refactor: update WeightScaleBridge integration and error handling

android/src/main/AndroidManifest.xml

@@ -1,2 +1,14 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
+  <uses-permission android:name="android.permission.BLUETOOTH" />
+  <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+  <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+  <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
+  <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+  <uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />
+  <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />
+  <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />
 </manifest>

android/src/main/java/com/weightscalebridge/WeightScaleBridgeModule.kt

@@ -1,23 +1,193 @@
 package com.weightscalebridge
 
-import com.facebook.react.bridge.ReactApplicationContext
-import com.facebook.react.module.annotations.ReactModule
+import android.Manifest
+import android.bluetooth.BluetoothAdapter
+import android.bluetooth.BluetoothManager
+import android.bluetooth.le.BluetoothLeScanner
+import android.bluetooth.le.ScanCallback
+import android.bluetooth.le.ScanResult
+import android.content.Context
+import android.content.pm.PackageManager
+import android.os.Build
+import android.os.CountDownTimer
+import androidx.core.content.ContextCompat
+import com.facebook.react.bridge.*
+import com.facebook.react.modules.core.DeviceEventManagerModule
+import kotlin.math.pow
+import kotlin.math.round
 
-@ReactModule(name = WeightScaleBridgeModule.NAME)
-class WeightScaleBridgeModule(reactContext: ReactApplicationContext) :
-  NativeWeightScaleBridgeSpec(reactContext) {
+class WeightScaleModule(
+  private val reactContext: ReactApplicationContext
+) : ReactContextBaseJavaModule(reactContext) {
 
-  override fun getName(): String {
-    return NAME
+  private var bluetoothAdapter: BluetoothAdapter? = null
+  private var scanner: BluetoothLeScanner? = null
+  private var isScanning = false
+  private var timer: CountDownTimer? = null
+  private var currentWeight = 0.0
+
+  override fun getName(): String = "WeightScaleBridge"
+
+  init {
+    val manager =
+      reactContext.getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
+    bluetoothAdapter = manager.adapter
+    scanner = bluetoothAdapter?.bluetoothLeScanner
   }
 
-  // Example method
-  // See https://reactnative.dev/docs/native-modules-android
-  override fun multiply(a: Double, b: Double): Double {
-    return a * b
+  private fun sendEvent(name: String, params: WritableMap?) {
+    reactContext
+      .getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter::class.java)
+      .emit(name, params)
   }
 
-  companion object {
-    const val NAME = "WeightScaleBridge"
+  @ReactMethod
+  fun isBluetoothEnabled(promise: Promise) {
+    try {
+      val enabled = bluetoothAdapter?.isEnabled ?: false
+      promise.resolve(enabled)
+    } catch (e: Exception) {
+      promise.reject("BLUETOOTH_CHECK_ERROR", e.message, e)
+    }
+  }
+
+  @ReactMethod
+  fun startScanning(promise: Promise) {
+    try {
+      if (!hasPermissions()) {
+        promise.reject("PERMISSION", "Bluetooth permissions not granted")
+        return
+      }
+
+      if (bluetoothAdapter?.isEnabled != true) {
+        promise.reject("BLUETOOTH", "Bluetooth disabled")
+        return
+      }
+
+      if (isScanning) {
+        promise.resolve(true)
+        return
+      }
+
+      isScanning = true
+      currentWeight = 0.0
+
+      scanner?.startScan(scanCallback)
+
+      sendEvent(
+        "onWeightScaleStatus",
+        Arguments.createMap().apply { putString("status", "scanning") }
+      )
+
+      timer = object : CountDownTimer(20000, 1000) {
+        override fun onTick(ms: Long) {}
+        override fun onFinish() {
+          stopScanning(null)
+        }
+      }.start()
+
+      promise.resolve(true)
+    } catch (e: Exception) {
+      promise.reject("SCAN_ERROR", e.message, e)
+    }
+  }
+
+  @ReactMethod
+  fun stopScanning(promise: Promise?) {
+    try {
+      scanner?.stopScan(scanCallback)
+    } catch (_: Exception) {}
+
+    timer?.cancel()
+    isScanning = false
+
+    sendEvent(
+      "onWeightScaleStatus",
+      Arguments.createMap().apply { putString("status", "stopped") }
+    )
+
+    promise?.resolve(true)
+  }
+
+  private val scanCallback = object : ScanCallback() {
+    override fun onScanResult(type: Int, result: ScanResult) {
+      val record = result.scanRecord ?: return
+      val data = record.manufacturerSpecificData
+
+      if (data.size() == 0) return
+
+      val raw = data.valueAt(0)
+      if (raw.size < 2) return
+
+      val weight = (((raw[0].toInt() and 0xff) shl 8) or
+        (raw[1].toInt() and 0xff)) / 10.0
+
+      currentWeight = weight
+
+      sendEvent(
+        "onWeightData",
+        Arguments.createMap().apply {
+          putDouble("weight", weight)
+          putBoolean("isStable", true)
+        }
+      )
+
+      sendEvent(
+        "onWeightScaleStatus",
+        Arguments.createMap().apply {
+          putString("status", "complete")
+          putString("message", "$weight kg")
+        }
+      )
+
+      stopScanning(null)
+    }
+
+    override fun onScanFailed(errorCode: Int) {
+      super.onScanFailed(errorCode)
+      
+      sendEvent(
+        "onWeightScaleStatus",
+        Arguments.createMap().apply {
+          putString("status", "error")
+          putString("message", "Scan failed with code: $errorCode")
+        }
+      )
+      
+      isScanning = false
+    }
+  }
+
+  @ReactMethod
+  fun calculateBMI(weight: Double, heightCm: Double, promise: Promise) {
+    try {
+      if (heightCm <= 0) {
+        promise.reject("INVALID_HEIGHT", "Height must be greater than 0")
+        return
+      }
+      
+      val bmi = weight / (heightCm / 100).pow(2)
+      promise.resolve(round(bmi * 10) / 10)
+    } catch (e: Exception) {
+      promise.reject("BMI_ERROR", e.message, e)
+    }
+  }
+
+  private fun hasPermissions(): Boolean {
+    val perms =
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S)
+        arrayOf(
+          Manifest.permission.BLUETOOTH_SCAN,
+          Manifest.permission.BLUETOOTH_CONNECT
+        )
+      else
+        arrayOf(
+          Manifest.permission.ACCESS_FINE_LOCATION
+        )
+
+    return perms.all {
+      ContextCompat.checkSelfPermission(reactContext, it) ==
+        PackageManager.PERMISSION_GRANTED
+    }
   }
 }

