import { useCallback, useEffect, useRef, type MutableRefObject, type Dispatch, type SetStateAction } from 'react';
import maplibregl, { type StyleSpecification } from 'maplibre-gl';
import { MapboxOverlay } from '@deck.gl/mapbox';
import { MaplibreDeckCustomLayer } from '../MaplibreDeckCustomLayer';
import type { BaseMapId, MapProjectionId } from '../types';
import { DECK_VIEW_ID } from '../constants';
import { kickRepaint, onMapStyleReady } from '../lib/mapCore';
import { ensureSeamarkOverlay } from '../layers/seamark';
import { resolveMapStyle } from '../layers/bathymetry';
import { clearGlobeNativeLayers } from '../lib/layerHelpers';

export function useMapInit(
  containerRef: MutableRefObject<HTMLDivElement | null>,
  mapRef: MutableRefObject<maplibregl.Map | null>,
  overlayRef: MutableRefObject<MapboxOverlay | null>,
  overlayInteractionRef: MutableRefObject<MapboxOverlay | null>,
  globeDeckLayerRef: MutableRefObject<MaplibreDeckCustomLayer | null>,
  baseMapRef: MutableRefObject<BaseMapId>,
  projectionRef: MutableRefObject<MapProjectionId>,
  opts: {
    baseMap: BaseMapId;
    projection: MapProjectionId;
    showSeamark: boolean;
    onViewBboxChange?: (bbox: [number, number, number, number]) => void;
    setMapSyncEpoch: Dispatch<SetStateAction<number>>;
  },
) {
  const { onViewBboxChange, setMapSyncEpoch, showSeamark } = opts;
  const showSeamarkRef = useRef(showSeamark);
  useEffect(() => {
    showSeamarkRef.current = showSeamark;
  }, [showSeamark]);

  const ensureMercatorOverlay = useCallback(() => {
    const map = mapRef.current;
    if (!map) return null;
    if (overlayRef.current) return overlayRef.current;
    try {
      const next = new MapboxOverlay({ interleaved: true, layers: [] } as unknown as never);
      map.addControl(next);
      overlayRef.current = next;
      return next;
    } catch (e) {
      console.warn('Deck overlay create failed:', e);
      return null;
    }
  }, []);

  const clearGlobeNativeLayersCb = useCallback(() => {
    const map = mapRef.current;
    if (!map) return;
    clearGlobeNativeLayers(map);
  }, []);

  const pulseMapSync = useCallback(() => {
    setMapSyncEpoch((prev) => prev + 1);
    requestAnimationFrame(() => {
      kickRepaint(mapRef.current);
      setMapSyncEpoch((prev) => prev + 1);
    });
  }, [setMapSyncEpoch]);

  useEffect(() => {
    if (!containerRef.current || mapRef.current) return;

    let map: maplibregl.Map | null = null;
    let cancelled = false;
    const controller = new AbortController();

    (async () => {
      let style: string | StyleSpecification = '/map/styles/osm-seamark.json';
      try {
        style = await resolveMapStyle(baseMapRef.current, controller.signal);
      } catch (e) {
        console.warn('Map style init failed, falling back to local raster style:', e);
        style = '/map/styles/osm-seamark.json';
      }
      if (cancelled || !containerRef.current) return;

      map = new maplibregl.Map({
        container: containerRef.current,
        style,
        center: [126.5, 34.2],
        zoom: 7,
        pitch: 45,
        bearing: 0,
        maxPitch: 85,
        dragRotate: true,
        pitchWithRotate: true,
        touchPitch: true,
        scrollZoom: { around: 'center' },
      });

      map.addControl(new maplibregl.NavigationControl({ showZoom: true, showCompass: true }), 'top-left');
      map.addControl(new maplibregl.ScaleControl({ maxWidth: 120, unit: 'metric' }), 'bottom-left');

      mapRef.current = map;

      if (projectionRef.current === 'mercator') {
        const overlay = ensureMercatorOverlay();
        if (!overlay) return;
        overlayRef.current = overlay;
      } else {
        globeDeckLayerRef.current = new MaplibreDeckCustomLayer({
          id: 'deck-globe',
          viewId: DECK_VIEW_ID,
          deckProps: { layers: [] },
        });
      }

      function applyProjection() {
        if (!map) return;
        const next = projectionRef.current;
        if (next === 'mercator') return;
        try {
          map.setProjection({ type: next });
          map.setRenderWorldCopies(next !== 'globe');
        } catch (e) {
          console.warn('Projection apply failed:', e);
        }
      }

      onMapStyleReady(map, () => {
        applyProjection();
        const deckLayer = globeDeckLayerRef.current;
        if (projectionRef.current === 'globe' && deckLayer && !map!.getLayer(deckLayer.id)) {
          try {
            map!.addLayer(deckLayer);
          } catch {
            // ignore
          }
        }
        if (!showSeamarkRef.current) return;
        try {
          ensureSeamarkOverlay(map!, 'bathymetry-lines');
        } catch {
          // ignore
        }
      });

      const emitBbox = () => {
        const cb = onViewBboxChange;
        if (!cb || !map) return;
        const b = map.getBounds();
        cb([b.getWest(), b.getSouth(), b.getEast(), b.getNorth()]);
      };
      map.on('load', emitBbox);
      map.on('moveend', emitBbox);

      map.once('load', () => {
        if (showSeamarkRef.current) {
          try {
            ensureSeamarkOverlay(map!, 'bathymetry-lines');
          } catch {
            // ignore
          }
          try {
            const opacity = showSeamarkRef.current ? 0.85 : 0;
            map!.setPaintProperty('seamark', 'raster-opacity', opacity);
          } catch {
            // ignore
          }
        }
      });
    })();

    return () => {
      cancelled = true;
      controller.abort();

      try {
        globeDeckLayerRef.current?.requestFinalize();
      } catch {
        // ignore
      }

      if (map) {
        map.remove();
        map = null;
      }
      if (overlayRef.current) {
        overlayRef.current.finalize();
        overlayRef.current = null;
      }
      if (overlayInteractionRef.current) {
        overlayInteractionRef.current.finalize();
        overlayInteractionRef.current = null;
      }
      globeDeckLayerRef.current = null;
      mapRef.current = null;
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  return { ensureMercatorOverlay, clearGlobeNativeLayers: clearGlobeNativeLayersCb, pulseMapSync };
}