"use client";

import { useEffect, useState, useCallback } from "react";
import { authFetch } from "@/lib/auth";
import { useAuth } from "@/lib/auth";
import Link from "next/link";
import {
  ComposedChart, Area, Line, XAxis, YAxis, Tooltip, ResponsiveContainer,
  ReferenceLine, CartesianGrid, Legend
} from "recharts";

type Symbol = "BTC" | "ETH" | "XRP" | "SOL";

interface IndicatorRow {
  ts: number;
  cvd_fast: number;
  cvd_mid: number;
  cvd_day: number;
  atr_5m: number;
  vwap_30m: number;
  price: number;
  score: number;
  signal: string | null;
}

interface LatestIndicator {
  ts: number;
  cvd_fast: number;
  cvd_mid: number;
  cvd_day: number;
  cvd_fast_slope: number;
  atr_5m: number;
  atr_percentile: number;
  vwap_30m: number;
  price: number;
  p95_qty: number;
  p99_qty: number;
  score: number;
  signal: string | null;
  tier?: "light" | "standard" | "heavy" | null;
  factors?: {
    direction?: { score?: number };
    crowding?: { score?: number };
    environment?: { score?: number };
    confirmation?: { score?: number };
    auxiliary?: { score?: number };
  } | null;
}

interface MarketIndicatorValue {
  value: Record<string, unknown>;
  ts: number;
}

interface MarketIndicatorSet {
  long_short_ratio?: MarketIndicatorValue;
  top_trader_position?: MarketIndicatorValue;
  open_interest_hist?: MarketIndicatorValue;
  coinbase_premium?: MarketIndicatorValue;
}

const WINDOWS = [
  { label: "1h", value: 60 },
  { label: "4h", value: 240 },
  { label: "12h", value: 720 },
  { label: "24h", value: 1440 },
];

function bjtStr(ms: number) {
  const d = new Date(ms + 8 * 3600 * 1000);
  return `${String(d.getUTCHours()).padStart(2, "0")}:${String(d.getUTCMinutes()).padStart(2, "0")}`;
}

function fmt(v: number, decimals = 1): string {
  if (Math.abs(v) >= 1000000) return `${(v / 1000000).toFixed(1)}M`;
  if (Math.abs(v) >= 1000) return `${(v / 1000).toFixed(1)}K`;
  return v.toFixed(decimals);
}

function pct(v: number, digits = 1): string {
  return `${(v * 100).toFixed(digits)}%`;
}

function LayerScore({ label, score, max, colorClass }: { label: string; score: number; max: number; colorClass: string }) {
  const ratio = Math.max(0, Math.min((score / max) * 100, 100));
  return (
    <div className="flex items-center gap-2">
      <span className="text-[10px] text-slate-500 w-6 shrink-0">{label}</span>
      <div className="flex-1 h-1.5 rounded-full bg-slate-100 overflow-hidden">
        <div className={`h-full ${colorClass}`} style={{ width: `${ratio}%` }} />
      </div>
      <span className="text-[10px] font-mono text-slate-600 w-8 text-right">{score}/{max}</span>
    </div>
  );
}

function MarketIndicatorsCards({ symbol }: { symbol: Symbol }) {
  const [data, setData] = useState<MarketIndicatorSet | null>(null);

  useEffect(() => {
    const fetch = async () => {
      try {
        const res = await authFetch("/api/signals/market-indicators");
        if (!res.ok) return;
        const json = await res.json();
        setData(json[symbol] || null);
      } catch {}
    };
    fetch();
    const iv = setInterval(fetch, 5000);
    return () => clearInterval(iv);
  }, [symbol]);

  if (!data) return <div className="text-center text-slate-400 text-sm py-3">等待市场指标数据...</div>;

