Exercises: Read extra field "blocking_percentage" to block user attempts

BT#18068

main/exercise/exercise.class.php

@@ -6679,6 +6679,35 @@ class Exercise
                         $exerciseAttempts
                     );
                     $isVisible = false;
+                } else {
+                    // Check blocking exercise.
+                    $extraFieldValue = new ExtraFieldValue('exercise');
+                    $blockExercise = $extraFieldValue->get_values_by_handler_and_field_variable(
+                        $this->iId,
+                        'blocking_percentage'
+                    );
+                    if ($blockExercise && isset($blockExercise['value']) && !empty($blockExercise['value'])) {
+                        $blockPercentage = (int) $blockExercise['value'];
+                        $userAttempts = Event::getExerciseResultsByUser(
+                            api_get_user_id(),
+                            $this->iId,
+                            $this->course_id,
+                            $this->sessionId,
+                            $lpId,
+                            $lpItemId
+                        );
+
+                        if (!empty($userAttempts)) {
+                            $currentAttempt = current($userAttempts);
+                            if ($currentAttempt['total_percentage'] <= $blockPercentage) {
+                                $message = sprintf(
+                                    get_lang('ExerciseBlockBecausePercentageX'),
+                                    $blockPercentage
+                                );
+                                $isVisible = false;
+                            }
+                        }
+                    }
                 }
             }
         }

main/inc/lib/events.lib.php

@@ -1215,10 +1215,10 @@ class Event
         if (Database::num_rows($query) > 0) {
             $attempt = Database::fetch_array($query, 'ASSOC');
 
-            return $attempt['count'];
-        } else {
-            return 0;
+            return (int) $attempt['count'];
         }
+
+        return 0;
     }
 
     /**
@@ -1646,6 +1646,8 @@ class Event
             if (Database::num_rows($res_revised) > 0) {
                 $row['attempt_revised'] = 1;
             }
+            $row['total_percentage'] = ($row['exe_result'] / $row['exe_weighting']) * 100;
+
             $list[$row['exe_id']] = $row;
             $sql = "SELECT * FROM $table_track_attempt
                     WHERE exe_id = $exeId";