refactor: add stream based methods in BluetoothService to handle bl…

…uetooth operations

lib/services/bluetooth_service.dart

@@ -1,17 +1,21 @@
 import 'package:flutter_bluetooth_serial/flutter_bluetooth_serial.dart';
 
 abstract interface class IBluetoothService {
-  Stream<BluetoothDiscoveryResult> startDiscovery();
+  Future<bool?> isEnabled();
+
+  Future<void> cancelDiscovery();
 
-  Future<List<BluetoothDevice>> fetchPairedDevices();
+  Future<bool?> enableBluetoothAdapter();
 
-  Future<bool?> enableBluetooth();
+  Stream<BluetoothState> onAdapterStateChanges();
 
-  Future<bool?> isEnabled();
+  Future<List<BluetoothDevice>> getPairedDevices();
+
+  Stream<BluetoothDiscoveryResult> startDiscovery();
 
   Future<bool?> bondDevice(BluetoothDevice device);
 
-  Future<void> cancelDiscovery();
+  Future<BluetoothConnection> establishConnectionTo(BluetoothDevice device);
 }
 
 class BluetoothService implements IBluetoothService {
@@ -30,22 +34,32 @@ class BluetoothService implements IBluetoothService {
   }
 
   @override
-  Future<List<BluetoothDevice>> fetchPairedDevices() async {
+  Future<List<BluetoothDevice>> getPairedDevices() async {
     return await _bluetooth.getBondedDevices();
   }
 
   @override
-  Future<bool?> bondDevice(BluetoothDevice device) async {
-    return device.isBonded ? true : await _bluetooth.bondDeviceAtAddress(device.address);
-  }
-
-  @override
-  Future<bool?> enableBluetooth() async {
+  Future<bool?> enableBluetoothAdapter() async {
     return await _bluetooth.requestEnable();
   }
 
   @override
   Future<bool?> isEnabled() {
     return _bluetooth.isEnabled;
   }
+
+  @override
+  Stream<BluetoothState> onAdapterStateChanges() {
+    return _bluetooth.onStateChanged();
+  }
+
+  @override
+  Future<bool?> bondDevice(BluetoothDevice device) async {
+    return await _bluetooth.bondDeviceAtAddress(device.address);
+  }
+
+  @override
+  Future<BluetoothConnection> establishConnectionTo(BluetoothDevice device) {
+    return BluetoothConnection.toAddress(device.address);
+  }
 }