"use client";

import { useParams, useSearchParams, useRouter } from "next/navigation";
import { useEffect, useState, useCallback } from "react";
import { authFetch } from "@/lib/auth";
import Link from "next/link";
import dynamic from "next/dynamic";
import {
  ArrowLeft,
  CheckCircle,
  PauseCircle,
  AlertCircle,
  Clock,
} from "lucide-react";

// ─── Dynamic imports for each strategy's pages ───────────────────
const SignalsV53 = dynamic(() => import("@/app/signals-v53/page"), { ssr: false });
const SignalsV53Fast = dynamic(() => import("@/app/signals-v53fast/page"), { ssr: false });
const SignalsV53Middle = dynamic(() => import("@/app/signals-v53middle/page"), { ssr: false });
const PaperV53 = dynamic(() => import("@/app/paper-v53/page"), { ssr: false });
const PaperV53Fast = dynamic(() => import("@/app/paper-v53fast/page"), { ssr: false });
const PaperV53Middle = dynamic(() => import("@/app/paper-v53middle/page"), { ssr: false });

// ─── Types ────────────────────────────────────────────────────────
interface StrategySummary {
  id: string;
  display_name: string;
  status: string;
  started_at: number;
  initial_balance: number;
  current_balance: number;
  net_usdt: number;
  net_r: number;
  trade_count: number;
  win_rate: number;
  avg_win_r: number;
  avg_loss_r: number;
  open_positions: number;
  pnl_usdt_24h: number;
  pnl_r_24h: number;
  cvd_windows?: string;
  description?: string;
}

// ─── Helpers ──────────────────────────────────────────────────────
function fmtDur(ms: number) {
  const s = Math.floor((Date.now() - ms) / 1000);
  const d = Math.floor(s / 86400);
  const h = Math.floor((s % 86400) / 3600);
  const m = Math.floor((s % 3600) / 60);
  if (d > 0) return `${d}天${h}h`;
  if (h > 0) return `${h}h${m}m`;
  return `${m}m`;
}

function StatusBadge({ status }: { status: string }) {
  if (status === "running") return <span className="flex items-center gap-1 text-xs text-emerald-400"><CheckCircle size={12} />运行中</span>;
  if (status === "paused") return <span className="flex items-center gap-1 text-xs text-yellow-400"><PauseCircle size={12} />已暂停</span>;
  return <span className="flex items-center gap-1 text-xs text-red-400"><AlertCircle size={12} />异常</span>;
}

// ─── Content router ───────────────────────────────────────────────
function SignalsContent({ strategyId }: { strategyId: string }) {
  if (strategyId === "v53") return <SignalsV53 />;
  if (strategyId === "v53_fast") return <SignalsV53Fast />;
  if (strategyId === "v53_middle") return <SignalsV53Middle />;
  return <div className="p-8 text-gray-400">未知策略: {strategyId}</div>;
}

function PaperContent({ strategyId }: { strategyId: string }) {
  if (strategyId === "v53") return <PaperV53 />;
  if (strategyId === "v53_fast") return <PaperV53Fast />;
  if (strategyId === "v53_middle") return <PaperV53Middle />;
  return <div className="p-8 text-gray-400">未知策略: {strategyId}</div>;
}

// ─── Main Page ────────────────────────────────────────────────────
export default function StrategyDetailPage() {
  const params = useParams();
  const searchParams = useSearchParams();
  const router = useRouter();
  const strategyId = params?.id as string;
  const tab = searchParams?.get("tab") || "signals";

  const [summary, setSummary] = useState<StrategySummary | null>(null);
  const [loading, setLoading] = useState(true);

  const fetchSummary = useCallback(async () => {
    try {
      const r = await authFetch(`/api/strategy-plaza/${strategyId}/summary`);
      if (r.ok) {
        const d = await r.json();
        setSummary(d);
      }
    } catch {}
    setLoading(false);
  }, [strategyId]);

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

  if (loading) {
    return (
      <div className="flex items-center justify-center min-h-screen">
        <div className="text-gray-400 animate-pulse">加载中...</div>
      </div>
    );
  }

  const isProfit = (summary?.net_usdt ?? 0) >= 0;

  return (
    <div className="p-4 max-w-full">
      {/* Back + Strategy Header */}
      <div className="flex items-center gap-3 mb-4">
        <Link href="/strategy-plaza" className="flex items-center gap-1 text-gray-400 hover:text-white text-sm transition-colors">
          <ArrowLeft size={16} />
          策略广场
        </Link>
        <span className="text-gray-600">/</span>
        <span className="text-white font-medium">{summary?.display_name ?? strategyId}</span>
      </div>

      {/* Summary Bar */}
      {summary && (
        <div className="flex flex-wrap items-center gap-4 bg-gray-900 border border-gray-700 rounded-xl px-5 py-3 mb-4">
          <StatusBadge status={summary.status} />
          <span className="text-xs text-gray-400">
            <Clock size={10} className="inline mr-1" />运行 {fmtDur(summary.started_at)}
          </span>
          {summary.cvd_windows && (
            <span className="text-xs text-cyan-400 bg-cyan-900/30 px-2 py-0.5 rounded">CVD {summary.cvd_windows}</span>
          )}
          <span className="ml-auto flex items-center gap-4 text-sm">
            <span className="text-gray-400">胜率 <span className={summary.win_rate >= 50 ? "text-emerald-400 font-bold" : "text-yellow-400 font-bold"}>{summary.win_rate}%</span></span>
            <span className="text-gray-400">净R <span className={`font-bold ${isProfit ? "text-emerald-400" : "text-red-400"}`}>{summary.net_r >= 0 ? "+" : ""}{summary.net_r}R</span></span>
            <span className="text-gray-400">余额 <span className={`font-bold ${isProfit ? "text-emerald-400" : "text-red-400"}`}>{summary.current_balance.toLocaleString()} U</span></span>
            <span className="text-gray-400">24h <span className={`font-bold ${summary.pnl_usdt_24h >= 0 ? "text-emerald-400" : "text-red-400"}`}>{summary.pnl_usdt_24h >= 0 ? "+" : ""}{summary.pnl_usdt_24h} U</span></span>
          </span>
        </div>
      )}

      {/* Tabs */}
      <div className="flex gap-2 mb-4">
        {[
          { key: "signals", label: "📊 信号引擎" },
          { key: "paper", label: "📈 模拟盘" },
        ].map(({ key, label }) => (
          <button
            key={key}
            onClick={() => router.push(`/strategy-plaza/${strategyId}?tab=${key}`)}
            className={`px-5 py-2 rounded-lg text-sm font-medium transition-colors ${
              tab === key
                ? "bg-cyan-600 text-white"
                : "bg-gray-800 text-gray-400 hover:text-white hover:bg-gray-700"
            }`}
          >
            {label}
          </button>
        ))}
      </div>

      {/* Content — direct render of existing pages */}
      <div>
        {tab === "signals" ? (
          <SignalsContent strategyId={strategyId} />
        ) : (
          <PaperContent strategyId={strategyId} />
        )}
      </div>
    </div>
  );
}