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import type { FunctionalComponent } from 'preact';
import { h, Fragment } from 'preact';
import { useState, useEffect } from 'preact/hooks';
const themes = ['system', 'light', 'dark'];
const icons = [
<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" fill="currentColor">
<path
fill-rule="evenodd"
d="M3 5a2 2 0 012-2h10a2 2 0 012 2v8a2 2 0 01-2 2h-2.22l.123.489.804.804A1 1 0 0113 18H7a1 1 0 01-.707-1.707l.804-.804L7.22 15H5a2 2 0 01-2-2V5zm5.771 7H5V5h10v7H8.771z"
clip-rule="evenodd"
/>
</svg>,
<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" fill="currentColor">
<path
fillRule="evenodd"
d="M10 2a1 1 0 011 1v1a1 1 0 11-2 0V3a1 1 0 011-1zm4 8a4 4 0 11-8 0 4 4 0 018 0zm-.464 4.95l.707.707a1 1 0 001.414-1.414l-.707-.707a1 1 0 00-1.414 1.414zm2.12-10.607a1 1 0 010 1.414l-.706.707a1 1 0 11-1.414-1.414l.707-.707a1 1 0 011.414 0zM17 11a1 1 0 100-2h-1a1 1 0 100 2h1zm-7 4a1 1 0 011 1v1a1 1 0 11-2 0v-1a1 1 0 011-1zM5.05 6.464A1 1 0 106.465 5.05l-.708-.707a1 1 0 00-1.414 1.414l.707.707zm1.414 8.486l-.707.707a1 1 0 01-1.414-1.414l.707-.707a1 1 0 011.414 1.414zM4 11a1 1 0 100-2H3a1 1 0 000 2h1z"
clipRule="evenodd"
/>
</svg>,
<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" fill="currentColor">
<path d="M17.293 13.293A8 8 0 016.707 2.707a8.001 8.001 0 1010.586 10.586z" />
</svg>,
];
const ThemeToggle: FunctionalComponent = () => {
const [theme, setTheme] = useState(themes[0]);
useEffect(() => {
const user = localStorage.getItem('theme');
if (!user) return;
setTheme(user);
}, []);
useEffect(() => {
const root = document.documentElement;
if (theme === 'system') {
localStorage.removeItem('theme');
if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
root.classList.add('theme-dark');
} else {
root.classList.remove('theme-dark');
}
} else {
localStorage.setItem('theme', theme);
if (theme === 'light') {
root.classList.remove('theme-dark');
} else {
root.classList.add('theme-dark');
}
}
}, [theme]);
return (
<div id="theme-toggle">
{themes.map((t, i) => {
const icon = icons[i];
const checked = t === theme;
return (
<label className={checked ? 'checked' : ''}>
{icon}
<input type="radio" name="theme-toggle" checked={checked} value={t} title={`Use ${t} theme`} aria-label={`Use ${t} theme`} onChange={() => setTheme(t)} />
</label>
);
})}
</div>
);
};
export default ThemeToggle;
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