f) => f.name).join("+") || "—",
    `n=${c.selection?.top_n ?? "—"}/x=${c.selection?.hold_top_x ?? "—"}`,
    `m=${c.selection_interval_months ?? "—"}/y=${c.rebalance_interval_months ?? "—"}`,
    c.price_adjustment ?? "—",
    c.universe?.exclude_st ? "剔ST" : "含ST",
    `佣金${(((c.costs?.commission_rate ?? 0) * 100) as number).toFixed(3)}%`,
  ];
  return parts.join(" · ");
}

function CompareView({
  rows,
  onlyDiff,
  setOnlyDiff,
  onClose,
}: {
  rows: BacktestDetail[];
  onlyDiff: boolean;
  setOnlyDiff: (v: boolean) => void;
  onClose: () => void;
}) {
  const series = useMemo<LwSeries[]>(
    () =>
      rows.map((r, i) => ({
        key: r.id,
        label: `${r.id}（${sig(r.result)}）`,
        color: seriesColor(i),
        data: normalize(r.result),
        type: "line" as const,
        lineWidth: 2 as const,
        lastValueVisible: i === 0,
      })),
    [rows]
  );

  // 参数 diff：扁平化后并集，只显示有差异的项（默认）
  const diffRows = useMemo(() => {
    const flat = rows.map((r) => flatten(r.result?.config_snapshot ?? {}));
    const keys = Array.from(new Set(flat.flatMap((f) => Object.keys(f)))).sort();
    return keys
      // price_basis.* 是回测运行元数据（数据快照/复权缺口核对），不是用户可调的旋钮：
      // 混进「参数差异」表只会制造噪声（复权口径本身在顶层 price_adjustment 里已展示）
      .filter((k) => !k.startsWith("price_basis."))
      .map((k) => ({ key: k, vals: flat.map((f) => f[k] ?? "—") }))
      .filter((row) => (onlyDiff ? new Set(row.vals).size > 1 : true));
  }, [rows, onlyDiff]);

  const base = rows[0].result.summary;

  return (
    <Card
      icon="chartLine"
      title={`实验对比 · ${rows.length} 个`}
      sub={rows.map((r) => r.id).join("  vs  ")}
      tools={
        <div className="row" style={{ gap: 8 }}>
          <label className="cmp-badge" style={{ cursor: "pointer" }}>
            <input type="checkbox" checked={onlyDiff} onChange={(e) => setOnlyDiff(e.target.checked)} />
            参数只显示有差异项
          </label>
          <Btn size="sm" onClick={onClose}>
            <Icon name="x" size={13} />
            关闭对比
          </Btn>
        </div>
      }
    >
      <LwChart
        series={series}
        height={360}
        valueFormat={(v) => `${v.toFixed(2)}%`}
        zeroLine
        ariaLabel="实验净值曲线叠加对比"
      />
      <div className="hint" style={{ marginTop: 6 }}>
        曲线已归一化为**累计收益率 %**（各自以首个净值为 0%），因此初始资金不同也能直接比。
        点击图例可临时隐藏某条曲线（只算收益差的实验建议隐藏基准再比）。
      </div>

      <div className="table-wrap" style={{ marginTop: 14 }}>
        <table className="tbl">
          <thead>
            <tr>
              <th>指标</th>
              {rows.map((r) => (
                <th key={r.id}>{r.id}</th>
              ))}
              <th>相对 {rows[0].id} 的差值</th>
            </tr>
          </thead>
          <tbody>
            {METRICS.map((m) => {
              const vals = rows.map((r) => Number(r.result!.summary[m.key] ?? 0));
              const delta = vals[vals.length - 1] - vals[0];
              const good =
                m.better === undefined
                  ? null
                  : m.better === "high"
                    ? delta > 0
                    : delta < 0;
              return (
                <tr key={String(m.key)}>
                  <td className="cell-strong">{m.label}</td>
                  {vals.map((v, i) => (
                    <td key={rows[i].id} className="num">
                      {m.fmt(v)}
                      {i === 0 ? <span className="hint"> （基准）</span> : null}
                    </td>
                  ))}
                  <td className={delta === 0 ? "cmp-diff-same" : good ? "cmp-diff-add" : "cmp-diff-del"}>
                    {m.better === undefined
                      ? m.fmt(delta)
                      : `${delta >= 0 ? "+" : ""}${m.fmt(delta)}`}
                    {good !== null && delta !== 0 ? (good ? " ✅" : " ⚠️") : ""}
                  </td>
                </tr>
              );
            })}
          </tbody>
        </table>
      </div>
      <div className="hint" style={{ marginTop: 6 }}>
        差额列 = 最后一个实验 − 基准（{rows[0].id}）。✅ 表示该指标改善方向，⚠️ 表示变差
        （收益/夏普/胜率越高越好，回撤/波动越低越好）。基准区间收益{" "}
        {base.total_return_pct.toFixed(2)}%。
      </div>

      <div style={{ marginTop: 16 }}>
        <b style={{ fontSize: 13 }}>参数差异（config_snapshot 逐项对比）</b>
        {diffRows.length === 0 ? (
          <div className="hint" style={{ marginTop: 6 }}>
            这几个实验的参数快照完全一致（说明结果是**同一配置**下的数据变动，或只是复跑）。
            已排除 price_basis.* 运行元数据。
          </div>
        ) : (
          <div className="table-wrap" style={{ marginTop: 6 }}>
            <table className="tbl">
              <thead>
                <tr>
                  <th>参数</th>
                  {rows.map((r) => (
                    <th key={r.id}>{r.id}</th>
                  ))}
                </tr>
              </thead>
              <tbody>
                {diffRows.map((row) => (
                  <tr key={row.key}>
                    <td className="cell-mono">{row.key}</td>
                    {row.vals.map((v, i) => (
                      <td
                        key={rows[i].id}
                        className={
                          new Set(row.vals).size > 1 && v !== row.vals[0] ? "cmp-diff-add num" : "num"
                        }
                      >
                        {v}
                      </td>
                    ))}
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        )}
        {onlyDiff ? (
          <div className="hint" style={{ marginTop: 6 }}>
            已隐藏所有实验取值相同的参数（取消上方勾选可看全量）。
          </div>
        ) : null}
      </div>
    </Card>
  );
}