  // value可能是JSON字符串或对象，统一解析
  const parseVal = (v: unknown): Record<string, unknown> => {
    if (!v) return {};
    if (typeof v === "string") { try { return JSON.parse(v); } catch { return {}; } }
    if (typeof v === "object") return v as Record<string, unknown>;
    return {};
  };

  const lsVal = parseVal(data.long_short_ratio?.value);
  const topVal = parseVal(data.top_trader_position?.value);
  const oiVal = parseVal(data.open_interest_hist?.value);
  const premVal = parseVal(data.coinbase_premium?.value);

  const longPct = Number(lsVal?.longAccount ?? 0.5) * 100;
  const shortPct = Number(lsVal?.shortAccount ?? 0.5) * 100;
  const topLong = Number(topVal?.longAccount ?? 0.5) * 100;
  const topShort = Number(topVal?.shortAccount ?? 0.5) * 100;
  const oiValue = Number(oiVal?.sumOpenInterestValue ?? 0);
  const oiDisplay = oiValue >= 1e9 ? `$${(oiValue / 1e9).toFixed(2)}B` : oiValue >= 1e6 ? `$${(oiValue / 1e6).toFixed(0)}M` : `$${oiValue.toFixed(0)}`;
  const premium = Number(premVal?.premium_pct ?? 0);

  return (
    <div className="grid grid-cols-4 gap-1.5">
      <div className="bg-slate-50 rounded-lg px-2 py-1.5">
        <p className="text-[10px] text-slate-400">多空比</p>
        <p className="text-xs font-mono text-slate-800">L:{longPct.toFixed(1)}% S:{shortPct.toFixed(1)}%</p>
      </div>
      <div className="bg-slate-50 rounded-lg px-2 py-1.5">
        <p className="text-[10px] text-slate-400">大户持仓</p>
        <p className="text-xs font-mono text-slate-800">多{topLong.toFixed(1)}% {topLong >= 55 ? "📈" : topLong <= 45 ? "📉" : "➖"}</p>
      </div>
      <div className="bg-slate-50 rounded-lg px-2 py-1.5">
        <p className="text-[10px] text-slate-400">OI</p>
        <p className="text-xs font-mono text-slate-800">{oiDisplay}</p>
      </div>
      <div className="bg-slate-50 rounded-lg px-2 py-1.5">
        <p className="text-[10px] text-slate-400">CB Premium</p>
        <p className={`text-xs font-mono ${premium >= 0 ? "text-emerald-600" : "text-red-500"}`}>{premium >= 0 ? "+" : ""}{premium.toFixed(4)}%</p>
      </div>
    </div>
  );
}

// ─── 信号历史 ────────────────────────────────────────────────────

interface SignalRecord {
  ts: number;
  score: number;
  signal: string;
}

function bjtFull(ms: number) {
  const d = new Date(ms + 8 * 3600 * 1000);
  return `${String(d.getUTCMonth() + 1).padStart(2, "0")}-${String(d.getUTCDate()).padStart(2, "0")} ${String(d.getUTCHours()).padStart(2, "0")}:${String(d.getUTCMinutes()).padStart(2, "0")}:${String(d.getUTCSeconds()).padStart(2, "0")}`;
}

function SignalHistory({ symbol }: { symbol: Symbol }) {
  const [data, setData] = useState<SignalRecord[]>([]);

  useEffect(() => {
    const fetchData = async () => {
      try {
        const res = await authFetch(`/api/signals/signal-history?symbol=${symbol}&limit=20&strategy=v51_baseline`);
        if (!res.ok) return;
        const json = await res.json();
        setData(json.data || []);
      } catch {}
    };
    fetchData();
    const iv = setInterval(fetchData, 15000);
    return () => clearInterval(iv);
  }, [symbol]);

  if (data.length === 0) return null;

  return (
    <div className="rounded-xl border border-slate-200 bg-white shadow-sm overflow-hidden">
      <div className="px-3 py-2 border-b border-slate-100">
        <h3 className="font-semibold text-slate-800 text-xs">最近信号</h3>
      </div>
      <div className="divide-y divide-slate-100 max-h-48 overflow-y-auto">
        {data.map((s, i) => (
          <div key={i} className="px-3 py-1.5 flex items-center justify-between">
            <div className="flex items-center gap-2">
              <span className={`text-xs font-bold ${s.signal === "LONG" ? "text-emerald-600" : "text-red-500"}`}>
                {s.signal === "LONG" ? "🟢 LONG" : "🔴 SHORT"}
              </span>
              <span className="text-[10px] text-slate-400">{bjtFull(s.ts)}</span>
            </div>
            <div className="flex items-center gap-1.5">
              <span className="font-mono text-xs text-slate-700">{s.score}</span>
              <span className={`text-[10px] px-1 py-0.5 rounded ${
                s.score >= 85 ? "bg-red-100 text-red-700" :
                s.score >= 75 ? "bg-blue-100 text-blue-700" :
                "bg-slate-100 text-slate-600"
              }`}>
                {s.score >= 85 ? "加仓" : s.score >= 75 ? "标准" : "轻仓"}
              </span>
            </div>
          </div>
        ))}
      </div>
    </div>
  );
}

