import { useState, useEffect, useMemo, useCallback, useRef } from 'react';
import { useTranslation } from 'react-i18next';
import type maplibregl from 'maplibre-gl';
import { BaseMap, STATIC_LAYERS, createMarkerLayer, createPolylineLayer, useMapLayers, type MapHandle } from '@lib/map';
import { Card, CardContent } from '@shared/components/ui/card';
import { Badge } from '@shared/components/ui/badge';
import { Button } from '@shared/components/ui/button';
import { PageContainer, PageHeader } from '@shared/components/layout';
import { Navigation, Ship, MapPin, Clock, Wind, Anchor, Play, BarChart3, Target, Settings, CheckCircle, Share2 } from 'lucide-react';
import { usePatrolStore } from '@stores/patrolStore';

/* SFR-07: AI 경비함정 단일 함정 순찰·경로 추천 */

const RANGE_MAP: Record<string, string> = {
  '태극급': '3,500NM',
  '참수리급': '800NM',
  '삼봉급': '5,000NM',
};

const ROUTE_SHIP_IDS = ['P-3001', 'P-3005', 'P-3009', 'P-5001'];


export function PatrolRoute() {
  const { t } = useTranslation('patrol');
  const { ships, routes, scenarios, load } = usePatrolStore();
  useEffect(() => { load(); }, [load]);

  const [selectedShip, setSelectedShip] = useState('P-3001');
  const [selectedScenario, setSelectedScenario] = useState(1);

  const SHIPS = useMemo(
    () =>
      ships
        .filter((s) => ROUTE_SHIP_IDS.includes(s.id))
        .map((s) => ({
          id: s.id,
          name: s.name,
          class: s.shipClass,
          speed: `${s.speed}kt`,
          range: RANGE_MAP[s.shipClass] ?? '-',
          status: ['추적중', '검문중', '초계중'].includes(s.status) ? '출동중' : s.status === '정비중' ? '정비중' : '가용',
        })),
    [ships],
  );

  const mapRef = useRef<MapHandle>(null);
  const route = routes[selectedShip] || routes['P-3001'];
  const currentShip = SHIPS.find(s => s.id === selectedShip) ?? SHIPS[0];

  const wps = route?.waypoints ?? [];

  const buildLayers = useCallback(() => {
    if (wps.length === 0) return [...STATIC_LAYERS];

    const routeCoords: [number, number][] = wps.map(w => [w.lat, w.lng]);
    const midMarkers = [];
    for (let i = 0; i < wps.length - 1; i++) {
      midMarkers.push({
        lat: (wps[i].lat + wps[i + 1].lat) / 2,
        lng: (wps[i].lng + wps[i + 1].lng) / 2,
        color: '#06b6d4',
        radius: 500,
      });
    }
    const waypointMarkers = wps.map((wp, i) => {
      const isStart = i === 0;
      const isEnd = i === wps.length - 1;
      const color = isStart || isEnd ? '#22c55e' : '#06b6d4';
      return { lat: wp.lat, lng: wp.lng, color, radius: isStart || isEnd ? 1400 : 1000, label: `WP${i + 1}` };
    });

    return [
      ...STATIC_LAYERS,
      createPolylineLayer('patrol-route', routeCoords, { color: '#06b6d4', width: 3, opacity: 0.8 }),
      createMarkerLayer('route-midpoints', midMarkers, '#06b6d4', 500),
      createMarkerLayer('waypoint-markers', waypointMarkers),
    ];
  }, [wps]);
  useMapLayers(mapRef, buildLayers, [wps]);

  const handleMapReady = useCallback((map: maplibregl.Map) => {
    if (wps.length === 0) return;
    const lngs = wps.map(w => w.lng);
    const lats = wps.map(w => w.lat);
    map.fitBounds(
      [[Math.min(...lngs), Math.min(...lats)], [Math.max(...lngs), Math.max(...lats)]],
      { padding: 40 },
    );
  }, [wps]);

