Bluetooth handling in FixApp

Bluetooth.kt

package com.fixdapp.android

import android.bluetooth.BluetoothDevice

/* Interfaces */
data class ErrorCode(val code: String)

interface SensorService {
    fun scanForSensors(): List<Sensor>
    fun connectToSensor(sensor: Sensor): DiagnosticInterface
}

interface Sensor {
    val name: String
    val macAddress: String
}

interface DiagnosticInterface {
    fun readCodes(): List<ErrorCode>
}

/* Real Implementations */
class BluetoothSensor(private val bluetoothDevice: BluetoothDevice): Sensor {
    override val name: String
        get() = bluetoothDevice.name
    override val macAddress: String
        get() = bluetoothDevice.address
}

class BluetoothSensorService : SensorService {
    override fun scanForSensors(): List<BluetoothSensor> {
        TODO("Android OS implementation")
    }
    override fun connectToSensor(sensor: Sensor): DiagnosticInterface {
        sensor as BluetoothSensor
        TODO("Android OS implementation")
    }
}

class BluetoothDiagosticInterface(private val sensor: BluetoothSensor) : DiagnosticInterface {
    override fun readCodes(): List<ErrorCode> {
        TODO("Android OS implementation")
    }
}

/* Mock Implementations */
object MockSensor : Sensor {
    override val name = "MOCK"
    override val macAddress = "AA:BB:CC:DD:EE:FF"
}

class MockSensorService : SensorService {
    override fun scanForSensors(): List<Sensor> = listOf(MockSensor)
    override fun connectToSensor(sensor: Sensor): DiagnosticInterface = MockDiagnosticInterface()
}

class MockDiagnosticInterface : DiagnosticInterface {
    override fun readCodes(): List<ErrorCode> = listOf(ErrorCode("P0100"))
}

/* Dependency Injection */
object SensorServiceProvider {
    fun getSensorService(): SensorService {
        return if (BuildConfig.TEST_MODE) {
            MockSensorService()
        } else {
            BluetoothSensorService()
        }
    }
}