import { useEffect, useState, useMemo } from 'react';
import { useTranslation } from 'react-i18next';
import { Card, CardContent } from '@shared/components/ui/card';
import { Badge } from '@shared/components/ui/badge';
import { PageContainer, PageHeader } from '@shared/components/layout';
import { Activity, AlertTriangle, Ship, Eye, Anchor, Radar, Shield, Bell, Clock, Target, ChevronRight } from 'lucide-react';
import type { LucideIcon } from 'lucide-react';
import { AreaChart, PieChart } from '@lib/charts';
import { useKpiStore } from '@stores/kpiStore';
import { useEventStore } from '@stores/eventStore';
import { getHourlyStats, type PredictionStatsHourly } from '@/services/kpi';
import { getKpiUi } from '@shared/constants/kpiUiMap';
import { formatDateTime } from '@shared/utils/dateFormat';
import { getViolationColor, getViolationLabel } from '@shared/constants/violationTypes';
import { type AlertLevel, getAlertLevelLabel, getAlertLevelIntent } from '@shared/constants/alertLevels';
import { useSettingsStore } from '@stores/settingsStore';
import { SystemStatusPanel } from './SystemStatusPanel';

/* SFR-12: 모니터링 및 경보 현황판(대시보드) */

// KPI UI 매핑 (icon, color는 store에 없으므로 라벨 기반 매핑)
// KPI_UI_MAP은 shared/constants/kpiUiMap 공통 모듈 사용
export function MonitoringDashboard() {
  const { t } = useTranslation('dashboard');
  const { t: tc } = useTranslation('common');
  const lang = useSettingsStore((s) => s.language);
  const kpiStore = useKpiStore();
  const eventStore = useEventStore();

  const [hourlyStats, setHourlyStats] = useState<PredictionStatsHourly[]>([]);

  useEffect(() => { if (!kpiStore.loaded) kpiStore.load(); }, [kpiStore.loaded, kpiStore.load]);
  useEffect(() => { if (!eventStore.loaded) eventStore.load(); }, [eventStore.loaded, eventStore.load]);
  useEffect(() => {
    getHourlyStats(24).then(setHourlyStats).catch(() => setHourlyStats([]));
  }, []);

  // 24시간 위험도/경보 추이: hourly stats → 차트 데이터
  const TREND = useMemo(() => hourlyStats.map((h) => {
    const hourLabel = h.statHour ? `${new Date(h.statHour).getHours()}시` : '';
    // 위험도 점수: byRiskLevel 가중합 (CRITICAL=100, HIGH=70, MEDIUM=40, LOW=10) 정규화
    let riskScore = 0;
    let total = 0;
    if (h.byRiskLevel) {
      const weights: Record<string, number> = { CRITICAL: 100, HIGH: 70, MEDIUM: 40, LOW: 10 };
      Object.entries(h.byRiskLevel).forEach(([k, v]) => {
        const cnt = Number(v) || 0;
        riskScore += (weights[k.toUpperCase()] ?? 0) * cnt;
        total += cnt;
      });
    }
    const risk = total > 0 ? Math.round(riskScore / total) : 0;
    return {
      h: hourLabel,
      risk,
      alarms: (h.eventCount ?? 0) + (h.criticalCount ?? 0),
    };
  }), [hourlyStats]);

  // KPI: store metrics + UI 매핑
  const KPI = kpiStore.metrics.map((m) => ({
    label: m.label,
    value: m.value,
    icon: getKpiUi(m.label).icon,
    color: getKpiUi(m.label).color,
  }));

  // PIE: store violationTypes → 공통 카탈로그 기반 라벨/색상
  const PIE = kpiStore.violationTypes.map((v) => ({
    name: getViolationLabel(v.type, tc, lang),
    value: v.pct,
    color: getViolationColor(v.type),
  }));

  // 이벤트: store events → 첫 6개, time은 KST로 포맷
  const EVENTS = eventStore.events.slice(0, 6).map((e) => ({
    time: formatDateTime(e.time),
    level: e.level,
    title: e.title,
    detail: e.detail,
  }));

  return (
    <PageContainer>
      <PageHeader
        icon={Activity}
        iconColor="text-green-400"
        title={t('monitoring.title')}
        description={t('monitoring.desc')}
      />
      {/* 백엔드 + prediction 분석 엔진 시스템 상태 (실시간) */}
      <SystemStatusPanel />

      <div className="flex gap-2">
        {KPI.map(k => (
          <div key={k.label} className="flex-1 flex items-center gap-2 px-3 py-2 rounded-xl border border-border bg-card">
            <div className="p-1.5 rounded-lg" style={{ backgroundColor: `${k.color}15` }}><k.icon className="w-4 h-4" style={{ color: k.color }} /></div>
            <span className="text-lg font-bold text-heading">{k.value}</span>
            <span className="text-[9px] text-hint">{k.label}</span>
          </div>
        ))}
      </div>
      <div className="grid grid-cols-3 gap-3">
        <Card className="col-span-2 bg-surface-raised border-border"><CardContent className="p-4">
          <div className="text-[12px] font-bold text-label mb-3">24시간 위험도·경보 추이</div>
          <AreaChart data={TREND} xKey="h" height={200} series={[{ key: 'risk', name: '위험도', color: '#ef4444' }, { key: 'alarms', name: '경보', color: '#3b82f6' }]} />
        </CardContent></Card>
        <Card><CardContent className="p-4">
          <div className="text-[12px] font-bold text-label mb-3">탐지 유형 분포</div>
          <PieChart data={PIE} height={140} innerRadius={30} outerRadius={55} />
          <div className="space-y-1 mt-2">{PIE.map(d => (
            <div key={d.name} className="flex justify-between text-[10px]"><div className="flex items-center gap-1.5"><div className="w-2 h-2 rounded-full" style={{ backgroundColor: d.color }} /><span className="text-muted-foreground">{d.name}</span></div><span className="text-heading font-bold">{d.value}%</span></div>
          ))}</div>
        </CardContent></Card>
      </div>
      <Card><CardContent className="p-4">
        <div className="text-[12px] font-bold text-label mb-3 flex items-center gap-1.5"><Bell className="w-4 h-4 text-red-400" />실시간 이벤트 타임라인</div>
        <div className="space-y-2">
          {EVENTS.map((e, i) => (
            <div key={i} className="flex items-center gap-3 px-3 py-2 bg-surface-overlay rounded-lg">
              <span className="text-[10px] text-hint font-mono whitespace-nowrap shrink-0">{e.time}</span>
              <Badge intent={getAlertLevelIntent(e.level)} size="sm" className="min-w-[52px]">
                {getAlertLevelLabel(e.level, tc, lang)}
              </Badge>
              <span className="text-[11px] text-heading font-medium flex-1">{e.title}</span>
              <span className="text-[10px] text-hint">{e.detail}</span>
            </div>
          ))}
        </div>
      </CardContent></Card>
    </PageContainer>
  );
}