android/src/main/java/com/weightscalebridge/WeightScaleBridgePackage.kt

@@ -1,33 +1,19 @@
 package com.weightscalebridge
 
-import com.facebook.react.BaseReactPackage
+import com.facebook.react.ReactPackage
 import com.facebook.react.bridge.NativeModule
 import com.facebook.react.bridge.ReactApplicationContext
-import com.facebook.react.module.model.ReactModuleInfo
-import com.facebook.react.module.model.ReactModuleInfoProvider
-import java.util.HashMap
+import com.facebook.react.uimanager.ViewManager
 
-class WeightScaleBridgePackage : BaseReactPackage() {
-  override fun getModule(name: String, reactContext: ReactApplicationContext): NativeModule? {
-    return if (name == WeightScaleBridgeModule.NAME) {
-      WeightScaleBridgeModule(reactContext)
-    } else {
-      null
-    }
+class WeightScaleBridgePackage : ReactPackage {
+
+  override fun createNativeModules(
+    reactContext: ReactApplicationContext
+  ): List<NativeModule> {
+    return listOf(WeightScaleModule(reactContext))
   }
 
-  override fun getReactModuleInfoProvider(): ReactModuleInfoProvider {
-    return ReactModuleInfoProvider {
-      val moduleInfos: MutableMap<String, ReactModuleInfo> = HashMap()
-      moduleInfos[WeightScaleBridgeModule.NAME] = ReactModuleInfo(
-        WeightScaleBridgeModule.NAME,
-        WeightScaleBridgeModule.NAME,
-        false,  // canOverrideExistingModule
-        false,  // needsEagerInit
-        false,  // isCxxModule
-        true // isTurboModule
-      )
-      moduleInfos
-    }
-  }
+  override fun createViewManagers(
+    reactContext: ReactApplicationContext
+  ): List<ViewManager<*, *>> = emptyList()
 }

src/index.tsx

@@ -1,5 +1,26 @@
-import WeightScaleBridge from './NativeWeightScaleBridge';
+import { NativeModules, Platform } from 'react-native';
 
-export function multiply(a: number, b: number): number {
-  return WeightScaleBridge.multiply(a, b);
+const LINKING_ERROR =
+  `The package 'react-native-weight-scale-bridge' doesn't seem to be linked. Make sure:\n\n` +
+  Platform.select({ ios: "- You have run 'pod install'\n", default: '' }) +
+  '- You rebuilt the app after installing the package\n' +
+  '- You are not using Expo Go\n';
+
+// Changed to match the native module name
+const WeightScaleBridge = NativeModules.WeightScaleBridge;
+
+if (!WeightScaleBridge) {
+  throw new Error(LINKING_ERROR);
 }
+
+export const startScanning = () =>
+  WeightScaleBridge.startScanning();
+
+export const stopScanning = () =>
+  WeightScaleBridge.stopScanning();
+
+export const calculateBMI = (weight: number, heightCm: number) =>
+  WeightScaleBridge.calculateBMI(weight, heightCm);
+
+export const isBluetoothEnabled = () =>
+  WeightScaleBridge.isBluetoothEnabled();