DB.php
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DB.php
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	<?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.
	* Written by Marco Boretto <marco.bore@gmail.com>
	*/

	namespace Longman\TelegramBot;

	use Longman\TelegramBot\Entities\Chat;
	use Longman\TelegramBot\Entities\InlineQuery;
	use Longman\TelegramBot\Entities\Message;
	use Longman\TelegramBot\Entities\Update;
	use Longman\TelegramBot\Entities\User;
	use Longman\TelegramBot\Exception\TelegramException;

	/**
	* @package Telegram
	* @author Avtandil Kikabidze <akalongman@gmail.com>
	* @copyright Avtandil Kikabidze <akalongman@gmail.com>
	* @license http://opensource.org/licenses/mit-license.php The MIT License (MIT)
	* @link http://www.github.com/akalongman/php-telegram-bot
	*/

	/**
	* Class DB.
	*/
	class DB
	{
	/**
	* MySQL credentials
	*
	* @var array
	*/
	static protected $mysql_credentials = [];

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

	/**
	* Table prefix
	*
	* @var string
	*/
	static protected $table_prefix;

	/**
	* Telegram class object
	*
	* @var Telegram
	*/
	static protected $telegram;

	/**
	* Initialize
	*
	* @param array $credentials Database connection details
	* @param Telegram $telegram Telegram object to connect with this object
	* @param string $table_prefix Table prefix
	*
	* @return PDO PDO database object
	*/
	public static function initialize(array $credentials, Telegram $telegram, $table_prefix = null)
	{
	if (empty($credentials)) {
	throw new TelegramException('MySQL credentials not provided!');
	}

	$dsn = 'mysql:host=' . $credentials['host'] . ';dbname=' . $credentials['database'];
	$options = [\PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'];
	try {
	$pdo = new \PDO($dsn, $credentials['user'], $credentials['password'], $options);
	$pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_WARNING);
	} catch (\PDOException $e) {
	throw new TelegramException($e->getMessage());
	}

	self::$pdo = $pdo;
	self::$telegram = $telegram;
	self::$mysql_credentials = $credentials;
	self::$table_prefix = $table_prefix;

	self::defineTable();

	return self::$pdo;
	}

	/**
	* External Initialize
	*
	* Let you use the class with an external already existing Pdo Mysql connection.
	*
	* @param PDO $external_pdo_connection PDO database object
	* @param Telegram $telegram Telegram object to connect with this object
	* @param string $table_prefix Table prefix
	*
	* @return PDO PDO database object
	*/
	public static function externalInitialize($external_pdo_connection, Telegram $telegram, $table_prefix = null)
	{
	if (empty($external_pdo_connection)) {
	throw new TelegramException('MySQL external connection not provided!');
	}

	self::$pdo = $external_pdo_connection;
	self::$telegram = $telegram;
	self::$mysql_credentials = null;
	self::$table_prefix = $table_prefix;

	self::defineTable();

	return self::$pdo;
	}

	/**
	* Define all the table with the proper prefix
	*/
	protected static function defineTable()
	{
	if (!defined('TB_TELEGRAM_UPDATE')) {
	define('TB_TELEGRAM_UPDATE', self::$table_prefix.'telegram_update');
	}
	if (!defined('TB_MESSAGE')) {
	define('TB_MESSAGE', self::$table_prefix.'message');
	}
	if (!defined('TB_INLINE_QUERY')) {
	define('TB_INLINE_QUERY', self::$table_prefix.'inline_query');
	}

	if (!defined('TB_CHOSEN_INLINE_QUERY')) {
	define('TB_CHOSEN_INLINE_QUERY', self::$table_prefix.'chosen_inline_query');
	}
	if (!defined('TB_USER')) {
	define('TB_USER', self::$table_prefix.'user');
	}
	if (!defined('TB_CHAT')) {
	define('TB_CHAT', self::$table_prefix.'chat');
	}
	if (!defined('TB_USER_CHAT')) {
	define('TB_USER_CHAT', self::$table_prefix.'user_chat');
	}
	}

	/**
	* Check if database connection has been created
	*
	* @return bool
	*/
	public static function isDbConnected()
	{
	if (empty(self::$pdo)) {
	return false;
	} else {
	return true;
	}
	}

