#' Export GPKG to PostgreSQL
#'
#' Exports a gpkg file layer into a PostgreSQL database.
#'
#' gtype: Output geometry type 'enum':. Acceptable values: Number of selected option, e.g. '1' or Comma separated list of options, e.g. c(1,3). See more: \url{https://gdal.org/drivers/vector/pg.html}.
#'   - 0:
#'   - 1: NONE
#'   - 2: GEOMETRY
#'   - 3: POINT
#'   - 4: LINESTRING
#'   - 5: POLYGON
#'   - 6: GEOMETRYCOLLECTION
#'   - 7: MULTIPOINT
#'   - 8: MULTIPOLYGON
#'   - 9: MULTILINESTRING
#'
#' @param gpkg Gpkg file path.
#' @param layer A gpkg file layer [sf::st_layers()].
#' @param conf A list() of configuration variables. Default values \code{\link[ruut]{get_config}}.
#' @return No output.
#' @seealso [ruut::get_config()], [ruut::copy_shp_to_db()], [ruut::copy_qgis_object_to_db()]
#' @keywords postgis, gpkg
#' @export
#' @examples
#' \dontrun{
#'
#' conf <- ruut::get_config()
#' gpkg_file <- "/home/ardo/aaa/data/gpkg/grids/estonian_grids.gpkg"
#' # Vaata layer'eid
#' sf::st_layers(gpkg_file)
#' # Vali layer
#' layer <- "epk200t_grid"
#' conf$table <- "aaa_1"
#' conf$schema <- "data"
#' copy_gpkg_to_db(gpkg = gpkg_file, layer = layer, conf = conf)
#' copy_gpkg_to_db(gpkg = gpkg_file, conf = conf) # viga
#' }
copy_gpkg_to_db <- function(gpkg = NULL, layer = NULL, conf = NULL) {
  if (is.null(gpkg)) {
    return(cat("\ngpkg fail puudu.\n"))
  }
  if (is.null(layer)) {
    return(cat("\ngpkg layer puudu.\n"))
  }
  if (is.null(conf)) conf <- ruut::get_config()
  layer <- sprintf("|layername=%s", layer)
  input <- sprintf("%s%s", gpkg, layer)
  # obj - objekti nimetus (näiteks: valga)
  # ruut::qgis_algorithm_search_by_word(str = "importinto")
  algorithm <- "qgis:importintopostgis"
  # cat(qgisprocess::qgis_show_help(algorithm = algorithm))
  # qgisprocess::qgis_outputs(algorithm = algorithm)
  ruut::db_create_new_schema(conf)
  result <- qgisprocess::qgis_run_algorithm(
    algorithm = algorithm,
    CREATEINDEX = 1,
    DATABASE = tools::toTitleCase(tolower(conf$dbname)), # millegipärast peab algama suure tähega
    DROP_STRING_LENGTH = 0,
    ENCODING = conf$encoding,
    FORCE_SINGLEPART = 0,
    GEOMETRY_COLUMN = conf$geometry_column,
    INPUT = input,
    LOWERCASE_NAMES = 1,
    OVERWRITE = 1,
    PRIMARY_KEY = conf$primary_key,
    SCHEMA = conf$schema,
    TABLENAME = conf$table,
  )
  # result
}