<?php

/*
 * This file is part of MailSo.
 *
 * (c) 2014 Usenko Timur
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace MailSo\Mail;

/**
 * @category MailSo
 * @package Mail
 */
class MailClient
{
	/**
	 * @var \MailSo\Log\Logger
	 */
	private $oLogger;

	/**
	 * @var \MailSo\Imap\ImapClient
	 */
	private $oImapClient;

	/**
	 * @access private
	 */
	private function __construct()
	{
		$this->oLogger = null;

		$this->oImapClient = \MailSo\Imap\ImapClient::NewInstance();
		$this->oImapClient->SetTimeOuts(10, 300); // TODO
	}

	/**
	 * @return \MailSo\Mail\MailClient
	 */
	public static function NewInstance()
	{
		return new self();
	}

	/**
	 * @return \MailSo\Imap\ImapClient
	 */
	public function ImapClient()
	{
		return $this->oImapClient;
	}

	/**
	 * @param string $sServerName
	 * @param int $iPort = 143
	 * @param int $iSecurityType = \MailSo\Net\Enumerations\ConnectionSecurityType::AUTO_DETECT
	 * @param bool $bVerifySsl = false
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function Connect($sServerName, $iPort = 143,
		$iSecurityType = \MailSo\Net\Enumerations\ConnectionSecurityType::AUTO_DETECT, $bVerifySsl = false)
	{
		$this->oImapClient->Connect($sServerName, $iPort, $iSecurityType, $bVerifySsl);
		return $this;
	}

	/**
	 * @param string $sLogin
	 * @param string $sPassword
	 * @param string $sProxyAuthUser = ''
	 * @param bool $bUseAuthPlainIfSupported = false
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\LoginException
	 */
	public function Login($sLogin, $sPassword, $sProxyAuthUser = '', $bUseAuthPlainIfSupported = false)
	{
		$this->oImapClient->Login($sLogin, $sPassword, $sProxyAuthUser, $bUseAuthPlainIfSupported);
		return $this;
	}

	/**
	 * @param string $sXOAuth2Token
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\LoginException
	 */
	public function LoginWithXOauth2($sXOAuth2Token)
	{
		$this->oImapClient->LoginWithXOauth2($sXOAuth2Token);
		return $this;
	}

	/**
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Net\Exceptions\Exception
	 */
	public function Logout()
	{
		$this->oImapClient->Logout();
		return $this;
	}

	/**
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Net\Exceptions\Exception
	 */
	public function Disconnect()
	{
		$this->oImapClient->Disconnect();
		return $this;
	}

	/**
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Net\Exceptions\Exception
	 */
	public function LogoutAndDisconnect()
	{
		return $this->Logout()->Disconnect();
	}

	/**
	 * @return bool
	 */
	public function IsConnected()
	{
		return $this->oImapClient->IsConnected();
	}

	/**
	 * @return bool
	 */
	public function IsLoggined()
	{
		return $this->oImapClient->IsLoggined();
	}

	/**
	 * @return string
	 */
	private function getEnvelopeOrHeadersRequestString()
	{
		return \MailSo\Imap\Enumerations\FetchType::BODY_HEADER_PEEK;

//		return \MailSo\Imap\Enumerations\FetchType::ENVELOPE;
//
//		return \MailSo\Imap\Enumerations\FetchType::BuildBodyCustomHeaderRequest(array(
//			\MailSo\Mime\Enumerations\Header::RETURN_PATH,
//			\MailSo\Mime\Enumerations\Header::RECEIVED,
//			\MailSo\Mime\Enumerations\Header::MIME_VERSION,
//			\MailSo\Mime\Enumerations\Header::MESSAGE_ID,
//			\MailSo\Mime\Enumerations\Header::FROM_,
//			\MailSo\Mime\Enumerations\Header::TO_,
//			\MailSo\Mime\Enumerations\Header::CC,
//			\MailSo\Mime\Enumerations\Header::BCC,
//			\MailSo\Mime\Enumerations\Header::SENDER,
//			\MailSo\Mime\Enumerations\Header::REPLY_TO,
//			\MailSo\Mime\Enumerations\Header::IN_REPLY_TO,
//			\MailSo\Mime\Enumerations\Header::DATE,
//			\MailSo\Mime\Enumerations\Header::SUBJECT,
//			\MailSo\Mime\Enumerations\Header::X_MSMAIL_PRIORITY,
//			\MailSo\Mime\Enumerations\Header::IMPORTANCE,
//			\MailSo\Mime\Enumerations\Header::X_PRIORITY,
//			\MailSo\Mime\Enumerations\Header::CONTENT_TYPE,
//			\MailSo\Mime\Enumerations\Header::REFERENCES,
//			\MailSo\Mime\Enumerations\Header::X_DRAFT_INFO,
//			\MailSo\Mime\Enumerations\Header::RECEIVED_SPF,
//			\MailSo\Mime\Enumerations\Header::AUTHENTICATION_RESULTS,
//		), true);
	}

	/**
	 * @param string $sFolderName
	 * @param string $sMessageFlag
	 * @param bool $bSetAction = true
	 * @param bool $sSkipUnsupportedFlag = false
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 * @throws \MailSo\Mail\Exceptions\Exception
	 */
	public function MessageSetFlagToAll($sFolderName, $sMessageFlag, $bSetAction = true, $sSkipUnsupportedFlag = false)
	{
		$this->oImapClient->FolderSelect($sFolderName);

