defmodule Argos.CLI.Parser do
  @moduledoc """
  Módulo para parsear argumentos de línea de comandos.
  """

  @doc """
  Parsea los argumentos de línea de comandos.

  Detects if help is requested for a specific command by checking if `--help` or `-h`
  appears after a command in the remaining arguments.
  """
  @spec parse_args([String.t()]) :: {[String.t()], [String.t()], keyword(), String.t() | nil}
  def parse_args(argv) do
    {opts, remaining, _errors} =
      OptionParser.parse(argv,
        strict: [
          command: :keep,
          help: :boolean,
          examples: :boolean,
          version: :boolean,
          no_config: :boolean,
          load_config: :boolean,
          no_login: :boolean,
          asdf_local: :boolean
        ],
        aliases: [
          c: :command,
          h: :help,
          e: :examples,
          v: :version
        ]
      )

    commands = collect_commands(opts)
    command_for_help = detect_command_for_help(remaining, opts)
    {commands, remaining, opts, command_for_help}
  end

  defp detect_command_for_help(remaining, opts) do
    help_requested = Keyword.get(opts, :help, false)

    if help_requested and length(remaining) > 0 do
      command = List.first(remaining)

      if command in ["--help", "-h", "help"] do
        nil
      else
        command
      end
    else
      nil
    end
  end

  @doc """
  Recoge todos los comandos de las opciones (puede haber múltiples --command).
  """
  @spec collect_commands(keyword()) :: [String.t()]
  def collect_commands(opts) do
    opts
    |> Keyword.get_values(:command)
    |> Enum.filter(&(&1 != nil and &1 != ""))
  end
end