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'use client';
import { createContext, useContext, useEffect, useState, ReactNode } from 'react';
type Theme = 'light' | 'dark' | 'system';
interface ThemeContextType {
theme: Theme;
setTheme: (theme: Theme) => void;
}
const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
export function ThemeProvider({ children }: { children: ReactNode }) {
const [theme, setTheme] = useState<Theme>('system');
useEffect(() => {
// Get the theme preference from localStorage if available
const storedTheme = localStorage.getItem('theme') as Theme | null;
if (storedTheme) {
setTheme(storedTheme);
}
}, []);
useEffect(() => {
const root = window.document.documentElement;
// Remove all theme classes
root.classList.remove('light', 'dark');
// Add the appropriate class based on theme
if (theme === 'system') {
const systemTheme = window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
root.classList.add(systemTheme);
} else {
root.classList.add(theme);
}
// Store the preference
localStorage.setItem('theme', theme);
}, [theme]);
return (
<ThemeContext.Provider value={{ theme, setTheme }}>
{children}
</ThemeContext.Provider>
);
}
export function useTheme() {
const context = useContext(ThemeContext);
if (context === undefined) {
throw new Error('useTheme must be used within a ThemeProvider');
}
return context;
}
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