		$oFolderInfo = $this->oImapClient->FolderCurrentInformation();
		if (!$oFolderInfo || !$oFolderInfo->IsFlagSupported($sMessageFlag))
		{
			if (!$sSkipUnsupportedFlag)
			{
				throw new \MailSo\Mail\Exceptions\RuntimeException('Message flag "'.$sMessageFlag.'" is not supported.');
			}
		}

		if ($oFolderInfo && 0 < $oFolderInfo->Exists)
		{
			$sStoreAction = $bSetAction
				? \MailSo\Imap\Enumerations\StoreAction::ADD_FLAGS_SILENT
				: \MailSo\Imap\Enumerations\StoreAction::REMOVE_FLAGS_SILENT
			;

			$this->oImapClient->MessageStoreFlag('1:*', false, array($sMessageFlag), $sStoreAction);
		}
	}

	/**
	 * @param string $sFolderName
	 * @param array $aIndexRange
	 * @param bool $bIndexIsUid
	 * @param string $sMessageFlag
	 * @param bool $bSetAction = true
	 * @param bool $sSkipUnsupportedFlag = false
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 * @throws \MailSo\Mail\Exceptions\Exception
	 */
	public function MessageSetFlag($sFolderName, $aIndexRange, $bIndexIsUid, $sMessageFlag, $bSetAction = true, $sSkipUnsupportedFlag = false)
	{
		$this->oImapClient->FolderSelect($sFolderName);

		$oFolderInfo = $this->oImapClient->FolderCurrentInformation();
		if (!$oFolderInfo || !$oFolderInfo->IsFlagSupported($sMessageFlag))
		{
			if (!$sSkipUnsupportedFlag)
			{
				throw new \MailSo\Mail\Exceptions\RuntimeException('Message flag "'.$sMessageFlag.'" is not supported.');
			}
		}
		else
		{
			$sStoreAction = $bSetAction
				? \MailSo\Imap\Enumerations\StoreAction::ADD_FLAGS_SILENT
				: \MailSo\Imap\Enumerations\StoreAction::REMOVE_FLAGS_SILENT
			;

			$this->oImapClient->MessageStoreFlag(\MailSo\Base\Utils::PrepearFetchSequence($aIndexRange),
				$bIndexIsUid, array($sMessageFlag), $sStoreAction);
		}
	}

	/**
	 * @param string $sFolderName
	 * @param array $aIndexRange
	 * @param bool $bIndexIsUid
	 * @param bool $bSetAction = true
	 * @param bool $sSkipUnsupportedFlag = false
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function MessageSetFlagged($sFolderName, $aIndexRange, $bIndexIsUid, $bSetAction = true, $sSkipUnsupportedFlag = false)
	{
		$this->MessageSetFlag($sFolderName, $aIndexRange, $bIndexIsUid,
			\MailSo\Imap\Enumerations\MessageFlag::FLAGGED, $bSetAction, $sSkipUnsupportedFlag);
	}

	/**
	 * @param string $sFolderName
	 * @param bool $bSetAction = true
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function MessageSetSeenToAll($sFolderName, $bSetAction = true)
	{
		$this->MessageSetFlagToAll($sFolderName, \MailSo\Imap\Enumerations\MessageFlag::SEEN, $bSetAction, true);
	}

	/**
	 * @param string $sFolderName
	 * @param array $aIndexRange
	 * @param bool $bIndexIsUid
	 * @param bool $bSetAction = true
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function MessageSetSeen($sFolderName, $aIndexRange, $bIndexIsUid, $bSetAction = true)
	{
		$this->MessageSetFlag($sFolderName, $aIndexRange, $bIndexIsUid,
			\MailSo\Imap\Enumerations\MessageFlag::SEEN, $bSetAction, true);
	}

	/**
	 * @param string $sFolderName
	 * @param int $iIndex
	 * @param bool $bIndexIsUid = true
	 * @param \MailSo\Cache\CacheClient $oCacher = null
	 * @param int $iBodyTextLimit = null
	 *
	 * @return \MailSo\Mail\Message|false
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function Message($sFolderName, $iIndex, $bIndexIsUid = true, $oCacher = null, $iBodyTextLimit = null)
	{
		if (!\MailSo\Base\Validator::RangeInt($iIndex, 1))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$this->oImapClient->FolderSelect($sFolderName);

		$oBodyStructure = null;
		$oMessage = false;

		$aBodyPeekMimeIndexes = array();
		$aSignatureMimeIndexes = array();

		$aFetchResponse = $this->oImapClient->Fetch(array(\MailSo\Imap\Enumerations\FetchType::BODYSTRUCTURE), $iIndex, $bIndexIsUid);
		if (0 < \count($aFetchResponse) && isset($aFetchResponse[0]))
		{
			$oBodyStructure = $aFetchResponse[0]->GetFetchBodyStructure();
			if ($oBodyStructure)
			{
				$aTextParts = $oBodyStructure->SearchHtmlOrPlainParts();
				if (is_array($aTextParts) && 0 < \count($aTextParts))
				{
					foreach ($aTextParts as $oPart)
					{
						$aBodyPeekMimeIndexes[] = array($oPart->PartID(), $oPart->Size());
					}
				}

