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#' Get possible data categories for a particular datasetid, locationid,
#' stationid, etc.
#'
#' Data Categories represent groupings of data types.
#'
#' @export
#' @template datacats
#' @template token
#' @return A `data.frame` for all datasets, or a list of length two,
#' each with a data.frame.
#' @details Note that calls with both startdate and enddate don't seem to
#' work, though specifying one or the other mostly works.
#' @family ncdc
#' @references https://www.ncdc.noaa.gov/cdo-web/webservices/v2
#' @examples \dontrun{
#' ## Limit to 10 results
#' ncdc_datacats(limit=10)
#'
#' ## by datasetid
#' ncdc_datacats(datasetid="ANNUAL")
#' ncdc_datacats(datasetid=c("ANNUAL", "PRECIP_HLY"))
#'
#' ## Single data category
#' ncdc_datacats(datacategoryid="ANNAGR")
#'
#' ## Fetch data categories for a given set of locations
#' ncdc_datacats(locationid='CITY:US390029')
#' ncdc_datacats(locationid=c('CITY:US390029', 'FIPS:37'))
#'
#' ## Data categories for a given date
#' ncdc_datacats(startdate = '2013-10-01')
#'
#' # Get data categories with data for a series of the same parameter arg, in this case
#' # stationid's
#' ncdc_datacats(stationid='COOP:310090')
#' ncdc_datacats(stationid=c('COOP:310090','COOP:310184','COOP:310212'))
#'
#' ## Curl debugging
#' ncdc_datacats(limit=10, verbose = TRUE)
#' }
ncdc_datacats <- function(datasetid=NULL, datacategoryid=NULL, stationid=NULL,
locationid=NULL, startdate=NULL, enddate=NULL, sortfield=NULL, sortorder=NULL,
limit=25, offset=NULL, token=NULL, ...)
{
token <- check_key(token)
path <- "datacategories"
if (!is.null(datacategoryid)) path <- paste(path, "/", datacategoryid,
sep = "")
args <- noaa_compact(list(startdate=startdate, enddate=enddate,
sortfield=sortfield, sortorder=sortorder, limit=limit, offset=offset))
if (!is.null(datasetid)) {
datasetid <- lapply(datasetid, function(x) list(datasetid = x))
}
if (!is.null(stationid)) {
stationid <- lapply(stationid, function(x) list(stationid = x))
}
if (!is.null(locationid)) {
locationid <- lapply(locationid, function(x) list(locationid = x))
}
args <- c(args, datasetid, stationid, locationid)
args <- as.list(unlist(args))
names(args) <- sapply(names(args), function(y) gsub("[0-9+]", "", y),
USE.NAMES = FALSE)
if (length(args) == 0) args <- NULL
tt <- check_response(ncdc_GET(path, args, token, ...))
if (inherits(tt, "character")) {
all <- list(meta = NULL, data = NULL)
} else {
if (!is.null(datacategoryid)) {
dat <- data.frame(tt,stringsAsFactors = FALSE)
all <- list(meta = NULL, data = dat)
} else {
if (inherits(try(tt$results, silent = TRUE), "try-error")) {
all <- list(meta = NULL, data = NULL)
warning("Sorry, no data found")
} else {
dat <- dplyr::bind_rows(lapply(tt$results, function(x)
data.frame(x, stringsAsFactors = FALSE)))
meta <- tt$metadata$resultset
atts <- list(totalCount = meta$count, pageCount = meta$limit,
offset = meta$offset)
all <- list(meta = atts, data = dat)
}
}
}
class(all) <- "ncdc_datacats"
return( all )
}
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