From 321c470a2356d038a6a0930779c9cd8a2b5f698c Mon Sep 17 00:00:00 2001
From: Kumi <git@kumi.email>
Date: Fri, 5 Jul 2024 12:02:11 +0200
Subject: [PATCH] feat: add event observer for course viewing

Introduces an event observer to inject JavaScript into courses containing the exp360 activity when the course is viewed.

The newly created `db/events.php` initializes event observers, while updates to `lib.php` define the event observer callback and the observer list. Enhancements to `global.js` include modal handling logic for improved UI interaction.

This aids in dynamically loading required scripts, enhancing user experience in courses with exp360 activities.
---
 db/events.php |  5 +++++
 global.js     | 23 +++++++++++++++++++++++
 lib.php       | 41 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 69 insertions(+)
 create mode 100644 db/events.php

diff --git a/db/events.php b/db/events.php
new file mode 100644
index 0000000..3ed930f
--- /dev/null
+++ b/db/events.php
@@ -0,0 +1,5 @@
+<?php
+
+defined('MOODLE_INTERNAL') || die();
+
+$observers = mod_exp360_get_event_observers();
\ No newline at end of file
diff --git a/global.js b/global.js
index 54c5780..813b4cd 100644
--- a/global.js
+++ b/global.js
@@ -1,4 +1,27 @@
 document.addEventListener("DOMContentLoaded", function () {
+
+  const modalHTML = `
+  <div id="fullScreenModal" class="modal" tabindex="-1"
+    aria-labelledby="modalLabel" aria-hidden="true">
+    <div style="background-color:#294084;" class="modal-dialog modal-fullscreen">
+      <div style="background-color:#294084;" class="modal-content">
+        <div style="background-color:#294084;" class="modal-body"><iframe style="background-color:#294084;" id="modal-iframe"></iframe></div>
+      </div>
+    </div>
+  </div>
+  <div id="regularModal" style="background: rgb(255,255,255,.7);" class="modal" tabindex="-2"
+    aria-labelledby="modalLabel" aria-hidden="true">
+    <div style="background-color:#294084;height:90%;" class="modal-dialog modal-lg">
+      <div style="background-color:#294084;height:100%;" class="modal-content">
+        <div style="background-color:#294084;" class="modal-body"><iframe style="background-color:#294084;width:100%;height:100%;" id="regular-modal-iframe"></iframe></div>
+      </div>
+    </div>
+  </div>
+`;
+
+  // Append the modal HTML to the document body
+  document.body.insertAdjacentHTML('beforeend', modalHTML);
+
   // Function to load a script into the DOM
   function loadScript(url, integrity, crossorigin) {
     return new Promise((resolve, reject) => {
diff --git a/lib.php b/lib.php
index 6ed97d7..da71247 100644
--- a/lib.php
+++ b/lib.php
@@ -56,3 +56,44 @@ function mod_exp360_cm_info_dynamic(cm_info $cm)
     $cm->set_no_view_link();
     $cm->set_content($script);
 }
+
+/**
+ * Event observer for mod_exp360.
+ */
+function mod_exp360_event_observer($event)
+{
+    global $PAGE, $DB;
+
+    // Get the course ID from the event.
+    $courseid = $event->courseid;
+
+    // Check if the course contains any instances of the exp360 activity.
+    $sql = "SELECT COUNT(*)
+              FROM {course_modules} cm
+              JOIN {modules} m ON cm.module = m.id
+              JOIN {exp360} e ON cm.instance = e.id
+             WHERE cm.course = :courseid
+               AND m.name = 'exp360'";
+    $params = ['courseid' => $courseid];
+    $count = $DB->count_records_sql($sql, $params);
+
+    // If the course contains at least one instance of exp360, inject the JavaScript.
+    if ($count > 0) {
+        $PAGE->requires->js('/mod/exp360/global.js');
+    }
+}
+
+/**
+ * Returns the list of event observers.
+ *
+ * @return array
+ */
+function mod_exp360_get_event_observers()
+{
+    return [
+        [
+            'eventname' => '\core\event\course_viewed',
+            'callback'  => 'mod_exp360_event_observer',
+        ],
+    ];
+}