	/**
	* Fetch update(s) from DB
	*
	* @param int $limit Limit the number of updates to fetch
	*
	* @return array\|bool Fetched data or false if not connected
	*/
	public static function selectTelegramUpdate($limit = null)
	{
	if (!self::isDbConnected()) {
	return false;
	}

	try {
	$query = 'SELECT `id` FROM `' . TB_TELEGRAM_UPDATE . '` ';
	$query .= 'ORDER BY `id` DESC';

	if (!is_null($limit)) {
	$query .= ' LIMIT :limit ';
	}

	$sth_select_telegram_update = self::$pdo->prepare($query);
	$sth_select_telegram_update->bindParam(':limit', $limit, \PDO::PARAM_INT);
	$sth_select_telegram_update->execute();
	$results = $sth_select_telegram_update->fetchAll(\PDO::FETCH_ASSOC);

	} catch (PDOException $e) {
	throw new TelegramException($e->getMessage());
	}

	return $results;
	}

	/**
	* Fetch message(s) from DB
	*
	* @param int $limit Limit the number of messages to fetch
	*
	* @return array\|bool Fetched data or false if not connected
	*/
	public static function selectMessages($limit = null)
	{
	if (!self::isDbConnected()) {
	return false;
	}

	try {
	//message table
	$query = 'SELECT * FROM `' . TB_MESSAGE . '` ';
	$query .= 'WHERE ' . TB_MESSAGE . '.`update_id` != 0 ';
	$query .= 'ORDER BY ' . TB_MESSAGE . '.`message_id` DESC';

	if (!is_null($limit)) {
	$query .= ' LIMIT :limit ';
	}

	$sth = self::$pdo->prepare($query);
	$sth->bindParam(':limit', $limit, \PDO::PARAM_INT);
	$sth->execute();
	$results = $sth->fetchAll(\PDO::FETCH_ASSOC);

	} catch (PDOException $e) {
	throw new TelegramException($e->getMessage());
	}

	return $results;
	}

	/**
	* Convert from unix timestamp to timestamp
	*
	* @param int $time Unix timestamp
	*
	* @return null\|string Timestamp if a time has been passed, else null
	*/
	protected static function getTimestamp($time = null)
	{
	if (is_null($time)) {
	return date('Y-m-d H:i:s', time());
	}
	return date('Y-m-d H:i:s', $time);
	}

	/**
	* Insert entry to telegram_update table
	*
	* @todo Needs to return something if successful
	*
	* @param int $id
	* @param int $chat_id
	* @param int $message_id
	* @param int $inline_query_id
	* @param int $chosen_inline_query_id
	*
	* @return bool\|null
	*/
	public static function insertTelegramUpdate($id, $chat_id, $message_id, $inline_query_id, $chosen_inline_query_id)
	{
	if (is_null($message_id) && is_null($message_id) && is_null($inline_query_id) && is_null($chosen_inline_query_id)) {
	throw new TelegramException('Error both query_id and message_id are null');
	}

	if (!self::isDbConnected()) {
	return false;
	}

	try {
	//telegram_update table
	$sth_insert_telegram_update = self::$pdo->prepare('INSERT IGNORE INTO `' . TB_TELEGRAM_UPDATE . '`
	(
	`id`, `chat_id`, `message_id`, `inline_query_id`, `chosen_inline_query_id`
	)
	VALUES (
	:id, :chat_id, :message_id, :inline_query_id, :chosen_inline_query_id
	)
	');

	$sth_insert_telegram_update->bindParam(':id', $id, \PDO::PARAM_INT);
	$sth_insert_telegram_update->bindParam(':chat_id', $chat_id, \PDO::PARAM_INT);
	$sth_insert_telegram_update->bindParam(':message_id', $message_id, \PDO::PARAM_INT);
	$sth_insert_telegram_update->bindParam(':inline_query_id', $inline_query_id, \PDO::PARAM_INT);
	$sth_insert_telegram_update->bindParam(':chosen_inline_query_id', $chosen_inline_query_id, \PDO::PARAM_INT);

	$status = $sth_insert_telegram_update->execute();

	} catch (PDOException $e) {
	throw new TelegramException($e->getMessage());
	}
	}

	/**
	* Insert users and save their connection to chats
	*
	* @todo Needs to return something if successful
	*
	* @param Entities\User $user
	* @param string $date
	* @param Entities\Chat $chat
	*
	* @return bool\|null
	*/
	public static function insertUser(User $user, $date, Chat $chat = null)
	{
	if (!self::isDbConnected()) {
	return false;
	}

