Rock, paper, scissors game built with Ruby

colorized_strings.rb

class String
  def red
    "\e[31m#{self}\e[0m"
  end

  def green
    "\e[32m#{self}\e[0m"
  end

  def yellow
    "\e[33m#{self}\e[0m"
  end

  def blue
    "\e[34m#{self}\e[0m"
  end

  def cyan
    "\e[36m#{self}\e[0m"
  end
end

game.rb

require './messages.rb'

# Main Game class for Rock, Paper, Scissors
class Game
  include Messages
  attr_accessor :win_count, :lose_count, :tie_count, :games_played

  def initialize
    @win_count = 0
    @lose_count = 0
    @tie_count = 0
    @games_played = 0
  end

  def play_match
    start_message
    player_counter = gets.chomp.downcase
    validate_input(player_counter)
    game_counter = computer_choice
    show_choices(player_counter, game_counter)
    calculate_winner(player_counter, game_counter)
    @games_played += 1
    prompt_rematch
  end

  private

  def validate_input(input)
    unless %w[rock paper scissors].include?(input)
      error_message(player_input)
      abort_and_rematch
    end
  end

  def calculate_winner(player, computer)
    case [player, computer]
    when %w[rock scissors], %w[paper rock], %w[scissors paper]
      win_message
      @win_count += 1
    when %w[rock paper], %w[paper scissors], %w[scissors rock]
      lose_message
      @lose_count += 1
    else
      tie_message
      @tie_count += 1
    end
  end

  def abort_and_rematch
    @lose_count += 1
    prompt_rematch
  end

  def computer_choice
    counter = rand(1..9)
    return 'rock' if counter <= 3
    return 'paper' if counter > 3 && counter < 7

    'scissors'
  end

  def prompt_rematch
    rematch_message
    answer = gets.chomp
    affirmative?(answer) ? play_match : end_game
  end

  def end_game
    farewell_message
    game_finished_message(total: games_played, win: win_count, lose: lose_count, tie: tie_count)
  end
  
  def affirmative?(answer)
    answer.casecmp('yes').zero? || answer.casecmp('y').zero?
  end
end

messages.rb

require './colorized_strings.rb'

module Messages
  def self.welcome_message
    puts ' *********************************************************'
    puts ' *********************************************************'
    puts ' *********** Welcome to Rock, Paper, Scissors! ***********'
    puts ' ** Rock beats scisssors, Scissors beat paper ************'
    puts ' ** Paper beats rock. Any other answer counts as a loss **'
    puts ' *********************************************************'
    puts ' *********************************************************'
    puts ''
  end

  def farewell_message
    puts 'See you later human'
  end

  def start_message
    puts "Ok, let's begin!\n"
    puts 'Rock, paper or scissors?'
  end

  def win_message
    puts '***You win!***'.cyan
  end

  def lose_message
    puts '---You lose---'.red
  end

  def tie_message
    puts 'You tied'.yellow
  end

  def error_message(player_input)
    puts "I don't know what to do with #{player_input.red}."
    puts "Is this some sort of human trick? #{lose_message}"
    puts "No more #{player_input}s please."
  end

  def rematch_message
    puts "Do you want to play again? Type 'yes' or 'y' to continue. Or anything else to quit."
  end

  def show_choices(player, computer)
    puts "Computer chose #{computer}!"
    puts "You chose #{player}!"
  end

  def game_finished_message(total:, win:, lose:, tie:)
    puts "You played #{total.to_s.blue} rounds."
    puts "You won #{win.to_s.cyan}, lost #{lose.to_s.red}, and tied #{tie.to_s.yellow}."
  end
end

rock_paper_scissor.rb

#!/usr/bin/env ruby

require './game.rb'
require './messages.rb'

Messages.welcome_message
Game.new.play_match