galaxis-po/frontend/src/app/portfolio/[id]/page.tsx

'use client';

import { useEffect, useState } from 'react';
import { useRouter, useParams } from 'next/navigation';
import Link from 'next/link';
import { DashboardLayout } from '@/components/layout/dashboard-layout';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
import { TradingViewChart } from '@/components/charts/trading-view-chart';
import { DonutChart } from '@/components/charts/donut-chart';
import { api } from '@/lib/api';
import { AreaData, Time } from 'lightweight-charts';

interface HoldingWithValue {
  ticker: string;
  quantity: number;
  avg_price: number;
  current_price: number | null;
  value: number | null;
  current_ratio: number | null;
  profit_loss: number | null;
  profit_loss_ratio: number | null;
}

interface Target {
  ticker: string;
  target_ratio: number;
}

interface Transaction {
  id: number;
  ticker: string;
  transaction_type: string;
  quantity: number;
  price: number;
  created_at: string;
}

interface PortfolioDetail {
  id: number;
  name: string;
  portfolio_type: string;
  created_at: string;
  updated_at: string;
  targets: Target[];
  holdings: HoldingWithValue[];
  total_value: number | null;
  total_invested: number | null;
  total_profit_loss: number | null;
}

const CHART_COLORS = [
  'hsl(221.2, 83.2%, 53.3%)',
  'hsl(262.1, 83.3%, 57.8%)',
  'hsl(142.1, 76.2%, 36.3%)',
  'hsl(38.3, 95.7%, 53.1%)',
  'hsl(346.8, 77.2%, 49.8%)',
  'hsl(199.4, 95.5%, 53.8%)',
];

// Generate sample chart data for portfolio value over time
function generateChartData(totalValue: number | null): AreaData<Time>[] {
  if (totalValue === null || totalValue === 0) return [];

  const data: AreaData<Time>[] = [];
  const now = new Date();
  const baseValue = totalValue * 0.85;

  for (let i = 90; i >= 0; i--) {
    const date = new Date(now);
    date.setDate(date.getDate() - i);
    const dateStr = date.toISOString().split('T')[0];

    // Simulate value fluctuation
    const progress = (90 - i) / 90;
    const fluctuation = Math.sin(i * 0.1) * 0.05;
    const value = baseValue + (totalValue - baseValue) * progress * (1 + fluctuation);

    data.push({
      time: dateStr as Time,
      value: Math.round(value),
    });
  }

  return data;
}

export default function PortfolioDetailPage() {
  const router = useRouter();
  const params = useParams();
  const portfolioId = params.id as string;

  const [loading, setLoading] = useState(true);
  const [portfolio, setPortfolio] = useState<PortfolioDetail | null>(null);
  const [transactions, setTransactions] = useState<Transaction[]>([]);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    const init = async () => {
      try {
        await api.getCurrentUser();
        await Promise.all([fetchPortfolio(), fetchTransactions()]);
      } catch {
        router.push('/login');
      } finally {
        setLoading(false);
      }
    };
    init();
  }, [router, portfolioId]);

  const fetchPortfolio = async () => {
    try {
      setError(null);
      const data = await api.get<PortfolioDetail>(`/api/portfolios/${portfolioId}/detail`);
      setPortfolio(data);
    } catch (err) {
      const message = err instanceof Error ? err.message : 'Failed to fetch portfolio';
      setError(message);
    }
  };

  const fetchTransactions = async () => {
    try {
      const data = await api.get<Transaction[]>(`/api/portfolios/${portfolioId}/transactions`);
      setTransactions(data);
    } catch {
      // Transactions may not exist yet
      setTransactions([]);
    }
  };

  const formatCurrency = (value: number | null) => {
    if (value === null) return '-';
    return new Intl.NumberFormat('ko-KR', {
      style: 'currency',
      currency: 'KRW',
      maximumFractionDigits: 0,
    }).format(value);
  };

  const formatPercent = (value: number | null) => {
    if (value === null) return '-';
    return `${value >= 0 ? '+' : ''}${value.toFixed(2)}%`;
  };

  const calculateReturnPercent = (): number | null => {
    if (
      !portfolio ||
      portfolio.total_profit_loss === null ||
      portfolio.total_invested === null ||
      portfolio.total_invested === 0
    ) {
      return null;
    }
    return (portfolio.total_profit_loss / portfolio.total_invested) * 100;
  };

