delete/add an activity to the matrix if it's deleted/duplicated

block_competency_iena.php

 <?php
 
-require_once('entity/block_competency_iena_competency.php');
+defined('MOODLE_INTERNAL') || die();
 
-class block_competency_iena extends block_base
-{
+class block_competency_iena extends block_base{
     public function init()
     {
         $this->title = get_string('title_plugin', 'block_competency_iena');
@@ -93,6 +92,8 @@ class block_competency_iena extends block_base
             
             return $this->content;
         }
-	}
 
-	?>
\ No newline at end of file
+        
+
+}
+?>
\ No newline at end of file

classes/observer.php

+<?php
+defined('MOODLE_INTERNAL') || die();
+//require_once($CFG->dirroot.'/blocks/competency_iena/block_competency_iena.php');
+require_once($CFG->dirroot.'/blocks/competency_iena/lib.php');
+
+class block_competency_iena_observer {
+    /**
+     * Observer that monitors course module suppressed event and update the linked matrix competencies .
+     *
+     * @param \core\event\course_module_deleted $event the event object.
+     */
+    public static function course_module_deleted(\core\event\course_module_deleted $event) {
+        $cmid = $event->contextinstanceid;
+        delete_matrix_competencies($cmid);
+    }
+
+    public static function course_module_created(\core\event\course_module_created $event) {
+        $cmid = $event->contextinstanceid;
+        duplicate_matrix_competencies($cmid, );
+    }
+}

db/events.php

+<?php
+defined('MOODLE_INTERNAL') || die();
+
+$observers = array(
+    array(
+        'eventname'   => '\core\event\course_module_deleted',
+        'callback'    => 'block_competency_iena_observer::course_module_deleted',
+    ),
+    array(
+        'eventname'   => '\core\event\course_module_created',
+        'callback'    => 'block_competency_iena_observer::course_module_created',
+    )
+);
+
+?>
\ No newline at end of file

lib.php

+<?php
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Delete an activity from the matrix when it's deleted from a course
+ * @param int $moduleid 
+ */
+function delete_matrix_competencies($moduleid){
+    global $DB;
+    $activity=$DB->record_exists('block_competency_iena', array('cmid' => $moduleid));
+    if($activity){
+        $DB->delete_records('block_competency_iena', array('cmid' => $moduleid));
+    }
+    
+
+}
+
+/**
+ * Add an activity to the matrix when it's duplicated (if the new one is linked to competencies). Moodle automatically add the corresponding competencies to the new activity, so we just have to check that to add it to the matrix if necessary
+ * @param int $moduleid 
+ */
+function duplicate_matrix_competencies($moduleid){
+    global $DB;
+    $sql = "SELECT mc.cmid, m.section FROM {competency_modulecomp} mc JOIN {course_modules} m ON mc.cmid=m.id WHERE mc.cmid= :moduleid";
+    $params=array('moduleid'=>$moduleid);
+    $activity=$DB->get_record_sql($sql, $params);
+    if($activity){
+         $DB->insert_record('block_competency_iena', array('cmid' => $activity->cmid, 'sectionid'=>$activity->section));
+    }   
+
+}
\ No newline at end of file