import React, { useState, useEffect } from 'react';
import dynamic from 'next/dynamic';
import { stockApi } from '@/lib/api';
import { List, Database as DBIcon, Layers, Calendar } from 'lucide-react';
import Layout from '@/components/Layout';

const DatabaseStats = dynamic(() => import('@/components/DatabaseStats'), {
  ssr: false,
  loading: () => (
    <div className="animate-pulse space-y-4">
      <div className="h-6 bg-gray-200 rounded w-1/3"></div>
      <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
        <div className="h-32 bg-gray-200 rounded"></div>
        <div className="h-32 bg-gray-200 rounded"></div>
        <div className="h-32 bg-gray-200 rounded"></div>
      </div>
    </div>
  ),
});

const DatabasePage: React.FC = () => {
  const [tab, setTab] = useState<'stats' | 'etf' | 'financial'>('stats');
  const [etf, setEtf] = useState<{loading:boolean; items:any[]; total:number}>({loading:false, items:[], total:0});
  const [fin, setFin] = useState<{loading:boolean; items:any[]; total:number}>({loading:false, items:[], total:0});

  const loadEtf = async () => {
    setEtf(s => ({...s, loading:true}));
    try {
      const res = await stockApi.getEtfSnapshots({ limit: 25 });
      setEtf({loading:false, items:res.results, total:res.count});
    } catch {
      setEtf({loading:false, items:[], total:0});
    }
  };

  const loadFin = async () => {
    setFin(s => ({...s, loading:true}));
    try {
      const res = await stockApi.getFinancialRecords({ limit: 50 });
      setFin({loading:false, items:res.results, total:res.count});
    } catch {
      setFin({loading:false, items:[], total:0});
    }
  };

  useEffect(() => {
    if (tab === 'etf') loadEtf();
    if (tab === 'financial') loadFin();
  }, [tab]);

  return (
    <Layout title="Database - Stock Oracle">
      <div className="mb-6 flex items-center space-x-2">
        <button onClick={() => setTab('stats')} className={`px-3 py-2 rounded-md text-sm ${tab==='stats'?'bg-blue-600 text-white':'bg-gray-100 text-gray-700'}`}>
          개요
        </button>
        <button onClick={() => setTab('etf')} className={`px-3 py-2 rounded-md text-sm ${tab==='etf'?'bg-blue-600 text-white':'bg-gray-100 text-gray-700'}`}>
          ETF 스냅샷
        </button>
        <button onClick={() => setTab('financial')} className={`px-3 py-2 rounded-md text-sm ${tab==='financial'?'bg-blue-600 text-white':'bg-gray-100 text-gray-700'}`}>
          재무 레코드
        </button>
      </div>

      {tab==='stats' && <DatabaseStats />}

      {tab==='etf' && (
        <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-6">
          <h3 className="text-lg font-semibold text-gray-900 mb-4 flex items-center"><Layers className="h-5 w-5 mr-2"/>저장된 ETF 스냅샷</h3>
          {etf.loading ? (
            <p className="text-gray-500">로딩 중...</p>
          ) : etf.items.length===0 ? (
            <p className="text-gray-500">저장된 스냅샷이 없습니다.</p>
          ) : (
            <div className="overflow-x-auto">
              <table className="min-w-full text-sm text-gray-900">
                <thead>
                  <tr className="text-left text-gray-800 border-b">
                    <th className="py-2 pr-4">Snapshot ID</th>
                    <th className="py-2 pr-4">Ticker</th>
                    <th className="py-2 pr-4">Date</th>
                    <th className="py-2 pr-4">Source</th>
                    <th className="py-2 pr-4">Holdings</th>
                  </tr>
                </thead>
                <tbody>
                  {etf.items.map((s:any) => (
                    <tr key={s.id} className="border-b hover:bg-gray-50 text-gray-900">
                      <td className="py-2 pr-4 font-mono text-xs break-all">{s.id}</td>
                      <td className="py-2 pr-4">{s.ticker}</td>
                      <td className="py-2 pr-4 flex items-center"><Calendar className="h-4 w-4 mr-1"/>{new Date(s.snapshot_date).toLocaleDateString('ko-KR')}</td>
                      <td className="py-2 pr-4">{s.source || '-'}</td>
                      <td className="py-2 pr-4">{s.holdings_count}</td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          )}
        </div>
      )}

      {tab==='financial' && (
        <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-6">
          <h3 className="text-lg font-semibold text-gray-900 mb-4 flex items-center"><DBIcon className="h-5 w-5 mr-2"/>저장된 재무 레코드</h3>
          {fin.loading ? (
            <p className="text-gray-500">로딩 중...</p>
          ) : fin.items.length===0 ? (
            <p className="text-gray-500">레코드가 없습니다.</p>
          ) : (
            <div className="overflow-x-auto">
              <table className="min-w-full text-sm text-gray-900">
                <thead>
                  <tr className="text-left text-gray-800 border-b">
                    <th className="py-2 pr-4">Ticker</th>
                    <th className="py-2 pr-4">Period</th>
                    <th className="py-2 pr-4">Type</th>
                    <th className="py-2 pr-4">Revenue</th>
                    <th className="py-2 pr-4">Net Income</th>
                    <th className="py-2 pr-4">Source</th>
                  </tr>
                </thead>
                <tbody>
                  {fin.items.map((r:any) => (
                    <tr key={`${r.ticker}-${r.period_date}-${r.period_type}`} className="border-b hover:bg-gray-50 text-gray-900">
                      <td className="py-2 pr-4">{r.ticker}</td>
                      <td className="py-2 pr-4">{new Date(r.period_date).toLocaleDateString('ko-KR')}</td>
                      <td className="py-2 pr-4">{r.period_type}</td>
                      <td className="py-2 pr-4">{r.revenue?.toLocaleString() ?? '-'}</td>
                      <td className="py-2 pr-4">{r.net_income?.toLocaleString() ?? '-'}</td>
                      <td className="py-2 pr-4">{r.data_source}</td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          )}
        </div>
      )}
    </Layout>
  );
};

export default DatabasePage;