#' QGIS-i algoritmi leidmine fraasi järele
#'
#' Funktsioon leiab fraasi järele QGIS-i algoritmid.
#' @param str	string otsitav algoritmi fraas.
#' @return Table found algorithms. Help for the selected algorithm.
#' @return A array of all database schemas.
#' @seealso [qgisprocess::qgis_algorithms()]
#' @keywords qgis, help
#' @export
#' @examples
#' \dontrun{
#'
#' qgis_algorithm_search_by_word(str = "clip")
#' algorithm <- "native:clip"
#' # Read help.
#' qgisprocess::qgis_show_help(algorithm = algorithm)
#'
#' qgis_algorithm_search_by_word(str = "centroid")
#' qgis_algorithm_search_by_word(str = "filedownloader")
#' qgis_algorithm_search_by_word(str = "")
#' qgis_algorithm_search_by_word()
#'
#' }
qgis_algorithm_search_by_word <- function(str = NULL) {
  if (is.null(str) || str == "") {
    return(NULL)
  }
  algs <- qgisprocess::qgis_algorithms(query = FALSE, quiet = TRUE)
  ids <- grep(str, algs$algorithm)
  algs.id <- methods::cbind2(ids, algs[ids, ])
  colnames(algs.id) <- c("id", colnames(algs))
  print(algs.id)
  i <- 1
  # Juhendi näitamine
  if (nrow(algs.id) > 1) {
    while (T) {
      num <- readline(sprintf(
        "Millist juhendit soovid vaadata (%s)? > ",
        paste(seq(1:nrow(algs.id)), collapse = ",")
      ))
      num <- as.numeric(num)
      if (num %in% seq(1:nrow(algs.id))) {
        i <- num
        break
      }
    }
  }
  qgisprocess::qgis_show_help(algs.id[i, "algorithm"])
  cat("\n----------------\n")
  cat("\nValitud algoritm:\n")
  cat(algs.id[i, "algorithm"])
  cat("\n\n----------------\n")
  cat("\n\n")
}