	$user_id = $user->getId();
	$username = $user->getUsername();
	$first_name = $user->getFirstName();
	$last_name = $user->getLastName();

	try {
	//user table
	$sth1 = self::$pdo->prepare('INSERT INTO `' . TB_USER . '`
	(
	`id`, `username`, `first_name`, `last_name`, `created_at`, `updated_at`
	)
	VALUES (
	:id, :username, :first_name, :last_name, :date, :date
	)
	ON DUPLICATE KEY UPDATE `username`=:username, `first_name`=:first_name,
	`last_name`=:last_name, `updated_at`=:date
	');

	$sth1->bindParam(':id', $user_id, \PDO::PARAM_INT);
	$sth1->bindParam(':username', $username, \PDO::PARAM_STR, 255);
	$sth1->bindParam(':first_name', $first_name, \PDO::PARAM_STR, 255);
	$sth1->bindParam(':last_name', $last_name, \PDO::PARAM_STR, 255);
	$sth1->bindParam(':date', $date, \PDO::PARAM_STR);

	$status = $sth1->execute();

	} catch (PDOException $e) {
	throw new TelegramException($e->getMessage());
	}
	//insert also the relationship to the chat
	if (!is_null($chat)) {
	$chat_id = $chat->getId();
	try {
	//user_chat table
	$sth3 = self::$pdo->prepare('INSERT IGNORE INTO `' . TB_USER_CHAT . '`
	(
	`user_id`, `chat_id`
	)
	VALUES (
	:user_id, :chat_id
	)');

	$sth3->bindParam(':user_id', $user_id, \PDO::PARAM_INT);
	$sth3->bindParam(':chat_id', $chat_id, \PDO::PARAM_INT);

	$status = $sth3->execute();

	} catch (PDOException $e) {
	throw new TelegramException($e->getMessage());
	}
	}
	}

	/**
	* Insert request into database
	*
	* @param Entities\Update &$update
	*
	* @return bool
	*/
	public static function insertRequest(Update &$update)
	{
	$update_id = $update->getUpdateId();
	if ($update->getUpdateType() == 'message') {
	$message = $update->getMessage();
	$message_id = $message->getMessageId();
	$chat_id = $message->getChat()->getId();
	self::insertMessageRequest($message);
	return self::insertTelegramUpdate($update_id, $chat_id, $message_id, null, null);
	} elseif ($update->getUpdateType() == 'inline_query') {
	$inline_query = $update->getInlineQuery();
	$inline_query_id = $inline_query->getId();
	self::insertInlineQueryRequest($inline_query);
	return self::insertTelegramUpdate($update_id, null, null, $inline_query_id, null);
	} elseif ($update->getUpdateType() == 'chosen_inline_result') {
	$chosen_inline_query = $update->getChosenInlineResult();

	if (!self::isDbConnected()) {
	return false;
	}
	try {
	//Inline query Table
	$mysql_query = 'INSERT INTO `' . TB_CHOSEN_INLINE_QUERY . '`
	(
	`result_id`, `user_id`, `query`, `created_at`
	)
	VALUES (
	:result_id, :user_id, :query, :created_at
	)';

	$sth_insert_chosen_inline_query = self::$pdo->prepare($mysql_query);

	$date = self::getTimestamp(time());
	$result_id = $chosen_inline_query->getResultId();
	$from = $chosen_inline_query->getFrom();
	$user_id = null;
	if (is_object($from)) {
	$user_id = $from->getId();
	self::insertUser($from, $date);
	}

	$query = $chosen_inline_query->getQuery();

	$sth_insert_chosen_inline_query->bindParam(':result_id', $result_id, \PDO::PARAM_STR);
	$sth_insert_chosen_inline_query->bindParam(':user_id', $user_id, \PDO::PARAM_INT);
	$sth_insert_chosen_inline_query->bindParam(':query', $query, \PDO::PARAM_STR);
	$sth_insert_chosen_inline_query->bindParam(':created_at', $date, \PDO::PARAM_STR);

	$status = $sth_insert_chosen_inline_query->execute();
	$chosen_inline_query_local_id = self::$pdo->lastInsertId();

