104 lines
2.8 KiB
TypeScript
104 lines
2.8 KiB
TypeScript
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import { useState, useEffect, useRef, type Dispatch, type SetStateAction } from 'react';
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const PREFIX = 'wing';
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function buildKey(userId: number, name: string): string {
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return `${PREFIX}:${userId}:${name}`;
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}
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function readStorage<T>(key: string, fallback: T): T {
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try {
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const raw = localStorage.getItem(key);
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if (raw === null) return fallback;
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return JSON.parse(raw) as T;
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} catch {
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return fallback;
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}
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}
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function writeStorage<T>(key: string, value: T): void {
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try {
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localStorage.setItem(key, JSON.stringify(value));
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} catch {
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// quota exceeded or unavailable — silent
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}
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}
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function resolveDefault<T>(d: T | (() => T)): T {
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return typeof d === 'function' ? (d as () => T)() : d;
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}
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/**
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* useState와 동일한 API, localStorage 자동 동기화.
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*
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* @param userId null이면 일반 useState처럼 동작 (비영속)
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* @param name 설정 이름 (e.g. 'typeEnabled')
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* @param defaultValue 초기값 또는 lazy initializer
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* @param debounceMs localStorage 쓰기 디바운스 (기본 300ms)
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*/
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export function usePersistedState<T>(
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userId: number | null,
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name: string,
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defaultValue: T | (() => T),
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debounceMs = 300,
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): [T, Dispatch<SetStateAction<T>>] {
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const resolved = resolveDefault(defaultValue);
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const [state, setState] = useState<T>(() => {
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if (userId == null) return resolved;
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return readStorage(buildKey(userId, name), resolved);
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});
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const timerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
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const stateRef = useRef(state);
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const userIdRef = useRef(userId);
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const nameRef = useRef(name);
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stateRef.current = state;
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userIdRef.current = userId;
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nameRef.current = name;
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// userId 변경 시 해당 사용자의 저장값 재로드
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useEffect(() => {
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if (userId == null) return;
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const stored = readStorage(buildKey(userId, name), resolved);
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setState(stored);
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// eslint-disable-next-line react-hooks/exhaustive-deps
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}, [userId]);
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// debounced write
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useEffect(() => {
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if (userId == null) return;
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const key = buildKey(userId, name);
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if (timerRef.current != null) clearTimeout(timerRef.current);
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timerRef.current = setTimeout(() => {
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writeStorage(key, state);
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timerRef.current = null;
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}, debounceMs);
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return () => {
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if (timerRef.current != null) {
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clearTimeout(timerRef.current);
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timerRef.current = null;
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}
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};
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}, [state, userId, name, debounceMs]);
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// unmount 시 pending write flush
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useEffect(() => {
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return () => {
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if (timerRef.current != null) {
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clearTimeout(timerRef.current);
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timerRef.current = null;
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}
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if (userIdRef.current != null) {
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writeStorage(buildKey(userIdRef.current, nameRef.current), stateRef.current);
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}
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};
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// eslint-disable-next-line react-hooks/exhaustive-deps
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}, []);
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return [state, setState];
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}
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