"use client";
import { useEffect, useState } from "react";

export default function ThemeToggle() {
  const [theme, setTheme] = useState("light");

  useEffect(() => {
    const saved = localStorage.getItem("theme") || "light";
    setTheme(saved);
    document.documentElement.setAttribute("data-theme", saved);
  }, []);

  function toggle() {
    const next = theme === "dark" ? "light" : "dark";
    setTheme(next);
    document.documentElement.setAttribute("data-theme", next);
    localStorage.setItem("theme", next);
  }

  return (
    <button
      onClick={toggle}
      className="theme-btn"
      aria-label="Cambiar tema"
      suppressHydrationWarning
    >
      {theme === "dark" ? "☀" : "🌙"}
    </button>
  );
}