"use client";

import * as React from "react";
import { useTheme } from "next-themes";
import { Moon, Sun } from "lucide-react";
import { Button } from "@/components/ui/button";

export function ThemeToggle({ className }: { className?: string }) {
  const { theme, setTheme, resolvedTheme } = useTheme();
  const [mounted, setMounted] = React.useState(false);
  React.useEffect(() => setMounted(true), []);
  const active = theme === "system" ? resolvedTheme : theme;

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

  return (
    <Button
      variant="ghost"
      size="icon-sm"
      className={className}
      onClick={() => setTheme(active === "dark" ? "light" : "dark")}
      aria-label="Toggle theme"
    >
      {active === "dark" ? <Sun /> : <Moon />}
    </Button>
  );
}