import { useMemo } from 'react';
import {
  LineChart,
  Line,
  XAxis,
  YAxis,
  CartesianGrid,
  Tooltip,
  ResponsiveContainer,
  ReferenceLine,
  Legend,
} from 'recharts';
import useSWR from 'swr';
import { api } from '../lib/api';
import type { CompetitionTraderData } from '../types';
import { getTraderColor } from '../utils/traderColors';
import { useLanguage } from '../contexts/LanguageContext';
import { t } from '../i18n/translations';

interface ComparisonChartProps {
  traders: CompetitionTraderData[];
}

export function ComparisonChart({ traders }: ComparisonChartProps) {
  const { language } = useLanguage();
  // 获取所有trader的历史数据 - 使用单个useSWR并发请求所有trader数据
  // 生成唯一的key，当traders变化时会触发重新请求
  const tradersKey = traders.map(t => t.trader_id).sort().join(',');

  const { data: allTraderHistories, isLoading } = useSWR(
    traders.length > 0 ? `all-equity-histories-${tradersKey}` : null,
    async () => {
      // 并发请求所有trader的历史数据
      const promises = traders.map(trader =>
        api.getEquityHistory(trader.trader_id)
      );
      return Promise.all(promises);
    },
    {
      refreshInterval: 30000, // 30秒刷新（对比图表数据更新频率较低）
      revalidateOnFocus: false,
      dedupingInterval: 20000,
    }
  );

  // 将数据转换为与原格式兼容的结构
  const traderHistories = useMemo(() => {
    if (!allTraderHistories) {
      return traders.map(() => ({ data: undefined }));
    }
    return allTraderHistories.map(data => ({ data }));
  }, [allTraderHistories, traders.length]);

  // 使用useMemo自动处理数据合并，直接使用data对象作为依赖
  const combinedData = useMemo(() => {
    // 等待所有数据加载完成
    const allLoaded = traderHistories.every((h) => h.data);
    if (!allLoaded) return [];

    console.log(`[${new Date().toISOString()}] Recalculating chart data...`);

    // 新方案：按时间戳分组，不再依赖 cycle_number（因为后端会重置）
    // 收集所有时间戳
    const timestampMap = new Map<string, {
      timestamp: string;
      time: string;
      traders: Map<string, { pnl_pct: number; equity: number }>;
    }>();

    traderHistories.forEach((history, index) => {
      const trader = traders[index];
      if (!history.data) return;

      console.log(`Trader ${trader.trader_id}: ${history.data.length} data points`);

      history.data.forEach((point: any) => {
        const ts = point.timestamp;

        if (!timestampMap.has(ts)) {
          const time = new Date(ts).toLocaleTimeString('zh-CN', {
            hour: '2-digit',
            minute: '2-digit',
          });
          timestampMap.set(ts, {
            timestamp: ts,
            time,
            traders: new Map()
          });
        }

        timestampMap.get(ts)!.traders.set(trader.trader_id, {
          pnl_pct: point.total_pnl_pct,
          equity: point.total_equity
        });
      });
    });

    // 按时间戳排序，转换为数组
    const combined = Array.from(timestampMap.entries())
      .sort(([tsA], [tsB]) => new Date(tsA).getTime() - new Date(tsB).getTime())
      .map(([ts, data], index) => {
        const entry: any = {
          index: index + 1,  // 使用序号代替cycle
          time: data.time,
          timestamp: ts
        };

        traders.forEach((trader) => {
          const traderData = data.traders.get(trader.trader_id);
          if (traderData) {
            entry[`${trader.trader_id}_pnl_pct`] = traderData.pnl_pct;
            entry[`${trader.trader_id}_equity`] = traderData.equity;
          }
        });

        return entry;
      });

    if (combined.length > 0) {
      const lastPoint = combined[combined.length - 1];
      console.log(`Chart: ${combined.length} data points, last time: ${lastPoint.time}, timestamp: ${lastPoint.timestamp}`);
    }

    return combined;
  }, [allTraderHistories, traders]);

  if (isLoading) {
    return (
      <div className="text-center py-16" style={{ color: '#848E9C' }}>
        <div className="spinner mx-auto mb-4"></div>
        <div className="text-sm font-semibold">Loading comparison data...</div>
      </div>
    );
  }

  if (combinedData.length === 0) {
    return (
      <div className="text-center py-16" style={{ color: '#848E9C' }}>
        <div className="text-6xl mb-4 opacity-50">📊</div>
        <div className="text-lg font-semibold mb-2">{t('noHistoricalData', language)}</div>
        <div className="text-sm">{t('dataWillAppear', language)}</div>
      </div>
    );
  }

