Departments.php

<?php
 
namespace Bitrix\Im\V2\Entity\Department;
 
use Bitrix\Im\V2\Entity\EntityCollection;
 
class Departments extends EntityCollection
{
    public function __construct(int ...$departmentIds)
    {
        parent::__construct();
 
        foreach ($departmentIds as $departmentId)
        {
            $this[] = new Department($departmentId);
        }
    }
 
    public function filterExist(): self
    {
        $filtered = new static();
 
        foreach ($this as $department)
        {
            if ($department->isExist())
            {
                $filtered[] = $department;
            }
        }
 
        return $filtered;
    }
 
    public function getDeepest(): self
    {
        $maxDepth = 0;
 
        foreach ($this as $department)
        {
            $maxDepth = max($maxDepth, $department->getDepth());
        }
 
        $newCollection = new static();
 
        foreach ($this as $department)
        {
            if ($department->getDepth() === $maxDepth)
            {
                $newCollection[] = $department;
            }
        }
 
        return $newCollection;
    }
 
    public static function getRestEntityName(): string
    {
        return 'departments';
    }
}