🎁 Service to split previously ingested pdf

lib/iiif_print/split_pdfs/pdf_child_works_service.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module IiifPrint
+  module SplitPdfs
+    ## Encapsulates logic for cleanup when the PDF is destroyed after pdf splitting into child works
+    class PdfChildWorksService
+      def self.create_pdf_child_works_for(file_set:, user:)
+        locations = pdfs_only_for([Hyrax::WorkingDirectory.find_or_retrieve(file.id, file_set.id)])
+        return if locations.empty?
+        work = file_set.parent
+
+        # clean up any existing spawned child works of this file_set
+        IiifPrint::SplitPdfs::DestroyPdfChildWorksService.conditionally_destroy_spawned_children_of(
+          file_set: file_set,
+          work: work
+        )
+
+        # submit a job to split pdf into child works
+        work.iiif_print_config.pdf_splitter_job.perform_later(
+          file_set,
+          locations,
+          user,
+          work.admin_set_id,
+          0 # A no longer used parameter; but we need to preserve the method signature (for now)
+        )
+      end
+
+      # @todo: can we use mimetype instead?
+      def self.pdfs_only_for(paths)
+        paths.select { |path| path.end_with?('.pdf', '.PDF') }
+      end
+    end
+  end
+end