"use client";

import { useTheme } from "next-themes";
import { useEffect, useState } from "react";

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

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

  if (!mounted) {
    return (
      <button
        type="button"
        aria-label="切换主题"
        className="p-2.5 rounded-lg text-stone-500 hover:bg-stone-100 dark:hover:bg-stone-800 transition-colors"
      >
        <span className="w-5 h-5 block" />
      </button>
    );
  }

  const isDark = theme === "dark";

  return (
    <button
      type="button"
      aria-label={isDark ? "切换到日间模式" : "切换到夜间模式"}
      onClick={() => setTheme(isDark ? "light" : "dark")}
      className="p-2.5 rounded-lg text-stone-500 hover:text-stone-700 hover:bg-stone-100 dark:text-stone-400 dark:hover:text-stone-200 dark:hover:bg-stone-800 transition-colors"
    >
      {isDark ? (
        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className="w-5 h-5">
          <circle cx="12" cy="12" r="4" />
          <path d="M12 2v2M12 20v2M4.93 4.93l1.41 1.41M17.66 17.66l1.41 1.41M2 12h2M20 12h2M6.34 17.66l-1.41 1.41M19.07 4.93l-1.41 1.41" />
        </svg>
      ) : (
        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className="w-5 h-5">
          <path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z" />
        </svg>
      )}
    </button>
  );
}