				$aSignatureParts = $oBodyStructure->SearchByContentType('application/pgp-signature');
				if (is_array($aSignatureParts) && 0 < \count($aSignatureParts))
				{
					foreach ($aSignatureParts as $oPart)
					{
						$aSignatureMimeIndexes[] = $oPart->PartID();
					}
				}
			}
		}

		$aFetchItems = array(
			\MailSo\Imap\Enumerations\FetchType::INDEX,
			\MailSo\Imap\Enumerations\FetchType::UID,
			\MailSo\Imap\Enumerations\FetchType::RFC822_SIZE,
			\MailSo\Imap\Enumerations\FetchType::INTERNALDATE,
			\MailSo\Imap\Enumerations\FetchType::FLAGS,
			$this->getEnvelopeOrHeadersRequestString()
		);

		if (0 < \count($aBodyPeekMimeIndexes))
		{
			foreach ($aBodyPeekMimeIndexes as $aTextMimeData)
			{
				$sLine = \MailSo\Imap\Enumerations\FetchType::BODY_PEEK.'['.$aTextMimeData[0].']';
				if (\is_numeric($iBodyTextLimit) && 0 < $iBodyTextLimit && $iBodyTextLimit < $aTextMimeData[1])
				{
					$sLine .= '<0.'.((int) $iBodyTextLimit).'>';
				}

				$aFetchItems[] = $sLine;
			}
		}

		if (0 < \count($aSignatureMimeIndexes))
		{
			foreach ($aSignatureMimeIndexes as $sTextMimeIndex)
			{
				$aFetchItems[] = \MailSo\Imap\Enumerations\FetchType::BODY_PEEK.'['.$sTextMimeIndex.']';
			}
		}

		if (!$oBodyStructure)
		{
			$aFetchItems[] = \MailSo\Imap\Enumerations\FetchType::BODYSTRUCTURE;
		}

		$aFetchResponse = $this->oImapClient->Fetch($aFetchItems, $iIndex, $bIndexIsUid);
		if (0 < \count($aFetchResponse))
		{
			$oMessage = \MailSo\Mail\Message::NewFetchResponseInstance(
				$sFolderName, $aFetchResponse[0], $oBodyStructure);
		}

		return $oMessage;
	}

	/**
	 * @param mixed $mCallback
	 * @param string $sFolderName
	 * @param int $iIndex
	 * @param bool $bIndexIsUid = true,
	 * @param string $sMimeIndex = ''
	 *
	 * @return bool
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function MessageMimeStream($mCallback, $sFolderName, $iIndex, $bIndexIsUid = true, $sMimeIndex = '')
	{
		if (!is_callable($mCallback))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$this->oImapClient->FolderSelect($sFolderName);

		$sFileName = '';
		$sContentType = '';
		$sMailEncodingName = '';

		$sMimeIndex = trim($sMimeIndex);
		$aFetchResponse = $this->oImapClient->Fetch(array(
			0 === \strlen($sMimeIndex)
				? \MailSo\Imap\Enumerations\FetchType::BODY_HEADER_PEEK
				: \MailSo\Imap\Enumerations\FetchType::BODY_PEEK.'['.$sMimeIndex.'.MIME]'
		), $iIndex, $bIndexIsUid);

		if (0 < \count($aFetchResponse))
		{
			$sMime = $aFetchResponse[0]->GetFetchValue(
				0 === \strlen($sMimeIndex)
					? \MailSo\Imap\Enumerations\FetchType::BODY_HEADER
					: \MailSo\Imap\Enumerations\FetchType::BODY.'['.$sMimeIndex.'.MIME]'
			);

			if (0 < \strlen($sMime))
			{
				$oHeaders = \MailSo\Mime\HeaderCollection::NewInstance()->Parse($sMime);

				if (0 < \strlen($sMimeIndex))
				{
					$sFileName = $oHeaders->ParameterValue(
						\MailSo\Mime\Enumerations\Header::CONTENT_DISPOSITION,
						\MailSo\Mime\Enumerations\Parameter::FILENAME);

					if (0 === \strlen($sFileName))
					{
						$sFileName = $oHeaders->ParameterValue(
							\MailSo\Mime\Enumerations\Header::CONTENT_TYPE,
							\MailSo\Mime\Enumerations\Parameter::NAME);
					}

					$sMailEncodingName = $oHeaders->ValueByName(
						\MailSo\Mime\Enumerations\Header::CONTENT_TRANSFER_ENCODING);

					$sContentType = $oHeaders->ValueByName(
						\MailSo\Mime\Enumerations\Header::CONTENT_TYPE);
				}
				else
				{
					$sSubject = $oHeaders->ValueByName(\MailSo\Mime\Enumerations\Header::SUBJECT);

					$sFileName = 0 === \strlen($sSubject) ? (string) $iIndex : $sSubject;
					$sFileName .= '.eml';

