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	diff --git a/src/Telegram.php b/src/Telegram.php
	index 4b2425f..18cf119 100644
	--- a/src/Telegram.php
	+++ b/src/Telegram.php
	@@ -1,1325 +1,1325 @@
	<?php

	/**
	* This file is part of the TelegramBot package.
	*
	* (c) Avtandil Kikabidze aka LONGMAN <akalongman@gmail.com>
	*
	* For the full copyright and license information, please view the LICENSE
	* file that was distributed with this source code.
	*/

	namespace Longman\TelegramBot;

	defined('TB_BASE_PATH') \|\| define('TB_BASE_PATH', __DIR__);
	defined('TB_BASE_COMMANDS_PATH') \|\| define('TB_BASE_COMMANDS_PATH', TB_BASE_PATH . '/Commands');

	use Exception;
	use InvalidArgumentException;
	use Longman\TelegramBot\Commands\AdminCommand;
	use Longman\TelegramBot\Commands\Command;
	use Longman\TelegramBot\Commands\SystemCommand;
	use Longman\TelegramBot\Commands\UserCommand;
	use Longman\TelegramBot\Entities\Chat;
	use Longman\TelegramBot\Entities\ServerResponse;
	use Longman\TelegramBot\Entities\Update;
	use Longman\TelegramBot\Entities\User;
	use Longman\TelegramBot\Exception\TelegramException;
	use PDO;
	use RecursiveDirectoryIterator;
	use RecursiveIteratorIterator;
	use RegexIterator;

	class Telegram
	{
	/**
	* Version
	*
	* @var string
	*/
	protected $version = '0.83.0';

	/**
	* Telegram API key
	*
	* @var string
	*/
	protected $api_key = '';

	/**
	* Telegram Bot username
	*
	* @var string
	*/
	protected $bot_username = '';

	/**
	* Telegram Bot id
	*
	* @var int
	*/
	protected $bot_id = 0;

	/**
	* Raw request data (json) for webhook methods
	*
	* @var string
	*/
	protected $input = '';

	/**
	* Secret token to authorise webhook requests
	*
	* @var string
	*/
	protected $secret_token = '';

	/**
	* Custom commands paths
	*
	* @var array
	*/
	protected $commands_paths = [];

	/**
	* Custom command class names
	* ```
	* [
	* 'User' => [
	* // command_name => command_class
	* 'start' => 'name\space\to\StartCommand',
	* ],
	* 'Admin' => [], //etc
	* ]
	* ```
	*
	* @var array
	*/
	protected $command_classes = [
	Command::AUTH_USER => [],
	Command::AUTH_ADMIN => [],
	Command::AUTH_SYSTEM => [],
	];

	/**
	* Custom commands objects
	*
	* @var array
	*/
	protected $commands_objects = [];

	/**
	* Current Update object
	*
	* @var Update
	*/
	protected $update;

	/**
	* Upload path
	*
	* @var string
	*/
	protected $upload_path = '';

	/**
	* Download path
	*
	* @var string
	*/
	protected $download_path = '';

	/**
	* MySQL integration
	*
	* @var bool
	*/
	protected $mysql_enabled = false;

	/**
	* PDO object
	*
	* @var PDO
	*/
	protected $pdo;

	/**
	* Commands config
	*
	* @var array
	*/
	protected $commands_config = [];

	/**
	* Admins list
	*
	* @var array
	*/
	protected $admins_list = [];

	/**
	* ServerResponse of the last Command execution
	*
	* @var ServerResponse
	*/
	protected $last_command_response;

	/**
	* Check if runCommands() is running in this session
	*
	* @var bool
	*/
	protected $run_commands = false;

	/**
	* Is running getUpdates without DB enabled
	*
	* @var bool
	*/
	protected $getupdates_without_database = false;

	/**
	* Last update ID
	* Only used when running getUpdates without a database
	*
	* @var int
	*/
	protected $last_update_id;

