/**
 * DarkDetailPanel — Dark Vessel 판정 상세 사이드 패널
 *
 * 테이블 행 클릭 시 우측에 슬라이드 표시.
 * 점수 산출 내역, 선박 정보, GAP 상세, 과거 이력을 종합 표시.
 */
import { useEffect, useState, useMemo, useCallback } from 'react';
import { useNavigate } from 'react-router-dom';
import { Badge } from '@shared/components/ui/badge';
import { Button } from '@shared/components/ui/button';
import { ScoreBreakdown } from '@shared/components/common/ScoreBreakdown';
import { buildScoreBreakdown } from '@shared/constants/darkVesselPatterns';
import { getRiskIntent } from '@shared/constants/statusIntent';
import { getAlertLevelIntent } from '@shared/constants/alertLevels';
import { formatDateTime } from '@shared/utils/dateFormat';
import { getAnalysisHistory, type VesselAnalysis } from '@/services/analysisApi';
import { X, Ship, MapPin, Clock, AlertTriangle, TrendingUp, ExternalLink, ShieldAlert } from 'lucide-react';
import { BarChart as EcBarChart } from '@lib/charts';

interface DarkDetailPanelProps {
  vessel: VesselAnalysis | null;
  onClose: () => void;
}

export function DarkDetailPanel({ vessel, onClose }: DarkDetailPanelProps) {
  const navigate = useNavigate();
  const [history, setHistory] = useState<VesselAnalysis[]>([]);

  const features = vessel?.features ?? {};
  const darkTier = (features.dark_tier as string) ?? 'NONE';
  const darkScore = (features.dark_suspicion_score as number) ?? 0;
  const darkPatterns = (features.dark_patterns as string[]) ?? [];
  const darkHistory7d = (features.dark_history_7d as number) ?? 0;
  const darkHistory24h = (features.dark_history_24h as number) ?? 0;
  const gapStartLat = features.gap_start_lat as number | undefined;
  const gapStartLon = features.gap_start_lon as number | undefined;
  const gapStartSog = features.gap_start_sog as number | undefined;
  const gapStartState = features.gap_start_state as string | undefined;

  // 점수 산출 내역
  const breakdown = useMemo(() => buildScoreBreakdown(darkPatterns), [darkPatterns]);

  // 7일 이력 조회
  const loadHistory = useCallback(async () => {
    if (!vessel?.mmsi) return;
    try {
      const res = await getAnalysisHistory(vessel.mmsi, 168); // 7일
      setHistory(res);
    } catch { setHistory([]); }
  }, [vessel?.mmsi]);

  useEffect(() => { loadHistory(); }, [loadHistory]);

  // 일별 dark 건수 집계 (차트용)
  const dailyDarkData = useMemo(() => {
    const dayMap: Record<string, number> = {};
    for (const h of history) {
      if (!h.isDark) continue;
      const day = (h.analyzedAt ?? '').slice(0, 10);
      if (day) dayMap[day] = (dayMap[day] || 0) + 1;
    }
    return Object.entries(dayMap)
      .sort(([a], [b]) => a.localeCompare(b))
      .map(([day, count]) => ({ name: day.slice(5), value: count }));
  }, [history]);

  if (!vessel) return null;

  return (
    <div className="fixed inset-y-0 right-0 w-[420px] bg-background border-l border-border z-50 overflow-y-auto shadow-2xl">
      {/* 헤더 */}
      <div className="sticky top-0 bg-background/95 backdrop-blur-sm border-b border-border px-4 py-3 flex items-center justify-between z-10">
        <div className="flex items-center gap-2">
          <ShieldAlert className="w-4 h-4 text-red-400" />
          <span className="font-bold text-heading text-sm">판정 상세</span>
          <Badge intent={getAlertLevelIntent(darkTier)} size="sm">{darkTier}</Badge>
          <span className="text-xs font-mono font-bold text-heading">{darkScore}점</span>
        </div>
        <button type="button" onClick={onClose} className="p-1 hover:bg-surface-raised rounded" aria-label="닫기">
          <X className="w-4 h-4 text-hint" />
        </button>
      </div>

