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#' Filter the eBird data by county
#'
#' Define a filter for the eBird Basic Dataset (EBD) based on a set of
#' counties This function only defines the filter and, once all filters have
#' been defined, [auk_filter()] should be used to call AWK and perform the
#' filtering.
#'
#' @param x `auk_ebd` or `auk_sampling` object; reference to file created by
#' [auk_ebd()] or [auk_sampling()].
#' @param county character; counties to filter by. eBird uses county codes
#' consisting of three parts, the 2-letter ISO country code, a 1-3 character
#' state code, and a county code, all separated by a dash. For example,
#' `"US-NY-109"` corresponds to Tompkins, NY, US. The easiest way to find a
#' county code is to find the corresponding [explore
#' region](https://ebird.org/explore) page and look at the URL.
#' @param replace logical; multiple calls to `auk_county()` are additive,
#' unless `replace = FALSE`, in which case the previous list of states to
#' filter by will be removed and replaced by that in the current call.
#'
#' @details It is not possible to filter by both county as well as country or
#' state, so calling `auk_county()` will reset these filters to all countries
#' and states, and vice versa.
#'
#' This function can also work with on an `auk_sampling` object if the user only
#' wishes to filter the sampling event data.
#'
#' @return An `auk_ebd` object.
#' @export
#' @family filter
#' @examples
#' # choose tompkins county, ny, united states
#' system.file("extdata/ebd-sample.txt", package = "auk") %>%
#' auk_ebd() %>%
#' auk_county("US-NY-109")
#'
#' # alternatively, without pipes
#' ebd <- auk_ebd(system.file("extdata/ebd-sample.txt", package = "auk"))
#' auk_county(ebd, "US-NY-109")
auk_county <- function(x, county, replace = FALSE) {
UseMethod("auk_county")
}
#' @export
auk_county.auk_ebd <- function(x, county, replace = FALSE) {
# checks
assertthat::assert_that(
is.character(county),
assertthat::is.flag(replace)
)
county <- toupper(county)
# add county to filter list
if (replace) {
x$filters$county <- county
} else {
x$filters$county <- c(x$filters$county, county)
}
x$filters$county <- sort(unique(x$filters$county))
x$filters$state <- character()
x$filters$country <- character()
return(x)
}
#' @export
auk_county.auk_sampling <- function(x, county, replace = FALSE) {
auk_county.auk_ebd(x, county, replace)
}
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