class WaterJug

  def initialize
    @jaroA = 3
    @jaroB = 2
    @a = 0
  	@b = 0
  	@goal = 1
  end

  def checkGoal
    fin = 0

    while(fin != 1)
      fin = 1 if @a.eql?(@goal) || @b.eql?(@goal)

      if @a.eql? 0
        fillA
      elsif @a > 0 && (@b != @jaroB)
        transferAtoB
      elsif @a > 0 && (@b.eql? @jaroB)
        emptyB
      end
    end
  end

  private

    def fillA
      @a = @jaroA
      puts "enche A => (A=#{@a}, B=#{@b})"
    end

    def fillB
      @b = @jaroB
      puts "enche B => (A=#{@a}, B=#{@b})"
    end

    def transferAtoB
      fin = 0

      while(fin != 1)
        @b += 1
        @a -= 1

        fin = 1 if @b.eql?(@jaroB) || @a.eql?(0)
      end

      puts "transfere de A para B => (A=#{@a}, B=#{@b})"
    end

    def emptyA
      @a = 0
      puts "esvazia A => (A=#{@a}, B=#{@b})"
    end

    def emptyB
      @b = 0
      puts "esvazia B => (A=#{@a}, B=#{@b})"
    end

end

WaterJug.new().checkGoal