ui/components/theme-toggle.tsx

'use client';

import { Moon, Sun } from 'lucide-react';
import { useTheme } from 'next-themes';
import * as React from 'react';

import { Button } from '@/components/ui/button';

export function ThemeToggle() {
  const { setTheme, theme } = useTheme();
  const [mounted, setMounted] = React.useState(false);

  React.useEffect(() => {
    setMounted(true);
  }, []);

  if (!mounted) {
    return <Button variant="ghost" size="icon" className="h-7 w-7" disabled />;
  }

  return (
    <Button
      variant="ghost"
      size="icon"
      className="h-7 w-7"
      onClick={() => setTheme(theme === 'dark' ? 'light' : 'dark')}
    >
      <Sun className="h-3.5 w-3.5 scale-100 rotate-0 transition-all dark:scale-0 dark:-rotate-90" />
      <Moon className="absolute h-3.5 w-3.5 scale-0 rotate-90 transition-all dark:scale-100 dark:rotate-0" />
      <span className="sr-only">Toggle theme</span>
    </Button>
  );
}