extractly

defmodule Extractly.DoNotEdit do

  @moduledoc """
  Implements the storage of DO NOT EDIT warning messages for languages and various
  variations.
  """

  @warnings %{
    en: """
    DO NOT EDIT THIS FILE
    It has been generated from %article template %template! by Extractly (https://github.com/RobertDober/extractly.git)
    and any changes you make in this file will most likely be lost
    """,
    fr: """
    NE PAS EDITER CE FICHIER
    Il a été créé à partir %article patron %template! par Extractly (https://github.com/RobertDober/extractly.git)
    et toute modification apportée par vos soins va probablement être perdue
    """
  }

  @articles %{
    en: %{
      true: "the",
      false: "a"
    },
    fr: %{
      true: "du",
      false: "d'un"
    }
  }

  @doc """
  Resolves to the correctly configured and internationalized message
  """
  def warning(opts) do
    lang = Keyword.get(opts, :lang, :en)
    lang =
      if Map.has_key?(@warnings, lang) do
        lang
      else
        IO.puts(:stderr, "Language #{lang} is not supported yet, falling back to :en")
        :en
      end
    template = Keyword.get(opts, :template, false)
    definite = !!template
    article = @articles[lang][definite]
    comment_start = Keyword.get(opts, :comment_start, "<!--\n")
    comment_end = Keyword.get(opts, :comment_end, "-->")
    message(@warnings[lang], {comment_start, comment_end}, template, article)
  end


  defp inner_message(base, template, article)
  defp inner_message(base, false, article) do
    base
    |> String.replace("%article", article)
    |> String.replace("%template! ", "")
  end
  defp inner_message(base, template, article) do
    base
    |> String.replace("%article", article)
    |> String.replace("%template!", "`#{template}`")
  end

  defp message(base, {comment_start, comment_end}, template, article) do
    comment_start <> inner_message(base, template, article) <> comment_end
  end

end