import { useCallback, useEffect } from 'react';
import { useDispatch, useSelector } from 'react-redux';

import { map } from './Map';
import { getStatusColor } from '../common/formatter';
import { devicesActions } from '../store';

const PositionsMap = ({ positions }) => {
  const id = 'positions';
  const clusters = `${id}-clusters`;

  const dispatch = useDispatch();
  const devices = useSelector((state) => state.devices.items);

  const createFeature = (devices, position) => {
    const device = devices[position.deviceId];
    return {
      deviceId: position.deviceId,
      name: device.name,
      category: device.category || 'default',
      color: getStatusColor(device.status),
    };
  };

  const onMouseEnter = () => map.getCanvas().style.cursor = 'pointer';
  const onMouseLeave = () => map.getCanvas().style.cursor = '';

  const onMarkerClick = useCallback((event) => {
    const feature = event.features[0];
    dispatch(devicesActions.select(feature.properties.deviceId));
  }, [dispatch]);

  const onClusterClick = useCallback((event) => {
    const features = map.queryRenderedFeatures(event.point, {
      layers: [clusters],
    });
    const clusterId = features[0].properties.cluster_id;
    map.getSource(id).getClusterExpansionZoom(clusterId, (error, zoom) => {
      if (!error) {
        map.easeTo({
          center: features[0].geometry.coordinates,
          zoom,
        });
      }
    });
  }, [clusters]);

  useEffect(() => {
    map.addSource(id, {
      type: 'geojson',
      data: {
        type: 'FeatureCollection',
        features: [],
      },
      cluster: true,
      clusterMaxZoom: 14,
      clusterRadius: 50,
    });
    map.addLayer({
      id,
      type: 'symbol',
      source: id,
      filter: ['!', ['has', 'point_count']],
      layout: {
        'icon-image': '{category}-{color}',
        'icon-allow-overlap': true,
        'text-field': '{name}',
        'text-allow-overlap': true,
        'text-anchor': 'bottom',
        'text-offset': [0, -2],
        'text-font': ['Roboto Regular'],
        'text-size': 12,
      },
      paint: {
        'text-halo-color': 'white',
        'text-halo-width': 1,
      },
    });
    map.addLayer({
      id: clusters,
      type: 'symbol',
      source: id,
      filter: ['has', 'point_count'],
      layout: {
        'icon-image': 'background',
        'text-field': '{point_count_abbreviated}',
        'text-font': ['Roboto Regular'],
        'text-size': 14,
      },
    });

    map.on('mouseenter', id, onMouseEnter);
    map.on('mouseleave', id, onMouseLeave);
    map.on('mouseenter', clusters, onMouseEnter);
    map.on('mouseleave', clusters, onMouseLeave);
    map.on('click', id, onMarkerClick);
    map.on('click', clusters, onClusterClick);

    return () => {
      Array.from(map.getContainer().getElementsByClassName('maplibregl-popup')).forEach((el) => el.remove());

      map.off('mouseenter', id, onMouseEnter);
      map.off('mouseleave', id, onMouseLeave);
      map.off('mouseenter', clusters, onMouseEnter);
      map.off('mouseleave', clusters, onMouseLeave);
      map.off('click', id, onMarkerClick);
      map.off('click', clusters, onClusterClick);

      if (map.getLayer(id)) {
        map.removeLayer(id);
      }
      if (map.getLayer(clusters)) {
        map.removeLayer(clusters);
      }
      if (map.getSource(id)) {
        map.removeSource(id);
      }
    };
  }, [clusters, onMarkerClick, onClusterClick]);

  useEffect(() => {
    map.getSource(id).setData({
      type: 'FeatureCollection',
      features: positions.filter((it) => devices.hasOwnProperty(it.deviceId)).map((position) => ({
        type: 'Feature',
        geometry: {
          type: 'Point',
          coordinates: [position.longitude, position.latitude],
        },
        properties: createFeature(devices, position),
      })),
    });
  }, [devices, positions]);

  return null;
};

export default PositionsMap;