33 lines
815 B
TypeScript
33 lines
815 B
TypeScript
import { getDeviceOnlineStaleSeconds } from './env';
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export type EffectiveDeviceStatus = 'online' | 'offline';
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type EffectiveDeviceStatusParams = {
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status: string | null | undefined;
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lastSeenAt: Date | null | undefined;
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now?: Date;
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staleAfterSeconds?: number;
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};
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export const getEffectiveDeviceStatus = ({
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status,
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lastSeenAt,
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now = new Date(),
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staleAfterSeconds = getDeviceOnlineStaleSeconds(),
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}: EffectiveDeviceStatusParams): EffectiveDeviceStatus => {
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if (status !== 'online') {
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return 'offline';
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}
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if (!(lastSeenAt instanceof Date) || Number.isNaN(lastSeenAt.getTime())) {
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return 'offline';
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}
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const elapsedMs = now.getTime() - lastSeenAt.getTime();
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if (elapsedMs < 0) {
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return 'online';
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}
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return elapsedMs <= staleAfterSeconds * 1000 ? 'online' : 'offline';
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};
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