Refactored Minimax

gistfile1.rb

  def set_min_and_max_players(board)
    @max = MaxPlayer.new(board.next_player_symbol, -50)
    @min = MinPlayer.new(board.opponent_symbol, 50)
  end

  def minimax_score(board)
    score = game_value(board)
    return score unless score == -1 #-1 means a game is still in progress
    player = set_player(board.next_player_symbol)
    best_score = player.starting_score

    board.available_spaces.each do |space|
      test_board = copy(board)
      test_board.place_move(player.symbol, space)
      new_score = minimax_score(test_board)
      best_score = player.compare(best_score, new_score)
    end
    
    return best_score
  end
  
  def set_player(symbol)
    symbol == @max.symbol ? @max : @min
  end