big upgrade

src/components/ThemeToggle.tsx

@@ -0,0 +1,71 @@
+import { useEffect, useState } from "react";
+import { useTheme } from "next-themes";
+import { Sun, Moon, Monitor } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
+} from "@/components/ui/dropdown-menu";
+
+interface ThemeToggleProps {
+  className?: string;
+}
+
+const themeLabels: Record<string, string> = {
+  light: "Hell",
+  dark: "Dunkel",
+  system: "System",
+};
+
+export function ThemeToggle({ className }: ThemeToggleProps) {
+  const { theme, setTheme, resolvedTheme } = useTheme();
+  const [mounted, setMounted] = useState(false);
+
+  useEffect(() => {
+    setMounted(true);
+  }, []);
+
+  const currentLabel = themeLabels[theme ?? "system"] ?? "System";
+
+  const icon = !mounted ? (
+    <Monitor className="h-4 w-4" />
+  ) : theme === "system" ? (
+    <Monitor className="h-4 w-4" />
+  ) : resolvedTheme === "dark" ? (
+    <Moon className="h-4 w-4" />
+  ) : (
+    <Sun className="h-4 w-4" />
+  );
+
+  return (
+    <DropdownMenu>
+      <DropdownMenuTrigger asChild>
+        <Button
+          variant="ghost"
+          size="icon"
+          className={className}
+          aria-label={`Theme wechseln, aktuell: ${currentLabel}`}
+        >
+          {icon}
+          <span className="sr-only">Theme wechseln</span>
+        </Button>
+      </DropdownMenuTrigger>
+      <DropdownMenuContent align="end">
+        <DropdownMenuItem onClick={() => setTheme("light")}>
+          <Sun className="mr-2 h-4 w-4" />
+          Hell
+        </DropdownMenuItem>
+        <DropdownMenuItem onClick={() => setTheme("dark")}>
+          <Moon className="mr-2 h-4 w-4" />
+          Dunkel
+        </DropdownMenuItem>
+        <DropdownMenuItem onClick={() => setTheme("system")}>
+          <Monitor className="mr-2 h-4 w-4" />
+          System
+        </DropdownMenuItem>
+      </DropdownMenuContent>
+    </DropdownMenu>
+  );
+}