OOP implementation of tic tac toe

tictactoe_oop.rb

class Board
  attr_accessor :pos_1, :pos_2, :pos_3, :pos_4, :pos_5, :pos_6, :pos_7, :pos_8, :pos_9

  def initialize(pos_1, pos_2, pos_3, pos_4, pos_5, pos_6, pos_7, pos_8, pos_9)
    @pos_1 = pos_1
    @pos_2 = pos_2
    @pos_3 = pos_3
    @pos_4 = pos_4
    @pos_5 = pos_5
    @pos_6 = pos_6
    @pos_7 = pos_7
    @pos_8 = pos_8
    @pos_9 = pos_9
  end

  def print
    puts """
      #{pos_1}|#{pos_2}|#{pos_3}
      -----
      #{pos_4}|#{pos_5}|#{pos_6}
      -----
      #{pos_7}|#{pos_8}|#{pos_9}
     """
  end

  def row_1
    [pos_1, pos_2, pos_3]
  end

  def row_2
    [pos_4, pos_5, pos_6]
  end

  def row_3
    [pos_7, pos_8, pos_9]
  end

  def col_1
    [pos_1, pos_4, pos_7]
  end

  def col_2
    [pos_2, pos_5, pos_8]
  end

  def col_3
    [pos_3, pos_6, pos_9]
  end

  def diag_1
    [pos_1, pos_5, pos_9]
  end

  def diag_2
    [pos_3, pos_5, pos_7]
  end

  def mark_for(player)
    if (player.move == 1 && @pos_1 != ('x' || 'o'))
      @pos_1 = player.letter
    elsif (player.move == 2 && @pos_2 != ('x' || 'o'))
      @pos_2 = player.letter
    elsif (player.move == 3 && @pos_3 != ('x' || 'o'))
      @pos_3 = player.letter
    elsif (player.move == 4 && @pos_4 != ('x' || 'o'))
      @pos_4 = player.letter
    elsif (player.move == 5 && @pos_5 != ('x' || 'o'))
      @pos_5 = player.letter
    elsif (player.move == 6 && @pos_6 != ('x' || 'o'))
      @pos_6 = player.letter
    elsif (player.move == 7 && @pos_7 != ('x' || 'o'))
      @pos_7 = player.letter
    elsif (player.move == 8 && @pos_8 != ('x' || 'o'))
      @pos_8 = player.letter
    elsif (player.move == 9 && @pos_9 != ('x' || 'o'))
      @pos_9 = player.letter
    else
      InputOutput.invalid_input_msg
      player.select_move
    end
  end
end

class Player
  attr_accessor :name, :letter, :human, :move, :board

  def initialize(name, letter, is_human)
    @name   = name
    @letter = letter
    @human  = is_human
    @move   = nil
    @board  = nil
  end

  def select_move
    if human
      @move = InputOutput.choose_position
    else
      @move = Computer.choose_position(board, letter)
    end
  end

end

class Game
  attr_accessor :turns_left, :board, :player_1, :player_2

  def initialize(board, player_1, player_2)
    @turns_left    = 9
    @board         = board
    @player_1      = player_1
    @player_2      = player_2
  end

  def self.start!
    setup_game
  end

  def play
    if @turns_left.odd?
      board.print
      player_1.select_move
      board.mark_for(player_1)
    else
      board.print
      player_2.select_move
      board.mark_for(player_2)
    end

    if @turns_left < 4 && victory_condition_met?
      InputOutput.victory_msg(@turns_left)
      exit
    end

    if @turns_left == 1
      InputOutput.draw_msg
      exit
    end
    @turns_left = @turns_left - 1
    play
  end

  def victory_condition_met?
    board.row_1.uniq.length  == 1 ||
    board.row_2.uniq.length  == 1 ||
    board.row_3.uniq.length  == 1 ||
    board.col_1.uniq.length  == 1 ||
    board.col_2.uniq.length  == 1 ||
    board.col_3.uniq.length  == 1 ||
    board.diag_1.uniq.length == 1 ||
    board.diag_2.uniq.length == 1
  end

  def self.setup_game
    InputOutput.welcome
    player_name   = InputOutput.get_player_name
    player_choice = InputOutput.choose_x_or_o

    if player_choice == 'x'
      player_1 = Player.new(player_name, player_choice, true)
      player_2 = Player.new('Computer', 'o', false)
    else
      player_1 = Player.new('Computer', 'x', false)
      player_2 = Player.new(player_name, player_choice, true)
    end
    board = Board.new(1, 2, 3, 4, 5, 6, 7, 8, 9)
    player_1.board = board
    player_2.board = board
    new_game = Game.new(board, player_1, player_2)
    new_game.play
  end
end

class InputOutput
  def self.welcome
    puts "Welcome"
  end

  def self.get_player_name
    puts "What is your name?"
    gets.chomp
  end

  def self.invalid_input_msg
    puts "Please Select a valid input"
  end

  def self.choose_x_or_o
    puts "Choose 'X' or 'O' --- X goes first"