	/**
	* The command to be executed when there's a new message update and nothing more suitable is found
	*/
	public const GENERIC_MESSAGE_COMMAND = 'genericmessage';

	/**
	* The command to be executed by default (when no other relevant commands are applicable)
	*/
	public const GENERIC_COMMAND = 'generic';

	/**
	* Update filter method
	*
	* @var callable
	*/
	protected $update_filter;

	/**
	* Telegram constructor.
	*
	* @param string $api_key
	* @param string $bot_username
	*
	* @throws TelegramException
	*/
	public function __construct(string $api_key, string $bot_username = '')
	{
	if (empty($api_key)) {
	throw new TelegramException('API KEY not defined!');
	}
	preg_match('/(\d+):[\w\-]+/', $api_key, $matches);
	if (!isset($matches[1])) {
	throw new TelegramException('Invalid API KEY defined!');
	}
	$this->bot_id = (int) $matches[1];
	$this->api_key = $api_key;

	$this->bot_username = $bot_username;

	//Add default system commands path
	$this->addCommandsPath(TB_BASE_COMMANDS_PATH . '/SystemCommands');

	Request::initialize($this);
	}

	/**
	* Initialize Database connection
	*
	* @param array $credentials
	* @param string $table_prefix
	* @param string $encoding
	*
	* @return Telegram
	* @throws TelegramException
	*/
	public function enableMySql(array $credentials, string $table_prefix = '', string $encoding = 'utf8mb4'): Telegram
	{
	$this->pdo = DB::initialize($credentials, $this, $table_prefix, $encoding);
	ConversationDB::initializeConversation();
	$this->mysql_enabled = true;

	return $this;
	}

	/**
	* Initialize Database external connection
	*
	* @param PDO $external_pdo_connection PDO database object
	* @param string $table_prefix
	*
	* @return Telegram
	* @throws TelegramException
	*/
	public function enableExternalMySql(PDO $external_pdo_connection, string $table_prefix = ''): Telegram
	{
	$this->pdo = DB::externalInitialize($external_pdo_connection, $this, $table_prefix);
	ConversationDB::initializeConversation();
	$this->mysql_enabled = true;

	return $this;
	}

	/**
	* Get commands list
	*
	* @return array $commands
	* @throws TelegramException
	*/
	public function getCommandsList(): array
	{
	$commands = [];

	foreach ($this->commands_paths as $path) {
	try {
	//Get all "*Command.php" files
	$files = new RegexIterator(
	new RecursiveIteratorIterator(
	new RecursiveDirectoryIterator($path)
	),
	'/^.+Command.php$/'
	);

	foreach ($files as $file) {
	// Convert filename to command
	$command = $this->classNameToCommandName(substr($file->getFilename(), 0, -4));

	// Invalid Classname
	if (is_null($command)) {
	continue;
	}

	// Already registered
	if (array_key_exists($command, $commands)) {
	continue;
	}

	require_once $file->getPathname();

	$command_obj = $this->getCommandObject($command, $file->getPathname());
	if ($command_obj instanceof Command) {
	$commands[$command] = $command_obj;
	}
	}
	} catch (Exception $e) {
	throw new TelegramException('Error getting commands from path: ' . $path, 0, $e);
	}
	}

	return $commands;
	}

	/**
	* Get classname of predefined commands
	*
	* @see command_classes
	*
	* @param string $auth Auth of command
	* @param string $command Command name
	* @param string $filepath Path to the command file
	*
	* @return string\|null
	*/
	public function getCommandClassName(string $auth, string $command, string $filepath = ''): ?string
	{
	$command = mb_strtolower($command);

	// Invalid command
	if (trim($command) === '') {
	return null;
	}

	$auth = $this->ucFirstUnicode($auth);

	// First, check for directly assigned command class.
	if ($command_class = $this->command_classes[$auth][$command] ?? null) {
	return $command_class;
	}

