defmodule Localizator.Translitor do
  @typedoc """
  Locale
  """
  @type locale :: String.t()
  @type to :: locale

  @typedoc """
  Translitor service
  """
  @type translitor :: Atom.t()

  @typedoc """
  Transliters list
  """
  @type translitors :: [translitor]

  @typedoc """
  Translition resource
  """
  @type resource :: String.t() | Map.t() | List.t()
  @type source :: resource
  @type result :: resource

  @typedoc """
  Error Message
  """
  @type message :: String.t()

  @spec list() :: translitors
  def list(), do: Application.get_env(:localizator, :translitors)

  defp translitors() do
    list()
    |> Enum.map(fn translitor -> {translitor.locale(), translitor} end)
    |> Map.new()
  end

  @spec convert(source, locale) :: {:ok, result} | {:error, message}
  def convert(source, locale) do
    translitor =
      translitors()
      |> Map.get("#{locale}")

    translitor.convert(source)
  end
end