defmodule Argx.Util do
  @moduledoc false

  def list_to_map(nil) do
    %{}
  end

  def list_to_map(list) do
    list
    |> Enum.reduce(%{}, fn item, acc ->
      acc |> Map.merge(item)
    end)
  end

  ###
  def make_fun_name(prefix, name) do
    name
    |> fun_name_rule(prefix)
    |> IO.iodata_to_binary()
    |> String.downcase()
    |> String.to_atom()
  end

  defp fun_name_rule(name, prefix) when is_bitstring(name) do
    [prefix, "_", name, "__", "macro"]
  end

  defp fun_name_rule(name, prefix) when is_atom(name) do
    name |> to_string() |> fun_name_rule(prefix)
  end

  defp fun_name_rule(_, _) do
    []
  end

  ###
  def make_module_name([_ | _] = parts) do
    [Elixir | parts]
    |> Enum.map(fn part ->
      to_string(part)
    end)
    |> Enum.join(".")
    |> String.to_atom()
  end

  ###
  def sort_by_keys(keys, %{} = data) do
    keys
    |> Enum.reduce([], fn key, acc ->
      value = Map.get(data, key)
      [{key, value} | acc]
    end)
    |> Enum.reverse()
  end
end