#' Piirkonnale andmebaasis oleva liiklussageduse andmete jagamine kihtideks
#'
#' Etteantud piirkonna geomeetrilise piirjoone ('piir') ja selle joone piirikasti ('bb') järele leitud liiklussagedusandmete eraldamine kihtideks ("sapa", "vaab", "ar", "sapaarv", "vaabarv", "ararv"). Andmed salvestatakse postgis andmebaasi.
#'
#' @param obj str Objekti nimi. Edaspidi on oluline ainult see nimi. Piirkonna geomeetrilist joont ei ole vaja lisada.
#' @param conf A list() of configuration variables. Default values \code{\link[ruut]{get_config}}.
#' @return Liiklussageduse andmete jagamine kihtideks.
#' @seealso [sf::st_read()], [sf::write_sf()],[sf::st_transform()],[ruut::pk_sellest_alustame_db_loomist()],[ruut::pk_lisame_ruudustikud()] ,[ruut::pk_lisame_polygoonid()],[ruut::pk_lisame_jooned()],[ruut::pk_lisame_punktid()],[ruut::pk_teisendame_polygoone()],[ruut::pk_teisendame_jooni()],[ruut::pk_teisendame_punkte()]
#' @keywords postgis, boundary box, EPSG:3301
#' @export
#' @examples
#' \dontrun{
#'
#' obj <- "marja"
#' pk_teisendame_liiklussagedusi(obj = obj, conf = NULL)
#'
#' # Layers list.
#' ruut::db_schema_tablenames(conf = conf)
#' }
pk_teisendame_liiklussagedusi <- function(obj = NULL, conf = NULL) {
  ## ------------- muutujad ja teisendused ---------------
  vars <- ajutised_muutujad(pk = NULL, obj, conf)
  obj <- vars$obj
  piir <- vars$pk
  conf <- vars$conf
  ## Konfiguratsiooni muutujale väärtuste omistamine, kui seda pole antud.
  if (!any("a00_piir" %in% ruut::db_schema_tablenames(conf = conf))) {
    cat(
      "\nAndmebaas loomata. Palun funktsiooniga ruut::pk_sellest_alustame_db_loomist() andmebaasi loomist.\n"
    )
    return(NULL)
  }

  ## ====================== teisendused =====================
  # Layers list
  layer_names <- ruut::db_schema_tablenames(conf = conf)
  layer_names <-
    layer_names[!layer_names %in% c(
      "a00_piir",
      "a00_bb2",
      "a00_piir_bb",
      "bb2_epk10t_grid",
      "bb2_epk02t_grid",
      "bb2_epk2t_grid"
    )]
  layer_names <- layer_names[grepl("^data_l_", layer_names)]
  layer_name <- "n_liiklussagedus"
  parent_table <- "data_l_te_n_liiklussagedus"

  ## Konfiguratsiooni muutujale väärtuste omistamine, kui seda pole antud.
  if (!parent_table %in% layer_names) {
    cat(sprintf("\nPuudub andmebaas \"%s\".\n", parent_table))
    return(NULL)
  }

  conn <- ruut::db_connect(conf = conf)
  try(ruumiline_obj <-
        sf::st_read(dsn = conn,
                    layer = c(conf$schema, parent_table)))
  DBI::dbDisconnect(conn)
  ## Kontlrollime kas geomeetriline objekt on polügoon.
  ## Arvutame sel juhul pindala.
  is_line <-
    any(grepl("line", tolower(attributes(
      ruumiline_obj$geom
    )$class), fixed = TRUE))
  # Liiklussageduse klassid.
  ls_klassid <-
    c("sapa", "vaab", "ar", "sapaarv", "vaabarv", "ararv")
  if (is_line) {
    for (ls_klass in ls_klassid) {
      ls <- ruumiline_obj[, ls_klass]
      ## Veeru ümbernimetamine
      names(ls) <- c("ls", "geom")

      ## 1. Ajutise sf salvestamine
      pk <- sf::st_transform(ls, 3301)
      # Write to gpkg and check validity
      sf::write_sf(
        pk,
        dsn = vars$tmp_gpkg_file,
        layer = vars$conf$gpkg_table,
        driver = "gpkg",
        fid_column_name = "fid",
        delete_dsn = T
      )
      ## 2. Lõikame objekti ruudistikga tükkideks. Ühte ruutu võib jääda mitu tükki.
      ## Peame need pärast ühendama
      # ruut::qgis_algorithm_search_by_word("join")
      algorithm <- "native:joinattributesbylocation"
      conf$table <- sprintf("%s", "bb2_epk02t_grid")
      input <- ruut::construct_to_gpkg_output_postgres_str(
        conf = conf,
        geometry_type = "Polygon",
        srid = 3301,
        checkPrimaryKeyUnicity = TRUE,
        key = "id",
        geometry_field = "geom"
      )
      join <- vars$tmp_gpkg_file_input_1
      output <- vars$tmp_gpkg_file_output_2 # ajutine fail
      str <-
        sprintf(
          "{
    'DISCARD_NONMATCHING' : false,
    'INPUT' : '%s',
    'JOIN' : '%s',
    'JOIN_FIELDS' : ['ls'],
    'METHOD' : 2,
    'OUTPUT' : '%s',
    'PREDICATE' : [0],
    'PREFIX' : ''
}",
          input,
          join,
          output
        )
      cmd <-
        ruut::construct_qgis_output_result_to_better_format(str = str, algorithm = algorithm)
      system(cmd)

