getData.kt

/**
 * Use this if you need to cache data after fetching it from the api, or retrieve something from cache
 */

inline fun <T : RoomMapper<R>, R : DomainMapper<U>, U : Any> Response<T>.getData(
    cacheAction: (R) -> Unit,
    fetchFromCacheAction: () -> R): Result<U> {
  try {
    onSuccess {
      val databaseEntity = it.mapToRoomEntity()
      cacheAction(databaseEntity)
      return Success(databaseEntity.mapToDomainModel())
    }
    onFailure {
      val cachedModel = fetchFromCacheAction()
      if (cachedModel != null) Success(cachedModel.mapToDomainModel()) else Failure(HttpError(Throwable(DB_ENTRY_ERROR)))
    }
    return Failure(HttpError(Throwable(GENERAL_NETWORK_ERROR)))
  } catch (e: IOException) {
    return Failure(HttpError(Throwable(GENERAL_NETWORK_ERROR)))
  }
}

/**
 * Use this when communicating only with the api service
 */
fun <T : DomainMapper<R>, R : Any> Response<T>.getData(): Result<R> {
  try {
    onSuccess { return Success(it.mapToDomainModel()) }
    onFailure { return Failure(it) }
    return Failure(HttpError(Throwable(GENERAL_NETWORK_ERROR)))
  } catch (e: IOException) {
    return Failure(HttpError(Throwable(GENERAL_NETWORK_ERROR)))
  }
}