					$sContentType = 'message/rfc822';
				}
			}
		}

		$aFetchResponse = $this->oImapClient->Fetch(array(
			array(\MailSo\Imap\Enumerations\FetchType::BODY_PEEK.'['.$sMimeIndex.']',
				function ($sParent, $sLiteralAtomUpperCase, $rImapLiteralStream) use ($mCallback, $sMimeIndex, $sMailEncodingName, $sContentType, $sFileName)
				{
					if (0 < \strlen($sLiteralAtomUpperCase))
					{
						if (is_resource($rImapLiteralStream) && 'FETCH' === $sParent)
						{
							$rMessageMimeIndexStream = (0 === \strlen($sMailEncodingName))
								? $rImapLiteralStream
								: \MailSo\Base\StreamWrappers\Binary::CreateStream($rImapLiteralStream,
									\MailSo\Base\StreamWrappers\Binary::GetInlineDecodeOrEncodeFunctionName(
										$sMailEncodingName, true));

							\call_user_func($mCallback, $rMessageMimeIndexStream, $sContentType, $sFileName, $sMimeIndex);
						}
					}
				}
			)), $iIndex, $bIndexIsUid);

		return ($aFetchResponse && 1 === \count($aFetchResponse));
	}

	/**
	 * @param string $sFolder
	 * @param array $aIndexRange
	 * @param bool $bIndexIsUid
	 * @param bool $bUseExpunge = true
	 * @param bool $bExpungeAll = false
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function MessageDelete($sFolder, $aIndexRange, $bIndexIsUid, $bUseExpunge = true, $bExpungeAll = false)
	{
		if (0 === \strlen($sFolder) || !\is_array($aIndexRange) || 0 === \count($aIndexRange))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$this->oImapClient->FolderSelect($sFolder);

		$sIndexRange = \MailSo\Base\Utils::PrepearFetchSequence($aIndexRange);

		$this->oImapClient->MessageStoreFlag($sIndexRange, $bIndexIsUid,
			array(\MailSo\Imap\Enumerations\MessageFlag::DELETED),
			\MailSo\Imap\Enumerations\StoreAction::ADD_FLAGS_SILENT
		);

		if ($bUseExpunge)
		{
			$this->oImapClient->MessageExpunge($bIndexIsUid ? $sIndexRange : '', $bIndexIsUid, $bExpungeAll);
		}

		return $this;
	}

	/**
	 * @param string $sFromFolder
	 * @param string $sToFolder
	 * @param array $aIndexRange
	 * @param bool $bIndexIsUid
	 * @param bool $bUseMoveSupported = false
	 * @param bool $bExpungeAll = false
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function MessageMove($sFromFolder, $sToFolder, $aIndexRange, $bIndexIsUid, $bUseMoveSupported = false, $bExpungeAll = false)
	{
		if (0 === \strlen($sFromFolder) || 0 === \strlen($sToFolder) ||
			!\is_array($aIndexRange) || 0 === \count($aIndexRange))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$this->oImapClient->FolderSelect($sFromFolder);

		if ($bUseMoveSupported && $this->oImapClient->IsSupported('MOVE'))
		{
			$this->oImapClient->MessageMove($sToFolder,
				\MailSo\Base\Utils::PrepearFetchSequence($aIndexRange), $bIndexIsUid);
		}
		else
		{
			$this->oImapClient->MessageCopy($sToFolder,
				\MailSo\Base\Utils::PrepearFetchSequence($aIndexRange), $bIndexIsUid);

			$this->MessageDelete($sFromFolder, $aIndexRange, $bIndexIsUid, true, $bExpungeAll);
		}

		return $this;
	}

	/**
	 * @param string $sFromFolder
	 * @param string $sToFolder
	 * @param array $aIndexRange
	 * @param bool $bIndexIsUid
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function MessageCopy($sFromFolder, $sToFolder, $aIndexRange, $bIndexIsUid)
	{
		if (0 === \strlen($sFromFolder) || 0 === \strlen($sToFolder) ||
			!\is_array($aIndexRange) || 0 === \count($aIndexRange))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$this->oImapClient->FolderSelect($sFromFolder);
		$this->oImapClient->MessageCopy($sToFolder,
			\MailSo\Base\Utils::PrepearFetchSequence($aIndexRange), $bIndexIsUid);

		return $this;
	}

	/**
	 * @param resource $rMessageStream
	 * @param int $iMessageStreamSize
	 * @param string $sFolderToSave
	 * @param array $aAppendFlags = null
	 * @param int $iUid = null
	 *
	 * @return \MailSo\Mail\MailClient
	 */
	public function MessageAppendStream($rMessageStream, $iMessageStreamSize, $sFolderToSave, $aAppendFlags = null, &$iUid = null)
	{
		if (!\is_resource($rMessageStream) || 0 === \strlen($sFolderToSave))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$this->oImapClient->MessageAppendStream(
			$sFolderToSave, $rMessageStream, $iMessageStreamSize, $aAppendFlags, $iUid);

		return $this;
	}

	/**
	 * @param string $sMessageFileName
	 * @param string $sFolderToSave
	 * @param array $aAppendFlags = null
	 * @param int &$iUid = null
	 *
	 * @return \MailSo\Mail\MailClient
	 */
	public function MessageAppendFile($sMessageFileName, $sFolderToSave, $aAppendFlags = null, &$iUid = null)
	{
		if (!@\is_file($sMessageFileName) || !@\is_readable($sMessageFileName))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$iMessageStreamSize = \filesize($sMessageFileName);
		$rMessageStream = \fopen($sMessageFileName, 'rb');

