class Array
  def same_values?
    self.uniq.length == 1
  end

  def contains? x
    self.include? x
  end
end

class Board

  attr_reader :spaces, :def_val, :winning_scens
  
  def initialize
    @def_val = "   "
    @spaces = Array.new(9, @def_val)
    @winning_scens = [[0,1,2],[3,4,5],[6,7,8],[0,3,6],[1,4,7],[2,5,8],[0,4,8],[2,4,6]]
  end

  def to_s
  "|#{@spaces[0]}|#{@spaces[1]}|#{@spaces[2]}|
-------------
|#{@spaces[3]}|#{@spaces[4]}|#{@spaces[5]}|
-------------
|#{@spaces[6]}|#{@spaces[7]}|#{@spaces[8]}|
-------------"
  end

  def get_free
    @spaces.each_index.select { |s| @spaces[s] == @def_val }
  end
  
  def set val, idx
    @spaces[idx] = val
  end

  def remove idx
    @spaces[idx] = @def_val
  end

  def any_winner?

    @winning_scens.each do |s|
      tmp = s.map {|i| @spaces[i]}
      if (not tmp.include? @def_val) and  tmp.same_values? then
        return true
      end
    end
    return false
  end

  def is_winner? player

    @winning_scens.each do |s|
      tmp = s.map {|i| @spaces[i]}
      if (not tmp.include? @def_val) and  tmp.same_values? and tmp[0] == player then
        return true
      end
    end
    return false
  end

  def is_full?
    get_free.empty?
  end
end