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#' Trait metadata
#'
#' Retrieve metadata of the functional traits coming from GIFT.
#'
#' @param api Character string corresponding to the API.
#'
#' @param GIFT_version character string defining the version of the GIFT
#' database to use. The function retrieves by default the most up-to-date
#' version.
#'
#' @return A data frame with 10 columns.
#'
#' @details Here is what each column refers to:
#'
#' \emph{Lvl1} - First level of the trait classification\cr
#' \emph{Category} - Name of the first level of classification\cr
#' \emph{Lvl2} - Second level of the trait classification\cr
#' \emph{Trait1} - Name of the second level of classification\cr
#' \emph{Lvl3} - Identification number of the trait\cr
#' \emph{Trait2} - Trait name\cr
#' \emph{Units} - Trait unit\cr
#' \emph{type} - Trait type\cr
#' \emph{comment} - Comment\cr
#' \emph{count} - How many entries for that traits are in the database
#'
#' @references
#' Denelle, P., Weigelt, P., & Kreft, H. (2023). GIFT—An R package to
#' access the Global Inventory of Floras and Traits. Methods in Ecology
#' and Evolution, 14, 2738-2748.
#' https://doi.org/10.1111/2041-210X.14213
#'
#' Weigelt, P, König, C, Kreft, H. GIFT – A Global Inventory of Floras and
#' Traits for macroecology and biogeography. J Biogeogr. 2020; 47: 16– 43.
#' https://doi.org/10.1111/jbi.13623
#'
#' @seealso [GIFT::GIFT_traits()]
#'
#' @examples
#' \donttest{
#' ex <- GIFT_traits_meta()
#' }
#'
#' @importFrom jsonlite read_json
#'
#' @export
GIFT_traits_meta <- function(
api = "https://gift.uni-goettingen.de/api/extended/",
GIFT_version = "latest"){
api_check <- check_api(api)
if(is.null(api_check)){
return(NULL)
} else{
GIFT_version <- check_gift_version(GIFT_version)
tmp <- jsonlite::read_json(
paste0(api, "index", ifelse(GIFT_version == "beta", "", GIFT_version),
".php?query=traits_meta"), simplifyVector = TRUE)
tmp$count <- as.numeric(tmp$count)
return(tmp)
}
}
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