defmodule JacobCli.Commands.Shell.Autocomplete do
  use Jacob.Command

  @name "_autocomplete"
  @desc "list commands for zsh autocompletion"
  @hidden true
  @moduledoc false

  def run(["_autocomplete", "zsh"]), do: list_commands(:zsh)
  def run(["_autocomplete", "bash"]), do: list_commands(:bash)

  defp list_commands(:zsh) do
    get_all_commands()
    |> zsh_autocompletion()
  end

  defp list_commands(:bash) do
    get_all_commands()
    |> bash_autocompletion()
  end

  defp bash_autocompletion([]), do: nil

  defp bash_autocompletion([{_, command} | next_commands]) do
    IO.write(~s'"#{command.name}" ')
    bash_autocompletion(next_commands)
  end

  defp zsh_autocompletion([]), do: nil

  defp zsh_autocompletion([{_, command} | next_commands]) do
    IO.puts(sanitize(command.name) <> ":" <> sanitize(command.desc))
    zsh_autocompletion(next_commands)
  end

  defp get_all_commands() do
    Jacob.Command.Server.all()
    |> Enum.filter(fn {_, command} -> !command.hidden? end)
  end

  defp sanitize(value) do
    value |> String.replace(":", "\\:")
  end
end