Simple game of tictactoe

tictactoe.rb

require 'set'

class TicTacToe

  WINNING_LINES = [
    Set.new([0, 1, 2]),
    Set.new([0, 3, 6]),
    Set.new([0, 4, 8]),
    Set.new([1, 4, 7]),
    Set.new([2, 5, 8]),
    Set.new([2, 4, 6]),
    Set.new([3, 4, 5]),
    Set.new([6, 7, 8])
  ].freeze

  attr_reader :players
  Player = Struct.new(:name, :moves)

  def initialize(player1, player2)
    @players = []
    @players << Player.new(player1, Set.new)
    @players << Player.new(player2, Set.new)
  end

  def move(position)
    return puts 'Move taken or invalid' unless available_move?(position)

    take_turn do |player|
      player.moves.add(position)
      determine_game_standing
    end

    puts "#{current_player.name}'s turn"
  end

  def available_moves
    Set[*(0..8).to_a] - taken_moves
  end

  private

  def tie?
    available_moves.empty? && !winner?
  end

  def determine_game_standing
    notify_winner if winner?
    notify_of_tie if tie?
    reset if (tie? || winner?)
  end

  def available_move?(position)
    available_moves.include?(position)
  end

  def notify_winner
    puts "#{current_player.name} wins!"
  end

  def notify_tie
    puts 'It\'s a tie!'
  end

  def taken_moves
    players[0].moves | players[1].moves
  end

  def reset
    players.each { |p| p.moves.clear }
  end

  def winner?
    WINNING_LINES.any? { |l| l == current_player.moves }
  end

  def current_player
    players.first
  end

  def take_turn
    yield current_player
    players.rotate!
  end

end