defmodule L42fu do
  alias L42fu.{Commands, Error, Tools}
  alias Commands.{Echo, Move}

  @doc ~S"""
  main entry into functional part, the calling script passes the list of arguments which come
  from the commandline and can have stdin lines appended

  We dispatch on subcommands
  """
  def main(args),
    do: args |> Tools.partition_args() |> _dispatch!() |> List.flatten() |> Enum.join("\n")

  defp _dispatch!(args) do
    case _dispatch(args) do
      {:ok, output} -> output
      {:error, message} -> raise Error, message
    end
  end

  defp _dispatch(args)
  defp _dispatch({"echo", options, args}), do: Echo.echo(args, options)
  defp _dispatch({"mv", options, args}), do: Move.move(args, options)
  defp _dispatch({"move", options, args}), do: Move.move(args, options)
end

# SPDX-License-Identifier: Apache-2.0