	// Start with default namespace.
	$command_namespace = __NAMESPACE__ . '\\Commands\\' . $auth . 'Commands';

	// Check if we can get the namespace from the file (if passed).
	if ($filepath && !($command_namespace = $this->getFileNamespace($filepath))) {
	return null;
	}

	$command_class = $command_namespace . '\\' . $this->commandNameToClassName($command);

	if (class_exists($command_class)) {
	return $command_class;
	}

	return null;
	}

	/**
	* Get an object instance of the passed command
	*
	* @param string $command
	* @param string $filepath
	*
	* @return Command\|null
	*/
	public function getCommandObject(string $command, string $filepath = ''): ?Command
	{
	if (isset($this->commands_objects[$command])) {
	return $this->commands_objects[$command];
	}

	$which = [Command::AUTH_SYSTEM];
	$this->isAdmin() && $which[] = Command::AUTH_ADMIN;
	$which[] = Command::AUTH_USER;

	foreach ($which as $auth) {
	$command_class = $this->getCommandClassName($auth, $command, $filepath);

	if ($command_class) {
	$command_obj = new $command_class($this, $this->update);

	if ($auth === Command::AUTH_SYSTEM && $command_obj instanceof SystemCommand) {
	return $command_obj;
	}
	if ($auth === Command::AUTH_ADMIN && $command_obj instanceof AdminCommand) {
	return $command_obj;
	}
	if ($auth === Command::AUTH_USER && $command_obj instanceof UserCommand) {
	return $command_obj;
	}
	}
	}

	return null;
	}

	/**
	* Get namespace from php file by src path
	*
	* @param string $src (absolute path to file)
	*
	* @return string\|null ("Longman\TelegramBot\Commands\SystemCommands" for example)
	*/
	protected function getFileNamespace(string $src): ?string
	{
	$content = file_get_contents($src);
	if (preg_match('#^\s*namespace\s+(.+?);#m', $content, $m)) {
	return $m[1];
	}

	return null;
	}

	/**
	* Set custom input string for debug purposes
	*
	* @param string $input (json format)
	*
	* @return Telegram
	*/
	public function setCustomInput(string $input): Telegram
	{
	$this->input = $input;

	return $this;
	}

	/**
	* Get custom input string for debug purposes
	*
	* @return string
	*/
	public function getCustomInput(): string
	{
	return $this->input;
	}

	/**
	* Get the ServerResponse of the last Command execution
	*
	* @return ServerResponse
	*/
	public function getLastCommandResponse(): ServerResponse
	{
	return $this->last_command_response;
	}
	/**
	* Handle getUpdates method
	*
	* @param array $data
	*
	* @return ServerResponse
	* @throws TelegramException
	*/
	public function handleGetUpdates(array $data = []): ServerResponse
	{
	if (empty($this->bot_username)) {
	throw new TelegramException('Bot Username is not defined!');
	}

	if (!DB::isDbConnected() && !$this->getupdates_without_database) {
	return new ServerResponse(
	[
	'ok' => false,
	'description' => 'getUpdates needs MySQL connection! (This can be overridden - see documentation)',
	],
	$this->bot_username
	);
	}

	$offset = $data['offset'] ?? 0;
	$limit = $data['limit'] ?? null;
	$timeout = $data['timeout'] ?? null;
	$allowed_updates = $data['allowed_updates'] ?? [];

	// Take custom input into account.
	if ($custom_input = $this->getCustomInput()) {
	try {
	$input = json_decode($this->input, true, 512, JSON_THROW_ON_ERROR);
	if (empty($input)) {
	throw new TelegramException('Custom input is empty');
	}
	$response = new ServerResponse($input, $this->bot_username);
	} catch (\Throwable $e) {
	throw new TelegramException('Invalid custom input JSON: ' . $e->getMessage());
	}
	} else {
	if (DB::isDbConnected() && $last_update = DB::selectTelegramUpdate(1)) {
	// Get last Update id from the database.
	$last_update = reset($last_update);
	$this->last_update_id = $last_update['id'] ?? null;
	}

	if ($this->last_update_id !== null) {
	$offset = $this->last_update_id + 1; // As explained in the telegram bot API documentation.
	}

