/**
 * 선박 24h 특이운항 판별 구간 상세 패널.
 * 연속된 동일 카테고리 신호는 1개 구간으로 병합하여 시작~종료 시각과 함께 표시한다.
 */
import { Loader2, AlertTriangle, ShieldAlert } from 'lucide-react';
import { Card, CardContent } from '@shared/components/ui/card';
import { Badge } from '@shared/components/ui/badge';
import { formatDateTime } from '@shared/utils/dateFormat';
import {
  type AnomalySegment,
  getAnomalyCategoryIntent,
  getAnomalyCategoryLabel,
} from './vesselAnomaly';

interface Props {
  segments: AnomalySegment[];
  loading?: boolean;
  error?: string;
  totalHistoryCount: number;
}

function formatDuration(min: number): string {
  if (min <= 0) return '단일 샘플';
  if (min < 60) return `${min}분`;
  const h = Math.floor(min / 60);
  const m = min % 60;
  return m === 0 ? `${h}시간` : `${h}시간 ${m}분`;
}

export function VesselAnomalyPanel({ segments, loading, error, totalHistoryCount }: Props) {
  const criticalCount = segments.filter((s) => s.severity === 'critical').length;
  const warningCount = segments.filter((s) => s.severity === 'warning').length;
  const infoCount = segments.filter((s) => s.severity === 'info').length;
  const totalSamples = segments.reduce((sum, s) => sum + s.pointCount, 0);

  return (
    <Card className="bg-surface-raised border-slate-700/30">
      <CardContent className="p-3 space-y-2">
        <div className="flex items-center justify-between gap-2 flex-wrap">
          <div className="flex items-center gap-2 flex-wrap">
            <ShieldAlert className="w-3.5 h-3.5 text-red-600 dark:text-red-400" />
            <span className="text-[11px] font-bold text-heading">특이운항 판별 구간</span>
            {segments.length > 0 && (
              <span className="text-[10px] text-hint flex items-center gap-1 flex-wrap">
                · {segments.length}구간
                {criticalCount > 0 && <span className="text-red-600 dark:text-red-400 ml-0.5">CRITICAL {criticalCount}</span>}
                {warningCount > 0 && <span className="text-orange-600 dark:text-orange-400 ml-0.5">WARNING {warningCount}</span>}
                {infoCount > 0 && <span className="text-blue-600 dark:text-blue-400 ml-0.5">INFO {infoCount}</span>}
              </span>
            )}
          </div>
          <span className="text-[9px] text-hint">
            최근 24h 분석 {totalHistoryCount}건 중 {totalSamples}건 포함
          </span>
        </div>

        {error && (
          <div className="flex items-center gap-2 px-2 py-1.5 rounded border border-red-500/30 bg-red-500/5 text-[10px] text-red-600 dark:text-red-400">
            <AlertTriangle className="w-3 h-3 shrink-0" />
            <span>{error}</span>
          </div>
        )}

        {loading && (
          <div className="flex items-center justify-center py-6 text-muted-foreground">
            <Loader2 className="w-4 h-4 animate-spin" />
          </div>
        )}

        {!loading && !error && segments.length === 0 && totalHistoryCount > 0 && (
          <div className="px-3 py-6 text-center text-[11px] text-hint">
            최근 24h 동안 Dark / Spoofing / 환적 / 어구위반 / 고위험 신호가 없습니다.
          </div>
        )}

        {!loading && !error && totalHistoryCount === 0 && (
          <div className="px-3 py-6 text-center text-[11px] text-hint">
            분석 이력이 없습니다.
          </div>
        )}

        {!loading && segments.length > 0 && (
          <div className="max-h-[360px] overflow-y-auto space-y-1.5 pr-1">
            {segments.map((s) => (
              <div
                key={s.id}
                className={`rounded border px-2.5 py-2 text-[10px] ${
                  s.severity === 'critical'
                    ? 'border-red-500/30 bg-red-500/5'
                    : s.severity === 'warning'
                      ? 'border-orange-500/30 bg-orange-500/5'
                      : 'border-blue-500/30 bg-blue-500/5'
                }`}
              >
                <div className="flex items-center justify-between gap-2 mb-1 flex-wrap">
                  <span className="font-mono text-label">
                    {formatDateTime(s.startTime)}
                    {s.startTime !== s.endTime && (
                      <>
                        <span className="text-hint mx-1">→</span>
                        {formatDateTime(s.endTime)}
                      </>
                    )}
                  </span>
                  <span className="text-hint text-[9px]">
                    <span className="text-muted-foreground">{formatDuration(s.durationMin)}</span>
                    <span className="mx-1">·</span>
                    <span>{s.pointCount}회 연속 감지</span>
                    {s.representativeLat != null && s.representativeLon != null && (
                      <>
                        <span className="mx-1">·</span>
                        <span
                          className="font-mono"
                          title="판별 근거가 된 이벤트 발생 지점 (예: AIS 신호 단절 시작 좌표). 실제 분석 시각 위치는 지도의 색칠 궤적 구간을 확인하세요."
                        >
                          {s.representativeLat.toFixed(3)}°N, {s.representativeLon.toFixed(3)}°E
                        </span>
                        <span className="text-muted-foreground ml-0.5">(이벤트 기준)</span>
                      </>
                    )}
                  </span>
                </div>
                <div className="flex items-center gap-1 flex-wrap mb-1">
                  {s.categories.map((c) => (
                    <Badge key={c} intent={getAnomalyCategoryIntent(c)} size="xs" className="font-normal">
                      {getAnomalyCategoryLabel(c)}
                    </Badge>
                  ))}
                </div>
                <div className="text-muted-foreground text-[10px] leading-snug">{s.description}</div>
              </div>
            ))}
          </div>
        )}
      </CardContent>
    </Card>
  );
}