"use client";

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

interface ThemeToggleProps {
  collapsed?: boolean;
}

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

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

  if (!mounted) {
    return (
      <Button variant="ghost" size={collapsed ? "icon" : "default"} className="w-full justify-start gap-2 opacity-0">
        <Sun className="h-4 w-4" />
      </Button>
    );
  }

  const isDark = theme === "dark";

  return (
    <Button
      variant="ghost"
      size={collapsed ? "icon" : "default"}
      onClick={() => setTheme(isDark ? "light" : "dark")}
      className="w-full justify-start gap-2 text-sm"
      title={isDark ? "라이트 모드" : "다크 모드"}
    >
      {isDark ? <Sun className="h-4 w-4" /> : <Moon className="h-4 w-4" />}
      {!collapsed && (isDark ? "라이트 모드" : "다크 모드")}
    </Button>
  );
}