	$response = Request::getUpdates(compact('offset', 'limit', 'timeout', 'allowed_updates'));
	}

	if ($response->isOk()) {
	// Log update.
	TelegramLog::update($response->toJson());

	// Process all updates
	/** @var Update $update */
	foreach ($response->getResult() as $update) {
	$this->processUpdate($update);
	}

	if (!DB::isDbConnected() && !$custom_input && $this->last_update_id !== null && $offset === 0) {
	// Mark update(s) as read after handling
	$offset = $this->last_update_id + 1;
	$limit = 1;

	Request::getUpdates(compact('offset', 'limit', 'timeout', 'allowed_updates'));
	}

	}

	return $response;
	}

	/**
	* Handle bot request from webhook
	*
	* @return bool
	*
	* @throws TelegramException
	*/
	public function handle(): bool
	{
	if ($this->bot_username === '') {
	throw new TelegramException('Bot Username is not defined!');
	}

	if ($this->secret_token !== '' && $this->secret_token !== Request::getSecretTokenHeader()) {
	throw new TelegramException('Secret token is invalid!');
	}

	$input = Request::getInput();
	if (empty($input)) {
	throw new TelegramException('Input is empty! The webhook must not be called manually, only by Telegram.');
	}

	// Log update.
	TelegramLog::update($input);

	$post = json_decode($input, true);
	if (empty($post)) {
	throw new TelegramException('Invalid input JSON! The webhook must not be called manually, only by Telegram.');
	}

	if ($response = $this->processUpdate(new Update($post, $this->bot_username))) {
	return $response->isOk();
	}

	return false;
	}

	/**
	* Get the command name from the command type
	*
	* @param string $type
	*
	* @return string
	*/
	protected function getCommandFromType(string $type): string
	{
	return $this->ucFirstUnicode(str_replace('_', '', $type));
	}

	/**
	* Process bot Update request
	*
	* @param Update $update
	*
	* @return ServerResponse
	* @throws TelegramException
	*/
	public function processUpdate(Update $update): ServerResponse
	{
	$this->update = $update;
	$this->last_update_id = $update->getUpdateId();

	if (is_callable($this->update_filter)) {
	$reason = 'Update denied by update_filter';
	try {
	$allowed = (bool) call_user_func_array($this->update_filter, [$update, $this, &$reason]);
	} catch (Exception $e) {
	$allowed = false;
	}

	if (!$allowed) {
	TelegramLog::debug($reason);
	return new ServerResponse(['ok' => false, 'description' => 'denied']);
	}
	}

	//Load admin commands
	if ($this->isAdmin()) {
	$this->addCommandsPath(TB_BASE_COMMANDS_PATH . '/AdminCommands', false);
	}

	//Make sure we have an up-to-date command list
	//This is necessary to "require" all the necessary command files!
	$this->commands_objects = $this->getCommandsList();

	//If all else fails, it's a generic message.
	$command = self::GENERIC_MESSAGE_COMMAND;

	$update_type = $this->update->getUpdateType();
	if ($update_type === 'message') {
	$message = $this->update->getMessage();
	$type = $message->getType();

	// Let's check if the message object has the type field we're looking for...
	$command_tmp = $type === 'command' ? $message->getCommand() : $this->getCommandFromType($type);
	// ...and if a fitting command class is available.
	$command_obj = $command_tmp ? $this->getCommandObject($command_tmp) : null;

