#' @title CostTransport
#' @description reads costs entering the objective function from a MAgPIE gdx file
#'
#' @export
#'
#' @param gdx GDX file
#' @param file a file name the output should be written to using write.magpie
#' @param level Level of regional aggregation; "reg" (regional), "glo" (global), "regglo" (regional and global) or any other aggregation level defined in superAggregate
#' @param sum total costs (TRUE) or detailed costs (FALSE)
#' @return A MAgPIE object containing the transport costs [million US$05]
#' @author David Chen
#' @importFrom gdx readGDX out
#' @importFrom magclass dimSums
#' @importFrom luscale superAggregate
#' @examples
#'
#' \dontrun{
#' x <- CostTransport(gdx)
#' }
#'
CostTransport <- function(gdx,file=NULL,level="cell",sum=FALSE){
#delete Mainsolve also in magpie4 costs
transport <-readGDX(gdx,"ov_cost_transp",react="silent",format="first_found", select = list(type="level"))
if (sum){
transport <- dimSums(transport,dim=3.1)
dimnames(transport)[[3]] <- "Transport"
}
if (level != "cell") transport <- superAggregate(transport, aggr_type = "sum", level = level)
out(transport,file)
}
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