// ─── 实时指标卡片 ────────────────────────────────────────────────

function IndicatorCards({ symbol }: { symbol: Symbol }) {
  const [data, setData] = useState<LatestIndicator | null>(null);

  useEffect(() => {
    const fetch = async () => {
      try {
        const res = await authFetch("/api/signals/latest?strategy=v51_baseline");
        if (!res.ok) return;
        const json = await res.json();
        setData(json[symbol] || null);
      } catch {}
    };
    fetch();
    const iv = setInterval(fetch, 5000);
    return () => clearInterval(iv);
  }, [symbol]);

  if (!data) return <div className="text-center text-slate-400 text-sm py-4">等待指标数据...</div>;

  const cvdFastDir = data.cvd_fast > 0 ? "多" : "空";
  const cvdMidDir = data.cvd_mid > 0 ? "多" : "空";
  const priceVsVwap = data.price > data.vwap_30m ? "上方" : "下方";

  // 核心条件检查
  const core1 = data.cvd_fast > 0 && data.cvd_fast_slope > 0 ? "✅" : data.cvd_fast < 0 && data.cvd_fast_slope < 0 ? "✅空" : "⬜";
  const core2 = data.cvd_mid !== 0 ? "✅" : "⬜";
  const core3 = data.price !== data.vwap_30m ? "✅" : "⬜";

  return (
    <div className="space-y-3">
      {/* CVD三轨 - 紧凑一行 */}
      <div className="grid grid-cols-3 gap-1.5">
        <div className="bg-white rounded-lg border border-slate-200 px-2.5 py-2">
          <p className="text-[10px] text-slate-400">CVD_fast (30m)</p>
          <p className={`font-mono font-bold text-sm ${data.cvd_fast >= 0 ? "text-emerald-600" : "text-red-500"}`}>
            {fmt(data.cvd_fast)}
          </p>
          <p className="text-[10px] text-slate-400">
            斜率: <span className={data.cvd_fast_slope >= 0 ? "text-emerald-600" : "text-red-500"}>
              {data.cvd_fast_slope >= 0 ? "↑" : "↓"}{fmt(Math.abs(data.cvd_fast_slope))}
            </span>
          </p>
        </div>
        <div className="bg-white rounded-lg border border-slate-200 px-2.5 py-2">
          <p className="text-[10px] text-slate-400">CVD_mid (4h)</p>
          <p className={`font-mono font-bold text-sm ${data.cvd_mid >= 0 ? "text-emerald-600" : "text-red-500"}`}>
            {fmt(data.cvd_mid)}
          </p>
          <p className="text-[10px] text-slate-400">{cvdMidDir}头占优</p>
        </div>
        <div className="bg-white rounded-lg border border-slate-200 px-2.5 py-2">
          <p className="text-[10px] text-slate-400">CVD_day</p>
          <p className={`font-mono font-bold text-sm ${data.cvd_day >= 0 ? "text-emerald-600" : "text-red-500"}`}>
            {fmt(data.cvd_day)}
          </p>
          <p className="text-[10px] text-slate-400">盘中基线</p>
        </div>
      </div>