  const getDonutData = () => {
    if (!portfolio) return [];
    return portfolio.holdings
      .filter((h) => h.current_ratio !== null && h.current_ratio > 0)
      .map((h, index) => ({
        name: h.ticker,
        value: h.current_ratio ?? 0,
        color: CHART_COLORS[index % CHART_COLORS.length],
      }));
  };

  if (loading) {
    return null;
  }

  const chartData = portfolio ? generateChartData(portfolio.total_value) : [];
  const returnPercent = calculateReturnPercent();

  return (
    <DashboardLayout>
      {error && (
        <div className="bg-destructive/10 border border-destructive text-destructive px-4 py-3 rounded mb-4">
          {error}
        </div>
      )}

      {portfolio && (
        <>
          <div className="flex justify-between items-center mb-6">
            <div>
              <h1 className="text-2xl font-bold text-foreground">{portfolio.name}</h1>
              <span
                className={`text-xs px-2 py-1 rounded ${
                  portfolio.portfolio_type === 'pension'
                    ? 'bg-purple-100 text-purple-800 dark:bg-purple-900 dark:text-purple-200'
                    : 'bg-muted text-muted-foreground'
                }`}
              >
                {portfolio.portfolio_type === 'pension' ? '퇴직연금' : '일반'}
              </span>
            </div>
            <Button asChild>
              <Link href={`/portfolio/${portfolioId}/rebalance`}>리밸런싱</Link>
            </Button>
          </div>

          {/* Summary Cards */}
          <div className="grid grid-cols-1 md:grid-cols-4 gap-4 mb-6">
            <Card>
              <CardContent className="pt-6">
                <p className="text-sm text-muted-foreground mb-1">총 평가금액</p>
                <p className="text-2xl font-bold text-foreground">
                  {formatCurrency(portfolio.total_value)}
                </p>
              </CardContent>
            </Card>
            <Card>
              <CardContent className="pt-6">
                <p className="text-sm text-muted-foreground mb-1">총 투자금액</p>
                <p className="text-2xl font-bold text-foreground">
                  {formatCurrency(portfolio.total_invested)}
                </p>
              </CardContent>
            </Card>
            <Card>
              <CardContent className="pt-6">
                <p className="text-sm text-muted-foreground mb-1">총 손익</p>
                <p
                  className={`text-2xl font-bold ${
                    (portfolio.total_profit_loss ?? 0) >= 0 ? 'text-green-600' : 'text-red-600'
                  }`}
                >
                  {formatCurrency(portfolio.total_profit_loss)}
                </p>
              </CardContent>
            </Card>
            <Card>
              <CardContent className="pt-6">
                <p className="text-sm text-muted-foreground mb-1">수익률</p>
                <p
                  className={`text-2xl font-bold ${
                    (returnPercent ?? 0) >= 0 ? 'text-green-600' : 'text-red-600'
                  }`}
                >
                  {formatPercent(returnPercent)}
                </p>
              </CardContent>
            </Card>
          </div>

          {/* Chart Section */}
          {chartData.length > 0 && (
            <Card className="mb-6">
              <CardHeader>
                <CardTitle>포트폴리오 가치 추이</CardTitle>
              </CardHeader>
              <CardContent>
                <TradingViewChart data={chartData} height={300} />
              </CardContent>
            </Card>
          )}

          {/* Tabs Section */}
          <Tabs defaultValue="holdings" className="space-y-4">
            <TabsList>
              <TabsTrigger value="holdings">보유종목</TabsTrigger>
              <TabsTrigger value="transactions">거래내역</TabsTrigger>
              <TabsTrigger value="analysis">분석</TabsTrigger>
            </TabsList>

