Choose your own adventure Ruby helper

choose-adventure-helper.rb

class Choice
  attr_reader :text
  attr_reader :decision_a
  attr_reader :decision_b

  def initialize(text, decision_a, decision_b)
    @text = text
    @decision_a = decision_a
    @decision_b = decision_b
  end

  def prompt
    puts @text + " (#{selections.join('|')}) "
    response = gets.chomp.downcase
    if response == decision_a.selection
      decision_a.outcome.prompt
    elsif response == decision_b.selection
      decision_b.outcome.prompt
    else
      puts "Response must be #{selections.join(' or ')}"
      prompt
    end
  end

  def selections
    [decision_a.selection, decision_b.selection]
  end
end

class Decision
  attr_reader :selection
  attr_reader :outcome

  def initialize(selection, outcome)
    @selection = selection
    @outcome = outcome
  end
end

class Ending
  def initialize(text)
    @text = text
  end

  def prompt
    puts @text
    exit
  end
end

class Death < Ending
end

class Victory < Ending
end

Choice.new('Which direction?',
  Decision.new('left', Death.new("You died!")),
  Decision.new('right',
    Choice.new('Which weapon?',
      Decision.new('axe',
        Choice.new('Up or down?',
          Decision.new('up', Death.new('You died. Yay!')),
          Decision.new('down', Death.new('You died no matter what! HAHAHA!'))
      )),
      Decision.new('chainsaw', Victory.new('You won by murdering people with a chainsaw!'))
    )
  )
).prompt