defmodule ExRPG.CLI do
  alias ExRPG.Dice
  @moduledoc """
  The CLI for the project
  """

  def main(argv) do
    optimus = Optimus.new!(
      name: "ex_rpg",
      description: "CLI for all things RPG",
      version: "0.1.0",
      author: "Quigley Malcolm quigley@quigleymalcolm.com",
      about: "Utility for playing tabletop role-playing games.",
      allow_unknown_args: false,
      parse_double_dash: true,
      subcommands: [
        roll: [
          name: "roll",
          about: "Roll some dice",
          args: [
            dice: [
              value_name: "DICE",
              help: "Dice in the format of xdy wherein x is the number of dice, y is the number of sides the dice should have",
              required: true,
              parser: :string
            ]
          ]
        ]
      ]
    )

    case Optimus.parse!(optimus, argv) do
      %{args: %{}} ->
        Optimus.parse!(optimus, ["--help"])

      {[:roll], parse_result} ->
        handle_roll(parse_result)

      default ->
        IO.inspect(default)
    end
  end

  def handle_roll(%Optimus.ParseResult{args: %{dice: dice_str}}) do
    Dice.roll(dice_str)
    |> IO.inspect(label: "Results")
  end
end