defmodule Warlock.ModuleUtils do
  @doc """
  Helpers for working with Module.
  """
  alias Warlock.ModuleUtils

  def name(module), do: module |> Module.split() |> List.first()

  def atom_name(module) do
    module |> ModuleUtils.name() |> String.downcase() |> String.to_atom()
  end

  @doc """
  Gets a module name from an option or from the module when no option is given.
  """
  def name_or_option(module, opt), do: opt || ModuleUtils.atom_name(module)

  @doc """
  Replaces a fragment of a module name, e.g App.Controllers.My -> App.Schemas.My

  The default index is 1.
  """
  def replace_at(module, replacement, index \\ 1) do
    module
    |> Module.split()
    |> List.replace_at(index, replacement)
    |> Module.concat()
  end

  @doc """
  Replaces and slices a module name, e.g App.Controllers.My -> App.Repo
  """
  def slice_replace(module, replacement, index \\ 1) do
    module
    |> Module.split()
    |> List.replace_at(index, replacement)
    |> Enum.slice(0, 2)
    |> Module.concat()
  end
end