[TicTacToe] The game

tictactoe.rb

class TicTacToe
  def initialize
    @player1 = Player.new(1, 'X')
    @player2 = Player.new(2, 'O')
    @players = [@player1, @player2]
    @winner  = false
    @board   = Board.new
  end

  def play
    @player1.ask_name
    @player2.ask_name

    0.step do |iteration|
      selected_player = @players[iteration % 2]

      @board.draw

      position = ask_movement(selected_player)

      @board.fill(position, selected_player.sign)

      break if should_finish?
    end

    print_result
  end

  private

  def ask_movement(selected_player)
    position = nil

    loop do
      print "Please, choose your movement #{selected_player.name}"
      intent = gets

      if valid_intent?(intent.to_i)
        position = intent.to_i

        break
      else
        puts "Sorry, the position #{intent.chomp} is not usable. Try again"
      end
    end

    print "\n"

    position
  end

  def valid_intent?(intent)
    [email protected]_spaces[intent] && intent <= @board.size
  end

  def do_we_have_a_winner?
    @winner = if winner?(@player1)
                @player1
              elsif winner?(@player2)
                @player2
              end
  end

  def winner?(player)
    Board::WINNING_COMBINATIONS.map do |combination|
      @board.filled_spaces[combination[0]] == player.sign &&
        @board.filled_spaces[combination[1]] == player.sign &&
        @board.filled_spaces[combination[2]] == player.sign
    end.any?
  end

  def should_finish?
    do_we_have_a_winner? || @board.complete?
  end

  def print_result
    if @winner
      puts "The winner is #{@winner.name}"
      @board.draw
    else
      puts "No winners in this game :("
    end
  end
end

class Board
  attr_reader :filled_spaces

  WINNING_COMBINATIONS = [
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8],
    [0, 3, 6],
    [1, 4, 7],
    [2, 5, 8],
    [0, 4, 8],
    [2, 4, 6]
  ].freeze
 
  def initialize
    @filled_spaces = Array.new(9)
  end

  def draw
    @filled_spaces.size.times do |time|
      print "\n" if (time % 3).zero?

      char = @filled_spaces[time].nil? ? ' ' : @filled_spaces[time]
      print "| #{char} |"
    end
    print "\n"
  end

  def fill(index, sign)
    @filled_spaces[index] = sign
  end

  def complete?
    @filled_spaces.all?
  end

  def size
    @size ||= 9
  end
end

class Player
  attr_reader :name, :sign

  def initialize(number, sign)
    @number = number
    @sign   = sign
  end

  def ask_name
    puts "Hi, player #{@number}. What is your name?"

    @name = gets
  end
end

game = TicTacToe.new
game.play