	} catch (PDOException $e) {
	throw new TelegramException($e->getMessage());
	}

	return self::insertTelegramUpdate($update_id, null, null, null, $chosen_inline_query_local_id);
	}
	}

	/**
	* Insert inline query request into database
	*
	* @todo No return value at the end. Just return true?
	*
	* @param Entities\InlineQuery &$inline_query
	*
	* @return bool
	*/
	public static function insertInlineQueryRequest(InlineQuery &$inline_query)
	{
	if (!self::isDbConnected()) {
	return false;
	}
	try {
	//Inline query Table
	$mysql_query = 'INSERT IGNORE INTO `' . TB_INLINE_QUERY . '`
	(
	`id`, `user_id`, `query`, `offset`, `created_at`
	)
	VALUES (
	:inline_query_id, :user_id, :query, :param_offset, :created_at
	)';

	$sth_insert_inline_query = self::$pdo->prepare($mysql_query);

	$date = self::getTimestamp(time());
	$inline_query_id = (int) $inline_query->getId();
	$from = $inline_query->getFrom();
	$user_id = null;
	if (is_object($from)) {
	$user_id = $from->getId();
	self::insertUser($from, $date);
	}

	$query = $inline_query->getQuery();
	$offset = $inline_query->getOffset();

	$sth_insert_inline_query->bindParam(':inline_query_id', $inline_query_id, \PDO::PARAM_INT);
	$sth_insert_inline_query->bindParam(':user_id', $user_id, \PDO::PARAM_INT);
	$sth_insert_inline_query->bindParam(':query', $query, \PDO::PARAM_STR);
	$sth_insert_inline_query->bindParam(':param_offset', $offset, \PDO::PARAM_STR);
	$sth_insert_inline_query->bindParam(':created_at', $date, \PDO::PARAM_STR);

	$status = $sth_insert_inline_query->execute();

	} catch (PDOException $e) {
	throw new TelegramException($e->getMessage());
	}
	}

	/**
	* Insert Message request in db
	*
	* @param Entities\Message &$message
	*
	* @return bool If the insert was successful
	*/
	public static function insertMessageRequest(Message &$message)
	{
	if (!self::isDbConnected()) {
	return false;
	}

	$from = $message->getFrom();
	$chat = $message->getChat();

	$chat_id = $chat->getId();

	$date = self::getTimestamp($message->getDate());
	$forward_from = $message->getForwardFrom();
	$forward_date = self::getTimestamp($message->getForwardDate());

	$photo = $message->getPhoto();
	$new_chat_participant = $message->getNewChatParticipant();

	$new_chat_photo = $message->getNewChatPhoto();
	$left_chat_participant = $message->getLeftChatParticipant();

	$migrate_from_chat_id = $message->getMigrateFromChatId();
	$migrate_to_chat_id = $message->getMigrateToChatId();

	try {
	//chat table
	$sth2 = self::$pdo->prepare('INSERT INTO `' . TB_CHAT . '`
	(
	`id`, `type`, `title`, `created_at` ,`updated_at`, `old_id`
	)
	VALUES (
	:id, :type, :title, :date, :date, :oldid
	)
	ON DUPLICATE KEY UPDATE `type`=:type, `title`=:title, `updated_at`=:date
	');

	$chat_title = $chat->getTitle();
	$type = $chat->getType();

	if ($migrate_to_chat_id) {

	$type = 'supergroup';

	$sth2->bindParam(':id', $migrate_to_chat_id, \PDO::PARAM_INT);
	$sth2->bindParam(':oldid', $chat_id, \PDO::PARAM_INT);

	} else {

	$sth2->bindParam(':id', $chat_id, \PDO::PARAM_INT);
	$sth2->bindParam(':oldid', $migrate_to_chat_id, \PDO::PARAM_INT);
	}

	$sth2->bindParam(':type', $type, \PDO::PARAM_INT);
	$sth2->bindParam(':title', $chat_title, \PDO::PARAM_STR, 255);
	$sth2->bindParam(':date', $date, \PDO::PARAM_STR);

	$status = $sth2->execute();

	} catch (PDOException $e) {
	throw new TelegramException($e->getMessage());
	}

	//Insert user and the relation with the chat
	self::insertUser($from, $date, $chat);

