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# frozen_string_literal: true
class Trends::History
include Enumerable
class Aggregate
include Redisable
def initialize(prefix, id, date_range)
@days = date_range.map { |date| Day.new(prefix, id, date.to_time(:utc)) }
end
def uses
redis.mget(*@days.map { |day| day.key_for(:uses) }).map(&:to_i).sum
end
def accounts
redis.pfcount(*@days.map { |day| day.key_for(:accounts) })
end
end
class Day
include Redisable
EXPIRE_AFTER = 14.days.seconds
def initialize(prefix, id, day)
@prefix = prefix
@id = id
@day = day.beginning_of_day
end
attr_reader :day
def accounts
redis.pfcount(key_for(:accounts))
end
def uses
redis.get(key_for(:uses))&.to_i || 0
end
def add(account_id)
redis.pipelined do
redis.incrby(key_for(:uses), 1)
redis.pfadd(key_for(:accounts), account_id)
redis.expire(key_for(:uses), EXPIRE_AFTER)
redis.expire(key_for(:accounts), EXPIRE_AFTER)
end
end
def as_json
{ day: day.to_i.to_s, accounts: accounts.to_s, uses: uses.to_s }
end
def key_for(suffix)
case suffix
when :accounts
"#{key_prefix}:#{suffix}"
when :uses
key_prefix
end
end
def key_prefix
"activity:#{@prefix}:#{@id}:#{day.to_i}"
end
end
def initialize(prefix, id)
@prefix = prefix
@id = id
end
def get(date)
Day.new(@prefix, @id, date)
end
def add(account_id, at_time = Time.now.utc)
Day.new(@prefix, @id, at_time).add(account_id)
end
def aggregate(date_range)
Aggregate.new(@prefix, @id, date_range)
end
def each(&block)
if block_given?
(0...7).map { |i| block.call(get(i.days.ago)) }
else
to_enum(:each)
end
end
def as_json(*)
map(&:as_json)
end
end
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