	- if (($command_obj === null && $type === 'command') \|\| ($command_obj instanceof SystemCommand)) {
	+ if (($type === 'command') \|\| ($command_obj instanceof SystemCommand)) {
	$command = $command_tmp;
	}
	} elseif ($update_type !== null) {
	$command = $this->getCommandFromType($update_type);
	}

	//Make sure we don't try to process update that was already processed
	$last_id = DB::selectTelegramUpdate(1, $this->update->getUpdateId());
	if ($last_id && count($last_id) === 1) {
	TelegramLog::debug('Duplicate update received, processing aborted!');
	return Request::emptyResponse();
	}

	DB::insertRequest($this->update);

	return $this->executeCommand($command);
	}

	/**
	* Execute /command
	*
	* @param string $command
	*
	* @return ServerResponse
	* @throws TelegramException
	*/
	public function executeCommand(string $command): ServerResponse
	{
	$command = mb_strtolower($command);

	$command_obj = $this->commands_objects[$command] ?? $this->getCommandObject($command);

	if (!$command_obj \|\| !$command_obj->isEnabled()) {
	//Failsafe in case the Generic command can't be found
	if ($command === self::GENERIC_COMMAND) {
	throw new TelegramException('Generic command missing!');
	}

	//Handle a generic command or non existing one
	$this->last_command_response = $this->executeCommand(self::GENERIC_COMMAND);
	} else {
	//execute() method is executed after preExecute()
	//This is to prevent executing a DB query without a valid connection
	if ($this->update) {
	$this->last_command_response = $command_obj->setUpdate($this->update)->preExecute();
	} else {
	$this->last_command_response = $command_obj->preExecute();
	}
	}

	return $this->last_command_response;
	}

	/**
	* Enable a single Admin account
	*
	* @param int $admin_id Single admin id
	*
	* @return Telegram
	*/
	public function enableAdmin(int $admin_id): Telegram
	{
	if ($admin_id <= 0) {
	TelegramLog::error('Invalid value "' . $admin_id . '" for admin.');
	} elseif (!in_array($admin_id, $this->admins_list, true)) {
	$this->admins_list[] = $admin_id;
	}

	return $this;
	}

	/**
	* Enable a list of Admin Accounts
	*
	* @param array $admin_ids List of admin ids
	*
	* @return Telegram
	*/
	public function enableAdmins(array $admin_ids): Telegram
	{
	foreach ($admin_ids as $admin_id) {
	$this->enableAdmin($admin_id);
	}

	return $this;
	}

	/**
	* Get list of admins
	*
	* @return array
	*/
	public function getAdminList(): array
	{
	return $this->admins_list;
	}

	/**
	* Check if the passed user is an admin
	*
	* If no user id is passed, the current update is checked for a valid message sender.
	*
	* @param int\|null $user_id
	*
	* @return bool
	*/
	public function isAdmin($user_id = null): bool
	{
	if ($user_id === null && $this->update !== null) {
	//Try to figure out if the user is an admin
	$update_methods = [
	'getMessage',
	'getEditedMessage',
	'getChannelPost',
	'getEditedChannelPost',
	'getInlineQuery',
	'getChosenInlineResult',
	'getCallbackQuery',
	];
	foreach ($update_methods as $update_method) {
	$object = call_user_func([$this->update, $update_method]);
	if ($object !== null && $from = $object->getFrom()) {
	$user_id = $from->getId();
	break;
	}
	}
	}

	return ($user_id === null) ? false : in_array($user_id, $this->admins_list, true);
	}

	/**
	* Check if user required the db connection
	*
	* @return bool
	*/
	public function isDbEnabled(): bool
	{
	return $this->mysql_enabled;
	}

	/**
	* Add a single custom command class
	*
	* @param string $command_class Full command class name
	*
	* @return Telegram
	*/
	public function addCommandClass(string $command_class): Telegram
	{
	if (!$command_class \|\| !class_exists($command_class)) {
	$error = sprintf('Command class "%s" does not exist.', $command_class);
	TelegramLog::error($error);
	throw new InvalidArgumentException($error);
	}

	if (!is_a($command_class, Command::class, true)) {
	$error = sprintf('Command class "%s" does not extend "%s".', $command_class, Command::class);
	TelegramLog::error($error);
	throw new InvalidArgumentException($error);
	}

