class BackfillConstituenciesJob < ApplicationJob

  queue_as :low_priority

  def perform(id: 0, since: nil)

    return if Site.disable_constituency_api?

    since = since.try(:in_time_zone)

    signatures = signatures_missing_constituency_id(id, since).to_a

     max_id = signatures.map(&:id).max

    signatures.each do |signature|

      next if signature.constituency_id?

      if constituency = signature.constituency

        signature.update_column(:constituency_id, constituency.external_id)

      end

    end

    if reschedule?(max_id, since)

      self.class.perform_later(id: max_id, since: since.try(:iso8601))

    end

  end

  private

  def signatures_missing_constituency_id(id, since)

    Signature.missing_constituency_id(since: since).batch(id)

  end

  def reschedule?(id, since)

    signatures_missing_constituency_id(id, since).exists?

  end

end