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#' Make request to Zillow API GetDeepComps Web Service
#'
#' The GetDeepComps API returns a list of comparable recent sales for a
#' specified property. The result set returned contains the address, Zillow
#' property identifier, and Zestimate for the comparable properties and the
#' principal property for which the comparables are being retrieved. This API
#' call also returns rich property data for the comparables.
#'
#' @param zpid The Zillow Property ID for the property for which to obtain
#' information. Required.
#' @param count The number of comparable recent sales to obtain (between 1 and
#' 25)
#' @param rentzestimate Return Rent Zestimate information if available (logical,
#' default: false).
#' @param zws_id The Zillow Web Service Identifier. Required.
#' @param url URL for the GetDeepComps Web Service. Required.
#'
#' @return A named list with the following elements:
#' \describe{
#' \item{\strong{request}}{a list with the request parameters}
#' \item{\strong{message}}{a list of status code(s) and message(s)
#' returned by the API}
#' \item{\strong{response}}{an XMLNode with the API-specific response
#' values. At this time, no further coercion is performed, so you
#' may have to use functions from the `XML` package to extract
#' the desired output.}
#' }
#'
#' @export
#' @importFrom RCurl getURL
#'
#' @examples
#' \dontrun{
#' GetDeepComps(zpid = 48749425, count = 5)
#' GetDeepComps(zpid = 48749425, count = 5, rentzestimate = TRUE)}
GetDeepComps <- function(
zpid = NULL, count = NULL,
rentzestimate = FALSE,
zws_id = getOption('ZillowR-zws_id'),
url = 'http://www.zillow.com/webservice/GetDeepComps.htm'
) {
validation_errors <- c(
validate_arg(zpid, required = TRUE, format = '^\\d+$', length_min = 1, length_max = 1),
validate_arg(count, required = TRUE, inclusion = 1:25, length_min = 1, length_max = 1),
validate_arg(rentzestimate, inclusion = c(FALSE, TRUE), length_min = 1, length_max = 1),
validate_arg(zws_id, required = TRUE, class = 'character', length_min = 1, length_max = 1),
validate_arg(url, required = TRUE, class = 'character', length_min = 1, length_max = 1)
)
if (length(validation_errors) > 0) {
stop(paste(validation_errors, collapse = '\n'))
}
request <- url_encode_request(url,
'zpid' = zpid,
'count' = count,
'rentzestimate' = rentzestimate,
'zws-id' = zws_id
)
response <- tryCatch(
RCurl::getURL(request),
error = function(e) {stop(sprintf("Zillow API call with request '%s' failed with %s", request, e))}
)
return(preprocess_response(response))
}
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