  // 限制显示数据点
  const MAX_DISPLAY_POINTS = 2000;
  const displayData =
    combinedData.length > MAX_DISPLAY_POINTS
      ? combinedData.slice(-MAX_DISPLAY_POINTS)
      : combinedData;

  // 计算Y轴范围
  const calculateYDomain = () => {
    const allValues: number[] = [];
    displayData.forEach((point) => {
      traders.forEach((trader) => {
        const value = point[`${trader.trader_id}_pnl_pct`];
        if (value !== undefined) {
          allValues.push(value);
        }
      });
    });

    if (allValues.length === 0) return [-5, 5];

    const minVal = Math.min(...allValues);
    const maxVal = Math.max(...allValues);
    const range = Math.max(Math.abs(maxVal), Math.abs(minVal));
    const padding = Math.max(range * 0.2, 1); // 至少留1%余量

    return [
      Math.floor(minVal - padding),
      Math.ceil(maxVal + padding)
    ];
  };

  // 使用统一的颜色分配逻辑（与Leaderboard保持一致）
  const traderColor = (traderId: string) => getTraderColor(traders, traderId);

  // 自定义Tooltip - Binance Style
  const CustomTooltip = ({ active, payload }: any) => {
    if (active && payload && payload.length) {
      const data = payload[0].payload;
      return (
        <div className="rounded p-3 shadow-xl" style={{ background: '#1E2329', border: '1px solid #2B3139' }}>
          <div className="text-xs mb-2" style={{ color: '#848E9C' }}>
            {data.time} - #{data.index}
          </div>
          {traders.map((trader) => {
            const pnlPct = data[`${trader.trader_id}_pnl_pct`];
            const equity = data[`${trader.trader_id}_equity`];
            if (pnlPct === undefined) return null;

            return (
              <div key={trader.trader_id} className="mb-1.5 last:mb-0">
                <div
                  className="text-xs font-semibold mb-0.5"
                  style={{ color: traderColor(trader.trader_id) }}
                >
                  {trader.trader_name}
                </div>
                <div className="text-sm mono font-bold" style={{ color: pnlPct >= 0 ? '#0ECB81' : '#F6465D' }}>
                  {pnlPct >= 0 ? '+' : ''}{pnlPct.toFixed(2)}%
                  <span className="text-xs ml-2 font-normal" style={{ color: '#848E9C' }}>
                    ({equity?.toFixed(2)} USDT)
                  </span>
                </div>
              </div>
            );
          })}
        </div>
      );
    }
    return null;
  };

  // 计算当前差距
  const currentGap = displayData.length > 0 ? (() => {
    const lastPoint = displayData[displayData.length - 1];
    const values = traders.map(t => lastPoint[`${t.trader_id}_pnl_pct`] || 0);
    return Math.abs(values[0] - values[1]);
  })() : 0;

  return (
    <div>
      <div style={{ borderRadius: '8px', overflow: 'hidden' }}>
        <ResponsiveContainer width="100%" height={520}>
        <LineChart data={displayData} margin={{ top: 20, right: 30, left: 20, bottom: 40 }}>
          <defs>
            {traders.map((trader) => (
              <linearGradient
                key={`gradient-${trader.trader_id}`}
                id={`gradient-${trader.trader_id}`}
                x1="0"
                y1="0"
                x2="0"
                y2="1"
              >
                <stop offset="5%" stopColor={traderColor(trader.trader_id)} stopOpacity={0.9} />
                <stop offset="95%" stopColor={traderColor(trader.trader_id)} stopOpacity={0.2} />
              </linearGradient>
            ))}
          </defs>

