import { Moon, Sun } from "lucide-react";
import { useEffect, useState } from "react";

import { Button } from "@/components/ui/button";
import { cn } from "@/lib/utils";

const ThemeToggle = ({ className }: { className?: string }) => {
  const [theme, setTheme] = useState<"light" | "dark">("light");

  useEffect(() => {
    // Get initial theme from localStorage or system preference
    const savedTheme = localStorage.getItem("theme");
    const systemTheme = window.matchMedia("(prefers-color-scheme: dark)")
      .matches
      ? "dark"
      : "light";
    const initialTheme = savedTheme || systemTheme;

    setTheme(initialTheme as "light" | "dark");
    document.documentElement.classList.toggle("dark", initialTheme === "dark");
  }, []);

  const toggleTheme = () => {
    const newTheme = theme === "light" ? "dark" : "light";
    setTheme(newTheme);
    document.documentElement.classList.toggle("dark");
    localStorage.setItem("theme", newTheme);
  };

  return (
    <Button
      variant="outline"
      size="icon"
      className={cn("size-8", className)}
      onClick={toggleTheme}
    >
      <Sun className="size-4 rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
      <Moon className="absolute size-4 rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
      <span className="sr-only">Toggle theme</span>
    </Button>
  );
};

export { ThemeToggle };