tasks: add progress report to the pjs migration task

Progress is indicated per migrated champ.

lib/tasks/pieces_justificatives.rake

@@ -3,9 +3,18 @@ require Rails.root.join("lib", "tasks", "task_helper")
 namespace :pieces_justificatives do
   task migrate_procedure_to_champs: :environment do
     procedure_id = ENV['PROCEDURE_ID']
+    procedure = Procedure.find(procedure_id)
+
     service = PieceJustificativeToChampPieceJointeMigrationService.new
     service.ensure_correct_storage_configuration!
-    service.convert_procedure_pjs_to_champ_pjs(Procedure.find(procedure_id))
+
+    progress = ProgressReport.new(service.number_of_champs_to_migrate(procedure))
+
+    service.convert_procedure_pjs_to_champ_pjs(procedure) do
+      progress.inc
+    end
+
+    progress.finish
   end
 
   task migrate_procedures_range_to_champs: :environment do
@@ -18,11 +27,20 @@ namespace :pieces_justificatives do
     service.ensure_correct_storage_configuration!
     procedures_to_migrate = service.procedures_with_pjs_in_range(procedures_range)
 
+    total_number_of_champs_to_migrate = procedures_to_migrate
+      .map { |p| service.number_of_champs_to_migrate(p) }
+      .sum
+    progress = ProgressReport.new(total_number_of_champs_to_migrate)
+
     procedures_to_migrate.find_each do |procedure|
       rake_puts ''
       rake_puts "Migrating procedure #{procedure.id}…"
 
-      service.convert_procedure_pjs_to_champ_pjs(procedure)
+      service.convert_procedure_pjs_to_champ_pjs(procedure) do
+        progress.inc
+      end
     end
+
+    progress.finish
   end
 end