fix(hooks): review hooks usage

ispapibackorder.php

@@ -21,16 +21,17 @@
 }
 
 use WHMCS\Database\Capsule;
+use WHMCS\View\Menu\Item as MenuItem;
 
 function ispapibackorder_config()
 {
     global $module_version;
     $configarray = array(
-    "name" => "ISPAPI Backorder",
-    "description" => "This addon allows you to provide backorders to your customers.",
-    "version" => $module_version,
-    "author" => "HEXONET",
-    "language" => "english"
+        "name" => "ISPAPI Backorder",
+        "description" => "This addon allows you to provide backorders to your customers.",
+        "version" => $module_version,
+        "author" => "HEXONET",
+        "language" => "english"
     );
     return $configarray;
 }
@@ -160,6 +161,35 @@ function ispapibackorder_logs_content($modulelink)
 
 function ispapibackorder_clientarea($vars)
 {
+    add_hook('ClientAreaPrimaryNavbar', 1, function (MenuItem $primaryNavbar) {
+        $key = "ispapibackorder";
+        $language = (isset($_SESSION["language"]) ? $_SESSION["language"] : "english");
+        $file = getcwd() . DIRECTORY_SEPARATOR . "modules" . DIRECTORY_SEPARATOR . "addons" . DIRECTORY_SEPARATOR . $key . DIRECTORY_SEPARATOR . "lang" . DIRECTORY_SEPARATOR . $language . ".php";
+        if (file_exists($file)){
+            include($file);
+        }
+
+        $primaryNavbar->addChild($key, array(
+            "label" => $_ADDONLANG["backorder_nav"],
+            "uri" => "index.php?m={$key}&p=manage",
+            "order" => "70"
+        ));
+
+        $pc = $primaryNavbar->getChild($key);
+        if (!is_null($pc)) {
+            $pc->addChild($key . "_manage", array(
+                "label" => $_ADDONLANG["managebackorders"],
+                "uri" => "index.php?m={$key}&p=manage",
+                "order" => "20"
+            ));
+            $pc->addChild($key . "_droplist", array(
+                "label" => $_ADDONLANG["domainheader"],
+                "uri" => "index.php?m={$key}&p=dropdomains",
+                "order" => "10"
+            ));
+        }
+    });
+
     $modulename = "ispapibackorder";
     $modulepath = "modules/addons/".$modulename;