		$this->MessageAppendStream($rMessageStream, $iMessageStreamSize, $sFolderToSave, $aAppendFlags, $iUid);

		if (\is_resource($rMessageStream))
		{
			@fclose($rMessageStream);
		}

		return $this;
	}

	/**
	 * @param string $sFolderName
	 * @param int $iCount
	 * @param int $iUnseenCount
	 * @param string $sUidNext
	 *
	 * @return void
	 */
	protected function initFolderValues($sFolderName, &$iCount, &$iUnseenCount, &$sUidNext)
	{
		$aFolderStatus = $this->oImapClient->FolderStatus($sFolderName, array(
			\MailSo\Imap\Enumerations\FolderResponseStatus::MESSAGES,
			\MailSo\Imap\Enumerations\FolderResponseStatus::UNSEEN,
			\MailSo\Imap\Enumerations\FolderResponseStatus::UIDNEXT
		));

		$iCount = isset($aFolderStatus[\MailSo\Imap\Enumerations\FolderResponseStatus::MESSAGES])
			? (int) $aFolderStatus[\MailSo\Imap\Enumerations\FolderResponseStatus::MESSAGES] : 0;

		$iUnseenCount = isset($aFolderStatus[\MailSo\Imap\Enumerations\FolderResponseStatus::UNSEEN])
			? (int) $aFolderStatus[\MailSo\Imap\Enumerations\FolderResponseStatus::UNSEEN] : 0;

		$sUidNext = isset($aFolderStatus[\MailSo\Imap\Enumerations\FolderResponseStatus::UIDNEXT])
			? (string) $aFolderStatus[\MailSo\Imap\Enumerations\FolderResponseStatus::UIDNEXT] : '0';

		if ($this->IsGmail())
		{
			$oFolder = $this->oImapClient->FolderCurrentInformation();
			if ($oFolder && null !== $oFolder->Exists && $oFolder->FolderName === $sFolderName)
			{
				$iSubCount = (int) $oFolder->Exists;
				if (0 < $iSubCount && $iSubCount < $iCount)
				{
					$iCount = $iSubCount;
				}
			}
		}
	}

	/**
	 * @param string $sFolder
	 * @param int $iCount
	 * @param int $iUnseenCount
	 * @param string $sUidNext
	 *
	 * @return string
	 */
	public static function GenerateHash($sFolder, $iCount, $iUnseenCount, $sUidNext)
	{
		$iUnseenCount = 0; // unneccessery
		return \md5($sFolder.'-'.$iCount.'-'.$iUnseenCount.'-'.$sUidNext);
	}

	/**
	 * @param string $sFolderName
	 * @param string $sPrevUidNext
	 * @param string $sCurrentUidNext
	 *
	 * @return array
	 */
	private function getFolderNextMessageInformation($sFolderName, $sPrevUidNext, $sCurrentUidNext)
	{
		$aNewMessages = array();

		if (0 < \strlen($sPrevUidNext) && (string) $sPrevUidNext !== (string) $sCurrentUidNext)
		{
			$this->oImapClient->FolderSelect($sFolderName);

			$aFetchResponse = $this->oImapClient->Fetch(array(
				\MailSo\Imap\Enumerations\FetchType::INDEX,
				\MailSo\Imap\Enumerations\FetchType::UID,
				\MailSo\Imap\Enumerations\FetchType::FLAGS,
				\MailSo\Imap\Enumerations\FetchType::BuildBodyCustomHeaderRequest(array(
					\MailSo\Mime\Enumerations\Header::FROM_,
					\MailSo\Mime\Enumerations\Header::SUBJECT,
					\MailSo\Mime\Enumerations\Header::CONTENT_TYPE
				))
			), $sPrevUidNext.':*', true);

			if (\is_array($aFetchResponse) && 0 < \count($aFetchResponse))
			{
				foreach ($aFetchResponse as /* @var $oFetchResponse \MailSo\Imap\FetchResponse */ $oFetchResponse)
				{
					$aFlags = \array_map('strtolower', $oFetchResponse->GetFetchValue(
						\MailSo\Imap\Enumerations\FetchType::FLAGS));

					if (\in_array(\strtolower(\MailSo\Imap\Enumerations\MessageFlag::RECENT), $aFlags) ||
						!\in_array(\strtolower(\MailSo\Imap\Enumerations\MessageFlag::SEEN), $aFlags))
					{
						$sUid = $oFetchResponse->GetFetchValue(\MailSo\Imap\Enumerations\FetchType::UID);
						$sHeaders = $oFetchResponse->GetHeaderFieldsValue();

						$oHeaders = \MailSo\Mime\HeaderCollection::NewInstance()->Parse($sHeaders);

						$sContentTypeCharset = $oHeaders->ParameterValue(
							\MailSo\Mime\Enumerations\Header::CONTENT_TYPE,
							\MailSo\Mime\Enumerations\Parameter::CHARSET
						);

						$sCharset = '';
						if (0 < \strlen($sContentTypeCharset))
						{
							$sCharset = $sContentTypeCharset;
						}

						if (0 < \strlen($sCharset))
						{
							$oHeaders->SetParentCharset($sCharset);
						}