  const mapCenter: [number, number] = wps.length > 0
    ? [wps.reduce((s, w) => s + w.lat, 0) / wps.length, wps.reduce((s, w) => s + w.lng, 0) / wps.length]
    : [36.0, 126.0];

  if (!currentShip || !route) return null;

  return (
    <PageContainer>
      <PageHeader
        icon={Navigation}
        iconColor="text-cyan-400"
        title={t('patrolRoute.title')}
        description={t('patrolRoute.desc')}
        demo
        actions={
          <>
            <Button variant="primary" size="sm" icon={<Play className="w-3 h-3" />}>
              경로 생성
            </Button>
            <Button variant="secondary" size="sm" icon={<Share2 className="w-3 h-3" />}>
              공유
            </Button>
          </>
        }
      />

      <div className="grid grid-cols-4 gap-3">
        {/* 함정 선택 */}
        <Card>
          <CardContent className="p-4">
            <div className="text-[12px] font-bold text-heading mb-3 flex items-center gap-1.5"><Ship className="w-4 h-4 text-cyan-400" />함정 선택</div>
            <div className="space-y-2">
              {SHIPS.map(s => (
                <div key={s.id} onClick={() => s.status === '가용' && setSelectedShip(s.id)}
                  className={`px-3 py-2 rounded-lg cursor-pointer transition-colors ${selectedShip === s.id ? 'bg-cyan-600/20 border border-cyan-500/30' : 'bg-surface-overlay border border-transparent hover:border-border'} ${s.status !== '가용' ? 'opacity-40 cursor-not-allowed' : ''}`}>
                  <div className="flex justify-between items-center">
                    <span className="text-[11px] font-bold text-heading">{s.name}</span>
                    <Badge intent={s.status === '가용' ? 'success' : 'critical'} size="xs">{s.status}</Badge>
                  </div>
                  <div className="text-[9px] text-hint mt-0.5">{s.class} · {s.speed} · {s.range}</div>
                </div>
              ))}
            </div>
          </CardContent>
        </Card>

        {/* 경로 Waypoint */}
        <Card className="col-span-2 bg-surface-raised border-border">
          <CardContent className="p-4">
            <div className="text-[12px] font-bold text-heading mb-3 flex items-center gap-1.5"><MapPin className="w-4 h-4 text-green-400" />추천 순찰 경로 ({currentShip.name})</div>
            <div className="space-y-1.5">
              {route.waypoints.map((wp, i) => (
                <div key={wp.id} className="flex items-center gap-3 px-3 py-2 bg-surface-overlay rounded-lg">
                  <div className={`w-6 h-6 rounded-full flex items-center justify-center ${i === 0 || i === route.waypoints.length - 1 ? 'bg-green-500/15 border border-green-500/30' : 'bg-cyan-500/15 border border-cyan-500/30'}`}>
                    <span className={`text-[9px] font-bold ${i === 0 || i === route.waypoints.length - 1 ? 'text-green-400' : 'text-cyan-400'}`}>{i + 1}</span>
                  </div>
                  <div className="flex-1">
                    <div className="text-[11px] text-heading font-medium">{wp.name}</div>
                    <div className="text-[9px] text-hint">{wp.lat.toFixed(2)}°N, {wp.lng.toFixed(2)}°E</div>
                  </div>
                  <span className="text-[10px] text-muted-foreground font-mono">ETA {wp.eta}</span>
                </div>
              ))}
            </div>
            <div className="flex gap-4 mt-3 pt-3 border-t border-border text-[10px]">
              {[['총 거리', route.summary.dist], ['예상 시간', route.summary.time], ['연료 소모', route.summary.fuel], ['커버 격자', route.summary.grids]].map(([k, v]) => (
                <div key={k} className="flex-1 text-center"><div className="text-hint">{k}</div><div className="text-heading font-bold">{v}</div></div>
              ))}
            </div>
          </CardContent>
        </Card>

