FactoryAndInjection.kt

@Module
object RemoteModule {

  @Provides
  @JvmStatic
  fun provideService(): Service = ServiceFactory.getService(BuildConfig.DEBUG)
}

object ServiceFactory {

  private val baseUrl: String = "https://service.com/"

  fun getService(isDebug: Boolean): Service {
    return buildService(
        buildOkHttpClient(
            buildLoggingInterceptor(isDebug)
        ),
        buildMoshiConverterFactory()
    )
  }

  private fun buildService(
      okHttpClient: OkHttpClient,
      moshiConverterFactory: MoshiConverterFactory
  ): Service {
    return Retrofit.Builder()
        .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
        .addConverterFactory(moshiConverterFactory)
        .baseUrl(baseUrl)
        .client(okHttpClient)
        .build()
        .create(Service::class.java)
  }

  private fun buildOkHttpClient(loggingInterceptor: HttpLoggingInterceptor): OkHttpClient =
      OkHttpClient.Builder().apply {
        addInterceptor(loggingInterceptor)
      }.build()

  private fun buildMoshiConverterFactory(): MoshiConverterFactory {
    val moshi = Moshi.Builder()
        .add(Date::class.java, Rfc3339DateJsonAdapter())
        .add(KotlinJsonAdapterFactory())
        .build()
    return MoshiConverterFactory.create(moshi)
  }

  private fun buildLoggingInterceptor(isDebug: Boolean): HttpLoggingInterceptor =
      HttpLoggingInterceptor().setLevel(
          if (isDebug) HttpLoggingInterceptor.Level.BODY else HttpLoggingInterceptor.Level.NONE
      )
}