65 lines
1.9 KiB
TypeScript
65 lines
1.9 KiB
TypeScript
import { createContext, useContext, useState, useEffect, type ReactNode } from 'react';
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type Theme = 'light' | 'dark' | 'system';
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type ThemeContextType = {
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theme: Theme;
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resolved: 'light' | 'dark';
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setTheme: (t: Theme) => void;
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};
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const ThemeContext = createContext<ThemeContextType | null>(null);
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function getSystemTheme(): 'light' | 'dark' {
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return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
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}
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function applyTheme(theme: Theme) {
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const resolved = theme === 'system' ? getSystemTheme() : theme;
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if (theme === 'system') {
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document.documentElement.removeAttribute('data-theme');
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} else {
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document.documentElement.setAttribute('data-theme', theme);
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}
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return resolved;
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}
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export function ThemeProvider({ children }: { children: ReactNode }) {
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const [theme, setThemeState] = useState<Theme>(() => {
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return (localStorage.getItem('agent-fox-theme') as Theme) || 'system';
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});
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const [resolved, setResolved] = useState<'light' | 'dark'>(() => applyTheme(
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(localStorage.getItem('agent-fox-theme') as Theme) || 'system'
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));
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const setTheme = (t: Theme) => {
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localStorage.setItem('agent-fox-theme', t);
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setThemeState(t);
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setResolved(applyTheme(t));
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};
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useEffect(() => {
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setResolved(applyTheme(theme));
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}, [theme]);
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useEffect(() => {
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if (theme !== 'system') return;
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const mq = window.matchMedia('(prefers-color-scheme: dark)');
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const handler = () => setResolved(applyTheme('system'));
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mq.addEventListener('change', handler);
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return () => mq.removeEventListener('change', handler);
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}, [theme]);
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return (
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<ThemeContext.Provider value={{ theme, resolved, setTheme }}>
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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 ctx = useContext(ThemeContext);
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if (!ctx) throw new Error('useTheme must be used within ThemeProvider');
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return ctx;
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}
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