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#' Download spatial data of historically comparable municipalities
#'
#' @description
#' This function downloads the shape file of minimum comparable area of
#' municipalities, known in Portuguese as 'Areas minimas comparaveis (AMCs)'.
#' The data is available for any combination of census years between 1872-2010.
#' These data sets are generated based on the Stata code originally developed by
#' Ehrl (2017) \doi{10.1590/0101-416147182phe}, and translated into `R` by the
#' `geobr` team.
#'
#' @param start_year Numeric. Start year to the period in the YYYY format.
#' Defaults TO `1970`.
#' @param end_year Numeric. End year to the period in the YYYY format. Defaults
#' to `2010`.
#' @template simplified
#' @template showProgress
#'
#' @return An `"sf" "data.frame"` object
#'
#' @details
#' These data sets are generated based on the original Stata code developed by
#' Philipp Ehrl. If you use these data, please cite:
#' - Ehrl, P. (2017). Minimum comparable areas for the period 1872-2010: an
#' aggregation of Brazilian municipalities. Estudos Econômicos (São Paulo),
#' 47(1), 215-229. https://doi.org/10.1590/0101-416147182phe
#'
#' @export
#' @family area functions
#'
#' @examplesIf identical(tolower(Sys.getenv("NOT_CRAN")), "true")
#' amc <- read_comparable_areas(start_year=1970, end_year=2010)
#'
read_comparable_areas <- function(start_year=1970, end_year=2010, simplified=TRUE, showProgress=TRUE){
# tests
years_available <- c(1872,1900,1911,1920,1933,1940,1950,1960,1970,1980,1991,2000,2010)
if( !(start_year %in% years_available) ){ stop(paste0("Invalid 'start_year'. It must be one of the following: ",
paste(years_available, collapse = " "))) }
if( !(end_year %in% years_available) ){ stop(paste0("Invalid 'end_year'. It must be one of the following: ",
paste(years_available, collapse = " "))) }
if( end_year <= start_year){ stop(paste0("start_year must be smaller than end_year")) }
# Get metadata with data url addresses
temp_meta <- select_metadata(geography="amc", year=start_year, simplified=simplified)
# list paths of files to download
file_url <- as.character(temp_meta$download_path)
# subset based on end_year
target_year <- paste0(start_year, '_', end_year)
file_url <- file_url[ file_url %like% target_year]
# download files
temp_sf <- download_gpkg(file_url, progress_bar = showProgress)
# check if download failed
if (is.null(temp_sf)) { return(invisible(NULL)) }
return(temp_sf)
}
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