42 lines
1.2 KiB
TypeScript
42 lines
1.2 KiB
TypeScript
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import type { PropertyFeature, POIDistanceInfo } from '@/types';
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/**
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* Build the flat property name used by the hexgrid heatmap to read
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* travel-time values directly from feature.properties.
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*/
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export function poiMetricPropertyName(poiId: number, travelMode: string): string {
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return `poi_travel_${poiId}_${travelMode}`;
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}
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/**
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* Shallow-copy every feature and inject a flat numeric property
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* (e.g. `poi_travel_7_TRANSIT = 1800`) so the heatmap can color by it.
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*
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* Features without matching POI distance data get `undefined` for that property,
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* which the heatmap will skip (same as a listing with no sqm value).
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*/
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export function injectPoiMetricProperty(
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features: PropertyFeature[],
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poiId: number,
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travelMode: string,
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): PropertyFeature[] {
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const propName = poiMetricPropertyName(poiId, travelMode);
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return features.map((feature) => {
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const distances: POIDistanceInfo[] | undefined = feature.properties.poi_distances;
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const match = distances?.find(
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(d) => d.poi_id === poiId && d.travel_mode === travelMode,
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);
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if (match === undefined) return feature;
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return {
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...feature,
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properties: {
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...feature.properties,
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[propName]: match.duration_seconds,
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},
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};
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});
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}
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