🎁 Add logic for snippets when splitting PDFs

This commit will add logic to add the ability to see search snippets
with PDFs that were split through IIIF Print.

app/indexers/concerns/hyku_indexing.rb

@@ -22,7 +22,7 @@ module HykuIndexing
  solr_doc['valkyrie_bsi'] = object.kind_of?(Valkyrie::Resource)
  solr_doc['member_ids_ssim'] = object.member_ids.map(&:id) if object.kind_of?(Valkyrie::Resource)
  # TODO: Reinstate once valkyrie fileset work is complete - https://github.com/scientist-softserv/hykuup_knapsack/issues/34
- solr_doc['all_text_tsimv'] = full_text(Hyrax.custom_queries.find_child_file_sets(resource: resource).first.id.to_s)
+ solr_doc['all_text_tsimv'] = full_text(object)
  # rubocop:enable Style/ClassCheck
  solr_doc['title_ssim'] = SortTitle.new(object.title.first).alphabetical
  solr_doc['depositor_ssi'] = object.depositor
@@ -38,12 +38,39 @@ module HykuIndexing
 
  private
 
- def full_text(file_set_id)
- return if !Flipflop.default_pdf_viewer? || file_set_id.blank?
+ def full_text(object)
+ child_works = Hyrax.custom_queries.find_child_works(resource: object)
+
+ if child_works.empty?
+ extract_text_from_pdf_directly(object)
+ else
+ file_set_texts = child_works_file_sets(child_works).map { |fs| all_text(fs) }.select(&:present?)
+ if file_set_texts.join.blank?
+ extract_text_from_pdf_directly(object)
+ else
+ file_set_texts.join("\n---------------------------\n")
+ end
+ end
+ end
+
+ def extract_text_from_pdf_directly(object)
+ file_set_id = Hyrax.custom_queries.find_child_file_sets(resource: object).first&.id&.to_s
+ return if file_set_id.blank?
 
  SolrDocument.find(file_set_id)['all_text_tsimv']
  end
 
+ def child_works_file_sets(child_works)
+ child_works.map { |child_work| Hyrax.custom_queries.find_child_file_sets(resource: child_work) }.flatten
+ end
+
+ def all_text(fs)
+ text = IiifPrint::Data::WorkDerivatives.data(from: fs, of_type: 'txt') || ''
+ return text if text.empty?
+
+ text.tr("\n", ' ').squeeze(' ')
+ end
+
  def add_date(solr_doc)
  date_string = solr_doc['date_created_tesim']&.first
  return unless date_string