Gets department ID for AD user If department doesn exist creates new o

// Gets department ID for AD user. If department doesn't exist, creates a new one. Returns FALSE if there should be no department set.
	// returns array:
	// 'ID' - department id
	// 'IS_HEAD' - true if this user is head of the department, false if not
	function GetDepartmentIdForADUser($department, $managerDN, $username, &$cache=FALSE, $iblockId = FALSE, $names = FALSE)
	{
		global $APPLICATION;

		// check for loops in manager structure, if loop is found - quit
		// should be done before cache lookup
		if ($names && isset($names[$username]))
			return false;

		// if department id for this user is already stored in cache
		if ($cache)
		{
			$departmentCached = $cache[$username];
			// if user was not set as head earlier, then do not get his id from cache
			if ($departmentCached)
				return $departmentCached;
		}

		// if it is a first call in recursive chain
		if (!$iblockId)
		{
			// check module inclusions
			if (!IsModuleInstalled('intranet') || !CModule::IncludeModule('iblock'))
				return false;

			// get structure's iblock id
			$iblockId=COption::GetOptionInt("intranet", "iblock_structure",  false, false);
			if (!$iblockId)
				return false;

			$names = array();
		}

		// save current username as already visited
		$names[$username] = true;

		// manager's department ID
		$managerDepId = false;

		// if there's a manager - query it
		if ($managerDN)
		{
			$user = substr($managerDN, 0, strpos($managerDN, ','));

			$userArr = $this->GetUserArray($user);
			if (count($userArr)>0)
			{
				// contents of userArr are already in local encoding, no need for conversion here
				$mgrDepartment = $userArr[0][$this->arFields['USER_DEPARTMENT_ATTR']];
				if ($mgrDepartment && trim($mgrDepartment)!='')
				{
					// if manager's department name is set - then get it's id
					$mgrManagerDN = $userArr[0][$this->arFields['USER_MANAGER_ATTR']];
					$mgrUserName = $userArr[0][$this->arFields['USER_ID_ATTR']];
					$arManagerDep = $this->GetDepartmentIdForADUser($mgrDepartment, $mgrManagerDN, $mgrUserName, $cache, $iblockId, $names);
					// fill in cache
					if ($cache && $arManagerDep)
						$cache[$mgrUserName] = $arManagerDep;
				}
			}
		}

		// prepare result and create department (if needed)
		$arResult = array('IS_HEAD'=>true); // by default, thinking of user as a head of the department

		if ($arManagerDep)
		{ // if got manager's data correctly
			if ($department && trim($department)!='' && ($mgrDepartment!=$department))
			{ // if our department is set && differs from manager's, set manager's as parent
				$parentSectionId = $arManagerDep['ID'];
			}
			else
			{
				// - if user has no department, but somehow have manager - then he is assumed to be in manager's department
				// - if user has same department name as manager - then he is not head
				// here we can return manager's department id immediately
				$arResult = $arManagerDep;
				$arResult['IS_HEAD'] = false;
				return $arResult;
			}
		}
		else
		{
			// if there's no manager's data
			if ($department && trim($department)!='')
				$parentSectionId = $this->arFields['ROOT_DEPARTMENT'];
			else
			{
				// if have no manager's department and no own department:
				// - use default as our department and root as parent section if default is set
				// - or just root if default has empty value
				// - or return false, if setting of default department is turned off
				if ($this->arFields['STRUCT_HAVE_DEFAULT'] && $this->arFields['STRUCT_HAVE_DEFAULT'] == "Y")
				{
					// if can use default department
					$department = $this->arFields['DEFAULT_DEPARTMENT_NAME'];
					if ($department && trim($department)!='')
					{
						// if department is not empty
						$parentSectionId = $this->arFields['ROOT_DEPARTMENT'];
					}
					else
					{
						// if it is empty - return parent
						return array('ID' => $this->arFields['ROOT_DEPARTMENT']);
					}
				}
				else
				{
					// if have no department in AD and no default - then do not set a department
					return false;
				}
			}
		}
		// 3. if there's no department set for this user, this means there was no default department name (which substituted in *) - then there's no need to set department id for this user at all
		if (!$department || trim($department)=='')
			return false;

		// 4. detect this user's department ID, using parent id and department name string, which we certainly have now (these 2 parameters are required to get an ID)

		// see if this department already exists
		$bs = new CIBlockSection();
		$dbExistingSections = GetIBlockSectionList(
			$iblockId,
			($parentSectionId >= 0 ? $parentSectionId : false),
			$arOrder = Array("left_margin" => "asc"),
			$cnt = 0,
			$arFilter = Array('NAME' => $department)
		);

		$departmentId = false;
		if($arItem = $dbExistingSections->GetNext())
			$departmentId = $arItem['ID'];
		if (!$departmentId)
		{
			//create new department
			$arNewSectFields = Array(
				"ACTIVE" => "Y",
				"IBLOCK_ID" => $iblockId,
				"NAME" => $department
			);
			if ($parentSectionId>=0)
				$arNewSectFields["IBLOCK_SECTION_ID"] = $parentSectionId;
			// and get it's Id
			$departmentId = $bs->Add($arNewSectFields);
		}

		$arElement = $GLOBALS["USER_FIELD_MANAGER"]->GetUserFields(
			'IBLOCK_'.$iblockId.'_SECTION',
			$departmentId
		);

		// if the head of the department is already set, do not change it
		if (!empty($arElement['UF_HEAD']['VALUE']))
			$arResult['IS_HEAD'] = false;

		$arResult['ID'] = $departmentId;
		return $arResult;
	}