implementation of import wip

app/services/proforma_service/import.rb

@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+
+module ProformaService
+  class Import < ServiceBase
+    def initialize(zip:, user:)
+      @zip = zip
+      @user = user
+    end
+
+    def execute
+      if single_task?
+        importer = Proforma::Importer.new(@zip)
+        @task = importer.perform
+        exercise = ConvertTaskToExercise.call(task: @task, user: @user)
+        exercise.save!
+
+        exercise
+      else
+        import_multi
+      end
+    end
+
+    private
+
+    def import_multi
+      Zip::File.open(@zip.path) do |zip_file|
+        zip_files = zip_file.filter { |entry| entry.name.match?(/\.zip$/) }
+        begin
+          zip_files.map! do |entry|
+            store_zip_entry_in_tempfile entry
+          end
+          zip_files.map do |proforma_file|
+            Import.call(zip: proforma_file, user: @user)
+          end
+        ensure
+          zip_files.each(&:unlink)
+        end
+      end
+    end
+
+    def store_zip_entry_in_tempfile(entry)
+      tempfile = Tempfile.new(entry.name)
+      tempfile.write entry.get_input_stream.read.force_encoding('UTF-8')
+      tempfile.rewind
+      tempfile
+    end
+
+    def single_task?
+      filenames = Zip::File.open(@zip.path) do |zip_file|
+        zip_file.map(&:name)
+      end
+
+      filenames.select { |f| f[/\.xml$/] }.any?
+    # rescue Zip::Error
+    # raise Proforma::InvalidZip
+    end
+  end
+end