	//Insert the forwarded message user in users table
	$forward_from = null;
	if (is_object($forward_from)) {
	self::insertUser($forward_from, $forward_date);
	$forward_from = $forward_from->getId();
	}

	if ($new_chat_participant) {
	//Insert the new chat user
	self::insertUser($new_chat_participant, $date, $chat);
	$new_chat_participant = $new_chat_participant->getId();
	} elseif ($left_chat_participant) {
	//Insert the left chat user
	self::insertUser($left_chat_participant, $date, $chat);
	$left_chat_participant = $left_chat_participant->getId();
	}

	try {
	//message Table
	$sth = self::$pdo->prepare('INSERT IGNORE INTO `' . TB_MESSAGE . '`
	(
	`id`, `user_id`, `date`, `chat_id`, `forward_from`,
	`forward_date`, `reply_to_chat`, `reply_to_message`, `text`, `audio`, `document`,
	`photo`, `sticker`, `video`, `voice`, `caption`, `contact`,
	`location`, `new_chat_participant`, `left_chat_participant`,
	`new_chat_title`,`new_chat_photo`, `delete_chat_photo`, `group_chat_created`,
	`supergroup_chat_created`, `channel_chat_created`,
	`migrate_from_chat_id`, `migrate_to_chat_id`
	)
	VALUES (
	:message_id, :user_id, :date, :chat_id, :forward_from,
	:forward_date, :reply_to_chat, :reply_to_message, :text, :audio, :document,
	:photo, :sticker, :video, :voice, :caption, :contact,
	:location, :new_chat_participant, :left_chat_participant,
	:new_chat_title, :new_chat_photo, :delete_chat_photo, :group_chat_created,
	:supergroup_chat_created, :channel_chat_created,
	:migrate_from_chat_id, :migrate_to_chat_id
	)');

	$message_id = $message->getMessageId();
	$from_id = $from->getId();

	$reply_to_message = $message->getReplyToMessage();
	$reply_to_message_id = null;
	if (is_object($reply_to_message)) {
	$reply_to_message_id = $reply_to_message->getMessageId();
	// please notice that, as explaied in the documentation, reply_to_message don't contain other
	// reply_to_message field so recursion deep is 1
	self::insertMessageRequest($reply_to_message);
	}

	$text = $message->getText();
	$audio = $message->getAudio();
	$document = $message->getDocument();
	$sticker = $message->getSticker();
	$video = $message->getVideo();
	$voice = $message->getVoice();
	$caption = $message->getCaption();
	$contact = $message->getContact();
	$location = $message->getLocation();
	$new_chat_title = $message->getNewChatTitle();
	$delete_chat_photo = $message->getDeleteChatPhoto();
	$group_chat_created = $message->getGroupChatCreated();
	$supergroup_chat_created = $message->getSupergroupChatCreated();
	$channel_chat_created = $message->getChannelChatCreated();
	$migrate_from_chat_id = $message->getMigrateFromChatId();
	$migrate_to_chat_id = $message->getMigrateToChatId();

	$sth->bindParam(':chat_id', $chat_id, \PDO::PARAM_INT);
	$sth->bindParam(':message_id', $message_id, \PDO::PARAM_INT);
	$sth->bindParam(':user_id', $from_id, \PDO::PARAM_INT);
	$sth->bindParam(':date', $date, \PDO::PARAM_STR);
	$sth->bindParam(':forward_from', $forward_from, \PDO::PARAM_INT);
	$sth->bindParam(':forward_date', $forward_date, \PDO::PARAM_STR);
	$reply_chat_id = null;
	if ($reply_to_message_id) {
	$reply_chat_id = $chat_id;
	}
	$sth->bindParam(':reply_to_chat', $reply_chat_id, \PDO::PARAM_INT);
	$sth->bindParam(':reply_to_message', $reply_to_message_id, \PDO::PARAM_INT);
	$sth->bindParam(':text', $text, \PDO::PARAM_STR);
	$sth->bindParam(':audio', $audio, \PDO::PARAM_STR);
	$sth->bindParam(':document', $document, \PDO::PARAM_STR);

	$var = [];
	if (is_array($photo)) {
	foreach ($photo as $elm) {
	$var[] = json_decode($elm, true);
	}

