import { useCallback, useEffect, type MutableRefObject } from 'react';
import type maplibregl from 'maplibre-gl';
import type { GeoJSONSource, GeoJSONSourceSpecification, LayerSpecification } from 'maplibre-gl';
import type { FcLink, FleetCircle } from '../../../features/legacyDashboard/model/types';
import type { MapToggleState } from '../../../features/mapToggles/MapToggles';
import type { DashSeg, MapProjectionId } from '../types';
import {
  FC_LINE_NORMAL_ML, FC_LINE_SUSPICIOUS_ML,
  FC_LINE_NORMAL_ML_HL, FC_LINE_SUSPICIOUS_ML_HL,
  FLEET_FILL_ML_HL,
  FLEET_LINE_ML, FLEET_LINE_ML_HL,
} from '../constants';
import { makeUniqueSorted } from '../lib/setUtils';
import {
  makeFcSegmentFeatureId,
  makeFleetCircleFeatureId,
} from '../lib/featureIds';
import {
  makeMmsiAnyEndpointExpr,
  makeFleetOwnerMatchExpr,
  makeFleetMemberMatchExpr,
} from '../lib/mlExpressions';
import { kickRepaint, onMapStyleReady } from '../lib/mapCore';
import { circleRingLngLat } from '../lib/geometry';
import { guardedSetVisibility } from '../lib/layerHelpers';
import { dashifyLine } from '../lib/dashifyLine';

/** Globe FC lines + fleet circles 오버레이 */
export function useGlobeFcFleetOverlay(
  mapRef: MutableRefObject<maplibregl.Map | null>,
  projectionBusyRef: MutableRefObject<boolean>,
  reorderGlobeFeatureLayers: () => void,
  opts: {
    overlays: MapToggleState;
    fcLinks: FcLink[] | undefined;
    fleetCircles: FleetCircle[] | undefined;
    projection: MapProjectionId;
    mapSyncEpoch: number;
    hoveredFleetMmsiList: number[];
    hoveredFleetOwnerKeyList: string[];
    hoveredPairMmsiList: number[];
  },
) {
  const {
    overlays, fcLinks, fleetCircles, projection, mapSyncEpoch,
    hoveredFleetMmsiList, hoveredFleetOwnerKeyList, hoveredPairMmsiList,
  } = opts;

  // FC lines
  useEffect(() => {
    const map = mapRef.current;
    if (!map) return;

    const srcId = 'fc-lines-ml-src';
    const layerId = 'fc-lines-ml';

    const remove = () => {
      guardedSetVisibility(map, layerId, 'none');
    };

    const ensure = () => {
      if (projectionBusyRef.current) return;
      if (!map.isStyleLoaded()) return;
      const fleetAwarePairMmsiList = makeUniqueSorted([...hoveredPairMmsiList, ...hoveredFleetMmsiList]);
      const fcHoverActive = fleetAwarePairMmsiList.length > 0;
      if (projection !== 'globe' || (!overlays.fcLines && !fcHoverActive)) {
        remove();
        return;
      }

      const segs: DashSeg[] = [];
      for (const l of fcLinks || []) {
        segs.push(...dashifyLine(l.from, l.to, l.suspicious, l.distanceNm, l.fcMmsi, l.otherMmsi));
      }
      if (segs.length === 0) {
        remove();
        return;
      }

      const fc: GeoJSON.FeatureCollection<GeoJSON.LineString> = {
        type: 'FeatureCollection',
        features: segs.map((s, idx) => ({
          type: 'Feature',
          id: makeFcSegmentFeatureId(s.fromMmsi ?? -1, s.toMmsi ?? -1, idx),
          geometry: { type: 'LineString', coordinates: [s.from, s.to] },
            properties: {
              type: 'fc',
              suspicious: s.suspicious,
              distanceNm: s.distanceNm,
              fcMmsi: s.fromMmsi ?? -1,
              otherMmsi: s.toMmsi ?? -1,
            },
        })),
      };

