MapComplete/UI/ImportFlow/ImportUtils.ts

import {Store} from "../../Logic/UIEventSource";
import {GeoOperations} from "../../Logic/GeoOperations";
import {Feature, Geometry} from "@turf/turf";

export class ImportUtils {
    public static partitionFeaturesIfNearby(
        toPartitionFeatureCollection: ({ features: Feature<Geometry>[] }),
        compareWith: Store<{ features: Feature[] }>,
        cutoffDistanceInMeters: Store<number>)
        : Store<{ hasNearby: Feature[], noNearby: Feature[] }> {
        return compareWith.map(osmData => {
            if (osmData?.features === undefined) {
                return undefined
            }
            if (osmData.features.length === 0) {
                return {noNearby: toPartitionFeatureCollection.features, hasNearby: []}
            }
            const maxDist = cutoffDistanceInMeters.data

            const hasNearby = []
            const noNearby = []
            for (const toImportElement of toPartitionFeatureCollection.features) {
                const hasNearbyFeature = osmData.features.some(f =>
                    maxDist >= GeoOperations.distanceBetween(<any> toImportElement.geometry.coordinates, GeoOperations.centerpointCoordinates(f)))
                if (hasNearbyFeature) {
                    hasNearby.push(toImportElement)
                } else {
                    noNearby.push(toImportElement)
                }
            }

            return {hasNearby, noNearby}
        }, [cutoffDistanceInMeters]);
    }
}