initial code

src/utils/storage.ts

@@ -0,0 +1,41 @@
+const STORAGE_KEY = "devices";
+const MERCHANT_KEY = "merchant";
+
+export function getDevices(): DeviceData[] {
+  try {
+    return JSON.parse(localStorage.getItem(STORAGE_KEY) || "[]");
+  } catch {
+    return [];
+  }
+}
+
+export function saveDevices(devices: DeviceData[]) {
+  localStorage.setItem(STORAGE_KEY, JSON.stringify(devices));
+}
+
+export function isDuplicateDevice(
+  devices: DeviceData[],
+  newDevice: DeviceData
+) {
+  return devices.some(d =>
+    d.towerNumber === newDevice.towerNumber &&
+    d.floorName === newDevice.floorName &&
+    d.unitNumber === newDevice.unitNumber &&
+    d.roomName === newDevice.roomName &&
+    d.code === newDevice.code &&
+    d.deviceType === newDevice.deviceType
+  );
+}
+
+
+export function getMerchant(): string {
+  try {
+    return JSON.parse(localStorage.getItem(MERCHANT_KEY) || "");
+  } catch {
+    return '';
+  }
+}
+
+export function saveMerchant(val: string) {
+  localStorage.setItem(MERCHANT_KEY, JSON.stringify(val));
+}