backend-api/frontend/components/common/ThemeToggle.tsx

/*
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File: frontend/components/common/ThemeToggle.tsx
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*/
"use client";

import React from "react";
import { Moon, Sun, Laptop } from "lucide-react";
import { useTheme } from "next-themes";
import { Button } from "@/components/ui/button";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from "@/components/ui/tooltip";

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

  return (
    <TooltipProvider>
      <Tooltip>
        <TooltipTrigger asChild>
          <DropdownMenu>
            <DropdownMenuTrigger asChild>
              <Button variant="ghost" size="icon">
                <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")}>
                <Sun className="mr-2 h-4 w-4" />
                <span>Light</span>
              </DropdownMenuItem>
              <DropdownMenuItem onClick={() => setTheme("dark")}>
                <Moon className="mr-2 h-4 w-4" />
                <span>Dark</span>
              </DropdownMenuItem>
              <DropdownMenuItem onClick={() => setTheme("system")}>
                <Laptop className="mr-2 h-4 w-4" />
                <span>System</span>
              </DropdownMenuItem>
            </DropdownMenuContent>
          </DropdownMenu>
        </TooltipTrigger>
        <TooltipContent>
          <p>Change theme</p>
        </TooltipContent>
      </Tooltip>
    </TooltipProvider>
  );
}