"use client";

import { Moon, Sun } from "lucide-react";
import { useTheme } from "next-themes";
import { useEffect, useState } from "react";
import { cn } from "@/lib/utils";

interface ThemeToggleProps {
  className?: string;
}

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

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

  if (!mounted) {
    return (
      <button
        type="button"
        aria-label="Toggle theme"
        className={cn(
          "relative flex h-9 w-9 items-center justify-center rounded-lg border border-border bg-surface text-muted",
          className
        )}
      />
    );
  }

  const isDark = (theme === "system" ? resolvedTheme : theme) === "dark";

  return (
    <button
      type="button"
      aria-label={isDark ? "Switch to light mode" : "Switch to dark mode"}
      onClick={() => setTheme(isDark ? "light" : "dark")}
      className={cn(
        "relative flex h-9 w-9 items-center justify-center rounded-lg border border-border bg-surface text-muted transition-colors hover:border-accent/30 hover:text-accent",
        className
      )}
    >
      <Sun
        className={cn(
          "absolute h-4 w-4 transition-all duration-300",
          isDark ? "rotate-90 scale-0 opacity-0" : "rotate-0 scale-100 opacity-100"
        )}
      />
      <Moon
        className={cn(
          "absolute h-4 w-4 transition-all duration-300",
          isDark ? "rotate-0 scale-100 opacity-100" : "-rotate-90 scale-0 opacity-0"
        )}
      />
    </button>
  );
}