	// Dummy object to get data from.
	$command_object = new $command_class($this);

	$auth = null;
	$command_object->isSystemCommand() && $auth = Command::AUTH_SYSTEM;
	$command_object->isAdminCommand() && $auth = Command::AUTH_ADMIN;
	$command_object->isUserCommand() && $auth = Command::AUTH_USER;

	if ($auth) {
	$command = mb_strtolower($command_object->getName());

	$this->command_classes[$auth][$command] = $command_class;
	}

	return $this;
	}

	/**
	* Add multiple custom command classes
	*
	* @param array $command_classes List of full command class names
	*
	* @return Telegram
	*/
	public function addCommandClasses(array $command_classes): Telegram
	{
	foreach ($command_classes as $command_class) {
	$this->addCommandClass($command_class);
	}

	return $this;
	}

	/**
	* Set a single custom commands path
	*
	* @param string $path Custom commands path to set
	*
	* @return Telegram
	*/
	public function setCommandsPath(string $path): Telegram
	{
	$this->commands_paths = [];

	$this->addCommandsPath($path);

	return $this;
	}

	/**
	* Add a single custom commands path
	*
	* @param string $path Custom commands path to add
	* @param bool $before If the path should be prepended or appended to the list
	*
	* @return Telegram
	*/
	public function addCommandsPath(string $path, bool $before = true): Telegram
	{
	if (!is_dir($path)) {
	TelegramLog::error('Commands path "' . $path . '" does not exist.');
	} elseif (!in_array($path, $this->commands_paths, true)) {
	if ($before) {
	array_unshift($this->commands_paths, $path);
	} else {
	$this->commands_paths[] = $path;
	}
	}

	return $this;
	}

	/**
	* Set multiple custom commands paths
	*
	* @param array $paths Custom commands paths to add
	*
	* @return Telegram
	*/
	public function setCommandsPaths(array $paths): Telegram
	{
	$this->commands_paths = [];

	$this->addCommandsPaths($paths);

	return $this;
	}

	/**
	* Add multiple custom commands paths
	*
	* @param array $paths Custom commands paths to add
	* @param bool $before If the paths should be prepended or appended to the list
	*
	* @return Telegram
	*/
	public function addCommandsPaths(array $paths, bool $before = true): Telegram
	{
	foreach ($paths as $path) {
	$this->addCommandsPath($path, $before);
	}

	return $this;
	}

	/**
	* Return the list of commands paths
	*
	* @return array
	*/
	public function getCommandsPaths(): array
	{
	return $this->commands_paths;
	}

	/**
	* Return the list of command classes
	*
	* @return array
	*/
	public function getCommandClasses(): array
	{
	return $this->command_classes;
	}

	/**
	* Set custom upload path
	*
	* @param string $path Custom upload path
	*
	* @return Telegram
	*/
	public function setUploadPath(string $path): Telegram
	{
	$this->upload_path = $path;

	return $this;
	}

	/**
	* Get custom upload path
	*
	* @return string
	*/
	public function getUploadPath(): string
	{
	return $this->upload_path;
	}

	/**
	* Set custom download path
	*
	* @param string $path Custom download path
	*
	* @return Telegram
	*/
	public function setDownloadPath(string $path): Telegram
	{
	$this->download_path = $path;

	return $this;
	}

	/**
	* Get custom download path
	*
	* @return string
	*/
	public function getDownloadPath(): string
	{
	return $this->download_path;
	}