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

      if (!map.getLayer(layerId)) {
        try {
          map.addLayer(
            {
              id: layerId,
              type: 'line',
              source: srcId,
              layout: { 'line-cap': 'round', 'line-join': 'round', visibility: 'visible' },
              paint: {
                'line-color': [
                  'case',
                  ['==', ['get', 'highlighted'], 1],
                  ['case', ['boolean', ['get', 'suspicious'], false], FC_LINE_SUSPICIOUS_ML_HL, FC_LINE_NORMAL_ML_HL],
                  ['boolean', ['get', 'suspicious'], false],
                  FC_LINE_SUSPICIOUS_ML,
                  FC_LINE_NORMAL_ML,
                ] as never,
                'line-width': ['case', ['==', ['get', 'highlighted'], 1], 2.0, 1.3] as never,
                'line-opacity': 0.9,
              },
        } as unknown as LayerSpecification,
            undefined,
          );
        } catch (e) {
          console.warn('FC lines layer add failed:', e);
        }
      } else {
        guardedSetVisibility(map, layerId, 'visible');
      }

      reorderGlobeFeatureLayers();
      kickRepaint(map);
    };

    const stop = onMapStyleReady(map, ensure);
    ensure();
    return () => {
      stop();
    };
  }, [
    projection,
    overlays.fcLines,
    fcLinks,
    hoveredPairMmsiList,
    hoveredFleetMmsiList,
    mapSyncEpoch,
    reorderGlobeFeatureLayers,
  ]);

  // Fleet circles
  useEffect(() => {
    const map = mapRef.current;
    if (!map) return;

    const srcId = 'fleet-circles-ml-src';
    const fillSrcId = 'fleet-circles-ml-fill-src';
    const layerId = 'fleet-circles-ml';
    const fillLayerId = 'fleet-circles-ml-fill';

    const remove = () => {
      guardedSetVisibility(map, layerId, 'none');
      guardedSetVisibility(map, fillLayerId, 'none');
    };

    const ensure = () => {
      if (projectionBusyRef.current) return;
      if (!map.isStyleLoaded()) return;
      const fleetHoverActive = hoveredFleetOwnerKeyList.length > 0 || hoveredFleetMmsiList.length > 0;
      if (projection !== 'globe' || (!overlays.fleetCircles && !fleetHoverActive) || (fleetCircles?.length ?? 0) === 0) {
        remove();
        return;
      }

      const circles = fleetCircles || [];
      const isHighlightedFleet = (ownerKey: string, vesselMmsis: number[]) =>
        hoveredFleetOwnerKeyList.includes(ownerKey) ||
        (hoveredFleetMmsiList.length > 0 && vesselMmsis.some((mmsi) => hoveredFleetMmsiList.includes(mmsi)));

      const fcLine: GeoJSON.FeatureCollection<GeoJSON.LineString> = {
        type: 'FeatureCollection',
        features: circles.map((c) => {
          const ring = circleRingLngLat(c.center, c.radiusNm * 1852);
          return {
            type: 'Feature',
            id: makeFleetCircleFeatureId(c.ownerKey),
            geometry: { type: 'LineString', coordinates: ring },
            properties: {
              type: 'fleet',
              ownerKey: c.ownerKey,
              ownerLabel: c.ownerLabel,
              count: c.count,
              vesselMmsis: c.vesselMmsis,
              highlighted: 0,
            },
          };
        }),
      };

      const fcFill: GeoJSON.FeatureCollection<GeoJSON.Polygon> = {
        type: 'FeatureCollection',
        features: circles
          .filter((c) => isHighlightedFleet(c.ownerKey, c.vesselMmsis))
          .map((c) => ({
            type: 'Feature',
            id: makeFleetCircleFeatureId(`${c.ownerKey}-fill`),
            geometry: {
              type: 'Polygon',
              coordinates: [circleRingLngLat(c.center, c.radiusNm * 1852, 24)],
            },
            properties: {
              ownerKey: c.ownerKey,
            },
          })),
      };

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

      try {
        const existingFill = map.getSource(fillSrcId) as GeoJSONSource | undefined;
        if (existingFill) existingFill.setData(fcFill);
        else map.addSource(fillSrcId, { type: 'geojson', data: fcFill } as GeoJSONSourceSpecification);
      } catch (e) {
        console.warn('Fleet circles fill source setup failed:', e);
      }

      if (!map.getLayer(layerId)) {
        try {
          map.addLayer(
            {
              id: layerId,
              type: 'line',
              source: srcId,
              layout: { 'line-cap': 'round', 'line-join': 'round', visibility: 'visible' },
              paint: {
                'line-color': ['case', ['==', ['get', 'highlighted'], 1], FLEET_LINE_ML_HL, FLEET_LINE_ML] as never,
                'line-width': ['case', ['==', ['get', 'highlighted'], 1], 2, 1.1] as never,
                'line-opacity': 0.85,
              },
            } as unknown as LayerSpecification,
            undefined,
          );
        } catch (e) {
          console.warn('Fleet circles layer add failed:', e);
        }
      } else {
        guardedSetVisibility(map, layerId, 'visible');
      }

