module Mercy
  class Report::ActiveRecord < Report
    expose :period, type: :period
    expose :clazz, :base_scope, case: :snake

    private

    def fetch_scoped(base, scope)
      if (scope.is_a?(Symbol))
        scope.to_s.split('.').inject(base) do |entries, method|
          entries.public_send(method)
        end
      else
        base.where(scope)
      end
    end

    def last_entries
      @last_entries ||= base.where('updated_at >= ?', period.seconds.ago)
    end

    def base
      fetch_scoped(clazz, base_scope)
    end
  end
end