            {/* Holdings Tab */}
            <TabsContent value="holdings">
              <Card>
                <CardHeader>
                  <CardTitle>보유 자산</CardTitle>
                </CardHeader>
                <CardContent className="p-0">
                  <div className="overflow-x-auto">
                    <table className="w-full">
                      <thead className="bg-muted">
                        <tr>
                          <th
                            scope="col"
                            className="px-4 py-3 text-left text-sm font-medium text-muted-foreground"
                          >
                            종목
                          </th>
                          <th
                            scope="col"
                            className="px-4 py-3 text-right text-sm font-medium text-muted-foreground"
                          >
                            수량
                          </th>
                          <th
                            scope="col"
                            className="px-4 py-3 text-right text-sm font-medium text-muted-foreground"
                          >
                            평균단가
                          </th>
                          <th
                            scope="col"
                            className="px-4 py-3 text-right text-sm font-medium text-muted-foreground"
                          >
                            현재가
                          </th>
                          <th
                            scope="col"
                            className="px-4 py-3 text-right text-sm font-medium text-muted-foreground"
                          >
                            평가금액
                          </th>
                          <th
                            scope="col"
                            className="px-4 py-3 text-left text-sm font-medium text-muted-foreground min-w-[150px]"
                          >
                            비중
                          </th>
                          <th
                            scope="col"
                            className="px-4 py-3 text-right text-sm font-medium text-muted-foreground"
                          >
                            손익률
                          </th>
                        </tr>
                      </thead>
                      <tbody className="divide-y divide-border">
                        {portfolio.holdings.map((holding, index) => (
                          <tr key={holding.ticker}>
                            <td className="px-4 py-3 text-sm font-medium">{holding.ticker}</td>
                            <td className="px-4 py-3 text-sm text-right">
                              {holding.quantity.toLocaleString()}
                            </td>
                            <td className="px-4 py-3 text-sm text-right">
                              {formatCurrency(holding.avg_price)}
                            </td>
                            <td className="px-4 py-3 text-sm text-right">
                              {formatCurrency(holding.current_price)}
                            </td>
                            <td className="px-4 py-3 text-sm text-right">
                              {formatCurrency(holding.value)}
                            </td>
                            <td className="px-4 py-3 text-sm">
                              <div className="flex items-center gap-2">
                                <div className="flex-1 bg-muted rounded-full h-2 overflow-hidden">
                                  <div
                                    className="h-full rounded-full"
                                    style={{
                                      width: `${Math.min(holding.current_ratio ?? 0, 100)}%`,
                                      backgroundColor: CHART_COLORS[index % CHART_COLORS.length],
                                    }}
                                  />
                                </div>
                                <span className="text-xs text-muted-foreground w-12 text-right">
                                  {holding.current_ratio?.toFixed(1)}%
                                </span>
                              </div>
                            </td>
                            <td
                              className={`px-4 py-3 text-sm text-right ${
                                (holding.profit_loss_ratio ?? 0) >= 0
                                  ? 'text-green-600'
                                  : 'text-red-600'
                              }`}
                            >
                              {formatPercent(holding.profit_loss_ratio)}
                            </td>
                          </tr>
                        ))}
                        {portfolio.holdings.length === 0 && (
                          <tr>
                            <td colSpan={7} className="px-4 py-8 text-center text-muted-foreground">
                              보유 자산이 없습니다.
                            </td>
                          </tr>
                        )}
                      </tbody>
                    </table>
                  </div>
                </CardContent>
              </Card>
            </TabsContent>