      {/* ATR + VWAP + 大单 - 4列紧凑 */}
      <div className="grid grid-cols-4 gap-1.5">
        <div className="bg-white rounded-lg border border-slate-200 px-2.5 py-2">
          <p className="text-[10px] text-slate-400">ATR</p>
          <p className="font-mono font-semibold text-sm text-slate-800">${fmt(data.atr_5m, 2)}</p>
          <p className="text-[10px]">
            <span className={data.atr_percentile > 60 ? "text-amber-600 font-semibold" : "text-slate-400"}>
              {data.atr_percentile.toFixed(0)}%{data.atr_percentile > 60 ? "🔥" : ""}
            </span>
          </p>
        </div>
        <div className="bg-white rounded-lg border border-slate-200 px-2.5 py-2">
          <p className="text-[10px] text-slate-400">VWAP</p>
          <p className="font-mono font-semibold text-sm text-slate-800">${data.vwap_30m.toLocaleString("en-US", { maximumFractionDigits: 1 })}</p>
          <p className="text-[10px]">
            价格在<span className={data.price > data.vwap_30m ? "text-emerald-600" : "text-red-500"}>{priceVsVwap}</span>
          </p>
        </div>
        <div className="bg-white rounded-lg border border-slate-200 px-2.5 py-2">
          <p className="text-[10px] text-slate-400">P95</p>
          <p className="font-mono font-semibold text-sm text-slate-800">{data.p95_qty.toFixed(4)}</p>
          <p className="text-[10px] text-slate-400">大单阈值</p>
        </div>
        <div className="bg-white rounded-lg border border-slate-200 px-2.5 py-2">
          <p className="text-[10px] text-slate-400">P99</p>
          <p className="font-mono font-semibold text-sm text-amber-600">{data.p99_qty.toFixed(4)}</p>
          <p className="text-[10px] text-slate-400">超大单</p>
        </div>
      </div>

      {/* 信号状态（V5.1）- 紧凑版 */}
      <div className={`rounded-xl border px-3 py-2.5 ${
        data.signal === "LONG" ? "border-emerald-300 bg-emerald-50" :
        data.signal === "SHORT" ? "border-red-300 bg-red-50" :
        "border-slate-200 bg-slate-50"
      }`}>
        <div className="flex items-center justify-between">
          <div>
            <p className="text-[10px] text-slate-500">当前信号</p>
            <p className={`font-bold text-base ${
              data.signal === "LONG" ? "text-emerald-700" :
              data.signal === "SHORT" ? "text-red-600" :
              "text-slate-400"
            }`}>
              {data.signal === "LONG" ? "🟢 做多" : data.signal === "SHORT" ? "🔴 做空" : "⚪ 无信号"}
            </p>
          </div>
          <div className="text-right">
            <p className="font-mono font-bold text-lg text-slate-800">{data.score}/100</p>
            <p className="text-[10px] text-slate-500">{data.tier === "heavy" ? "加仓" : data.tier === "standard" ? "标准" : data.tier === "light" ? "轻仓" : "不开仓"}</p>
          </div>
        </div>
        <div className="mt-2 space-y-1">
          <LayerScore label="方向" score={data.factors?.direction?.score ?? Math.min(Math.round(data.score * 0.45), 45)} max={45} colorClass="bg-blue-600" />
          <LayerScore label="拥挤" score={data.factors?.crowding?.score ?? Math.min(Math.round(data.score * 0.20), 20)} max={20} colorClass="bg-violet-600" />
          <LayerScore label="环境" score={data.factors?.environment?.score ?? Math.min(Math.round(data.score * 0.15), 15)} max={15} colorClass="bg-emerald-600" />
          <LayerScore label="确认" score={data.factors?.confirmation?.score ?? Math.min(Math.round(data.score * 0.15), 15)} max={15} colorClass="bg-amber-500" />
          <LayerScore label="辅助" score={data.factors?.auxiliary?.score ?? Math.min(Math.round(data.score * 0.05), 5)} max={5} colorClass="bg-slate-500" />
        </div>
      </div>
    </div>
  );
}

// ─── CVD三轨图 ──────────────────────────────────────────────────

function CVDChart({ symbol, minutes }: { symbol: Symbol; minutes: number }) {
  const [data, setData] = useState<IndicatorRow[]>([]);
  const [loading, setLoading] = useState(true);

  const fetchData = useCallback(async (silent = false) => {
    try {
      const res = await authFetch(`/api/signals/indicators?symbol=${symbol}&minutes=${minutes}`);
      if (!res.ok) return;
      const json = await res.json();
      setData(json.data || []);
      if (!silent) setLoading(false);
    } catch {}
  }, [symbol, minutes]);

  useEffect(() => {
    setLoading(true);
    fetchData();
    const iv = setInterval(() => fetchData(true), 30000);
    return () => clearInterval(iv);
  }, [fetchData]);

  const chartData = data.map(d => ({
    time: bjtStr(d.ts),
    fast: parseFloat(d.cvd_fast?.toFixed(2) || "0"),
    mid: parseFloat(d.cvd_mid?.toFixed(2) || "0"),
    price: d.price,
  }));

