defmodule Scaffolder do
  @moduledoc """
  Scaffolder allows you to easily scaffold folder structure using an elixir map. It also allows
  you to generate a file. By default all folders or files generated by Scaffolder will be created
  under lib folder. Behind the scene, Scaffolder implement DFS to scaffold the folders and files.
  """

  require Logger

  @doc """
  scaffolds folders and files using an elixir map
  """
  def scaffold(structure, dir \\ "./lib") do
    structure
    |> Map.keys()
    |> Enum.each(fn key ->
        cond do
          is_map(structure[key]) == true ->
            Logger.info("Scaffolding " <> dir <> "/#{Atom.to_string(key)}")
            File.mkdir(dir <> "/#{Atom.to_string(key)}")
            scaffold(structure[key], dir <> "/#{Atom.to_string(key)}")

          is_tuple(structure[key]) == true ->
            {file_ext, file_content} = structure[key]
            case File.regular?(dir <> "/#{Atom.to_string(key)}.#{file_ext}") do
              true ->
                Logger.info(dir <> "/#{Atom.to_string(key)}.#{file_ext}" <> " already exist")
              false ->
                Logger.info("Scaffolding " <> dir <> "/#{Atom.to_string(key)}.#{file_ext}")
                File.write(dir <> "/#{Atom.to_string(key)}.#{file_ext}", file_content)
            end

          true ->
            case File.regular?(dir <> "/#{Atom.to_string(key)}.#{structure[key]}") do
              true ->
                Logger.info(dir <> "/#{Atom.to_string(key)}.#{structure[key]}" <> " already exist")
              false ->
                Logger.info("Scaffolding " <> dir <> "/#{Atom.to_string(key)}.#{structure[key]}")
                File.write(dir <> "/#{Atom.to_string(key)}.#{structure[key]}", "")
            end
        end
    end)
  end

end