import { useEffect, useMemo, useRef, type MutableRefObject } from 'react';
import type maplibregl from 'maplibre-gl';
import type { GeoJSONSource, GeoJSONSourceSpecification, LayerSpecification } from 'maplibre-gl';
import type { AisTarget } from '../../../entities/aisTarget/model/types';
import type { LegacyVesselInfo } from '../../../entities/legacyVessel/model/types';
import type { MapToggleState } from '../../../features/mapToggles/MapToggles';
import type { Map3DSettings, MapProjectionId } from '../types';
import {
  ANCHORED_SHIP_ICON_ID,
  GLOBE_ICON_HEADING_OFFSET_DEG,
  GLOBE_OUTLINE_PERMITTED,
  GLOBE_OUTLINE_OTHER,
} from '../constants';
import { isFiniteNumber } from '../lib/setUtils';
import { GLOBE_SHIP_CIRCLE_RADIUS_EXPR } from '../lib/mlExpressions';
import { kickRepaint, onMapStyleReady } from '../lib/mapCore';
import {
  isAnchoredShip,
  getDisplayHeading,
  getGlobeBaseShipColor,
} from '../lib/shipUtils';
import {
  buildFallbackGlobeAnchoredShipIcon,
  ensureFallbackShipImage,
} from '../lib/globeShipIcon';
import { clampNumber } from '../lib/geometry';
import { guardedSetVisibility } from '../lib/layerHelpers';

/** Globe 모드 선박 아이콘 레이어 (halo, outline, symbol, label) */
export function useGlobeShipLayers(
  mapRef: MutableRefObject<maplibregl.Map | null>,
  projectionBusyRef: MutableRefObject<boolean>,
  reorderGlobeFeatureLayers: () => void,
  opts: {
    projection: MapProjectionId;
    settings: Map3DSettings;
    shipData: AisTarget[];
    overlays: MapToggleState;
    legacyHits: Map<number, LegacyVesselInfo> | null | undefined;
    selectedMmsi: number | null;
    isBaseHighlightedMmsi: (mmsi: number) => boolean;
    mapSyncEpoch: number;
    onGlobeShipsReady?: (ready: boolean) => void;
  },
) {
  const {
    projection, settings, shipData, overlays, legacyHits,
    selectedMmsi, isBaseHighlightedMmsi, mapSyncEpoch, onGlobeShipsReady,
  } = opts;

  const epochRef = useRef(-1);

