#' PostgreSQL - Automatic ESRI shp file import into postgis table
#' @details ESRI shape failide automaatne importimine postgis tabeliks. Eelnevalt peab olema loodud postgis andmebaas
#' \code{\link{myPostgresCreateGisDb}} ja defineeritud tabeli nimi. Andmed salvestatakse WGS4326 projektsioonis.
#'     Kui parameeter 'shp' on määramata, siis tuleb *.shp fail valida failide kataloogist.
#' @param host Name or the numeric IPaddress of the host to connect to.
#' @param dbname The database name.
#' @param user PostgreSQL user name to connect as. Defaults to be the same as the operating system name of the user running the application.
#' @param password Password to be used if the server demands password authentication.
#' @param port Port number to connect to at the server host.
#' @param shpFile ESRI shp file.
#' @param tbl Postgis table name.
#' @return return message.
#' @seealso \code{\link{myPostgresConnect}}, \code{\link{myPostgresDropTable}},
#' \code{\link{myPostgresCreateGisDb}}, \code{\link{myPostgresImprotShp}}
#' @examples \dontrun{
#' myPostgresImprotShp(host = '192.168.255.26', port = 5432,
#'        user = 'osm', password = 'osm', shpFile = NULL, dbname = 'xxxxx', tbl = 'table_xxx')
#'
#' }
#'
#' @export
#'

myPostgresImprotShp <- function(host = '192.168.255.26', port = 5432, user = 'osm', password = 'osm', dbname = 'shp',
                                shpFile = NULL, tbl = NULL) {
  '%>%' <- magrittr::`%>%`
  if(is.null(tbl)) {message("Postgis tabeli nimi on puudu!"); return(NULL)}
  if(is.null(shpFile) || !file.exists(shpFile)) shpFile <- file.choose()
  system(paste0("shp2pgsql -s 4326 -I '", shpFile, "' ", tbl, " > /tmp/tmp.sql"))
  queries <- readLines("/tmp/tmp.sql")
  # class(queries)
  # Ühe tekstmuutuja moodustamine
  d0 = paste(queries,collapse=" ")
  # Tekstmuutuja jagamine osadeks semikooloni järele.
  d1 = strsplit(d0, split = ";", fixed = TRUE) %>% unlist()
  # semikooloni lisamine veeru lõppu
  d2 = paste(paste0(d1, ";"))
  write(d2, file = "/tmp/tmp1.sql")
  system(paste0("export PGPASSWORD='", password, "' && psql -U ", user, " -d ", dbname, " -h ", host, " -p ", port, " -f /tmp/tmp1.sql"))
  message("Shp faili importimine postgis andmebaasi lopetati.")
}