Rock Paper Scissor Game for CareerFoundry

rps.rb

require 'pry'
class RockPaperScissorGame
  attr_accessor :player_choice, :computer_choice

  CHOICES = {
    :p => 'Paper',
    :r => 'Rock',
    :s => 'Scissor'
  }.freeze

  WINNERS = {
    [:p, :r] => :p,
    [:p, :s] => :s,
    [:r, :s] => :r
  }.freeze

  def initialize
    @player_choice = get_player_choice
    play
    evaluate_again
  end

  def evaluate_again
    puts "Play again? (y/n)"
    choice = gets.chomp.downcase
    if choice == 'y'
      self.class.new
    else
      puts "Goodbye!"
    end
  end

  def get_player_choice
    puts "What is your selection?"
    puts 'For Rock enter "R"'
    puts 'For Paper enter "P"'
    puts 'For Scissor enter "S"'

    player_choice = gets.chomp.downcase.to_sym
    if CHOICES.keys.include?(player_choice)
      player_choice
    else
      puts "That's not a valid selection"
      self.class.new
    end
  end

  def choice_to_s(choice)
    CHOICES[choice]
  end
  
  def computer_choice
    @computer_choice ||= CHOICES.keys.sample
  end

  def play
    puts "You chose #{CHOICES[player_choice]}, the computer chose #{CHOICES[computer_choice]}"
    evaluate_outcome(player_choice, computer_choice)
  end

  def evaluate_outcome(player_choice, computer_choice)
    if player_choice == computer_choice
      puts "You and the computer both selected #{CHOICES[player_choice]}"
    else
      winning_symbol = determine_winner(player_choice, computer_choice)
      report_winner(winning_symbol)
    end
  end

  def report_winner(symbol)
    case symbol
    when player_choice
      puts "The winner is you!"
    when computer_choice
      puts 'The computer won!'
    else
      puts 'I have no idea what just happened'
    end
  end

  def determine_winner(s1, s2)
    object_1 = eval(CHOICES[s1]).new
    object_2 = eval(CHOICES[s2]).new
    
    winner = object_1.beaten_by(object_2) ? s2 : s1

    winner
  end
end

class Rock < RockPaperScissorGame
  def initialize()
  end

  def beaten_by(comparison_object)
    if comparison_object.is_a?(Paper)
      true
    else
      false
    end
  end
end

class Paper < RockPaperScissorGame
  def initialize()
  end

  def beaten_by(comparison_object)
    if comparison_object.is_a?(Scissor)
      true
    else
      false
    end
  end
end

class Scissor < RockPaperScissorGame
  def initialize()
  end

  def beaten_by(comparison_object)
    if comparison_object.is_a?(Rock)
      true
    else
      false
    end
  end
end

RockPaperScissorGame.new