node_modules/frontend/components/theme-toggle.tsx

"use client";

import * as React from "react";
import { Moon, Sun } from "lucide-react";
import { useTheme } from "@/components/theme-provider";
import { cn } from "@/lib/utils";

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

import { buttonVariants } from "@/components/ui/button";

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

  return (
    <DropdownMenu>
      <DropdownMenuTrigger
        render={
          <span
            className={cn(
              buttonVariants({ variant: "ghost", size: "icon" }),
              "rounded-full cursor-pointer"
            )}
            role="button"
            tabIndex={0}
            aria-label="Toggle theme"
          >
            <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>
          </span>
        }
      />
      <DropdownMenuContent align="end">
        <DropdownMenuItem onClick={() => setTheme("light")}>
          Light
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme("dark")}>
          Dark
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme("system")}>
          System
        </DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  );
}