#' 'qgisprocess' funktsiooonides GPKG INPUT/OUTPUT konstrueerimine Postgresql salvestamiseks
#'
#' See funktsioon konstrueerib 'qgisprocess' funktsioonides enamasti INPUT/OUTPUT/OVERLAY parameetri argumentide  kasutatava fraasi, mis on vajalik postgresql andmebaasiga ühendamisegs.
#' @param conf A list() of configuration variables. Default values \code{\link[ruut]{get_config}}.
#' @param geometry_field str A geometri field name. Default: "geom".
#' @param geometry_type str Select: 'Point', 'LineString', 'Polygon', 'MultiPoint', 'MultiLineString', 'MultiPolygon', 'GeometryCollection','PolygonWithHole','Collection'.
#' @param srid CRS Default: 3301. Other: 4326.
#' @param checkPrimaryKeyUnicity TRUE/FALSE.
#' @param key str A primary key ID, usally 'id'.
#' @seealso [ruut::db_connect()], [ruut::get_config()], [ruut::construct_ogr2ogr_PG_connect_str()], [ruut::construct_qgis_output_result_to_beter_format()],[ruut::construct_to_gpkg_output_file_str()]
#' @return A string "postgres://dbname='%s' host=%s port=%s user='%s' password='%s' sslmode=%s key='id' srid=3301  checkPrimaryKeyUnicity='1' table=\"%s\".\"%s\" (geom)".
#' @seealso [ruut::construct_ogr2ogr_PG_connect_str()], [ruut::construct_qgis_output_result_to_beter_format()]
#' @keywords qgis_process
#' @export
#' @examples
#' \dontrun{
#'
#'
#' conf <- ruut::get_config()
#' conf$schema <- "maaamet"
#' conf$table <- "asustusyksus"
#' input <- ruut::construct_to_gpkg_output_postgres_str(
#'   conf = conf, geometry_type = "Polygon", srid = 3301,
#'   checkPrimaryKeyUnicity = TRUE, key = "id"
#' )
#' conf$schema <- "data"
#' conf$table <- "test"
#' output <- ruut::construct_to_gpkg_output_postgres_str(
#'   conf = conf, geometry_type = NULL, srid = NULL,
#'   checkPrimaryKeyUnicity = FALSE, key = NULL
#' )
#'
#' str <- paste0("{ 'DISSOLVE' : False, 'DISTANCE' : 100, 'END_CAP_STYLE' : 2,
#' 'INPUT' : '", input, "', 'JOIN_STYLE' : 1, 'MITER_LIMIT' : 2,
#' 'OUTPUT' : '", output, "', 'SEGMENTS' : 5 }")
#' algorithm <- "native:buffer"
#' cmd <- ruut::construct_qgis_output_result_to_beter_format(str = str, algorithm = algorithm)
#' system(cmd)
#' }
construct_to_gpkg_output_postgres_str <- function(conf = NULL, geometry_field = "geom", geometry_type = NULL, srid = NULL, checkPrimaryKeyUnicity = FALSE, key = NULL) {
  if (is.null(conf)) conf <- ruut::get_config()
  if (is.null(geometry_type)) geometry_type <- "" else geometry_type <- sprintf("type=%s", geometry_type)
  if (is.null(srid)) srid <- "" else srid <- sprintf("srid=%s", srid)
  if (checkPrimaryKeyUnicity) checkPrimaryKeyUnicity <- "checkPrimaryKeyUnicity='1'" else checkPrimaryKeyUnicity <- ""
  if (is.null(key)) key <- "" else key <- sprintf("key='%s'", key)
  PG <- sprintf(
    "postgres://dbname='%s' host=%s port=%s user='%s' password='%s' sslmode=%s %s %s %s %s table=\"%s\".\"%s\" (%s)",
    conf$dbname, conf$host, conf$port, conf$user, conf$password, conf$sslmode, key, srid, geometry_type, checkPrimaryKeyUnicity, conf$schema, conf$table, geometry_field
  )
  PG
}