42 lines
1.5 KiB
TypeScript
42 lines
1.5 KiB
TypeScript
 
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import { atom } from 'jotai';
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import { atomWithStorage, createJSONStorage } from 'jotai/utils';
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const STORAGE_KEY = 'cinny_recent_forward_targets_v1';
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const MAX_RECENT_FORWARD_TARGETS = 8;
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// Internal atom persists as a plain string[] of roomIds (JSON-serializable).
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// getOnInit reads localStorage synchronously so the Recent row is present on the
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// first render of the Forward dialog (no flash of the empty default).
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const internalAtom = atomWithStorage<string[]>(
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STORAGE_KEY,
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[],
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createJSONStorage(() => localStorage),
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{ getOnInit: true },
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);
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/**
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* Global atom: string[] of the most recent distinct roomIds forwarded to.
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* Most-recent first, deduped, capped at MAX_RECENT_FORWARD_TARGETS.
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* Backed by localStorage (device-local convenience — not synced across devices).
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*/
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export const recentForwardTargetsAtom = atom(
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(get): string[] => get(internalAtom),
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(_get, set, updater: string[] | ((prev: string[]) => string[])) => {
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set(internalAtom, (prev) => {
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const prevList = Array.isArray(prev) ? prev : [];
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const next = typeof updater === 'function' ? updater(prevList) : updater;
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return next;
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});
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},
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);
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/**
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* Prepend a roomId: dedupes, drops empties, moves an existing id to the front,
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* caps at MAX_RECENT_FORWARD_TARGETS.
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*/
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export const addRecentForwardTarget = (prev: string[], roomId: string): string[] => {
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if (!roomId) return prev;
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const withoutDupe = prev.filter((id) => id !== roomId);
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return [roomId, ...withoutDupe].slice(0, MAX_RECENT_FORWARD_TARGETS);
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};
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