# Copyright (C) 2012-2023 Zammad Foundation, https://zammad-foundation.org/

class Sequencer::Unit::Import::Zendesk::ObjectsTotalCount < Sequencer::Unit::Common::Provider::Attribute
  include ::Sequencer::Unit::Import::Common::Model::Statistics::Mixin::EmptyDiff

  uses :client

  private

  def statistics_diff
    %i[Groups Users Organizations Tickets].index_with do |object|
      empty_diff.merge(
        total: request(object).count!
      )
    end
  end

  # the special "incremental_export" logic is needed because Zendesk
  # archives records and doesn't return them via e.g. client.tickets
  # endpoint as described here:
  # https://github.com/zammad/zammad/issues/558#issuecomment-267951351
  # Counting via the incremental_export endpoint has the limitations
  # that it returns max. 1000. That's why we need to update the total
  # number while importing in the resource loop
  def request(object)
    require 'zendesk_api' # Only load this gem when it is really used.
    resource_class = "::ZendeskAPI::#{object.to_s.singularize}".safe_constantize
    if resource_class.respond_to?(:incremental_export)
      # read as: ::ZendeskAPI::Ticket.incremental_export(client, 1)
      resource_class.incremental_export(client, 1)
    else
      # read as: client.groups
      client.send(object.to_s.underscore.to_sym)
    end
  end
end