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# frozen_string_literal: true
class Trends::Base
include Redisable
class_attribute :default_options
attr_reader :options
# @param [Hash] options
# @option options [Integer] :threshold Minimum amount of uses by unique accounts to begin calculating the score
# @option options [Integer] :review_threshold Minimum rank (lower = better) before requesting a review
# @option options [ActiveSupport::Duration] :max_score_cooldown For this amount of time, the peak score (if bigger than current score) is decayed-from
# @option options [ActiveSupport::Duration] :max_score_halflife How quickly a peak score decays
def initialize(options = {})
@options = self.class.default_options.merge(options)
end
def register(_status)
raise NotImplementedError
end
def add(*)
raise NotImplementedError
end
def refresh(*)
raise NotImplementedError
end
def request_review
raise NotImplementedError
end
def get(*)
raise NotImplementedError
end
def score(id)
redis.zscore("#{key_prefix}:all", id) || 0
end
def rank(id)
redis.zrevrank("#{key_prefix}:allowed", id)
end
def currently_trending_ids(allowed, limit)
redis.zrevrange(allowed ? "#{key_prefix}:allowed" : "#{key_prefix}:all", 0, limit.positive? ? limit - 1 : limit).map(&:to_i)
end
protected
def key_prefix
raise NotImplementedError
end
def recently_used_ids(at_time = Time.now.utc)
redis.smembers(used_key(at_time)).map(&:to_i)
end
def record_used_id(id, at_time = Time.now.utc)
redis.sadd(used_key(at_time), id)
redis.expire(used_key(at_time), 1.day.seconds)
end
def trim_older_items
redis.zremrangebyscore("#{key_prefix}:all", '-inf', '(1')
redis.zremrangebyscore("#{key_prefix}:allowed", '-inf', '(1')
end
def score_at_rank(rank)
redis.zrevrange("#{key_prefix}:allowed", 0, rank, with_scores: true).last&.last || 0
end
private
def used_key(at_time)
"#{key_prefix}:used:#{at_time.beginning_of_day.to_i}"
end
end
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