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import React, { createContext, useContext, useEffect, useState } from 'react';
type Theme = 'dark' | 'light' | 'system';
type ThemeProviderProps = {
children: React.ReactNode;
defaultTheme?: Theme;
storageKey?: string;
};
type ThemeProviderState = {
theme: Theme;
setTheme: (theme: Theme) => void;
};
const initialState: ThemeProviderState = {
theme: 'light',
setTheme: () => null,
};
const ThemeProviderContext = createContext<ThemeProviderState>(initialState);
export function ThemeProvider({
children,
defaultTheme = 'light',
storageKey = 'vite-ui-theme',
...props
}: ThemeProviderProps) {
const [theme, setTheme] = useState<Theme>(
() => (localStorage.getItem(storageKey) as Theme) || defaultTheme,
);
useEffect(() => {
const root = window.document.documentElement;
root.classList.remove('light', 'dark');
localStorage.setItem(storageKey, theme);
root.classList.add(theme);
}, [storageKey, theme]);
return (
<ThemeProviderContext.Provider
{...props}
value={{
theme,
setTheme,
}}
>
{children}
</ThemeProviderContext.Provider>
);
}
export const useTheme = () => {
const context = useContext(ThemeProviderContext);
if (context === undefined)
throw new Error('useTheme must be used within a ThemeProvider');
return context;
};
export const useIsDarkTheme = () => {
const { theme } = useTheme();
return theme === 'dark';
};
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