wehub-resource-sync
72 lines
2.2 KiB
TypeScript
72 lines
2.2 KiB
TypeScript
'use client';
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import { createContext, useContext, useEffect, useState, ReactNode } from 'react';
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type Theme = 'light' | 'dark' | 'system';
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interface ThemeContextType {
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theme: Theme;
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setTheme: (theme: Theme) => void;
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resolvedTheme: 'light' | 'dark';
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}
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const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
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export function ThemeProvider({ children }: { children: ReactNode }) {
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const [theme, setThemeState] = useState<Theme>('system');
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const [systemTheme, setSystemTheme] = useState<'light' | 'dark'>('light');
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const resolvedTheme = theme === 'system' ? systemTheme : theme;
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// Hydrate from localStorage after mount (avoids SSR mismatch)
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/* eslint-disable react-hooks/set-state-in-effect -- Hydration from localStorage must happen in effect */
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useEffect(() => {
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const stored = localStorage.getItem('theme') as Theme | null;
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if (stored && ['light', 'dark', 'system'].includes(stored)) {
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setThemeState(stored);
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}
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setSystemTheme(window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
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}, []);
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/* eslint-enable react-hooks/set-state-in-effect */
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// Apply theme to document
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useEffect(() => {
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const root = document.documentElement;
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if (resolvedTheme === 'dark') {
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root.classList.add('dark');
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} else {
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root.classList.remove('dark');
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}
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}, [resolvedTheme]);
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// Listen to system theme changes
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useEffect(() => {
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const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
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const handleChange = () => {
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setSystemTheme(mediaQuery.matches ? 'dark' : 'light');
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};
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mediaQuery.addEventListener('change', handleChange);
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return () => mediaQuery.removeEventListener('change', handleChange);
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}, []);
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// Save theme to localStorage
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const handleSetTheme = (newTheme: Theme) => {
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setThemeState(newTheme);
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localStorage.setItem('theme', newTheme);
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};
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return (
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<ThemeContext.Provider value={{ theme, setTheme: handleSetTheme, resolvedTheme }}>
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{children}
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</ThemeContext.Provider>
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);
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}
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export function useTheme() {
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const context = useContext(ThemeContext);
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if (!context) {
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throw new Error('useTheme must be used within ThemeProvider');
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}
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return context;
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}
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