defmodule EctoGettext do
  @moduledoc """
  EctoGettext - library for localization Ecto validation errors with using Gettext

  ### Install:

  1. Install Gettext and EctoGettext

  2. Import EctoGettext module:

    ```
    import EctoGettext
    ```

  3. Use it
  """

  @doc """
  Get a list of ecto validation errors and return a new list with translated errors

  ### Using:
    ```
    localize_validations(MyApp.Gettext, f.errors)
    ```
  """
  @spec localize_validations(module, list) :: list
  def localize_validations(module, errors) do
    errors
    |> Enum.map(fn elem -> localize(module, elem) end)
  end

  @spec localize(module, tuple) :: {String.t, String.t}
  defp localize(module, error) do
    {attr, message} = error

    {EctoGettext.Attribute.localize_attribute(module, attr),
      EctoGettext.Message.localize_message(module, message)}
  end

  @doc """
  Get an attribute name as atom and return a string with translated attribute

  ### Using:
    ```
    localize_attribute(MyApp.Gettext, :username)
    ```
  """
  @spec localize_attribute(module, atom) :: String.t
  def localize_attribute(module, attr) do
    EctoGettext.Attribute.localize_attribute(module, attr)
  end

  @doc """
  Get a validation message and return new translated message

  ### Using:
    ```
    localize_message(MyApp.Gettext, "can't be blank")
    ```
  """
  @spec localize_message(module, String.t) :: String.t
  def localize_message(module, message) do
    EctoGettext.Message.localize_message(module, message)
  end
end