public function normalize()
{
$serialManager = new SerialManager($this->items);
$serialManager->normalize();
$reorder = [];
for ($i = 1; $i <= count($this->items); $i++) {
$reorder[] = $serialManager->locate($i);
}
if (count($reorder) !== count($this->items)) {
throw new \Exception('SerialManager did something completely wrong.');
}
$this->items = $reorder;
foreach ($this->items as $subItem) {
if ($subItem->sub()->hasChild()) {
$subItem->sub()->normalize();
}
}
}
private function normalizeTree(int $parentId = null)
{
$themes = $this->getThemesByParentId($parentId);
$serialManager = new SerialManager($themes);
$serialManager->normalize();
return $themes;
}