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import { createContext, useContext, useEffect, useState, ReactNode } from 'react';
type Theme = 'light' | 'dark';
interface ThemeContextProps {
theme: Theme;
toggleTheme: () => void;
}
const ThemeContext = createContext<ThemeContextProps | undefined>(undefined);
export const ThemeProvider = ({ children }: { children: ReactNode }) => {
const [theme, setTheme] = useState<Theme>(() => {
const savedTheme = localStorage.getItem('theme');
if (savedTheme) {
return savedTheme as Theme;
}
const prefersDark = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
return prefersDark ? 'dark' : 'light';
});
useEffect(() => {
document.documentElement.setAttribute('data-theme', theme);
localStorage.setItem('theme', theme);
}, [theme]);
const toggleTheme = () => {
setTheme((prevTheme) => (prevTheme === 'light' ? 'dark' : 'light'));
};
return (
<ThemeContext.Provider value={{ theme, toggleTheme }}>
{children}
</ThemeContext.Provider>
);
};
export const useTheme = () => {
const context = useContext(ThemeContext);
if (!context) {
throw new Error('useTheme must be used within a ThemeProvider');
}
return context;
};
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