  // Globe GeoJSON을 projection과 무관하게 항상 사전 계산
  // Globe 전환 시 즉시 사용 가능하도록 useMemo로 캐싱
  const globeShipGeoJson = useMemo((): GeoJSON.FeatureCollection<GeoJSON.Point> => {
    return {
      type: 'FeatureCollection',
      features: shipData.map((t) => {
        const legacy = legacyHits?.get(t.mmsi) ?? null;
        const labelName = legacy?.shipNameCn || legacy?.shipNameRoman || t.name || '';
        const heading = getDisplayHeading({
          cog: t.cog,
          heading: t.heading,
          offset: GLOBE_ICON_HEADING_OFFSET_DEG,
        });
        const isAnchored = isAnchoredShip({ sog: t.sog, cog: t.cog, heading: t.heading });
        const shipHeading = isAnchored ? 0 : heading;
        const hull = clampNumber(
          (isFiniteNumber(t.length) ? t.length : 0) + (isFiniteNumber(t.width) ? t.width : 0) * 3,
          50, 420,
        );
        const sizeScale = clampNumber(0.85 + (hull - 50) / 420, 0.82, 1.85);
        const selected = t.mmsi === selectedMmsi;
        const highlighted = isBaseHighlightedMmsi(t.mmsi);
        const selectedScale = selected ? 1.08 : 1;
        const highlightScale = highlighted ? 1.06 : 1;
        const iconScale = selected ? selectedScale : highlightScale;
        const iconSize3 = clampNumber(0.35 * sizeScale * selectedScale, 0.25, 1.3);
        const iconSize7 = clampNumber(0.45 * sizeScale * selectedScale, 0.3, 1.45);
        const iconSize10 = clampNumber(0.58 * sizeScale * selectedScale, 0.35, 1.8);
        const iconSize14 = clampNumber(0.85 * sizeScale * selectedScale, 0.45, 2.6);
        const iconSize18 = clampNumber(2.5 * sizeScale * selectedScale, 1.0, 6.0);
        return {
          type: 'Feature' as const,
          ...(isFiniteNumber(t.mmsi) ? { id: Math.trunc(t.mmsi) } : {}),
          geometry: { type: 'Point' as const, coordinates: [t.lon, t.lat] },
          properties: {
            mmsi: t.mmsi,
            name: t.name || '',
            labelName,
            cog: shipHeading,
            heading: shipHeading,
            sog: isFiniteNumber(t.sog) ? t.sog : 0,
            isAnchored: isAnchored ? 1 : 0,
            shipColor: getGlobeBaseShipColor({
              legacy: legacy?.shipCode || null,
              sog: isFiniteNumber(t.sog) ? t.sog : null,
            }),
            iconSize3: iconSize3 * iconScale,
            iconSize7: iconSize7 * iconScale,
            iconSize10: iconSize10 * iconScale,
            iconSize14: iconSize14 * iconScale,
            iconSize18: iconSize18 * iconScale,
            sizeScale,
            selected: selected ? 1 : 0,
            highlighted: highlighted ? 1 : 0,
            permitted: legacy ? 1 : 0,
            code: legacy?.shipCode || '',
          },
        };
      }),
    };
  }, [shipData, legacyHits, selectedMmsi, isBaseHighlightedMmsi]);

  // Ships in globe mode
  useEffect(() => {
    const map = mapRef.current;
    if (!map) return;

    const imgId = 'ship-globe-icon';
    const anchoredImgId = ANCHORED_SHIP_ICON_ID;
    const srcId = 'ships-globe-src';
    const haloId = 'ships-globe-halo';
    const outlineId = 'ships-globe-outline';
    const symbolLiteId = 'ships-globe-lite';
    const symbolId = 'ships-globe';
    const labelId = 'ships-globe-label';

    // 레이어를 제거하지 않고 visibility만 'none'으로 설정
    // guardedSetVisibility로 현재 값과 동일하면 호출 생략 (style._changed 방지)
    const hide = () => {
      for (const id of [labelId, symbolId, symbolLiteId, outlineId, haloId]) {
        guardedSetVisibility(map, id, 'none');
      }
    };

    const ensureImage = () => {
      ensureFallbackShipImage(map, imgId);
      ensureFallbackShipImage(map, anchoredImgId, buildFallbackGlobeAnchoredShipIcon);
      if (map.hasImage(imgId) && map.hasImage(anchoredImgId)) return;
      kickRepaint(map);
    };

    const ensure = () => {
      if (!settings.showShips) {
        hide();
        onGlobeShipsReady?.(false);
        return;
      }

      // 빠른 visibility 토글 — projectionBusy 중에도 실행
      // guardedSetVisibility로 값이 실제로 바뀔 때만 setLayoutProperty 호출
      // → style._changed 방지 → 불필요한 symbol placement 재계산 방지 → 라벨 사라짐 방지
      const visibility: 'visible' | 'none' = projection === 'globe' ? 'visible' : 'none';
      const labelVisibility: 'visible' | 'none' = projection === 'globe' && overlays.shipLabels ? 'visible' : 'none';
      if (map.getLayer(symbolId) || map.getLayer(symbolLiteId)) {
        const changed =
          map.getLayoutProperty(symbolId, 'visibility') !== visibility ||
          map.getLayoutProperty(symbolLiteId, 'visibility') !== visibility;
        if (changed) {
          for (const id of [haloId, outlineId, symbolLiteId, symbolId]) {
            guardedSetVisibility(map, id, visibility);
          }
          if (projection === 'globe') kickRepaint(map);
        }
        guardedSetVisibility(map, labelId, labelVisibility);
      }

