'use client';

import * as React from 'react';
import { Moon, Sun } from 'lucide-react';
import { useTheme } from 'next-themes';

import { Button } from '@/components/ui/button';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';

export function ThemeToggleButton() {
  const { setTheme } = useTheme();
  const [mounted, setMounted] = React.useState(false);

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

  if (!mounted) {
    // Render a placeholder or null to avoid hydration mismatch, matching size of actual button
    return <Button variant="outline" size="icon" disabled className="h-9 w-9 md:h-10 md:w-10 opacity-0 pointer-events-none"><Sun className="h-[1.2rem] w-[1.2rem]" /></Button>;
  }

  return (
    <DropdownMenu>
      <DropdownMenuTrigger asChild>
        <Button variant="outline" size="icon" className="h-9 w-9 md:h-10 md:w-10">
          <Sun className="h-[1.2rem] w-[1.2rem] rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
          <Moon className="absolute h-[1.2rem] w-[1.2rem] rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
          <span className="sr-only">Toggle theme</span>
        </Button>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="end">
        <DropdownMenuItem onClick={() => setTheme('light')}>
          Light
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme('dark')}>
          Dark
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme('system')}>
          System
        </DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  );
}