52 lines
1.5 KiB
TypeScript
52 lines
1.5 KiB
TypeScript
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import { VillageBoundaryFeature } from "../services/color-scale";
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/**
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* Merges an array of data items (with hc-key, value, color) into
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* a GeoJSON FeatureCollection by matching on feature.properties["hc-key"].
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*
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* @param geojsonInput The source GeoJSON FeatureCollection
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* @param dataList Array of { "hc-key", value, color }
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* @returns A new GeoJSON FeatureCollection with added
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* value and color properties
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*/
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export function mergeDataToGeoJSON(
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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geojsonInput: any,
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dataList: VillageBoundaryFeature[]
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) {
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// Build lookup map from hc-key to { value, color }
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const lookupByKey: Record<string, { value: number; color: string }> = {};
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for (const item of dataList) {
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lookupByKey[item["hc-key"]] = {
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value: item.value,
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color: item.color,
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};
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}
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// Deep-clone so we don’t mutate the original
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const mergedGeoJSON = JSON.parse(JSON.stringify(geojsonInput));
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mergedGeoJSON.features = mergedGeoJSON.features.map(
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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(feature: any) => {
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const key = (feature.properties as never)["hc-key"] as string;
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const match = lookupByKey[key] ?? {
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value: null,
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color: "#cccccc",
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};
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// Merge new props onto existing properties
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feature.properties = {
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...feature.properties,
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value: match.value,
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color: match.color,
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};
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return feature;
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}
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);
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return mergedGeoJSON;
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}
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