export function setPolygonFilterLayerUpdater()

in src/reducers/vis-state-updaters.js [1695:1758]
51 lines of code
4 McCabe index (conditional complexity)

export function setPolygonFilterLayerUpdater(state, payload) {
  const {layer, feature} = payload;
  const filterId = getFilterIdInFeature(feature);

  // let newFilter = null;
  let filterIdx;
  let newLayerId = [layer.id];
  let newState = state;
  // If polygon filter already exists, we need to find out if the current layer is already included
  if (filterId) {
    filterIdx = state.filters.findIndex(f => f.id === filterId);

    if (!state.filters[filterIdx]) {
      // what if filter doesn't exist?... not possible.
      // because features in the editor is passed in from filters and editors.
      // but we will move this feature back to editor just in case
      const noneFilterFeature = {
        ...feature,
        properties: {
          ...feature.properties,
          filterId: null
        }
      };

      return {
        ...state,
        editor: {
          ...state.editor,
          features: [...state.editor.features, noneFilterFeature],
          selectedFeature: noneFilterFeature
        }
      };
    }
    const filter = state.filters[filterIdx];
    const {layerId = []} = filter;
    const isLayerIncluded = layerId.includes(layer.id);

    newLayerId = isLayerIncluded
      ? // if layer is included, remove it
        layerId.filter(l => l !== layer.id)
      : [...layerId, layer.id];
  } else {
    // if we haven't create the polygon filter, create it
    const newFilter = generatePolygonFilter([], feature);
    filterIdx = state.filters.length;

    // add feature, remove feature from eidtor
    newState = {
      ...state,
      filters: [...state.filters, newFilter],
      editor: {
        ...state.editor,
        features: state.editor.features.filter(f => f.id !== feature.id),
        selectedFeature: newFilter.value
      }
    };
  }

  return setFilterUpdater(newState, {
    idx: filterIdx,
    prop: 'layerId',
    value: newLayerId
  });
}