	/**
	* Set command config
	*
	* Provide further variables to a particular commands.
	* For example you can add the channel name at the command /sendtochannel
	* Or you can add the api key for external service.
	*
	* @param string $command
	* @param array $config
	*
	* @return Telegram
	*/
	public function setCommandConfig(string $command, array $config): Telegram
	{
	$this->commands_config[$command] = $config;

	return $this;
	}

	/**
	* Get command config
	*
	* @param string $command
	*
	* @return array
	*/
	public function getCommandConfig(string $command): array
	{
	return $this->commands_config[$command] ?? [];
	}

	/**
	* Get API key
	*
	* @return string
	*/
	public function getApiKey(): string
	{
	return $this->api_key;
	}

	/**
	* Get Bot name
	*
	* @return string
	*/
	public function getBotUsername(): string
	{
	return $this->bot_username;
	}

	/**
	* Get Bot Id
	*
	* @return int
	*/
	public function getBotId(): int
	{
	return $this->bot_id;
	}

	/**
	* Get Version
	*
	* @return string
	*/
	public function getVersion(): string
	{
	return $this->version;
	}

	/**
	* Set Webhook for bot
	*
	* @param string $url
	* @param array $data Optional parameters.
	*
	* @return ServerResponse
	* @throws TelegramException
	*/
	public function setWebhook(string $url, array $data = []): ServerResponse
	{
	if ($url === '') {
	throw new TelegramException('Hook url is empty!');
	}

	$data = array_intersect_key($data, array_flip([
	'certificate',
	'ip_address',
	'max_connections',
	'allowed_updates',
	'drop_pending_updates',
	'secret_token',
	]));
	$data['url'] = $url;

	// If the certificate is passed as a path, encode and add the file to the data array.
	if (!empty($data['certificate']) && is_string($data['certificate'])) {
	$data['certificate'] = Request::encodeFile($data['certificate']);
	}

	$result = Request::setWebhook($data);

	if (!$result->isOk()) {
	throw new TelegramException(
	'Webhook was not set! Error: ' . $result->getErrorCode() . ' ' . $result->getDescription()
	);
	}

	return $result;
	}

	/**
	* Delete any assigned webhook
	*
	* @param array $data
	*
	* @return ServerResponse
	* @throws TelegramException
	*/
	public function deleteWebhook(array $data = []): ServerResponse
	{
	$result = Request::deleteWebhook($data);

	if (!$result->isOk()) {
	throw new TelegramException(
	'Webhook was not deleted! Error: ' . $result->getErrorCode() . ' ' . $result->getDescription()
	);
	}

	return $result;
	}

	/**
	* Replace function `ucwords` for UTF-8 characters in the class definition and commands
	*
	* @param string $str
	* @param string $encoding (default = 'UTF-8')
	*
	* @return string
	*/
	protected function ucWordsUnicode(string $str, string $encoding = 'UTF-8'): string
	{
	return mb_convert_case($str, MB_CASE_TITLE, $encoding);
	}

	/**
	* Replace function `ucfirst` for UTF-8 characters in the class definition and commands
	*
	* @param string $str
	* @param string $encoding (default = 'UTF-8')
	*
	* @return string
	*/
	protected function ucFirstUnicode(string $str, string $encoding = 'UTF-8'): string
	{
	return mb_strtoupper(mb_substr($str, 0, 1, $encoding), $encoding)
	. mb_strtolower(mb_substr($str, 1, mb_strlen($str), $encoding), $encoding);
	}

	/**
	* Enable requests limiter
	*
	* @param array $options
	*
	* @return Telegram
	* @throws TelegramException
	*/
	public function enableLimiter(array $options = []): Telegram
	{
	Request::setLimiter(true, $options);

	return $this;
	}

	/**
	* Run provided commands
	*
	* @param array $commands
	*
	* @return ServerResponse[]
	*
	* @throws TelegramException
	*/
	public function runCommands(array $commands): array
	{
	if (empty($commands)) {
	throw new TelegramException('No command(s) provided!');
	}

