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#' Download spatial data of Brazilian states
#'
#' @description
#' Data at scale 1:250,000, using Geodetic reference system "SIRGAS2000" and CRS(4674)
#'
#' @param year Numeric. Year of the data in YYYY format. Defaults to `2010`.
#' @param code_state The two-digit code of a state or a two-letter uppercase
#' abbreviation (e.g. 33 or "RJ"). If `code_state="all"` (the
#' default), the function downloads all states.
#' @template simplified
#' @template showProgress
#' @template cache
#'
#'
#' @return An `"sf" "data.frame"` object
#'
#' @export
#' @family area functions
#'
#' @examplesIf identical(tolower(Sys.getenv("NOT_CRAN")), "true")
#' # Read specific state at a given year
#' uf <- read_state(code_state=12, year=2017)
#'
#' # Read specific state at a given year
#' uf <- read_state(code_state="SC", year=2000)
#'
#' # Read all states at a given year
#' ufs <- read_state(code_state="all", year=2010)
#'
read_state <- function(code_state = "all",
year = 2010,
simplified = TRUE,
showProgress = TRUE,
cache = TRUE){
# Get metadata with data url addresses
temp_meta <- select_metadata(geography="state", year=year, simplified=simplified)
# check if metadata download failed
if (is.null(temp_meta)) { return(invisible(NULL)) }
# check code_state exists in metadata
if (!any(code_state == 'all' |
code_state %in% temp_meta$code |
code_state %in% temp_meta$code_abbrev |
(year < 1992 & temp_meta$code == "st")
)) {
stop("Error: Invalid Value to argument code_state.")
}
# get file url
if (code_state=="all" | year < 1992) {
file_url <- as.character(temp_meta$download_path)
} else if (is.numeric(code_state)) { # if using numeric code_state
file_url <- as.character(subset(temp_meta, code==substr(code_state, 1, 2))$download_path)
} else if (is.character(code_state)) { # if using chacracter code_abbrev
file_url <- as.character(subset(temp_meta, code_abbrev==substr(code_state, 1, 2))$download_path)
}
# download gpkg
temp_sf <- download_gpkg(file_url = file_url,
showProgress = showProgress,
cache = cache)
# check if download failed
if (is.null(temp_sf)) { return(invisible(NULL)) }
## FILTERS
y <- code_state
# input "all" & data files before 1992 do not have state code nor state abbrev
if (year < 1992 | code_state=="all") {
# abbrev_state
} else if(code_state %in% temp_sf$abbrev_state){
temp_sf <- subset(temp_sf, abbrev_state == y)
# code_state
} else if(code_state %in% temp_sf$code_state){
temp_sf <- subset(temp_sf, code_state == y)
} else {stop(paste0("Error: Invalid Value to argument 'read_state'",collapse = " "))}
return(temp_sf)
}
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