						$aNewMessages[] = array(
							'Folder' => $sFolderName,
							'Uid' => $sUid,
							'Subject' => $oHeaders->ValueByName(\MailSo\Mime\Enumerations\Header::SUBJECT, 0 === \strlen($sCharset)),
							'From' => $oHeaders->GetAsEmailCollection(\MailSo\Mime\Enumerations\Header::FROM_, 0 === \strlen($sCharset))
						);
					}
				}
			}
		}

		return $aNewMessages;
	}

	/**
	 * @param string $sFolderName
	 * @param string $sPrevUidNext = ''
	 * @param array $aUids = ''
	 *
	 * @return string
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function FolderInformation($sFolderName, $sPrevUidNext = '', $aUids = array())
	{
		$aFlags = array();

		$bSelect = false;
		if ($this->IsGmail())
		{
			$this->oImapClient->FolderSelect($sFolderName);
			$bSelect = true;
		}

		if (\is_array($aUids) && 0 < \count($aUids))
		{
			if (!$bSelect)
			{
				$this->oImapClient->FolderSelect($sFolderName);
			}

			$aFetchResponse = $this->oImapClient->Fetch(array(
				\MailSo\Imap\Enumerations\FetchType::INDEX,
				\MailSo\Imap\Enumerations\FetchType::UID,
				\MailSo\Imap\Enumerations\FetchType::FLAGS
			), \MailSo\Base\Utils::PrepearFetchSequence($aUids), true);

			if (\is_array($aFetchResponse) && 0 < \count($aFetchResponse))
			{
				foreach ($aFetchResponse as $oFetchResponse)
				{
					$sUid = $oFetchResponse->GetFetchValue(\MailSo\Imap\Enumerations\FetchType::UID);
					$aFlags[(\is_numeric($sUid) ? (int) $sUid : 0)] =
						$oFetchResponse->GetFetchValue(\MailSo\Imap\Enumerations\FetchType::FLAGS);
				}
			}
		}

		$iCount = 0;
		$iUnseenCount = 0;
		$sUidNext = '0';

		$this->initFolderValues($sFolderName, $iCount, $iUnseenCount, $sUidNext);

		$aResult = array(
			'Folder' => $sFolderName,
			'Hash' => self::GenerateHash($sFolderName, $iCount, $iUnseenCount, $sUidNext),
			'MessageCount' => $iCount,
			'MessageUnseenCount' => $iUnseenCount,
			'UidNext' => $sUidNext,
			'Flags' => $aFlags,
			'NewMessages' => 'INBOX' === $sFolderName ?
				$this->getFolderNextMessageInformation($sFolderName, $sPrevUidNext, $sUidNext) : array()
		);

		return $aResult;
	}

	/**
	 * @param string $sFolderName
	 *
	 * @return string
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function FolderHash($sFolderName)
	{
		$iCount = 0;
		$iUnseenCount = 0;
		$sUidNext = '0';

		$this->initFolderValues($sFolderName, $iCount, $iUnseenCount, $sUidNext);

		return self::GenerateHash($sFolderName, $iCount, $iUnseenCount, $sUidNext);
	}

	/**
	 * @return int
	 *
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function InboxUnreadCount()
	{
		$aFolderStatus = $this->oImapClient->FolderStatus('INBOX', array(
			\MailSo\Imap\Enumerations\FolderResponseStatus::UNSEEN
		));

		$iResult = isset($aFolderStatus[\MailSo\Imap\Enumerations\FolderResponseStatus::UNSEEN]) ?
			(int) $aFolderStatus[\MailSo\Imap\Enumerations\FolderResponseStatus::UNSEEN] : 0;

		return 0 < $iResult ? $iResult : 0;
	}

	/**
	 * @param string $sSearch
	 * @param bool $bDetectGmail = true
	 *
	 * @return string
	 */
	public function IsGmail()
	{
		return 'ssl://imap.gmail.com' === \strtolower($this->oImapClient->GetConnectedHost());
	}

	/**
	 * @param string $sSearch
	 * @param bool $bDetectGmail = true
	 *
	 * @return string
	 */
	private function escapeSearchString($sSearch, $bDetectGmail = true)
	{
		return ($bDetectGmail && !\MailSo\Base\Utils::IsAscii($sSearch) && $this->IsGmail())
			? '{'.\strlen($sSearch).'+}'."\r\n".$sSearch : $this->oImapClient->EscapeString($sSearch);
	}

	/**
	 * @param string $sDate
	 * @param int $iTimeZoneOffset
	 *
	 * @return int
	 */
	private function parseSearchDate($sDate, $iTimeZoneOffset)
	{
		$iResult = 0;
		if (0 < \strlen($sDate))
		{
			$oDateTime = \DateTime::createFromFormat('Y.m.d', $sDate, \MailSo\Base\DateTimeHelper::GetUtcTimeZoneObject());
			return $oDateTime ? $oDateTime->getTimestamp() - $iTimeZoneOffset : 0;
		}

		return $iResult;
	}

	/**
	 * @param string $sSize
	 *
	 * @return int
	 */
	private function parseFriendlySize($sSize)
	{
		$sSize = preg_replace('/[^0-9bBkKmM]/', '', $sSize);