          <CartesianGrid strokeDasharray="3 3" stroke="#2B3139" />

          <XAxis
            dataKey="time"
            stroke="#5E6673"
            tick={{ fill: '#848E9C', fontSize: 11 }}
            tickLine={{ stroke: '#2B3139' }}
            interval={Math.floor(displayData.length / 12)}
            angle={-15}
            textAnchor="end"
            height={60}
          />

          <YAxis
            stroke="#5E6673"
            tick={{ fill: '#848E9C', fontSize: 12 }}
            tickLine={{ stroke: '#2B3139' }}
            domain={calculateYDomain()}
            tickFormatter={(value) => `${value.toFixed(1)}%`}
            width={60}
          />

          <Tooltip content={<CustomTooltip />} />

          <ReferenceLine
            y={0}
            stroke="#474D57"
            strokeDasharray="5 5"
            strokeWidth={1.5}
            label={{
              value: 'Break Even',
              fill: '#848E9C',
              fontSize: 11,
              position: 'right',
            }}
          />

          {traders.map((trader) => (
            <Line
              key={trader.trader_id}
              type="monotone"
              dataKey={`${trader.trader_id}_pnl_pct`}
              stroke={traderColor(trader.trader_id)}
              strokeWidth={3}
              dot={displayData.length < 50 ? { fill: traderColor(trader.trader_id), r: 3 } : false}
              activeDot={{ r: 6, fill: traderColor(trader.trader_id), stroke: '#fff', strokeWidth: 2 }}
              name={trader.trader_name}
              connectNulls
            />
          ))}

          <Legend
            wrapperStyle={{ paddingTop: '20px' }}
            iconType="line"
            formatter={(value, entry: any) => {
              const traderId = traders.find((t) => value === t.trader_name)?.trader_id;
              const trader = traders.find((t) => t.trader_id === traderId);
              return (
                <span style={{ color: entry.color, fontWeight: 600, fontSize: '14px' }}>
                  {trader?.trader_name} ({trader?.ai_model.toUpperCase()})
                </span>
              );
            }}
          />
        </LineChart>
      </ResponsiveContainer>
      </div>

      {/* Stats */}
      <div className="mt-6 grid grid-cols-4 gap-4 pt-5" style={{ borderTop: '1px solid #2B3139' }}>
        <div className="p-3 rounded transition-all hover:bg-opacity-50" style={{ background: 'rgba(240, 185, 11, 0.05)' }}>
          <div className="text-xs mb-1 uppercase tracking-wider" style={{ color: '#848E9C' }}>{t('comparisonMode', language)}</div>
          <div className="text-base font-bold" style={{ color: '#EAECEF' }}>PnL %</div>
        </div>
        <div className="p-3 rounded transition-all hover:bg-opacity-50" style={{ background: 'rgba(240, 185, 11, 0.05)' }}>
          <div className="text-xs mb-1 uppercase tracking-wider" style={{ color: '#848E9C' }}>{t('dataPoints', language)}</div>
          <div className="text-base font-bold mono" style={{ color: '#EAECEF' }}>{t('count', language, {count: combinedData.length})}</div>
        </div>
        <div className="p-3 rounded transition-all hover:bg-opacity-50" style={{ background: 'rgba(240, 185, 11, 0.05)' }}>
          <div className="text-xs mb-1 uppercase tracking-wider" style={{ color: '#848E9C' }}>{t('currentGap', language)}</div>
          <div className="text-base font-bold mono" style={{ color: currentGap > 1 ? '#F0B90B' : '#EAECEF' }}>
            {currentGap.toFixed(2)}%
          </div>
        </div>
        <div className="p-3 rounded transition-all hover:bg-opacity-50" style={{ background: 'rgba(240, 185, 11, 0.05)' }}>
          <div className="text-xs mb-1 uppercase tracking-wider" style={{ color: '#848E9C' }}>{t('displayRange', language)}</div>
          <div className="text-base font-bold mono" style={{ color: '#EAECEF' }}>
            {combinedData.length > MAX_DISPLAY_POINTS
              ? `${t('recent', language)} ${MAX_DISPLAY_POINTS}`
              : t('allData', language)}
          </div>
        </div>
      </div>
    </div>
  );
}