      // 데이터 업데이트는 projectionBusy 중에는 차단
      if (projectionBusyRef.current) {
        // 레이어가 이미 존재하면 ready 상태 유지
        if (map.getLayer(symbolId)) onGlobeShipsReady?.(true);
        return;
      }
      if (!map.isStyleLoaded()) return;

      if (epochRef.current !== mapSyncEpoch) {
        epochRef.current = mapSyncEpoch;
      }

      try {
        ensureImage();
      } catch (e) {
        console.warn('Ship icon image setup failed:', e);
      }

      // 사전 계산된 GeoJSON 사용 (useMemo에서 projection과 무관하게 항상 준비됨)
      const geojson = globeShipGeoJson;

      try {
        const existing = map.getSource(srcId) as GeoJSONSource | undefined;
        if (existing) existing.setData(geojson);
        else map.addSource(srcId, { type: 'geojson', data: geojson } as GeoJSONSourceSpecification);
      } catch (e) {
        console.warn('Ship source setup failed:', e);
        return;
      }

      const before = undefined;
      const priorityFilter = [
        'any',
        ['==', ['to-number', ['get', 'permitted'], 0], 1],
        ['==', ['to-number', ['get', 'selected'], 0], 1],
        ['==', ['to-number', ['get', 'highlighted'], 0], 1],
      ] as unknown as unknown[];
      const nonPriorityFilter = [
        'all',
        ['==', ['to-number', ['get', 'permitted'], 0], 0],
        ['==', ['to-number', ['get', 'selected'], 0], 0],
        ['==', ['to-number', ['get', 'highlighted'], 0], 0],
      ] as unknown as unknown[];

      if (!map.getLayer(haloId)) {
        try {
          map.addLayer(
            {
              id: haloId,
              type: 'circle',
              source: srcId,
              layout: {
                visibility,
                'circle-sort-key': [
                  'case',
                  ['all', ['==', ['get', 'selected'], 1], ['==', ['get', 'permitted'], 1]], 120,
                  ['all', ['==', ['get', 'highlighted'], 1], ['==', ['get', 'permitted'], 1]], 115,
                  ['==', ['get', 'permitted'], 1], 110,
                  ['==', ['get', 'selected'], 1], 60,
                  ['==', ['get', 'highlighted'], 1], 55,
                  20,
                ] as never,
              },
              paint: {
                'circle-radius': GLOBE_SHIP_CIRCLE_RADIUS_EXPR,
                'circle-color': ['coalesce', ['get', 'shipColor'], '#64748b'] as never,
                'circle-opacity': [
                  'case',
                  ['==', ['get', 'selected'], 1], 0.38,
                  ['==', ['get', 'highlighted'], 1], 0.34,
                  0.16,
                ] as never,
              },
            } as unknown as LayerSpecification,
            before,
          );
        } catch (e) {
          console.warn('Ship halo layer add failed:', e);
        }
      }

