defmodule Grimoire do
    defp build_content(mod_name) do
        """
        defmodule #{mod_name} do
            def schema() do
                %{}
            end
        end
        """
    end

    def new(dir, file_name, mod_name) do
        Grimoire.Utilities.Files.latest_file(dir)
        |> case do
            [] ->
                path = Path.join(dir, file_name)
                File.write!(path, build_content(mod_name))
            f ->
                path = Path.join(dir, file_name)
                old_content = File.read!(f.full_path)
                # Clip off the first line, we're rewriting it
                [_hd | tl] = String.split(old_content, "\n")
                header = "defmodule #{mod_name} do"
                new_content = Enum.join([header | tl], "\n")
                File.write!(path, new_content)
        end
    end

end