class SlotMachine
  #          0         1       2        3       4
  OPTIONS = ["cherry", "seven", "bell", "star", "joker"]

  def score(reels)
    if 3  == reels.uniq.size
      return 0
    elsif 2 == reels.uniq.size && reels.include?("joker")
      # we sort then take the middle one to find out which
      # one was the duplicate (see bottom of file)
      reel = reels.sort[1]

      # use the Array#index method to find out the index
      # of our reels
      return (OPTIONS.index(reel) + 1) * 5
      # eg: seven is index 1,
      # 1 + 1 is 2,
      # 2 * 5 is 10

    elsif reels.uniq.size == 1
      # we grab one from reels, doesn't matter which one
      # because they are all the same in this case
      reel = reels.sample

      # use the Array#index method to find out the index
      # of our reels
      return (OPTIONS.index(reel) + 1) * 10
      # eg: joker is index 4,
      # 4 + 1 is 5,
      # 5 * 10 is 50
    end
  end
end

# indexes            0  1  2
# [b, a, b].sort => [a, b, b]
# [b, b, a].sort => [a, b, b]
# [a, b, b].sort => [a, b, b]
# [b, a, a].sort => [a, a, b]