From a1b38e4f8c2335d6a70dc7effe49db2c4d359015 Mon Sep 17 00:00:00 2001
From: Odei Alba <odeialba@gmail.com>
Date: Thu, 19 Aug 2021 17:24:14 +0200
Subject: [PATCH] MDL-68325 completion: Add validation to course completion
 form

---
 course/completion_form.php | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/course/completion_form.php b/course/completion_form.php
index 937a0eee150..def50c66aa6 100644
--- a/course/completion_form.php
+++ b/course/completion_form.php
@@ -266,4 +266,31 @@ class course_completion_form extends moodleform {
             $mform->addElement('cancel');
         }
     }
+
+    /**
+     * Form validation
+     *
+     * @param array $data
+     * @param array $files
+     * @return array
+     */
+    public function validation($data, $files) {
+        $errors = [];
+
+        if (!isset($data['criteria_course']) || $data['criteria_course'] === 0) {
+            return $errors;
+        }
+
+        foreach ($data['criteria_course'] as $courseid) {
+            $course = get_course($courseid);
+            $completioninfo = new completion_info($course);
+
+            if (! $completioninfo->is_enabled()) {
+                $errors[] = get_string('completionnotenabledforcourse', 'completion');
+                break;
+            }
+        }
+
+        return $errors;
+    }
 }