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Edge case handling, reduce nesting, general refactor of location funcs

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Xevion
2023-09-05 12:36:09 -05:00
parent b7d301f8fe
commit 5050a296fe
1 changed files with 43 additions and 25 deletions
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68
src/location.ts
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@@ -4,10 +4,11 @@ import * as life360 from 'life360-node-api';
import logger from '@/logger';
import Result, { err, ok } from 'true-myth/result';
const center = {
const targetCenter = {
longitude: env.CENTER_LONGITUDE,
latitude: env.CENTER_LATITUDE
};
const MILES_PER_NAUTICAL_MILE = 1.15078;
const KILOMETERS_PER_MILE = 1.60934;
@@ -16,39 +17,50 @@ export type Position = {
latitude: number;
};
// K = Kilometers, N = Nautical Miles, M = Miles (default: M)
/**
*
* Calculate the distance between two points using the Haversine formula
*
* K = Kilometers, N = Nautical Miles, M = Miles (default: M)
*
* @param a
* @param b
* @param unit
*/
export function distance(
a: Position,
b: Position,
unit: 'K' | 'N' | 'M' = 'M'
) {
// TODO: Handle floating point precision errors
// Edge case: same point
if (a.latitude == b.latitude && a.longitude == b.longitude) {
return 0;
} else {
const radlat1 = (Math.PI * a.latitude) / 180;
const radlat2 = (Math.PI * b.latitude) / 180;
const theta = a.longitude - b.longitude;
const radtheta = (Math.PI * theta) / 180;
let dist =
Math.sin(radlat1) * Math.sin(radlat2) +
Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
}
if (dist > 1) dist = 1;
const radlat1 = (Math.PI * a.latitude) / 180;
const radlat2 = (Math.PI * b.latitude) / 180;
const theta = a.longitude - b.longitude;
const radtheta = (Math.PI * theta) / 180;
let dist =
Math.sin(radlat1) * Math.sin(radlat2) +
Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
dist = Math.acos(dist);
dist = (dist * 180) / Math.PI;
dist = dist * 60 * MILES_PER_NAUTICAL_MILE; // Convert to miles
if (dist > 1) dist = 1;
// Convert to the specified unit
switch (unit) {
case 'K':
return dist * KILOMETERS_PER_MILE;
case 'N':
return dist / MILES_PER_NAUTICAL_MILE;
case 'M':
default:
return dist;
}
dist = Math.acos(dist);
dist = (dist * 180) / Math.PI;
dist = dist * 60 * MILES_PER_NAUTICAL_MILE; // Convert to miles
// Convert to the specified unit
switch (unit) {
case 'K':
return dist * KILOMETERS_PER_MILE;
case 'N':
return dist / MILES_PER_NAUTICAL_MILE;
case 'M':
default:
return dist;
}
}
@@ -67,6 +79,7 @@ export async function getDistance(): Promise<Result<number, string>> {
})`
);
}
logger.debug(`Logged in to Life360 (${env.LIFE360_USERNAME}).`);
// Get my current location
let me;
@@ -88,6 +101,11 @@ export async function getDistance(): Promise<Result<number, string>> {
);
}
if (me == undefined)
return err(
`Failed to find member with ID ${env.LIFE360_MEMBER_ID} in Life360`
);
// Parse my latitude and longitude into floats
const current = {
latitude: parseFloat(me.location.latitude),
@@ -95,5 +113,5 @@ export async function getDistance(): Promise<Result<number, string>> {
};
// Calculate the distance between my location and the center, multiply x1000 for meters
return ok(distance(current, center, 'K') * 1000);
return ok(distance(current, targetCenter, 'K') * 1000);
}