From 705080a554d870e59dbb49a2dd4c960f88a57e1f Mon Sep 17 00:00:00 2001
From: lakshay <lakshay@resensys.net>
Date: Mon, 29 Jun 2026 13:46:46 -0400
Subject: [PATCH] Replace Scanbot SDK with native barcode scanner.

Use BarcodeDetector and ZXing for unlimited device ID scanning instead of the Scanbot trial SDK.
---
 templates/index.html | 258 ++++++++++++++++++++++++++++---------------
 1 file changed, 171 insertions(+), 87 deletions(-)

diff --git a/templates/index.html b/templates/index.html
index 6c3a1db..4c59d0e 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -8,6 +8,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/toastify-js/src/toastify.min.css" />
   <script src="https://cdn.jsdelivr.net/npm/toastify-js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/@zxing/library@0.21.3/umd/index.min.js"></script>
 
   <style>
     :root{color-scheme: light dark;}
@@ -1202,10 +1203,6 @@
              style="flex:1;min-width:200px;"
              placeholder="e.g. 15-03-58-80"
              title="Type Device ID and press Enter to add"/>
-      <!-- <button id="scan-btn"
-              style="padding:6px 10px;border-radius:10px;border:1px solid #ccc;cursor:pointer;">
-        <i class="fas fa-barcode"></i> Scan
-      </button> -->
       <button id="btn-scan" class="check-btn"
               style="padding:6px 10px;border-radius:10px;border:1px solid #ccc;cursor:pointer;">
         &#128247; Scan ID
@@ -2632,9 +2629,7 @@
     });
   </script>
 
-  <script type="module">
-    import "https://cdn.jsdelivr.net/npm/scanbot-web-sdk@8.0.0/bundle/ScanbotSDK.ui2.min.js";
-
+  <script>
     // -------------------------------------------------------------------------
     // Toast helpers (Toastify is global from the non-module script tag above)
     // -------------------------------------------------------------------------
@@ -2668,12 +2663,6 @@
       }).showToast();
     }
 
-    // -------------------------------------------------------------------------
-    // Scanbot init
-    // -------------------------------------------------------------------------
-    const cdn = "https://cdn.jsdelivr.net/npm/scanbot-web-sdk@8.0.0/bundle/bin/complete/";
-    const sdk = await ScanbotSDK.initialize({ enginePath: cdn, licenseKey: "" });
-
     // -------------------------------------------------------------------------
     // State
     // -------------------------------------------------------------------------
@@ -2682,47 +2671,189 @@
     let confirming = false;
 
     // -------------------------------------------------------------------------
-    // Device ID parsing/validation
+    // Barcode scanner (BarcodeDetector + ZXing)
     // -------------------------------------------------------------------------
-    function normalizeCandidate(text) {
-      if (!text) return null;
+    const scannerOverlay = document.getElementById("scanner-overlay");
+    const scannerVideo = document.getElementById("scanner-video");
+    const scannerCancel = document.getElementById("scanner-cancel");
 
-      let t = String(text).trim().toUpperCase();
+    let scanStream = null;
+    let scanTrack = null;
+    let scanning = false;
+    let scanRafId = null;
+    let lastDecodeTime = 0;
+    const DECODE_INTERVAL = 120;
 
-      // Convert common separators to '-'
-      t = t.replace(/[:\s_]+/g, "-");
+    const scanCanvas = document.createElement("canvas");
+    const scanCtx = scanCanvas.getContext("2d", { willReadFrequently: true });
 
-      // If 8 hex chars with no separators, convert to XX-XX-XX-XX
-      if (/^[0-9A-F]{8}$/.test(t)) {
-        t = t.match(/../g).join("-");
+    let scanEngine = null;
+    let nativeDetector = null;
+    let zxingReader = null;
+    let scanEngineReady = false;
+
+    function normalizeBarcode(raw) {
+      if (!raw) return null;
+      const digits = String(raw).replace(/\D/g, "");
+      if (digits.length !== 8) return null;
+      return digits.replace(/(\d\d)(\d\d)(\d\d)(\d\d)/, "$1-$2-$3-$4");
+    }
+
+    async function initScanEngine() {
+      if (scanEngineReady) return scanEngine !== null;
+      scanEngineReady = true;
+
+      if ("BarcodeDetector" in window) {
+        try {
+          const formats = await window.BarcodeDetector.getSupportedFormats();
+          if (formats.includes("code_128")) {
+            nativeDetector = new window.BarcodeDetector({ formats: ["code_128"] });
+            scanEngine = "native";
+            return true;
+          }
+        } catch (e) { /* fall through */ }
       }
 
