deer-flow/web/src/app/_components/theme-toggle.tsx

// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
// SPDX-License-Identifier: MIT

"use client";

import { Monitor, 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";
import { cn } from "~/lib/utils";

import { Tooltip } from "./tooltip";

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

  return (
    <DropdownMenu>
      <Tooltip title="Change theme">
        <DropdownMenuTrigger asChild>
          <Button variant="ghost" size="icon">
            <Sun className="h-[1.2rem] w-[1.2rem] scale-100 rotate-0 transition-all dark:scale-0 dark:-rotate-90" />
            <Moon className="absolute h-[1.2rem] w-[1.2rem] scale-0 rotate-90 transition-all dark:scale-100 dark:rotate-0" />
          </Button>
        </DropdownMenuTrigger>
      </Tooltip>
      <DropdownMenuContent align="end">
        <DropdownMenuItem onClick={() => setTheme("light")}>
          <Sun className="mr-2 h-4 w-4" />
          <span
            className={cn(
              theme === "light" ? "font-bold" : "text-muted-foreground",
            )}
          >
            Light
          </span>
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme("dark")}>
          <Moon className="mr-2 h-4 w-4" />
          <span
            className={cn(
              theme === "dark" ? "font-bold" : "text-muted-foreground",
            )}
          >
            Dark
          </span>
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme("system")}>
          <Monitor className="mr-2 h-4 w-4" />
          <span
            className={cn(
              theme === "system" ? "font-bold" : "text-muted-foreground",
            )}
          >
            System
          </span>
        </DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  );
}