        {/* 시나리오 가중치 */}
        <Card>
          <CardContent className="p-4">
            <div className="text-[12px] font-bold text-heading mb-3 flex items-center gap-1.5"><Settings className="w-4 h-4 text-yellow-400" />시나리오 가중치</div>
            <div className="space-y-2">
              {scenarios.map((sc, i) => (
                <div key={sc.name} onClick={() => setSelectedScenario(i)}
                  className={`px-3 py-2 rounded-lg cursor-pointer ${selectedScenario === i ? 'bg-yellow-500/10 border border-yellow-500/30' : 'bg-surface-overlay border border-transparent'}`}>
                  <div className="flex justify-between">
                    <span className="text-[11px] text-heading font-medium">{sc.name}</span>
                    <span className="text-[10px] text-yellow-400 font-bold">{sc.score}점</span>
                  </div>
                  <div className="flex gap-2 mt-1 text-[9px]">
                    <span className="text-red-400">위험 {sc.weight.risk}%</span>
                    <span className="text-green-400">연료 {sc.weight.fuel}%</span>
                    <span className="text-blue-400">시간 {sc.weight.time}%</span>
                  </div>
                </div>
              ))}
            </div>
            <div className="mt-3 pt-3 border-t border-border">
              <div className="text-[10px] text-muted-foreground mb-1">기존 방식 대비 효율성</div>
              <div className="flex justify-between text-[10px]">
                <span className="text-hint">커버리지</span><span className="text-green-400 font-bold">+32%</span>
              </div>
              <div className="flex justify-between text-[10px]">
                <span className="text-hint">연료 절감</span><span className="text-green-400 font-bold">-18%</span>
              </div>
            </div>
          </CardContent>
        </Card>
      </div>

      {/* 순찰 경로 지도 */}
      <Card>
        <CardContent className="p-0 relative">
          <BaseMap ref={mapRef} key={selectedShip} center={mapCenter} zoom={7} height={480} className="w-full rounded-lg overflow-hidden" onMapReady={handleMapReady} />
          {/* 범례 */}
          <div className="absolute bottom-3 left-3 z-[1000] bg-background/90 backdrop-blur-sm border border-border rounded-lg px-3 py-2">
            <div className="text-[9px] text-muted-foreground font-bold mb-1.5">순찰 경로</div>
            <div className="space-y-1">
              <div className="flex items-center gap-1.5"><div className="w-2.5 h-2.5 rounded-full bg-green-500" /><span className="text-[8px] text-muted-foreground">출발/귀항</span></div>
              <div className="flex items-center gap-1.5"><div className="w-2.5 h-2.5 rounded-full bg-cyan-500" /><span className="text-[8px] text-muted-foreground">경유 초계점</span></div>
              <div className="flex items-center gap-1.5"><div className="w-6 h-0 border-t-2 border-cyan-500" /><span className="text-[8px] text-muted-foreground">순찰 경로</span></div>
            </div>
            <div className="flex items-center gap-3 mt-1.5 pt-1.5 border-t border-border">
              <div className="flex items-center gap-1"><div className="w-3 h-0 border-t border-dashed border-red-500/50" /><span className="text-[7px] text-hint">EEZ</span></div>
              <div className="flex items-center gap-1"><div className="w-3 h-0 border-t border-dashed border-orange-500/60" /><span className="text-[7px] text-hint">NLL</span></div>
            </div>
          </div>
          {/* 함정 정보 */}
          <div className="absolute top-3 left-3 z-[1000] flex items-center gap-2 bg-background/90 backdrop-blur-sm border border-border rounded-lg px-3 py-1.5">
            <Ship className="w-3.5 h-3.5 text-cyan-400" />
            <span className="text-[10px] text-cyan-400 font-bold">{currentShip.name}</span>
            <span className="text-[9px] text-hint">{currentShip.class} · {route.waypoints.length} waypoints · {route.summary.dist}</span>
          </div>
        </CardContent>
      </Card>
    </PageContainer>
  );
}