      if (!map.getLayer(outlineId)) {
        try {
          map.addLayer(
            {
              id: outlineId,
              type: 'circle',
              source: srcId,
              paint: {
                'circle-radius': GLOBE_SHIP_CIRCLE_RADIUS_EXPR,
                'circle-color': 'rgba(0,0,0,0)',
                'circle-stroke-color': [
                  'case',
                  ['==', ['get', 'selected'], 1], 'rgba(14,234,255,0.95)',
                  ['==', ['get', 'highlighted'], 1], 'rgba(245,158,11,0.95)',
                  ['==', ['get', 'permitted'], 1], GLOBE_OUTLINE_PERMITTED,
                  GLOBE_OUTLINE_OTHER,
                ] as never,
                'circle-stroke-width': [
                  'case',
                  ['==', ['get', 'selected'], 1], 3.4,
                  ['==', ['get', 'highlighted'], 1], 2.7,
                  ['==', ['get', 'permitted'], 1], 1.8,
                  0.7,
                ] as never,
                'circle-stroke-opacity': 0.85,
              },
              layout: {
                visibility,
                'circle-sort-key': [
                  'case',
                  ['all', ['==', ['get', 'selected'], 1], ['==', ['get', 'permitted'], 1]], 130,
                  ['all', ['==', ['get', 'highlighted'], 1], ['==', ['get', 'permitted'], 1]], 125,
                  ['==', ['get', 'permitted'], 1], 120,
                  ['==', ['get', 'selected'], 1], 70,
                  ['==', ['get', 'highlighted'], 1], 65,
                  30,
                ] as never,
              },
            } as unknown as LayerSpecification,
            before,
          );
        } catch (e) {
          console.warn('Ship outline layer add failed:', e);
        }
      }

      if (!map.getLayer(symbolLiteId)) {
        try {
          map.addLayer(
            {
              id: symbolLiteId,
              type: 'symbol',
              source: srcId,
              minzoom: 6.5,
              filter: nonPriorityFilter as never,
              layout: {
                visibility,
                'symbol-sort-key': 40 as never,
                'icon-image': [
                  'case',
                  ['==', ['to-number', ['get', 'isAnchored'], 0], 1],
                  anchoredImgId,
                  imgId,
                ] as never,
                'icon-size': [
                  'interpolate',
                  ['linear'],
                  ['zoom'],
                  6.5,
                  ['*', ['to-number', ['get', 'iconSize7'], 0.45], 0.45],
                  8,
                  ['*', ['to-number', ['get', 'iconSize7'], 0.45], 0.62],
                  10,
                  ['*', ['to-number', ['get', 'iconSize10'], 0.58], 0.72],
                  14,
                  ['*', ['to-number', ['get', 'iconSize14'], 0.85], 0.78],
                  18,
                  ['*', ['to-number', ['get', 'iconSize18'], 2.5], 0.78],
                ] as unknown as number[],
                'icon-allow-overlap': true,
                'icon-ignore-placement': true,
                'icon-anchor': 'center',
                'icon-rotate': [
                  'case',
                  ['==', ['to-number', ['get', 'isAnchored'], 0], 1],
                  0,
                  ['to-number', ['get', 'heading'], 0],
                ] as never,
                'icon-rotation-alignment': 'map',
                'icon-pitch-alignment': 'map',
              },
              paint: {
                'icon-color': ['coalesce', ['get', 'shipColor'], '#64748b'] as never,
                'icon-opacity': [
                  'interpolate',
                  ['linear'],
                  ['zoom'],
                  6.5,
                  0.16,
                  8,
                  0.34,
                  11,
                  0.54,
                  14,
                  0.68,
                ] as never,
              },
            } as unknown as LayerSpecification,
            before,
          );
        } catch (e) {
          console.warn('Ship lite symbol layer add failed:', e);
        }
      }

