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import { invalidateAll } from '$app/navigation';
import { page } from '$app/stores';
import { get } from 'svelte/store';
// Skip the refocus refresh on login and edit pages (in-progress edits).
const EXCLUDED_ROUTES: Record<string, true> = {
'/login': true,
'/grocery/[id]': true,
'/projects/[projectId]/routine/[routineId]': true,
};
const MIN_AWAY_MS = 10_000;
/** Re-run page loads on refocus after MIN_AWAY_MS away; call from onMount. */
export function refreshOnRefocus(): () => void {
let deactivatedAt: number | null = null;
const deactivate = () => {
deactivatedAt ??= Date.now();
};
const activate = () => {
if (deactivatedAt === null || document.visibilityState !== 'visible')
return;
const awayMs = Date.now() - deactivatedAt;
deactivatedAt = null;
if (awayMs < MIN_AWAY_MS) return;
if ((get(page).route.id ?? '') in EXCLUDED_ROUTES) return;
invalidateAll();
};
const onVisibilityChange = () => {
if (document.visibilityState === 'hidden') deactivate();
else activate();
};
document.addEventListener('visibilitychange', onVisibilityChange);
window.addEventListener('blur', deactivate);
window.addEventListener('focus', activate);
return () => {
document.removeEventListener('visibilitychange', onVisibilityChange);
window.removeEventListener('blur', deactivate);
window.removeEventListener('focus', activate);
};
}
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