      if (!map.getLayer(fillLayerId)) {
        try {
          map.addLayer(
            {
              id: fillLayerId,
              type: 'fill',
              source: fillSrcId,
              layout: { visibility: fcFill.features.length > 0 ? 'visible' : 'none' },
              paint: {
                'fill-color': FLEET_FILL_ML_HL,
              },
            } as unknown as LayerSpecification,
            undefined,
          );
        } catch (e) {
          console.warn('Fleet circles fill layer add failed:', e);
        }
      } else {
        guardedSetVisibility(map, fillLayerId, fcFill.features.length > 0 ? 'visible' : 'none');
      }

      reorderGlobeFeatureLayers();
      kickRepaint(map);
    };

    const stop = onMapStyleReady(map, ensure);
    ensure();
    return () => {
      stop();
    };
  }, [
    projection,
    overlays.fleetCircles,
    fleetCircles,
    hoveredFleetOwnerKeyList,
    hoveredFleetMmsiList,
    mapSyncEpoch,
    reorderGlobeFeatureLayers,
  ]);

  // FC + Fleet paint state updates
  // eslint-disable-next-line react-hooks/preserve-manual-memoization
  const updateFcFleetPaintStates = useCallback(() => {
    if (projection !== 'globe' || projectionBusyRef.current) return;
    const map = mapRef.current;
    if (!map || !map.isStyleLoaded()) return;

    const fleetAwarePairMmsiList = makeUniqueSorted([...hoveredPairMmsiList, ...hoveredFleetMmsiList]);

    const fcEndpointHighlightExpr = fleetAwarePairMmsiList.length > 0
      ? makeMmsiAnyEndpointExpr('fcMmsi', 'otherMmsi', fleetAwarePairMmsiList)
      : false;

    const fleetOwnerMatchExpr =
      hoveredFleetOwnerKeyList.length > 0 ? makeFleetOwnerMatchExpr(hoveredFleetOwnerKeyList) : false;
    const fleetMemberExpr =
      hoveredFleetMmsiList.length > 0 ? makeFleetMemberMatchExpr(hoveredFleetMmsiList) : false;
    const fleetHighlightExpr =
      hoveredFleetOwnerKeyList.length > 0 || hoveredFleetMmsiList.length > 0
        ? (['any', fleetOwnerMatchExpr, fleetMemberExpr] as never)
        : false;

    try {
      if (map.getLayer('fc-lines-ml')) {
        map.setPaintProperty(
          'fc-lines-ml', 'line-color',
          ['case', fcEndpointHighlightExpr, ['case', ['boolean', ['get', 'suspicious'], false], FC_LINE_SUSPICIOUS_ML_HL, FC_LINE_NORMAL_ML_HL], ['boolean', ['get', 'suspicious'], false], FC_LINE_SUSPICIOUS_ML, FC_LINE_NORMAL_ML] as never,
        );
        map.setPaintProperty(
          'fc-lines-ml', 'line-width',
          ['case', fcEndpointHighlightExpr, 2.0, 1.3] as never,
        );
      }
    } catch {
      // ignore
    }

    try {
      if (map.getLayer('fleet-circles-ml')) {
        map.setPaintProperty('fleet-circles-ml', 'line-color', ['case', fleetHighlightExpr, FLEET_LINE_ML_HL, FLEET_LINE_ML] as never);
        map.setPaintProperty('fleet-circles-ml', 'line-width', ['case', fleetHighlightExpr, 2, 1.1] as never);
      }
    } catch {
      // ignore
    }
  }, [projection, hoveredFleetMmsiList, hoveredFleetOwnerKeyList, hoveredPairMmsiList]);

  useEffect(() => {
    const map = mapRef.current;
    if (!map) return;
    const stop = onMapStyleReady(map, updateFcFleetPaintStates);
    updateFcFleetPaintStates();
    return () => {
      stop();
    };
  }, [mapSyncEpoch, hoveredFleetMmsiList, hoveredFleetOwnerKeyList, hoveredPairMmsiList, projection, updateFcFleetPaintStates]);
}