# Copyright (C) 2012-2024 Zammad Foundation, https://zammad-foundation.org/

class Sequencer::Unit::Import::Exchange::FolderContacts::SubSequence < Sequencer::Unit::Base
  include ::Sequencer::Unit::Exchange::Folders::Mixin::Folder
  include ::Sequencer::Unit::Import::Common::SubSequence::Mixin::ImportJob

  uses :ews_folder_ids

  def process
    return if ews_folder_ids.blank?

    ews_folder_ids.each do |folder_id|
      folder = ews_folder.find(folder_id)
      paginated_item_sequence(folder)
    end
  end

  private

  def paginated_item_sequence(folder)

    total    = folder.total_count
    per_page = 1000
    pages    = (total.to_f / per_page).ceil

    display_path = ews_folder.display_path(folder)
    (1..pages).each do |page|

      offset = (page - 1) * per_page

      opts = {
        indexed_page_item_view: {
          max_entries_returned: per_page,
          offset:               offset,
          base_point:           'Beginning'
        }
      }

      logger.debug { "Fetching and processing #{per_page} items (page: #{page}, offset: #{offset}) from Exchange folder '#{display_path}' (total: #{total})" }

      process_folders(folder, display_path, opts)
    end
  end

  def process_folders(folder, display_path, opts)
    folder.items(opts).each do |item|

      sequence_resource do |parameters|

        logger.debug { "Extracting attributes from Exchange item: #{item.get_all_properties!.inspect}" }

        parameters.merge(
          resource:        ::Import::Exchange::ItemAttributes.extract(item),
          ews_folder_name: display_path,
        )
      rescue => e
        Rails.logger.error 'Unable to process Exchange folder item'
        Rails.logger.debug { item.inspect }
        Rails.logger.error e
        nil
      end
    end
  end

  def sequence
    'Import::Exchange::FolderContact'
  end
end