            {/* Transactions Tab */}
            <TabsContent value="transactions">
              <Card>
                <CardHeader>
                  <CardTitle>거래 내역</CardTitle>
                </CardHeader>
                <CardContent className="p-0">
                  <div className="overflow-x-auto">
                    <table className="w-full">
                      <thead className="bg-muted">
                        <tr>
                          <th
                            scope="col"
                            className="px-4 py-3 text-left text-sm font-medium text-muted-foreground"
                          >
                            일시
                          </th>
                          <th
                            scope="col"
                            className="px-4 py-3 text-left text-sm font-medium text-muted-foreground"
                          >
                            종목
                          </th>
                          <th
                            scope="col"
                            className="px-4 py-3 text-center text-sm font-medium text-muted-foreground"
                          >
                            유형
                          </th>
                          <th
                            scope="col"
                            className="px-4 py-3 text-right text-sm font-medium text-muted-foreground"
                          >
                            수량
                          </th>
                          <th
                            scope="col"
                            className="px-4 py-3 text-right text-sm font-medium text-muted-foreground"
                          >
                            가격
                          </th>
                          <th
                            scope="col"
                            className="px-4 py-3 text-right text-sm font-medium text-muted-foreground"
                          >
                            거래금액
                          </th>
                        </tr>
                      </thead>
                      <tbody className="divide-y divide-border">
                        {transactions.map((tx) => (
                          <tr key={tx.id}>
                            <td className="px-4 py-3 text-sm text-muted-foreground">
                              {new Date(tx.created_at).toLocaleString('ko-KR')}
                            </td>
                            <td className="px-4 py-3 text-sm font-medium">{tx.ticker}</td>
                            <td className="px-4 py-3 text-sm text-center">
                              <span
                                className={`px-2 py-1 rounded text-xs font-medium ${
                                  tx.transaction_type === 'buy'
                                    ? 'bg-red-100 text-red-800 dark:bg-red-900 dark:text-red-200'
                                    : 'bg-blue-100 text-blue-800 dark:bg-blue-900 dark:text-blue-200'
                                }`}
                              >
                                {tx.transaction_type === 'buy' ? '매수' : '매도'}
                              </span>
                            </td>
                            <td className="px-4 py-3 text-sm text-right">
                              {tx.quantity.toLocaleString()}
                            </td>
                            <td className="px-4 py-3 text-sm text-right">
                              {formatCurrency(tx.price)}
                            </td>
                            <td className="px-4 py-3 text-sm text-right">
                              {formatCurrency(tx.quantity * tx.price)}
                            </td>
                          </tr>
                        ))}
                        {transactions.length === 0 && (
                          <tr>
                            <td colSpan={6} className="px-4 py-8 text-center text-muted-foreground">
                              거래 내역이 없습니다.
                            </td>
                          </tr>
                        )}
                      </tbody>
                    </table>
                  </div>
                </CardContent>
              </Card>
            </TabsContent>

            {/* Analysis Tab */}
            <TabsContent value="analysis">
              <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
                {/* Allocation Chart */}
                <Card>
                  <CardHeader>
                    <CardTitle>자산 배분</CardTitle>
                  </CardHeader>
                  <CardContent>
                    <DonutChart data={getDonutData()} height={250} showLegend={true} />
                  </CardContent>
                </Card>

                {/* Target vs Actual */}
                <Card>
                  <CardHeader>
                    <CardTitle>목표 vs 실제 비중</CardTitle>
                  </CardHeader>
                  <CardContent>
                    <div className="space-y-4">
                      {portfolio.targets.map((target, index) => {
                        const holding = portfolio.holdings.find((h) => h.ticker === target.ticker);
                        const actualRatio = holding?.current_ratio ?? 0;
                        const diff = actualRatio - target.target_ratio;

                        return (
                          <div key={target.ticker} className="space-y-2">
                            <div className="flex justify-between text-sm">
                              <span className="font-medium">{target.ticker}</span>
                              <span className="text-muted-foreground">
                                {actualRatio.toFixed(1)}% / {target.target_ratio.toFixed(1)}%
                                <span
                                  className={`ml-2 ${
                                    Math.abs(diff) > 5
                                      ? diff > 0
                                        ? 'text-orange-600'
                                        : 'text-blue-600'
                                      : 'text-green-600'
                                  }`}
                                >
                                  ({diff >= 0 ? '+' : ''}
                                  {diff.toFixed(1)}%)
                                </span>
                              </span>
                            </div>
                            <div className="relative h-4 bg-muted rounded-full overflow-hidden">
                              {/* Target indicator */}
                              <div
                                className="absolute h-full w-0.5 bg-foreground/50 z-10"
                                style={{ left: `${Math.min(target.target_ratio, 100)}%` }}
                              />
                              {/* Actual bar */}
                              <div
                                className="h-full rounded-full"
                                style={{
                                  width: `${Math.min(actualRatio, 100)}%`,
                                  backgroundColor: CHART_COLORS[index % CHART_COLORS.length],
                                }}
                              />
                            </div>
                          </div>
                        );
                      })}
                      {portfolio.targets.length === 0 && (
                        <p className="text-center text-muted-foreground py-8">
                          목표 비중이 설정되지 않았습니다.
                        </p>
                      )}
                    </div>
                  </CardContent>
                </Card>
              </div>
            </TabsContent>
          </Tabs>
        </>
      )}
    </DashboardLayout>
  );
}