defmodule PhxTailwindGenerators do
  @moduledoc """
  Documentation for `PhxTailwindGenerators`.
  """

  @doc """
  Injects snippet before the final end in a file
  """
  @spec inject_before_final_end(String.t(), String.t()) :: {:ok, String.t()} | :already_injected
  def inject_before_final_end(code, code_to_inject) when is_binary(code) and is_binary(code_to_inject) do
    if String.contains?(code, code_to_inject) do
      :already_injected
    else
      new_code =
        code
        |> String.trim_trailing()
        |> String.trim_trailing("end")
        |> Kernel.<>(code_to_inject)
        |> Kernel.<>("end\n")

      {:ok, new_code}
    end
  end
end