Chat::onEntityModification

static function onEntityModification($entityTypeID, $entityID, array $params)
{
	if (!Main\Loader::includeModule('im'))
	{
		return;
	}

	$chatID = self::getChatId($entityTypeID, $entityID);
	if($chatID <= 0)
	{
		return;
	}

	$currentFields = isset($params['CURRENT_FIELDS']) && is_array($params['CURRENT_FIELDS'])
		? $params['CURRENT_FIELDS'] : [];
	$previousFields = isset($params['PREVIOUS_FIELDS']) && is_array($params['PREVIOUS_FIELDS'])
		? $params['PREVIOUS_FIELDS'] : [];
	$removedObserverIDs = isset($params['REMOVED_OBSERVER_IDS']) && is_array($params['REMOVED_OBSERVER_IDS'])
		? $params['REMOVED_OBSERVER_IDS'] : [];

	$currentOwnerID = 0;
	$currentTitle = '';

	if (static::isEntitySupported((int)$entityTypeID))
	{
		$previousResponsibleID = $previousFields['ASSIGNED_BY_ID'] ?? 0;
		if(isset($currentFields['ASSIGNED_BY_ID']) && $currentFields['ASSIGNED_BY_ID'] != $previousResponsibleID)
		{
			$currentOwnerID = (int)$currentFields['ASSIGNED_BY_ID'];
		}

		$previousTitle = $previousFields['TITLE'] ?? '';
		if(isset($currentFields['TITLE']) && $currentFields['TITLE'] != $previousTitle)
		{
			$currentTitle = $currentFields['TITLE'];
		}
	}

	if($currentOwnerID > 0 || $currentTitle !== '' || !empty($removedObserverIDs))
	{
		$chat = new \CIMChat(0);
		if($currentOwnerID > 0)
		{
			$chat->AddUser($chatID, [ $currentOwnerID ], false, false);
			$chat->SetOwner($chatID, $currentOwnerID, false);
		}

		if($currentTitle !== '')
		{
			$currentTitle = self::buildChatName(
				[
					'ENTITY_TYPE' => \CCrmOwnerType::ResolveName($entityTypeID),
					'ENTITY_TITLE' => $currentTitle,
				]
			);
			$chat->Rename($chatID, $currentTitle, false, false);
		}

		foreach($removedObserverIDs as $removedObserverID)
		{
			$chat->DeleteUser($chatID, $removedObserverID, false, false);
		}
	}
}