    input = gets.chomp.downcase

    if input == 'x'
      puts 'Ready Player 1'
      input
    elsif input == 'o'
      puts 'Ready Player 2'
      input
    else
      self.invalid_input_msg
      self.choose_x_or_o
    end
  end

  def self.choose_position
    puts 'choose 1-9'
    input = gets.chomp

    if input.to_i.integer? && input.to_i > 0 && input.to_i < 10
      input.to_i
    else
      self.invalid_input_msg
      self.choose_position
    end
  end

  def self.victory_msg(turn)
    if turn.odd?
      puts "You've Won!"
    else
      puts "Better luck next time!"
    end
  end

  def self.draw_msg
    puts "Draw!"
  end

end

class Computer

  def self.choose_position(board,letter)
    self.win_if_able(board,letter)
    self.block_win(board,letter)
    self.fork_if_able(board)
    #self.block_center
    rand(1..9)
  end

  def self.win_if_able(board,letter)
    1 if (board.pos_2 == board.pos_3 && board.pos_3 == letter) || (board.pos_4 == board.pos_7 && board.pos_7== letter) || (board.pos_5 == board.pos_9 && board.pos_9 == letter)
    2 if (board.pos_1 == board.pos_3 && board.pos_3 == letter) || (board.pos_5 == board.pos_8 && board.pos_8== letter)
    3 if (board.pos_1 == board.pos_2 && board.pos_2 == letter) || (board.pos_6 == board.pos_9 && board.pos_9== letter) || (board.pos_5 == board.pos_7 && board.pos_7 == letter)
    4 if (board.pos_1 == board.pos_7 && board.pos_7 == letter) || (board.pos_5 == board.pos_6 && board.pos_6== letter)
    5 if (board.pos_1 == board.pos_9 && board.pos_9 == letter) || (board.pos_3 == board.pos_7 && board.pos_7== letter) || (board.pos_2 == board.pos_8 && board.pos_8 == letter) || (board.pos_4 == board.pos_6 && board.pos_6 == letter)
    6 if (board.pos_4 == board.pos_5 && board.pos_5 == letter) || (board.pos_3 == board.pos_9 && board.pos_9== letter)
    7 if (board.pos_1 == board.pos_4 && board.pos_4 == letter) || (board.pos_3 == board.pos_5 && board.pos_5== letter) || (board.pos_8 == board.pos_9 && board.pos_9 == letter)
    8 if (board.pos_7 == board.pos_9 && board.pos_9 == letter) || (board.pos_2 == board.pos_5 && board.pos_5== letter)
    9 if (board.pos_1 == board.pos_4 && board.pos_4 == letter) || (board.pos_3 == board.pos_6 && board.pos_6== letter) || (board.pos_8 == board.pos_7 && board.pos_7 == letter)
  end

  def self.block_win(board,letter)
    # 1 if (board.pos_2 == board.pos_3 != letter) || (board.pos_4 == board.pos_7 != letter) || (board.pos_5 == board.pos_9 != letter)
    # 2 if (board.pos_1 == board.pos_3 != letter) || (board.pos_5 == board.pos_8 != letter)
    # 3 if (board.pos_1 == board.pos_2 != letter) || (board.pos_6 == board.pos_9 != letter) || (board.pos_5 == board.pos_7 != letter)
    # 4 if (board.pos_1 == board.pos_7 != letter) || (board.pos_5 == board.pos_6 != letter)
    # 5 if (board.pos_1 == board.pos_9 != letter) || (board.pos_3 == board.pos_7 != letter) || (board.pos_2 == board.pos_8 != letter) || (board.pos_4 != board.pos_6 != letter)
    # 6 if (board.pos_4 == board.pos_5 != letter) || (board.pos_3 == board.pos_9 != letter)
    # 7 if (board.pos_1 == board.pos_4 != letter) || (board.pos_3 == board.pos_5 != letter) || (board.pos_8 == board.pos_9 != letter)
    # 8 if (board.pos_7 == board.pos_9 != letter) || (board.pos_2 == board.pos_5 != letter)
    # 9 if (board.pos_1 == board.pos_4 != letter) || (board.pos_3 == board.pos_5 != letter) || (board.pos_8 == board.pos_9 != letter)
  end

  def self.fork_if_able(board)
    # if !board.pos_5.integer?
    #   1 if pos_2.integer? && pos_3.integer? && pos_7.integer? && pos_4.integer? && pos_1.integer?
    #   3 if pos_2.integer? && pos_1.integer? && pos_6.integer? && pos_9.integer? && pos_3.integer?
    #   9 if pos_6.integer? && pos_3.integer? && pos_7.integer? && pos_8.integer? && pos_9.integer?
    #   7 if pos_1.integer? && pos_4.integer? && pos_8.integer? && pos_9.integer? && pos_7.integer?
    # end
  end

  def self.block_fork
    board_state1 = [board.row1,  board.row_2, board.row_3]
    board_state2 = [board.col_1, board.col_2, board.col_3]
  end

  def self.play_center
    5
  end

  def self.play_opposite_corner
    #
  end

  def self.play_empty_corner
    #
  end

  def self.play_empty_side
    #
  end
end

Game.start!