syndarix/frontend/src/components/theme/ThemeToggle.tsx

/**
 * Theme Toggle Button
 * Switches between light, dark, and system themes
 */

'use client';

import { Moon, Sun, Monitor } from 'lucide-react';
import { Button } from '@/components/ui/button';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import { useTheme } from './ThemeProvider';

export function ThemeToggle() {
  const { theme, setTheme, resolvedTheme } = useTheme();

  return (
    <DropdownMenu>
      <DropdownMenuTrigger asChild>
        <Button variant="ghost" size="icon" aria-label="Toggle theme">
          {resolvedTheme === 'dark' ? (
            <Moon className="h-5 w-5" />
          ) : (
            <Sun className="h-5 w-5" />
          )}
        </Button>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="end">
        <DropdownMenuItem onClick={() => setTheme('light')}>
          <Sun className="mr-2 h-4 w-4" />
          Light
          {theme === 'light' && <span className="ml-auto">✓</span>}
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme('dark')}>
          <Moon className="mr-2 h-4 w-4" />
          Dark
          {theme === 'dark' && <span className="ml-auto">✓</span>}
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme('system')}>
          <Monitor className="mr-2 h-4 w-4" />
          System
          {theme === 'system' && <span className="ml-auto">✓</span>}
        </DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  );
}