      <div className="p-4 space-y-4">
        {/* 선박 기본 정보 */}
        <div className="bg-surface-raised rounded-lg p-3 space-y-2">
          <div className="flex items-center gap-2 text-xs">
            <Ship className="w-3.5 h-3.5 text-cyan-400" />
            <span className="text-label font-medium">선박 정보</span>
          </div>
          <div className="grid grid-cols-2 gap-y-1 text-xs">
            <span className="text-hint">MMSI</span>
            <button type="button" className="text-cyan-400 hover:underline text-right font-mono"
              onClick={() => navigate(`/vessel/${vessel.mmsi}`)}>
              {vessel.mmsi} <ExternalLink className="w-2.5 h-2.5 inline" />
            </button>
            <span className="text-hint">선종</span>
            <span className="text-label text-right">{vessel.vesselType || 'UNKNOWN'}</span>
            <span className="text-hint">국적</span>
            <span className="text-label text-right">{vessel.mmsi?.startsWith('412') ? 'CN (중국)' : vessel.mmsi?.slice(0, 3)}</span>
            <span className="text-hint">해역</span>
            <span className="text-label text-right">{vessel.zoneCode || '-'}</span>
            <span className="text-hint">활동상태</span>
            <span className="text-label text-right">{vessel.activityState || '-'}</span>
            <span className="text-hint">위험도</span>
            <span className="text-right">
              <Badge intent={getRiskIntent(vessel.riskScore ?? 0)} size="sm">
                {vessel.riskLevel} ({vessel.riskScore})
              </Badge>
            </span>
          </div>
        </div>

        {/* 점수 산출 내역 */}
        <div className="bg-surface-raised rounded-lg p-3 space-y-2">
          <div className="flex items-center gap-2 text-xs">
            <AlertTriangle className="w-3.5 h-3.5 text-orange-400" />
            <span className="text-label font-medium">점수 산출 내역</span>
            <span className="text-hint text-[10px]">({breakdown.items.length}개 패턴 적용)</span>
          </div>
          <ScoreBreakdown items={breakdown.items} totalScore={darkScore} />
        </div>

        {/* GAP 상세 */}
        <div className="bg-surface-raised rounded-lg p-3 space-y-2">
          <div className="flex items-center gap-2 text-xs">
            <MapPin className="w-3.5 h-3.5 text-yellow-400" />
            <span className="text-label font-medium">GAP 상세</span>
          </div>
          <div className="grid grid-cols-2 gap-y-1 text-xs">
            <span className="text-hint">GAP 길이</span>
            <span className="text-label text-right font-mono">
              {vessel.gapDurationMin ? `${vessel.gapDurationMin}분 (${(vessel.gapDurationMin / 60).toFixed(1)}h)` : '-'}
            </span>
            <span className="text-hint">시작 위치</span>
            <span className="text-label text-right font-mono text-[10px]">
              {gapStartLat != null ? `${gapStartLat.toFixed(4)}°N ${gapStartLon?.toFixed(4)}°E` : '-'}
            </span>
            <span className="text-hint">시작 SOG</span>
            <span className="text-label text-right font-mono">
              {gapStartSog != null ? `${gapStartSog.toFixed(1)}kn` : '-'}
            </span>
            <span className="text-hint">시작 상태</span>
            <span className="text-label text-right">{gapStartState || '-'}</span>
            <span className="text-hint">분석시각</span>
            <span className="text-label text-right text-[10px]">{formatDateTime(vessel.analyzedAt)}</span>
          </div>
        </div>

        {/* 과거 이력 */}
        <div className="bg-surface-raised rounded-lg p-3 space-y-2">
          <div className="flex items-center gap-2 text-xs">
            <TrendingUp className="w-3.5 h-3.5 text-purple-400" />
            <span className="text-label font-medium">과거 이력 (7일)</span>
          </div>
          <div className="grid grid-cols-2 gap-y-1 text-xs">
            <span className="text-hint">7일 dark 일수</span>
            <span className="text-label text-right font-bold">{darkHistory7d}일</span>
            <span className="text-hint">24시간 dark</span>
            <span className="text-label text-right">{darkHistory24h}일</span>
          </div>
          {dailyDarkData.length > 0 && (
            <div className="h-24 mt-2">
              <EcBarChart
                data={dailyDarkData}
                xKey="name"
                series={[{ key: 'value', name: 'Dark 건수', color: '#ef4444' }]}
                height={96}
              />
            </div>
          )}
          {dailyDarkData.length === 0 && (
            <div className="text-hint text-[10px] text-center py-2">이력 없음</div>
          )}
        </div>

        {/* 액션 버튼 */}
        <div className="flex gap-2">
          <Button variant="outline" size="sm" className="flex-1"
            onClick={() => navigate(`/vessel/${vessel.mmsi}`)}>
            <Ship className="w-3.5 h-3.5 mr-1" /> 선박 상세
          </Button>
          <Button variant="primary" size="sm" className="flex-1"
            onClick={() => { /* TODO: 단속 대상 등록 API 연동 */ }}>
            <Clock className="w-3.5 h-3.5 mr-1" /> 단속 대상 등록
          </Button>
        </div>
      </div>
    </div>
  );
}
