import React, { useMemo } from 'react';
import type { TrendSearchResultDto } from '../../utils/trendSearchApi';
import { formatUpbitKrwPrice } from '../../utils/safeFormat';
import { VirtualScroll } from '../common/VirtualScroll';

interface Props {
  results: TrendSearchResultDto[];
  selectedMarket: string | null;
  onSelect: (row: TrendSearchResultDto) => void;
  loading?: boolean;
  flashMarkets?: Set<string>;
}

function fmtPrice(n: number): string {
  return formatUpbitKrwPrice(n, '-');
}

function fmtPct(n: number): string {
  const sign = n >= 0 ? '+' : '';
  return `${sign}${n.toFixed(1)}%`;
}

function coinLabel(market: string, name?: string): string {
  const code = market.replace(/^KRW-/, '');
  return name ? `${code}/KRW` : `${code}/KRW`;
}

const TrendSearchResultsGrid: React.FC<Props> = ({
  results,
  selectedMarket,
  onSelect,
  loading,
  flashMarkets,
}) => {
  const avgMatch = useMemo(() => {
    if (!results.length) return 0;
    return Math.round(results.reduce((s, r) => s + r.matchRate, 0) / results.length);
  }, [results]);

  const emptyBody = loading && results.length === 0
    ? <div className="tsd-virtual-empty tsd-empty">스캔 중…</div>
    : <div className="tsd-virtual-empty tsd-empty">조건에 맞는 종목이 없습니다. 필터를 조정해 보세요.</div>;

  return (
    <div className="tsd-results">
      <div className="tsd-results-head">
        <div>
          <h3 className="tsd-panel-title">실시간 종목 일치율 그리드</h3>
          <p className="tsd-panel-sub">Search Condition Match Rate % Sorting · 100ms 실시간 처리</p>
        </div>
        <div className="tsd-results-meta">
          <span className="tsd-meta-chip">평균 {avgMatch}%</span>
          <span className="tsd-meta-chip tsd-meta-chip--live">● LIVE</span>
        </div>
      </div>

      <div className="tsd-results-table-wrap tsd-results-table-wrap--virtual">
        <table className="tsd-results-table tsd-results-table--head">
          <thead>
            <tr>
              <th>종목명</th>
              <th>현재가</th>
              <th>전일대비</th>
              <th>일치율</th>
              <th>비고</th>
            </tr>
          </thead>
        </table>
        <VirtualScroll
          className="tsd-virtual-body vl-scroll"
          items={results}
          estimateSize={40}
          getItemKey={row => row.market}
          empty={emptyBody}
          role="rowgroup"
          aria-label="추세검색 결과"
        >
          {row => {
            const up = row.changeRate >= 0;
            const active = selectedMarket === row.market;
            const flash = flashMarkets?.has(row.market);
            return (
              <div
                className={[
                  'tsd-virtual-row',
                  active ? 'tsd-row--sel' : '',
                  flash ? (up ? 'tsd-row--flash-up' : 'tsd-row--flash-down') : '',
                ].filter(Boolean).join(' ')}
                role="row"
                onClick={() => onSelect(row)}
              >
                <div className="tsd-virtual-cell tsd-col-symbol">
                  <span className="tsd-symbol">{coinLabel(row.market, row.koreanName)}</span>
                </div>
                <div className="tsd-virtual-cell tsd-col-price">{fmtPrice(row.currentPrice)}</div>
                <div className={`tsd-virtual-cell tsd-col-change${up ? ' up' : ' down'}`}>{fmtPct(row.changeRate)}</div>
                <div className="tsd-virtual-cell tsd-col-match">
                  <div className="tsd-match-bar-wrap">
                    <div className="tsd-match-bar">
                      <div className="tsd-match-bar-fill" style={{ width: `${row.matchRate}%` }} />
                    </div>
                    <span className="tsd-match-pct">{row.matchRate}%</span>
                  </div>
                </div>
                <div className="tsd-virtual-cell tsd-col-badge">
                  {row.highMatch && <span className="tsd-badge-high">HIGH MATCH</span>}
                  {!row.highMatch && row.matchRate >= 70 && <span className="tsd-badge-mid">MATCH</span>}
                </div>
              </div>
            );
          }}
        </VirtualScroll>
      </div>
    </div>
  );
};

export default TrendSearchResultsGrid;