discard_draft_edition_service.rb

class DiscardDraftEditionService
  include Callable

  def initialize(edition, user, **)
    @edition = edition
    @user = user
  end

  def call
    raise "Only current editions can be deleted" unless edition.current?
    raise "Trying to delete a live edition" if edition.live?

    DeleteDraftAssetsService.call(edition)
    discard_draft(edition)
    reset_live_edition if document.live_edition
    DiscardPathReservationsService.call(edition) if edition.first?
    document.reload_current_edition
  end

private

  attr_reader :edition, :user

  delegate :document, to: :edition

  def reset_live_edition
    document.live_edition.update!(current: true)
    document.reload_live_edition
  end

  def discard_draft(edition)
    begin
      GdsApi.publishing_api.discard_draft(edition.content_id)
    rescue GdsApi::HTTPNotFound
      Rails.logger.warn("No draft to discard for content id #{edition.content_id}")
    rescue GdsApi::HTTPUnprocessableEntity => e
      no_draft_message = "There is not a draft edition of this document to discard"

      if e.error_details.respond_to?(:dig) && e.error_details.dig("error", "message") == no_draft_message
        Rails.logger.warn("No draft to discard for content id #{edition.content_id}")
      else
        raise
      end
    end

    AssignEditionStatusService.call(edition, user: user, state: :discarded)
    edition.update!(current: false)
  end
end