  // 价格轴自适应
  const prices = chartData.map(d => d.price).filter(v => v > 0);
  const pMin = prices.length ? Math.min(...prices) : 0;
  const pMax = prices.length ? Math.max(...prices) : 0;
  const pPad = (pMax - pMin) * 0.3 || pMax * 0.001;

  if (loading) return <div className="flex items-center justify-center h-48 text-slate-400 text-sm">加载指标数据...</div>;
  if (data.length === 0) return <div className="flex items-center justify-center h-48 text-slate-400 text-sm">暂无指标数据，signal-engine需运行积累</div>;

  return (
    <ResponsiveContainer width="100%" height={220}>
      <ComposedChart data={chartData} margin={{ top: 4, right: 60, bottom: 0, left: 8 }}>
        <CartesianGrid strokeDasharray="3 3" stroke="#f1f5f9" />
        <XAxis dataKey="time" tick={{ fill: "#94a3b8", fontSize: 10 }} tickLine={false} interval="preserveStartEnd" />
        <YAxis yAxisId="cvd" tick={{ fill: "#94a3b8", fontSize: 10 }} tickLine={false} axisLine={false} width={55} />
        <YAxis yAxisId="price" orientation="right" tick={{ fill: "#f59e0b", fontSize: 10 }} tickLine={false} axisLine={false} width={65}
          domain={[Math.floor(pMin - pPad), Math.ceil(pMax + pPad)]}
          tickFormatter={(v: number) => v >= 1000 ? `$${(v / 1000).toFixed(1)}k` : `$${v.toFixed(0)}`}
        />
        <Tooltip
          // eslint-disable-next-line @typescript-eslint/no-explicit-any
          formatter={(v: any, name: any) => {
            if (name === "price") return [`$${Number(v).toLocaleString()}`, "币价"];
            if (name === "fast") return [fmt(Number(v)), "CVD_fast(30m)"];
            return [fmt(Number(v)), "CVD_mid(4h)"];
          }}
          contentStyle={{ background: "#fff", border: "1px solid #e2e8f0", borderRadius: 8, fontSize: 11 }}
        />
        <Legend wrapperStyle={{ fontSize: 11 }} />
        <ReferenceLine yAxisId="cvd" y={0} stroke="#94a3b8" strokeDasharray="4 2" />
        <Area yAxisId="cvd" type="monotone" dataKey="fast" name="fast" stroke="#2563eb" fill="#eff6ff" strokeWidth={1.5} dot={false} connectNulls />
        <Line yAxisId="cvd" type="monotone" dataKey="mid" name="mid" stroke="#7c3aed" strokeWidth={1.5} dot={false} connectNulls strokeDasharray="6 3" />
        <Line yAxisId="price" type="monotone" dataKey="price" name="price" stroke="#f59e0b" strokeWidth={1.5} dot={false} connectNulls strokeDasharray="4 2" />
      </ComposedChart>
    </ResponsiveContainer>
  );
}

// ─── 主页面 ──────────────────────────────────────────────────────

export default function SignalsPage() {
  const { isLoggedIn, loading } = useAuth();
  const [symbol, setSymbol] = useState<Symbol>("BTC");
  const [minutes, setMinutes] = useState(240);

  if (loading) return <div className="flex items-center justify-center h-64 text-slate-400">加载中...</div>;
  if (!isLoggedIn) return (
    <div className="flex flex-col items-center justify-center h-64 gap-4">
      <div className="text-5xl">🔒</div>
      <p className="text-slate-600 font-medium">请先登录查看信号数据</p>
      <div className="flex gap-2">
        <Link href="/login" className="bg-blue-600 text-white px-4 py-2 rounded-lg text-sm">登录</Link>
        <Link href="/register" className="border border-slate-300 text-slate-600 px-4 py-2 rounded-lg text-sm">注册</Link>
      </div>
    </div>
  );

  return (
    <div className="space-y-3">
      {/* 标题 */}
      <div className="flex items-center justify-between flex-wrap gap-2">
        <div>
          <h1 className="text-lg font-bold text-slate-900">⚡ 信号引擎 V5.1</h1>
          <p className="text-slate-500 text-[10px]">五层100分评分 · 市场拥挤度 · 环境确认</p>
        </div>
        <div className="flex gap-1">
          {(["BTC", "ETH", "XRP", "SOL"] as Symbol[]).map(s => (
            <button key={s} onClick={() => setSymbol(s)}
              className={`px-3 py-1 rounded-lg border text-xs font-medium transition-colors ${symbol === s ? "bg-blue-600 text-white border-blue-600" : "border-slate-200 text-slate-600 hover:border-blue-400"}`}>
              {s}
            </button>
          ))}
        </div>
      </div>

