class BluetoothHelper @Inject constructor(private val context: Context) {

    private val bluetoothAdapter = BluetoothAdapter.getDefaultAdapter()

    fun enable(): Boolean = bluetoothAdapter.enable()

    suspend fun findDeviceAddressByNameAsync(nameRegex: Regex): String? {
        val device =
            searchBondedDevice(nameRegex) ?: withTimeoutOrNull(6000L) { discoveryDevice(nameRegex) }

        return device?.address
    }

    private fun searchBondedDevice(nameRegex: Regex): BluetoothDevice? =
        bluetoothAdapter
            .bondedDevices
            .find { it.name.matches(nameRegex) }

    private suspend fun discoveryDevice(nameRegex: Regex) = callbackFlow {
        val discoveryResultReceiver = object : BroadcastReceiver() {
            override fun onReceive(context: Context, intent: Intent) {
                if (intent.action == BluetoothDevice.ACTION_FOUND) {

                    val device: BluetoothDevice =
                        intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE) ?: return

                    if (!isClosedForSend && device.name?.matches(nameRegex) == true) {
                        offer(device)
                        close()
                    }
                }
            }
        }

        context.registerReceiver(
            discoveryResultReceiver,
            IntentFilter(BluetoothDevice.ACTION_FOUND)
        )

        bluetoothAdapter.startDiscovery()

        awaitClose {
            context.unregisterReceiver(discoveryResultReceiver)
            bluetoothAdapter.cancelDiscovery()
        }
    }.catch { Timber.d(it) }
        .first()
}