puts "VERSION = #{VERSION}"


class RPS
  
  Hierarchy = {
    :rock      =>  { :rock => :tie  , :paper => :lose , :scissors => :win  } ,
    :paper     =>  { :rock => :win  , :paper => :tie  , :scissors => :lose } ,
    :scissors  =>  { :rock => :lose , :paper => :win  , :scissors => :tie  } ,
  }
  
  Choices = Hierarchy.keys
  
  attr_reader :guess
  def initialize( guess )
    guess = guess.to_sym
    raise "invalid guess" unless Choices.include?(guess)
    @guess = guess
  end
  
  def fight     ( opponent )   Hierarchy[guess][opponent.guess]   end
  def beats?    ( opponent )   fight(opponent) == :win            end
  def beat_by?  ( opponent )   fight(opponent) == :lose           end
  def ties?     ( opponent )   fight(opponent) == :tie            end
  def to_s      (          )   guess.to_s                         end
  
end



RPS::Choices.each do |userinput1|  RPS::Choices.each do |userinput2|
  
  player1,player2 = RPS.new(userinput1),RPS.new(userinput2)
  
  outcome = player1.fight(player2)
  
  puts "player1 chooses #{player1.guess} and #{outcome}s " \
       "the fight with player2 who chooses #{player2.guess}"
       
end end