pick crowd winners

pick.rb

class PickCrowdWinners
  attr_accessor :crowd_drawing, :ids

  def initialize(crowd_drawing)
    @crowd_drawing = crowd_drawing
  end

  def ids
    @ids ||= begin
      ids               = Set.new
      key               = CrowdMember.monthly_rank_key(crowd_drawing.brand_id, 1.month.ago)
      entries_key       = crowd_drawing.send(:entries_key)
      number_of_entries = $redis.llen( entries_key )
      number_of_prizes  = crowd_drawing.prizes.map(&:quantity).sum
      number_of_members = $redis.zcount(key, CrowdMember::POINTS_PER_ENTRY, '+inf')
      number_of_winners = [number_of_prizes, number_of_members].min

      progress = ProgressBar.create(:title => "#{crowd_drawing.brand.slug}", :total => number_of_winners, :format => '%t |%b[%P%%]%i| %c/%C [%E]')
      while ids.size < number_of_winners
        id = $redis.lindex(entries_key, rand(number_of_entries))
        if CrowdMember.find(id).member.eligible_to_win?
          progress.increment
          ids << id
        else
          puts "#{id} is ineligible"
        end
      end
      ids
    end
  end

  def crowd_members
    @crowd_members ||= CrowdMember.find(ids.to_a)
  end

  def run!
    crowd_drawing.prizes.each do |prize|
      crowd_members.shift(prize.quantity).each do |crowd_member|
        PrizeWin.create({
          :drawing_id      => crowd_drawing.id,
          :crowd_member_id => crowd_member.id,
          :member_id       => crowd_member.member_id,
          :brand_id        => crowd_drawing.brand_id,
          :prize_id        => prize.id,
          :points          => crowd_member.last_months_points_total,
          :entries         => crowd_member.last_months_entries
        })
      end
    end
  end
end

CrowdDrawing.last_month.each do |crowd_drawing|
  wins              = PrizeWin.between(:created_at => Time.now.utc.at_beginning_of_day..Time.now.utc).where(:drawing_id => crowd_drawing.id)
  number_of_prizes  = crowd_drawing.prizes.map(&:quantity).sum
  number_of_winners = wins.count
  diff              = number_of_prizes - number_of_winners

  if diff > 0
    wins.destroy_all
    PickCrowdWinners.new(crowd_drawing).run!
  end
end