48 lines
1.0 KiB
TypeScript
48 lines
1.0 KiB
TypeScript
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import { useState, useEffect, useCallback } from 'react';
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type Theme = 'dark' | 'light';
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const STORAGE_KEY = 'wing:theme';
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const DEFAULT_THEME: Theme = 'dark';
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function readTheme(): Theme {
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try {
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const raw = localStorage.getItem(STORAGE_KEY);
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if (raw === 'light' || raw === 'dark') return raw;
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} catch {
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// storage unavailable
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}
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return DEFAULT_THEME;
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}
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function applyTheme(theme: Theme) {
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document.documentElement.dataset.theme = theme;
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}
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export function useTheme() {
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const [theme, setThemeState] = useState<Theme>(() => {
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const t = readTheme();
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applyTheme(t);
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return t;
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});
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useEffect(() => {
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applyTheme(theme);
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}, [theme]);
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const setTheme = useCallback((t: Theme) => {
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setThemeState(t);
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try {
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localStorage.setItem(STORAGE_KEY, t);
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} catch {
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// quota exceeded or unavailable
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}
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}, []);
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const toggleTheme = useCallback(() => {
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setTheme(theme === 'dark' ? 'light' : 'dark');
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}, [theme, setTheme]);
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return { theme, setTheme, toggleTheme } as const;
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}
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