      if (!map.getLayer(symbolId)) {
        try {
          map.addLayer(
            {
              id: symbolId,
              type: 'symbol',
              source: srcId,
              filter: priorityFilter as never,
              layout: {
                visibility,
                'symbol-sort-key': [
                  'case',
                  ['all', ['==', ['get', 'selected'], 1], ['==', ['get', 'permitted'], 1]], 140,
                  ['all', ['==', ['get', 'highlighted'], 1], ['==', ['get', 'permitted'], 1]], 135,
                  ['==', ['get', 'permitted'], 1], 130,
                  ['==', ['get', 'selected'], 1], 80,
                  ['==', ['get', 'highlighted'], 1], 75,
                  45,
                ] as never,
                'icon-image': [
                  'case',
                  ['==', ['to-number', ['get', 'isAnchored'], 0], 1],
                  anchoredImgId,
                  imgId,
                ] as never,
                'icon-size': [
                  'interpolate', ['linear'], ['zoom'],
                  3, ['to-number', ['get', 'iconSize3'], 0.35],
                  7, ['to-number', ['get', 'iconSize7'], 0.45],
                  10, ['to-number', ['get', 'iconSize10'], 0.58],
                  14, ['to-number', ['get', 'iconSize14'], 0.85],
                  18, ['to-number', ['get', 'iconSize18'], 2.5],
                ] as unknown as number[],
                'icon-allow-overlap': true,
                'icon-ignore-placement': true,
                'icon-anchor': 'center',
                'icon-rotate': [
                  'case',
                  ['==', ['to-number', ['get', 'isAnchored'], 0], 1], 0,
                  ['to-number', ['get', 'heading'], 0],
                ] as never,
                'icon-rotation-alignment': 'map',
                'icon-pitch-alignment': 'map',
              },
              paint: {
                'icon-color': ['coalesce', ['get', 'shipColor'], '#64748b'] as never,
                'icon-opacity': [
                  'case',
                  ['==', ['get', 'selected'], 1], 1,
                  ['==', ['get', 'highlighted'], 1], 0.95,
                  ['==', ['get', 'permitted'], 1], 0.93,
                  0.9,
                ] as never,
              },
            } as unknown as LayerSpecification,
            before,
          );
        } catch (e) {
          console.warn('Ship symbol layer add failed:', e);
        }
      }

      const labelFilter = [
        'all',
        ['!=', ['to-string', ['coalesce', ['get', 'labelName'], '']], ''],
        [
          'any',
          ['==', ['get', 'permitted'], 1],
          ['==', ['get', 'selected'], 1],
          ['==', ['get', 'highlighted'], 1],
        ],
      ] as unknown as unknown[];

      if (!map.getLayer(labelId)) {
        try {
          map.addLayer(
            {
              id: labelId,
              type: 'symbol',
              source: srcId,
              minzoom: 7,
              filter: labelFilter as never,
              layout: {
                visibility: labelVisibility,
                'symbol-placement': 'point',
                'text-field': ['get', 'labelName'] as never,
                'text-font': ['Noto Sans Regular', 'Open Sans Regular'],
                'text-size': ['interpolate', ['linear'], ['zoom'], 7, 10, 10, 11, 12, 12, 14, 13] as never,
                'text-anchor': 'top',
                'text-offset': [0, 1.1],
                'text-padding': 2,
                'text-allow-overlap': false,
                'text-ignore-placement': false,
              },
              paint: {
                'text-color': [
                  'case',
                  ['==', ['get', 'selected'], 1], 'rgba(14,234,255,0.95)',
                  ['==', ['get', 'highlighted'], 1], 'rgba(245,158,11,0.95)',
                  'rgba(226,232,240,0.92)',
                ] as never,
                'text-halo-color': 'rgba(2,6,23,0.85)',
                'text-halo-width': 1.2,
                'text-halo-blur': 0.8,
              },
            } as unknown as LayerSpecification,
            undefined,
          );
        } catch (e) {
          console.warn('Ship label layer add failed:', e);
        }
      }

      // 레이어가 준비되었음을 알림 (projection과 무관 — 토글 버튼 활성화용)
      onGlobeShipsReady?.(true);
      if (projection === 'globe') {
        reorderGlobeFeatureLayers();
      }
      kickRepaint(map);
    };

    const stop = onMapStyleReady(map, ensure);
    return () => {
      stop();
    };
  }, [
    projection,
    settings.showShips,
    overlays.shipLabels,
    globeShipGeoJson,
    selectedMmsi,
    isBaseHighlightedMmsi,
    mapSyncEpoch,
    reorderGlobeFeatureLayers,
    onGlobeShipsReady,
  ]);
}