      {/* 实时指标卡片 */}
      <IndicatorCards symbol={symbol} />

      {/* Market Indicators */}
      <div className="rounded-xl border border-slate-200 bg-white px-3 py-2">
        <h3 className="font-semibold text-slate-800 text-xs mb-1.5">Market Indicators</h3>
        <MarketIndicatorsCards symbol={symbol} />
      </div>

      {/* 信号历史 */}
      <SignalHistory symbol={symbol} />

      {/* CVD三轨图 */}
      <div className="rounded-xl border border-slate-200 bg-white shadow-sm overflow-hidden">
        <div className="px-3 py-2 border-b border-slate-100 flex items-center justify-between flex-wrap gap-1">
          <div>
            <h3 className="font-semibold text-slate-800 text-xs">CVD三轨 + 币价</h3>
            <p className="text-[10px] text-slate-400">蓝=fast(30m) · 紫=mid(4h) · 橙=价格</p>
          </div>
          <div className="flex gap-1">
            {WINDOWS.map(w => (
              <button key={w.value} onClick={() => setMinutes(w.value)}
                className={`px-2 py-1 rounded border text-xs transition-colors ${minutes === w.value ? "bg-slate-800 text-white border-slate-800" : "border-slate-200 text-slate-500 hover:border-slate-400"}`}>
                {w.label}
              </button>
            ))}
          </div>
        </div>
        <div className="px-3 py-2">
          <CVDChart symbol={symbol} minutes={minutes} />
        </div>
      </div>

      {/* 说明 */}
      <div className="rounded-xl border border-slate-200 bg-white shadow-sm overflow-hidden">
        <div className="px-3 py-2 border-b border-slate-100">
          <h3 className="font-semibold text-slate-800 text-xs">📖 五层信号源说明</h3>
        </div>
        <div className="px-3 py-2 space-y-2 text-[11px] text-slate-600">
          <div>
            <span className="font-bold text-slate-800">1️⃣ 方向层（45分）</span>
            <span className="text-slate-500"> — 钱往哪流？</span>
            <p className="mt-0.5">CVD三轨（30m/4h资金流向）+ P99大单流（鲸鱼动向）+ 加速度奖励。两条CVD同向+大单配合 = 高分。</p>
          </div>
          <div>
            <span className="font-bold text-slate-800">2️⃣ 拥挤层（20分）</span>
            <span className="text-slate-500"> — 散户在干嘛？反着来</span>
            <p className="mt-0.5">多空比（散户仓位）+ 大户持仓比。散户疯狂做多→做空加分，跟大户同向加分。</p>
          </div>
          <div>
            <span className="font-bold text-slate-800">3️⃣ 环境层（15分）</span>
            <span className="text-slate-500"> — 有没有新钱进场？</span>
            <p className="mt-0.5">OI变化率（未平仓合约）。OI上涨=新资金进场=趋势延续；OI下降=资金撤离。</p>
          </div>
          <div>
            <span className="font-bold text-slate-800">4️⃣ 确认层（15分）</span>
            <span className="text-slate-500"> — 多周期共振吗？</span>
            <p className="mt-0.5">CVD_fast(30m)和CVD_mid(4h)方向一致=高确信度满分15；方向矛盾=0分。</p>
          </div>
          <div>
            <span className="font-bold text-slate-800">5️⃣ 辅助层（5分）</span>
            <span className="text-slate-500"> — 美国机构在干嘛？</span>
            <p className="mt-0.5">Coinbase Premium（CB vs 币安价差）。正溢价=机构买入=做多加分；负溢价=机构卖出。</p>
          </div>
          <div className="pt-1 border-t border-slate-100">
            <span className="text-blue-600 font-medium">档位：</span>&lt;60不开仓 · 60-74轻仓 · 75-84标准 · ≥85加仓 · 冷却10分钟
          </div>
        </div>
      </div>
    </div>
  );
}
