refactor: made WiFi Qr code component modular

frontend/src/components/modals/WifiQrModal.tsx

@@ -1,69 +1,24 @@
 "use client";
 
-import { useRef, useState, useEffect } from "react";
 import Modal from "@/components/modals/Modal";
-import { QRCodeSVG } from "qrcode.react";
+import WifiQr from "@/components/utils/WifiQr";
-import { useGlobal } from "@/contexts/GlobalContext";
 
 type Props = {
   onClose: () => void;
 };
 
 export default function WifiQrModal({ onClose }: Props) {
-  const modalRef = useRef<HTMLDivElement | null>(null);
-  const [qrSize, setQrSize] = useState(220);
-  const { wifiConfig, wifiString } = useGlobal();
-
-  useEffect(() => {
-    function updateSize() {
-      if (modalRef.current) {
-        // Make sure the QR code scales with the size of the modal
-        const modalWidth = modalRef.current.offsetWidth;
-        const modalHeight = modalRef.current.offsetHeight;
-        const sizeFromWidth = modalWidth * 0.8;
-        const sizeFromHeight = modalHeight * 0.8;
-        setQrSize(Math.floor(Math.min(sizeFromWidth, sizeFromHeight)));
-      }
-    }
-    updateSize();
-
-    window.addEventListener("resize", updateSize);
-    return () => window.removeEventListener("resize", updateSize);
-  }, []);
-
   return (
-    <Modal ref={modalRef} onClose={onClose} contentClassName="max-w-md">
+    <Modal onClose={onClose} contentClassName="max-w-md">
       <div className="flex-center flex-col gap-4">
         <h2 className="text-2xl font-bold text-primary text-center">
-          Wi‑Fi QR Code
+          Wi-Fi QR Code
         </h2>
-        {wifiConfig && wifiString ? (
+        <WifiQr className="w-full h-72" sizeRatio={0.88} />
-          <>
+
-            <QRCodeSVG
+        <p className="text-sm text-muted text-center">
-              value={wifiString}
+          Scan this QR code to join the network
-              size={qrSize}
+        </p>
-              level="H"
-              bgColor="transparent"
-              fgColor="currentColor"
-              marginSize={4}
-              title="Wi-Fi Access QR Code"
-              imageSettings={{
-                src: "/unifi.svg",
-                height: qrSize / 4,
-                width: qrSize / 4,
-                excavate: true,
-              }}
-            />
-            <p className="text-sm text-muted">
-              Scan this QR code to join the network:{" "}
-              <strong>{wifiConfig.ssid}</strong>
-            </p>
-          </>
-        ) : (
-          <p className="text-sm text-muted text-center">
-            No Wi‑Fi credentials configured.
-          </p>
-        )}
       </div>
     </Modal>
   );

frontend/src/components/utils/WifiQr.tsx

@@ -0,0 +1,88 @@
+"use client";
+
+import React, { useEffect, useRef, useState } from "react";
+import { QRCodeSVG } from "qrcode.react";
+import { useGlobal } from "@/contexts/GlobalContext";
+
+type Props = {
+  className?: string;
+  /** Fraction of the smaller parent dimension to use for the QR (0 < n <= 1). Default 0.8 */
+  sizeRatio?: number;
+  /** Fixed size override (in px). If provided, this takes precedence over automatic sizing. */
+  overrideSize?: number;
+  /** URL for the logo inside the QR. Default uses /unifi.svg like the original. */
+  imageSrc?: string;
+};
+
+export default function WifiQr({
+  className,
+  sizeRatio = 0.8,
+  overrideSize,
+  imageSrc = "/unifi.svg",
+}: Props) {
+  const containerRef = useRef<HTMLDivElement | null>(null);
+  const [qrSize, setQrSize] = useState<number>(220);
+  const { wifiConfig, wifiString } = useGlobal();
+
+  useEffect(() => {
+    if (overrideSize && overrideSize > 0) {
+      setQrSize(Math.floor(overrideSize));
+      return;
+    }
+
+    const element = containerRef.current;
+    if (!element) return;
+
+    function updateFromRect(width: number, height: number) {
+      const fromWidth = width * sizeRatio;
+      const fromHeight = height * sizeRatio;
+      const newSize = Math.max(32, Math.floor(Math.min(fromWidth, fromHeight)));
+      setQrSize(newSize);
+    }
+
+    // Initial measurement
+    const rect = element.getBoundingClientRect();
+    updateFromRect(rect.width, rect.height);
+
+    // Observe size changes of the parent container
+    const observer = new ResizeObserver((entries) => {
+      for (const entry of entries) {
+        const contentRect = entry.contentRect;
+        updateFromRect(contentRect.width, contentRect.height);
+      }
+    });
+
+    observer.observe(element);
+    return () => observer.disconnect();
+  }, [sizeRatio, overrideSize]);
+
+  return (
+    <div ref={containerRef} className={`flex-center ${className}`}>
+      <div className="flex-center flex-col gap-4 text-center">
+        {wifiConfig && wifiString ? (
+          <>
+            <QRCodeSVG
+              value={wifiString}
+              size={qrSize}
+              level="H"
+              bgColor="transparent"
+              fgColor="currentColor"
+              title={`Wi-Fi access: ${wifiConfig.ssid}`}
+              imageSettings={{
+                src: imageSrc,
+                height: Math.floor(qrSize / 4),
+                width: Math.floor(qrSize / 4),
+                excavate: true,
+              }}
+            />
+            <p className="text-sm text-muted">
+              Scan to join <strong>{wifiConfig.ssid}</strong>
+            </p>
+          </>
+        ) : (
+          <p className="text-sm text-muted">No Wi‑Fi credentials configured.</p>
+        )}
+      </div>
+    </div>
+  );
+}