-      // If it looks like 4 groups of 2 hex, normalize
-      const parts = t.split("-").filter(Boolean);
-      if (parts.length === 4 && parts.every(p => /^[0-9A-F]{2}$/.test(p))) {
-        t = parts.join("-");
+      if (window.ZXing) {
+        const hints = new Map();
+        hints.set(ZXing.DecodeHintType.POSSIBLE_FORMATS, [ZXing.BarcodeFormat.CODE_128]);
+        hints.set(ZXing.DecodeHintType.TRY_HARDER, true);
+        zxingReader = new ZXing.MultiFormatReader();
+        zxingReader.setHints(hints);
+        scanEngine = "zxing";
+        return true;
       }
 
-      return t;
+      scanEngine = null;
+      return false;
     }
 
-    function isValidDeviceId(t) {
-      return /^[0-9A-F]{2}(-[0-9A-F]{2}){3}$/.test(t);
+    async function startScanCamera() {
+      try {
+        scanStream = await navigator.mediaDevices.getUserMedia({
+          video: {
+            facingMode: { ideal: "environment" },
+            width: { ideal: 1280 },
+            height: { ideal: 720 },
+            focusMode: "continuous"
+          },
+          audio: false
+        });
+      } catch (err) {
+        handleScanCameraError(err);
+        return false;
+      }
+
+      scannerVideo.srcObject = scanStream;
+      await scannerVideo.play().catch(() => {});
+      scanTrack = scanStream.getVideoTracks()[0];
+      return true;
     }
 
-    function makeMiniBtn(label, kind, onClick) {
-      const btn = document.createElement("button");
-      btn.className = `btn mini ${kind}`;
-      btn.textContent = label;
-      btn.onclick = onClick;
-      return btn;
+    function stopScanCamera() {
+      if (scanRafId) cancelAnimationFrame(scanRafId);
+      scanRafId = null;
+      scanning = false;
+      if (scanStream) scanStream.getTracks().forEach(t => t.stop());
+      scanStream = null;
+      scanTrack = null;
+      scannerVideo.srcObject = null;
     }
 
-    function onAction(id, n) {
-      // Placeholder for later: API call, WebSocket emit, etc.
-      toastInfo(`Clicked Action ${n} for ${id}`);
+    function handleScanCameraError(err) {
+      let msg;
+      if (err && (err.name === "NotAllowedError" || err.name === "SecurityError")) {
+        msg = "Camera access was blocked. Allow camera permission for this page, then try again. The page must be served over HTTPS.";
+      } else if (err && err.name === "NotFoundError") {
+        msg = "No camera found on this device.";
+      } else {
+        msg = "Could not start the camera. Serve this page over HTTPS or localhost and try again.";
+      }
+      toastErr(msg);
+      closeScannerOverlay();
     }
 
