class Tag
  include Mongoid::Document
  include Mongoid::Timestamps
  include Impressionist::Impressionable
  
  is_impressionable :counter_cache => { :column_name => :view_count }
  field :key
  #field :cloud_amper,:type: Integer,:default=> 0 
  belongs_to :module_app
  
  def cloud_amper
    for_now = {:start_at=>20.days.ago,:end_at=>Time.now}
    for_yesterday = {:start_at=>19.days.ago,:end_at=>1.days.ago}

    range = self.class.all.collect{ |tag|
      get_impressionist_diff(tag)
    }
    (get_impressionist_diff - range.min).abs
  end

protected
  def get_impressionist_diff(item_tag = self)
      for_now = item_tag.impressionist_count(:start_date=>20.days.ago,:end_date=>Time.now)
      for_yesterday = item_tag.impressionist_count(:start_date=>21.days.ago,:end_date=>1.days.ago)
      for_now - for_yesterday
  end

end