		$iResult = 0;
		$aMatch = array();

		if (\preg_match('/([\d]+)(B|KB|M|MB|G|GB)$/i', $sSize, $aMatch) && isset($aMatch[1], $aMatch[2]))
		{
			$iResult = (int) $aMatch[1];
			switch (\strtoupper($aMatch[2]))
			{
				case 'K':
				case 'KB':
					$iResult *= 1024;
				case 'M':
				case 'MB':
					$iResult *= 1024;
				case 'G':
				case 'GB':
					$iResult *= 1024;
			}
		}
		else
		{
			$iResult = (int) $sSize;
		}

		return $iResult;
	}

	/**
	 * @param string $sSearch
	 *
	 * @return array
	 */
	private function parseSearchString($sSearch)
	{
		$aResult = array(
			'OTHER' => ''
		);

		$aCache = array();

		$sReg = 'e?mail|from|to|subject|has|is|date|text|body|size|larger|bigger|smaller|maxsize|minsize';

		$sSearch = \trim(\preg_replace('/[\s]+/', ' ', $sSearch));
		$sSearch = \trim(\preg_replace('/('.$sReg.'): /i', '\\1:', $sSearch));

		$mMatch = array();
		\preg_match_all('/".*?(?<!\\\)"/', $sSearch, $mMatch);
		if (\is_array($mMatch) && isset($mMatch[0]) && \is_array($mMatch[0]) && 0 < \count($mMatch[0]))
		{
			foreach ($mMatch[0] as $sItem)
			{
				do
				{
					$sKey = \md5(\rand(10000, 90000).\microtime(true));
				}
				while (isset($aCache[$sKey]));

				$aCache[$sKey] = \stripcslashes($sItem);
				$sSearch = \str_replace($sItem, $sKey, $sSearch);
			}
		}

		\preg_match_all('/\'.*?(?<!\\\)\'/', $sSearch, $mMatch);
		if (\is_array($mMatch) && isset($mMatch[0]) && \is_array($mMatch[0]) && 0 < \count($mMatch[0]))
		{
			foreach ($mMatch[0] as $sItem)
			{
				do
				{
					$sKey = \md5(\rand(10000, 90000).\microtime(true));
				}
				while (isset($aCache[$sKey]));

				$aCache[$sKey] = \stripcslashes($sItem);
				$sSearch = \str_replace($sItem, $sKey, $sSearch);
			}
		}

		$mMatch = array();
		\preg_match_all('/('.$sReg.'):([^\s]*)/i', $sSearch, $mMatch);
		if (\is_array($mMatch) && isset($mMatch[1]) && \is_array($mMatch[1]) && 0 < \count($mMatch[1]))
		{
			if (\is_array($mMatch[0]))
			{
				foreach ($mMatch[0] as $sToken)
				{
					$sSearch = \str_replace($sToken, '', $sSearch);
				}

				$sSearch = \trim(\preg_replace('/[\s]+/', ' ', $sSearch));
			}

			foreach ($mMatch[1] as $iIndex => $sName)
			{
				if (isset($mMatch[2][$iIndex]) && 0 < \strlen($mMatch[2][$iIndex]))
				{
					$sName = \strtoupper($sName);
					$sValue = $mMatch[2][$iIndex];
					switch ($sName)
					{
						case 'TEXT':
						case 'BODY':
						case 'EMAIL':
						case 'MAIL':
						case 'FROM':
						case 'TO':
						case 'SUBJECT':
						case 'IS':
						case 'HAS':
						case 'SIZE':
						case 'SMALLER':
						case 'LARGER':
						case 'BIGGER':
						case 'MAXSIZE':
						case 'MINSIZE':
						case 'DATE':
							if ('MAIL' === $sName)
							{
								$sName = 'EMAIL';
							}
							if ('BODY' === $sName)
							{
								$sName = 'TEXT';
							}
							if ('SIZE' === $sName || 'BIGGER' === $sName || 'MINSIZE' === $sName)
							{
								$sName = 'LARGER';
							}
							if ('MAXSIZE' === $sName)
							{
								$sName = 'SMALLER';
							}
							$aResult[$sName] = $sValue;
							break;
					}
				}
			}
		}

		$aResult['OTHER'] = $sSearch;
		foreach ($aResult as $sName => $sValue)
		{
			if (isset($aCache[$sValue]))
			{
				$aResult[$sName] = \trim($aCache[$sValue], '"\' ');
			}
		}

		return $aResult;
	}

	/**
	 * @param string $sSearch
	 * @param int $iTimeZoneOffset = 0
	 * @param bool $bUseCache = true
	 *
	 * @return string
	 */
	private function getImapSearchCriterias($sSearch, $iTimeZoneOffset = 0, &$bUseCache = true)
	{
		$bUseCache = true;
		$iTimeFilter = 0;
		$aCriteriasResult = array();

		if (0 < \MailSo\Config::$MessageListDateFilter)
		{
			$iD = \time() - 3600 * 24 * 30 * \MailSo\Config::$MessageListDateFilter;
			$iTimeFilter = \gmmktime(1, 1, 1, \gmdate('n', $iD), 1, \gmdate('Y', $iD));
		}

		if (0 < \strlen(\trim($sSearch)))
		{
			$sGmailRawSearch = '';
			$sResultBodyTextSearch = '';

