37 lines
921 B
TypeScript
37 lines
921 B
TypeScript
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/**
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* Finds the N nearest shelters to a given location.
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* Ported from ShelterFinder.kt in the Android app.
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*/
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import type { Shelter, ShelterWithDistance } from '../types';
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import { distanceMeters, bearingDegrees } from '../util/distance-utils';
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/**
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* Find the N nearest shelters to the given location.
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* Returns results sorted by distance (nearest first).
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*/
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export function findNearest(
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shelters: Shelter[],
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latitude: number,
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longitude: number,
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count = 3,
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): ShelterWithDistance[] {
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return shelters
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.map((shelter) => ({
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shelter,
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distanceMeters: distanceMeters(
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latitude,
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longitude,
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shelter.latitude,
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shelter.longitude,
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),
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bearingDegrees: bearingDegrees(
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latitude,
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longitude,
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shelter.latitude,
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shelter.longitude,
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),
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}))
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.sort((a, b) => a.distanceMeters - b.distanceMeters)
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.slice(0, count);
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}
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