	$this->run_commands = true;

	// Check if this request has a user Update / comes from Telegram.
	if ($userUpdate = $this->update) {
	$from = $this->update->getMessage()->getFrom();
	$chat = $this->update->getMessage()->getChat();
	} else {
	// Fall back to the Bot user.
	$from = new User([
	'id' => $this->getBotId(),
	'first_name' => $this->getBotUsername(),
	'username' => $this->getBotUsername(),
	]);

	// Try to get "live" Bot info.
	$response = Request::getMe();
	if ($response->isOk()) {
	/** @var User $result */
	$result = $response->getResult();

	$from = new User([
	'id' => $result->getId(),
	'first_name' => $result->getFirstName(),
	'username' => $result->getUsername(),
	]);
	}

	// Give Bot access to admin commands.
	$this->enableAdmin($from->getId());

	// Lock the bot to a private chat context.
	$chat = new Chat([
	'id' => $from->getId(),
	'type' => 'private',
	]);
	}

	$newUpdate = static function ($text = '') use ($from, $chat) {
	return new Update([
	'update_id' => -1,
	'message' => [
	'message_id' => -1,
	'date' => time(),
	'from' => json_decode($from->toJson(), true),
	'chat' => json_decode($chat->toJson(), true),
	'text' => $text,
	],
	]);
	};

	$responses = [];

	foreach ($commands as $command) {
	$this->update = $newUpdate($command);

	// Refresh commands list for new Update object.
	$this->commands_objects = $this->getCommandsList();

	$responses[] = $this->executeCommand($this->update->getMessage()->getCommand());
	}

	// Reset Update to initial context.
	$this->update = $userUpdate;

	return $responses;
	}

	/**
	* Is this session initiated by runCommands()
	*
	* @return bool
	*/
	public function isRunCommands(): bool
	{
	return $this->run_commands;
	}

	/**
	* Switch to enable running getUpdates without a database
	*
	* @param bool $enable
	*
	* @return Telegram
	*/
	public function useGetUpdatesWithoutDatabase(bool $enable = true): Telegram
	{
	$this->getupdates_without_database = $enable;

	return $this;
	}

	/**
	* Return last update id
	*
	* @return int\|null
	*/
	public function getLastUpdateId(): ?int
	{
	return $this->last_update_id;
	}

	/**
	* Set an update filter callback
	*
	* @param callable $callback
	*
	* @return Telegram
	*/
	public function setUpdateFilter(callable $callback): Telegram
	{
	$this->update_filter = $callback;

	return $this;
	}

	/**
	* Return update filter callback
	*
	* @return callable\|null
	*/
	public function getUpdateFilter(): ?callable
	{
	return $this->update_filter;
	}

	/**
	* Set the secret token to be used for webhook verification
	*
	* @param string $secret_token
	*
	* @return Telegram
	*/
	public function setSecretToken(string $secret_token): Telegram
	{
	$this->secret_token = $secret_token;

	return $this;
	}

	/**
	* Converts the name of a class into the name of a command.
	*
	* @param string $class For example FooBarCommand
	*
	* @return string\|null for example foo_bar. In case of errors, returns null.
	*/
	protected function classNameToCommandName(string $class): ?string
	{
	// If $class doesn't end with 'Command'
	if (substr($class, -7) !== 'Command') {
	return null;
	}

	return mb_strtolower(preg_replace('/(.)(?=[\p{Lu}])/u', '$1_', substr($class, 0, -7)));
	}

	/**
	* Converts a command name into the name of a class.
	*
	* @param string $command For example foo_bar
	*
	* @return string\|null for example FooBarCommand. In case of errors, returns null.
	*/
	protected function commandNameToClassName(string $command): ?string
	{
	if (trim($command) === '') {
	return null;
	}

	return str_replace(' ', '', $this->ucWordsUnicode(str_replace('_', ' ', $command))) . 'Command';
	}
	}

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