-function quattro_init(&$a) {
- $a->page['htmlhead'] .= '<script src="'.$a->get_baseurl().'/view/theme/quattro/tinycon.min.js"></script>';
- $a->page['htmlhead'] .= '<script src="'.$a->get_baseurl().'/view/theme/quattro/js/quattro.js"></script>';;
+use Friendica\App;
+use Friendica\DI;
+
+/*
+ * This script can be included even when the app is in maintenance mode which requires us to avoid any config call
+ */
+
+function quattro_init(App $a) {
+ DI::page()['htmlhead'] .= '<script src="'.DI::baseUrl().'/view/theme/quattro/tinycon.min.js"></script>';
+ DI::page()['htmlhead'] .= '<script src="'.DI::baseUrl().'/view/theme/quattro/js/quattro.js"></script>';;
+}
+
+/**
+ * @param int|null $uid
+ * @return null
+ * @see \Friendica\Core\Theme::getBackgroundColor()
+ * @TODO Implement this function
+ */
+function quattro_get_background_color(int $uid = null)
+{
+ return null;
+}
+
+/**
+ * @param int|null $uid
+ * @return null
+ * @see \Friendica\Core\Theme::getThemeColor()
+ * @TODO Implement this function
+ */
+function quattro_get_theme_color(int $uid = null)
+{
+ return null;