	$photo = json_encode($var);
	} else {
	$photo = '';
	}

	$sth->bindParam(':photo', $photo, \PDO::PARAM_STR);
	$sth->bindParam(':sticker', $sticker, \PDO::PARAM_STR);
	$sth->bindParam(':video', $video, \PDO::PARAM_STR);
	$sth->bindParam(':voice', $voice, \PDO::PARAM_STR);
	$sth->bindParam(':caption', $caption, \PDO::PARAM_STR);
	$sth->bindParam(':contact', $contact, \PDO::PARAM_STR);
	$sth->bindParam(':location', $location, \PDO::PARAM_STR);
	$sth->bindParam(':new_chat_participant', $new_chat_participant, \PDO::PARAM_INT);
	$sth->bindParam(':left_chat_participant', $left_chat_participant, \PDO::PARAM_INT);
	$sth->bindParam(':new_chat_title', $new_chat_title, \PDO::PARAM_STR);

	//Array of Photosize
	$var = [];
	if (is_array($new_chat_photo)) {
	foreach ($new_chat_photo as $elm) {
	$var[] = json_decode($elm, true);
	}

	$new_chat_photo = json_encode($var);
	} else {
	$new_chat_photo = '';
	}

	$sth->bindParam(':new_chat_photo', $new_chat_photo, \PDO::PARAM_STR);
	$sth->bindParam(':delete_chat_photo', $delete_chat_photo, \PDO::PARAM_STR);
	$sth->bindParam(':group_chat_created', $group_chat_created, \PDO::PARAM_STR);
	$sth->bindParam(':supergroup_chat_created', $supergroup_chat_created, \PDO::PARAM_INT);
	$sth->bindParam(':channel_chat_created', $channel_chat_created, \PDO::PARAM_INT);
	$sth->bindParam(':migrate_from_chat_id', $migrate_from_chat_id, \PDO::PARAM_INT);
	$sth->bindParam(':migrate_to_chat_id', $migrate_to_chat_id, \PDO::PARAM_INT);
	$status = $sth->execute();

	} catch (PDOException $e) {
	throw new TelegramException($e->getMessage());
	}

	return true;
	}

	/**
	* Select Group and single Chats
	*
	* @param bool $select_groups
	* @param bool $select_super_groups
	* @param bool $select_users
	* @param string $date_from
	* @param string $date_to
	*
	* @return array\|bool Selected chats or false if invalid arguments
	*/
	public static function selectChats(
	$select_groups = true,
	$select_super_groups = true,
	$select_users = true,
	$date_from = null,
	$date_to = null
	) {
	if (!self::isDbConnected()) {
	return false;
	}

	if (!$select_groups & !$select_users & !$select_super_groups) {
	return false;
	}

	try {
	$query = 'SELECT * ,
	' . TB_CHAT . '.`id` AS `chat_id`,
	' . TB_CHAT . '.`updated_at` AS `chat_updated_at`,
	' . TB_USER . '.`id` AS `user_id`
	FROM `' . TB_CHAT . '` LEFT JOIN `' . TB_USER . '`
	ON ' . TB_CHAT . '.`id`=' . TB_USER . '.`id`';

	//Building parts of query
	$chat_or_user = '';
	$where = [];
	$tokens = [];

	if (!$select_groups \|\| !$select_users \|\| !$select_super_groups) {
	if ($select_groups) {
	$where[] = TB_CHAT . '.`type` = "group"';
	}
	if ($select_super_groups) {
	$where[] = TB_CHAT . '.`type` = "supergroup"';
	}
	if ($select_users) {
	$where[] = TB_CHAT . '.`type` = "private"';
	}
	}

	if (! is_null($date_from)) {
	$where[] = TB_CHAT . '.`updated_at` >= :date_from';
	$tokens[':date_from'] = $date_from;
	}

	if (! is_null($date_to)) {
	$where[] = TB_CHAT . '.`updated_at` <= :date_to';
	$tokens[':date_to'] = $date_to;
	}

	$a = 0;
	foreach ($where as $part) {
	if ($a) {
	$query .= ' AND ' . $part;
	} else {
	$query .= ' WHERE ' . $part;
	++$a;
	}
	}

	$query .= ' ORDER BY ' . TB_CHAT . '.`updated_at` ASC';

	$sth = self::$pdo->prepare($query);
	$sth->execute($tokens);

	$result = $sth->fetchAll(\PDO::FETCH_ASSOC);

	} catch (PDOException $e) {
	throw new TelegramException($e->getMessage());
	}

	return $result;
	}
	}

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