tmap

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

defmodule KeysCasePlugin do
  use Plugin
  require Logger
  def transform(dict, options) do
    if  not MapUtils.all_required_keys?(options, ["case", "mode"]) do
      dict
    else
      keys = Map.keys(dict)
      List.foldl(keys, dict,
        fn old_key, acc ->
          new_key = if options["case"] == "lower", do: String.downcase(old_key), else: String.upcase(old_key)
          if old_key != new_key do
            value = acc[old_key]
            acc
              |> KeysAddPlugin.transform( %{"keys" => %{new_key => value}, "mode" => options["mode"]})
              |> KeysDeletePlugin.transform(%{"keys" => [old_key]})
          else
            acc
          end
        end)
    end
  end
end