      ## ------------- TIFF ----------------
      ## 5. Asendame NULL väärtustega 0.
      algorithm <- "qgis:advancedpythonfieldcalculator"
      input <- vars$tmp_gpkg_file_input_2 # ajutine fail
      output <- vars$tmp_gpkg_file_output_1
      cmd <-
        sprintf(
          "qgis_process run %s --FIELD_NAME='value' --FIELD_TYPE=1 --FIELD_LENGTH=4 --FIELD_PRECISION=2 --GLOBAL=\"def getValue(x):
    if not x:
        value = 0
    else:
        value = round(x,1)
    return value\" --FORMULA='value = getValue( <ls> )' --INPUT='%s' --OUTPUT='%s' ",
          algorithm,
          input,
          output
        )
      system(cmd)

      ## 6. tif salvestamine tmp kataloogi
      conn <- ruut::db_connect(conf = conf)
      grid_layer <-
        sf::read_sf(dsn = conn,
                    layer = c(conf$schema, "bb2_epk02t_grid"))
      DBI::dbDisconnect(conn)
      # sf::st_crs(grid_layer) <- 3301
      pk_attributes <- attributes(grid_layer$geom)
      extent <-
        sprintf(
          "%s,%s,%s,%s [EPSG:3301]",
          round((pk_attributes$bbox["xmin"] / 100), digits = 0) * 100,
          ceiling((pk_attributes$bbox["xmax"] / 100)) * 100,
          round((pk_attributes$bbox["ymin"] / 100), digits = 0) * 100,
          ceiling((pk_attributes$bbox["ymax"] / 100)) * 100
        )
      # ruut::qgis_algorithm_search_by_word("Rasterize")
      algorithm <- "gdal:rasterize"
      # ruut::qgis_show_help(algorithm = algorithm)
      input <- vars$tmp_gpkg_file_input_1
      tif_file_name <-
        sprintf("tif_%s_%s", gsub("^data_", "", parent_table), ls_klass)
      output <- sprintf("%s/%s.tif", vars$tmp_dir, tif_file_name)
      str <-
        sprintf(
          "{ 'BURN' : 0, 'DATA_TYPE' : 5, 'EXTENT' : '%s', 'EXTRA' : '-a_srs epsg:3301', 'FIELD' : 'value', 'HEIGHT' : 100, 'INIT' : None, 'INPUT' : '%s', 'INVERT' : False, 'NODATA' : -1, 'OPTIONS' : '', 'OUTPUT' : '%s', 'UNITS' : 1, 'WIDTH' : 100 }",
          extent,
          input,
          output
        )
      cmd <-
        ruut::construct_qgis_output_result_to_better_format(str = str, algorithm = algorithm)
      system(cmd) # Salvestame kataloogi

      ## 7. ----------- TIF TO POSTGIS -------------
      (
        cmd <- sprintf(
          "export PGPASSWORD=%s && raster2pgsql -s 3301 -d -I -C -M %s %s.%s_tif | psql -U %s -d %s -h %s -p %s",
          conf$password,
          output,
          conf$schema,
          tif_file_name,
          conf$user,
          conf$dbname,
          conf$host,
          conf$port
        )
      )
      system(cmd)

      ## 8. Eemaldame üleliigsed veerud ja salvestame tiff alusfaili andmebaasi
      # ruut::qgis_algorithm_search_by_word("Drop ")
      algorithm <- "native:deletecolumn"
      input <- vars$tmp_gpkg_file_input_1
      conf$table <-
        sprintf("grid_%s_%s", gsub("^data_", "", parent_table), ls_klass)
      output <-
        ruut::construct_to_gpkg_output_postgres_str(
          conf = conf,
          geometry_field = "geom",
          geometry_type = "Polygon",
          srid = 3301,
          checkPrimaryKeyUnicity = FALSE,
          key = "id"
        )
      cmd <-
        sprintf(
          "qgis_process run %s --COLUMN='fid' --COLUMN='left' --COLUMN='top' --COLUMN='right' --COLUMN='bottom' --COLUMN='ls' --INPUT='%s' --OUTPUT='%s' ",
          algorithm,
          input,
          output
        )
      system(cmd)

      ## 9. Kustutame geom veeru.
      conn <- ruut::db_connect(conf = conf)
      q <-
        sprintf("ALTER TABLE \"%s\".\"%s\" DROP COLUMN geom;",
                conf$schema,
                conf$table)
      cat(sprintf("\n-----------------\n%s\n\n", q))
      DBI::dbSendQuery(conn, q)
      ## 10. Vaakum.
      q <-
        sprintf(
          "VACUUM (FULL, FREEZE, VERBOSE, ANALYZE, INDEX_CLEANUP) \"%s\".\"%s\";",
          conf$schema,
          conf$table
        )
      cat(sprintf("\n-----------------\n%s\n\n", q))
      DBI::dbSendQuery(conn, q)
      ## 11. Add foreign key.
      q <-
        sprintf(
          "ALTER TABLE \"%s\".\"%s\" ADD CONSTRAINT %s_fk FOREIGN KEY (id) REFERENCES %s.bb2_epk02t_grid(id);",
          conf$schema,
          conf$table,
          conf$table,
          conf$schema
        )
      cat(sprintf("\n-----------------\n%s\n\n", q))
      DBI::dbSendQuery(conn, q)
      DBI::dbDisconnect(conn)
    }
  }
  ## Layers list
  conf$schema <- obj
  ruut::db_schema_tablenames(conf = conf)
  sf::st_layers(dsn = vars$tmp_gpkg_file)
}