Disable ability to grade opponents after requesting improvements

view/src/main/java/se/su/dsv/scipro/finalseminar/SeminarOppositionPanel.html

@@ -58,6 +58,11 @@
                         </form>
 
                         <form wicket:id="request_improvements">
+                            <p>
+                                Once you request improvements the student have a limited time to make the requested changes.
+                                If they do not make the requested improvements in time, they will get an automatic failing grade.
+                                You will be notified when they've submitted a new report.
+                            </p>
                             <div class="mb-3">
                                 <label class="form-label" wicket:for="feedback_to_opponent">
                                     Provide feedback to the opponent on how to improve the opposition

view/src/main/java/se/su/dsv/scipro/finalseminar/SeminarOppositionPanel.java

@@ -323,12 +323,17 @@ public class SeminarOppositionPanel extends Panel {
         @Override
         protected void onConfigure() {
             super.onConfigure();
+            FinalSeminarOpposition opposition = getModelObject();
             setVisibilityAllowed(
                 startDateHasPassed() &&
-                getModelObject().getPoints() == null &&
-                getModelObject().getFeedback() == null &&
+                opposition.getPoints() == null &&
+                opposition.getFeedback() == null &&
                 isHeadSupervisor()
             );
+            boolean hasRequestedImprovements = opposition.getImprovementsRequestedAt() != null;
+            boolean reportIsSubmitted =
+                opposition.getOppositionReport() != null && opposition.getOppositionReport().isSubmitted();
+            setEnabled(!hasRequestedImprovements || reportIsSubmitted);
         }
     }