+    function drawCropToCanvas() {
+      const vw = scannerVideo.videoWidth;
+      const vh = scannerVideo.videoHeight;
+      if (!vw || !vh) return false;
+      const cropW = Math.round(vw * 0.82);
+      const cropH = Math.round(cropW / 2.6);
+      const sx = Math.round((vw - cropW) / 2);
+      const sy = Math.round((vh - cropH) / 2);
+      if (scanCanvas.width !== cropW || scanCanvas.height !== cropH) {
+        scanCanvas.width = cropW;
+        scanCanvas.height = cropH;
+      }
+      scanCtx.drawImage(scannerVideo, sx, sy, cropW, cropH, 0, 0, cropW, cropH);
+      return true;
+    }
+
+    function handleDecodedBarcode(text) {
+      const id = normalizeBarcode(text);
+      if (!id) return;
+      if (accepted.has(id) || pendingQueue.includes(id)) return;
+      enqueueForConfirm(id);
+      toastOk(`Queued ${id}`);
+      if (navigator.vibrate) navigator.vibrate(40);
+    }
+
+    async function scanTick(now) {
+      if (!scanning) return;
+      scanRafId = requestAnimationFrame(scanTick);
+
+      if (now - lastDecodeTime < DECODE_INTERVAL) return;
+      lastDecodeTime = now;
+
+      if (!drawCropToCanvas()) return;
+
+      let text = null;
+      try {
+        if (scanEngine === "native") {
+          const codes = await nativeDetector.detect(scanCanvas);
+          if (codes && codes.length) text = codes[0].rawValue;
+        } else if (scanEngine === "zxing") {
+          const lum = new ZXing.HTMLCanvasElementLuminanceSource(scanCanvas);
+          const bitmap = new ZXing.BinaryBitmap(new ZXing.HybridBinarizer(lum));
+          try {
+            const res = zxingReader.decode(bitmap);
+            text = res ? res.getText() : null;
+          } catch (e) { /* no barcode this frame */ }
+          finally { zxingReader.reset(); }
+        }
+      } catch (e) { /* keep scanning */ }
+
+      if (text) handleDecodedBarcode(text);
+    }
+
+    function closeScannerOverlay() {
+      stopScanCamera();
+      scannerOverlay.style.display = "none";
+    }
+
+    async function openScannerOverlay() {
+      const ok = await initScanEngine();
+      if (!ok) {
+        toastErr("Barcode scanner unavailable in this browser.");
+        return;
+      }
+
+      scannerOverlay.style.display = "flex";
+      const camOk = await startScanCamera();
+      if (!camOk) return;
+
+      scanning = true;
+      lastDecodeTime = 0;
+      scanRafId = requestAnimationFrame(scanTick);
+    }
+
+    scannerCancel.addEventListener("click", () => {
+      closeScannerOverlay();
+      if (pendingQueue.length) processQueue();
+    });
+
+    window.addEventListener("pagehide", stopScanCamera);
+
     // -------------------------------------------------------------------------
     // Confirm modal (queue-based)
     // -------------------------------------------------------------------------
@@ -2796,55 +2927,8 @@
     // -------------------------------------------------------------------------
     // Buttons
     // -------------------------------------------------------------------------
-    document.getElementById("btn-scan").onclick = async () => {
-      try {
-        const config = new ScanbotSDK.UI.Config.BarcodeScannerScreenConfiguration();
-
-        // Depending on Scanbot version/features, you may be able to restrict formats here.
-        // Example (pseudo): config.barcodeFormats = [ScanbotSDK.BarcodeFormat.CODE_128, ...];
-
-        const result = await ScanbotSDK.UI.createBarcodeScanner(config);
-
-        const items = result?.items ?? [];
-        if (!items.length) {
-          toastErr("No barcodes found.");
-          return;
-        }
-
-        let valid = 0;
-        let invalid = 0;
-        let duplicates = 0;
-
-        for (const item of items) {
-          const raw = item?.barcode?.text ?? "";
-          const norm = normalizeCandidate(raw);
-
-          if (!norm || !isValidDeviceId(norm)) {
-            invalid++;
-            continue;
-          }
-
-          if (accepted.has(norm) || pendingQueue.includes(norm)) {
-            duplicates++;
-            continue;
-          }
-
-          enqueueForConfirm(norm);
-          valid++;
-        }
-
-        if (valid === 0) {
-          toastErr(`No valid device IDs found. Invalid: ${invalid}, duplicates: ${duplicates}.`);
-          return;
-        }
-
-        toastOk(`Found ${valid} valid device ID(s). Confirming…`);
-        processQueue();
-
-      } catch (err) {
-        console.error(err);
-        toastErr("Scanner error. Check console for details.");
-      }
+    document.getElementById("btn-scan").onclick = () => {
+      openScannerOverlay();
     };
 
   </script>