module PopularityContest

# File lib/popularity_contest.rb, line 27
def self.all_popular(content_type, redis_connection)
  keys = redis_connection.keys(PopularityContest::key(content_type, '*'))

  hits = redis_connection.pipelined do
    keys.each do |key|
      redis_connection.mget(key)
    end
  end.flatten.collect{|hit| hit.to_i }
  # each of these hits is an array, flatten that
  # and convert the hits to integer
  # unfortunately Redis doesn't support the integer datatype as default

  # get all the content_ids
  # TODO: Do this after sorting
  content_ids = keys.collect{|key| PopularityContest::content_id_from_key(key) }


  # merge the three arrays: [keys, hits, content_ids]
  # [ "popular:type:event:id:66:date:13-04-18:count",
  #   "2",
  #   1337 ]
  # and sort them highest to lowest
  [keys, hits, content_ids].transpose.sort! { |x,y| y[1].to_i <=> x[1].to_i }
end

# File lib/popularity_contest.rb, line 17
def self.content_id_from_key(key)
  # 'popular:type:#{content_type}:id:12456:date:#{Date.today.strftime("%y-%m-%d")}:count'.scan(/id:(\d+)/i).flatten.first
  key.scan(/id:(\d+)/i).flatten.first.to_i
end

# File lib/popularity_contest.rb, line 7
def self.key(content_type, content_id, date = Date.today.strftime("%y-%m-%d"))
  key = []
  key << "popular"
  key << "type:#{content_type}"
  key << "id:#{content_id}"
  key << "date:#{date}"
  key << "hits"
  key.join(":")
end

# File lib/popularity_contest.rb, line 22
def self.most_popular(content_type, redis_connection, limit=10)
    limit = 10 if limit.nil? || !limit.is_a?(Integer) # make sure limit is right, else default
    all_popular(content_type, redis_connection).take(limit)
end