UserController.scala

  def updateResourceProgress(state: State, timestamp: Long): State = {
    val secondsSinceLastUpdate = (timestamp - state.metaData.lastUpdate)
    logger.debug(s"secondsSinceLastLogin $secondsSinceLastUpdate")

    val updatedResources: Map[String, Resource] = state.resources.map {
      case (resourceName, resource) => {
        val modifier = resource.productionRate * resource.rateModifier / 1000
        val productionRate = resource.productionRate + modifier
        val addedResources = (productionRate.toFloat / 3600.toFloat * secondsSinceLastUpdate).ceil.toLong
        logger.debug(s"adding $addedResources to $resourceName for $secondsSinceLastUpdate s - ${productionRate}/h")
        (resourceName -> resource.copy(stock = min(resource.stock + addedResources, resource.cap)))
      }
    }
    state.copy(resources = updatedResources).
    	copy(metaData = state.metaData.copy(lastUpdate = (System.currentTimeMillis / 1000)))
  }