https://adventar.org/calendars/10360 の13日目です。 https://it-college.slack.com/archives/C07MPKKSQ3C/p1733972206637199 をRubyで書いてみました。Rubyはいいぞ。

chohan.rb

CHO = "丁"
HAN = "半"

class SixSidedDice
  attr_reader :number

  def roll
    @number = rand(1..6)
  end
end

class Result
  attr_reader :cho_or_han, :total

  def initialize(dice)
    @numbers = dice.map(&:number)
    @total = @numbers.sum
    @cho_or_han = @total.even? ? CHO : HAN
  end

  def show
    @numbers.each.with_index(1) do |num, n|
      puts "さいころ#{n}の目:#{num}"
    end
    puts "さいころの目の合計:#{@total}"
    puts "結果:#{@cho_or_han}"
  end
end

Cup = Data.define(:dice) do
  def shake = dice.each(&:roll)
  def open = Result.new(dice)
end

Player = Data.define(:name) do
  def make_bet
    case gets.to_i
    in 1
      HAN
    in 2
      CHO
    end
  rescue NoMatchingPatternError
    retry
  end
end

class Mat
  def initialize = cleanup

  def balanced? = !too_much_cho? && !too_much_han?
  def place_on(bet, player) = @mat[bet] << player
  def players_on(bet) = @mat[bet]
  def too_much_cho? = cho - han > 1
  def too_much_han? = han - cho > 1

  def cleanup
    @mat = { CHO => [], HAN => [] }
  end

  private

  def cho = @mat[CHO].size
  def han = @mat[HAN].size
end

class Game
  def initialize(players)
    raise ArgumentError if players.size < 2

    @players = players
    @cup = Cup.new([SixSidedDice.new, SixSidedDice.new])
    @mat = Mat.new
    @score_by_player = players.to_h {|player| [player, 0] }
  end

  # よくないですか???
  def play
    shake_cup
    begin
      cleanup_mat
      make_bet
    end until balanced?
    open_cup
    show_result
    update_score
    show_score
  end

  private

  def balanced?
    if @mat.too_much_cho?
      puts "半方ないか?"
    elsif @mat.too_much_han?
      puts "丁方ないか?"
    end
    @mat.balanced?
  end

  def cleanup_mat
    @mat.cleanup
  end

  def make_bet
    @players.each do |player|
      print "#{player.name}さん、半か丁か？(press key 1 or 2) "
      bet = player.make_bet
      puts "#{player.name}さんの予想: #{bet}"
      @mat.place_on(bet, player)
    end
  end

  def open_cup
    @result = @cup.open
  end

  def shake_cup
    @cup.shake
    puts "さいころを振りました"
  end

  def show_result
    @result.show
  end

  def show_score
    @score_by_player.each do |player, score|
      puts "#{player.name}さんのスコア:#{score}"
    end
  end

  def update_score
    @mat.players_on(@result.cho_or_han).each do |player|
      @score_by_player[player] += @result.total
    end
  end
end

def get_player_names(num)
  1.upto(num).map do |n|
    print "プレイヤー#{n}の名前を入力してください: "
    gets.chomp
  end
end

def print_separator
  puts "-" * 32
  puts
end

PLAYER_NUM = 2
names = get_player_names(PLAYER_NUM)
print_separator
players = names.map {|name| Player.new(name:) }
game = Game.new(players)
loop do
  game.play
  print_separator
end