			$aLines = $this->parseSearchString($sSearch);
			$bIsGmail = $this->oImapClient->IsSupported('X-GM-EXT-1');

			if (1 === \count($aLines) && isset($aLines['OTHER']))
			{
				$sValue = $this->escapeSearchString($aLines['OTHER']);

				if (\MailSo\Config::$MessageListFastSimpleSearch)
				{
					$aCriteriasResult[] = 'OR OR OR';
					$aCriteriasResult[] = 'FROM';
					$aCriteriasResult[] = $sValue;
					$aCriteriasResult[] = 'TO';
					$aCriteriasResult[] = $sValue;
					$aCriteriasResult[] = 'CC';
					$aCriteriasResult[] = $sValue;
					$aCriteriasResult[] = 'SUBJECT';
					$aCriteriasResult[] = $sValue;
				}
				else
				{
					$aCriteriasResult[] = 'TEXT';
					$aCriteriasResult[] = $sValue;
				}
			}
			else
			{
				if (isset($aLines['EMAIL']))
				{
					$sValue = $this->escapeSearchString($aLines['EMAIL']);

					$aCriteriasResult[] = 'OR OR';
					$aCriteriasResult[] = 'FROM';
					$aCriteriasResult[] = $sValue;
					$aCriteriasResult[] = 'TO';
					$aCriteriasResult[] = $sValue;
					$aCriteriasResult[] = 'CC';
					$aCriteriasResult[] = $sValue;

					unset($aLines['EMAIL']);
				}

				if (isset($aLines['TO']))
				{
					$sValue = $this->escapeSearchString($aLines['TO']);

					$aCriteriasResult[] = 'OR';
					$aCriteriasResult[] = 'TO';
					$aCriteriasResult[] = $sValue;
					$aCriteriasResult[] = 'CC';
					$aCriteriasResult[] = $sValue;

					unset($aLines['TO']);
				}

				$sMainText = '';
				foreach ($aLines as $sName => $sRawValue)
				{
					if ('' === \trim($sRawValue))
					{
						continue;
					}

					$sValue = $this->escapeSearchString($sRawValue);
					switch ($sName)
					{
						case 'FROM':
							$aCriteriasResult[] = 'FROM';
							$aCriteriasResult[] = $sValue;
							break;
						case 'SUBJECT':
							$aCriteriasResult[] = 'SUBJECT';
							$aCriteriasResult[] = $sValue;
							break;
						case 'OTHER':
						case 'TEXT':
							$sMainText .= ' '.$sRawValue;
							break;
						case 'HAS':
							$aValue = \explode(',', \strtolower($sRawValue));
							$aValue = \array_map('trim', $aValue);

							$aCompareArray = array('file', 'files', 'attach', 'attachs', 'attachment', 'attachments');
							if (\count($aCompareArray) > \count(\array_diff($aCompareArray, $aValue)))
							{
								if ($bIsGmail)
								{
									$sGmailRawSearch .= ' has:attachment';
								}
								else
								{
									// Simple, is not detailed search (Sometimes doesn't work)
									$aCriteriasResult[] = 'OR OR OR';
									$aCriteriasResult[] = 'HEADER Content-Type application/';
									$aCriteriasResult[] = 'HEADER Content-Type multipart/m';
									$aCriteriasResult[] = 'HEADER Content-Type multipart/signed';
									$aCriteriasResult[] = 'HEADER Content-Type multipart/report';
								}
							}

						case 'IS':
							$aValue = \explode(',', \strtolower($sRawValue));
							$aValue = \array_map('trim', $aValue);

							$aCompareArray = array('flag', 'flagged', 'star', 'starred', 'pinned');
							$aCompareArray2 = array('unflag', 'unflagged', 'unstar', 'unstarred', 'unpinned');
							if (\count($aCompareArray) > \count(\array_diff($aCompareArray, $aValue)))
							{
								$aCriteriasResult[] = 'FLAGGED';
								$bUseCache = false;
							}
							else if (\count($aCompareArray2) > \count(\array_diff($aCompareArray2, $aValue)))
							{
								$aCriteriasResult[] = 'UNFLAGGED';
								$bUseCache = false;
							}

							$aCompareArray = array('unread', 'unseen');
							$aCompareArray2 = array('read', 'seen');
							if (\count($aCompareArray) > \count(\array_diff($aCompareArray, $aValue)))
							{
								$aCriteriasResult[] = 'UNSEEN';
								$bUseCache = false;
							}
							else if (\count($aCompareArray2) > \count(\array_diff($aCompareArray2, $aValue)))
							{
								$aCriteriasResult[] = 'SEEN';
								$bUseCache = false;
							}
							break;

						case 'LARGER':
							$aCriteriasResult[] = 'LARGER';
							$aCriteriasResult[] =  $this->parseFriendlySize($sRawValue);
							break;
						case 'SMALLER':
							$aCriteriasResult[] = 'SMALLER';
							$aCriteriasResult[] =  $this->parseFriendlySize($sRawValue);
							break;
						case 'DATE':
							$iDateStampFrom = $iDateStampTo = 0;

							$sDate = $sRawValue;
							$aDate = \explode('/', $sDate);

							if (\is_array($aDate) && 2 === \count($aDate))
							{
								if (0 < \strlen($aDate[0]))
								{
									$iDateStampFrom = $this->parseSearchDate($aDate[0], $iTimeZoneOffset);
								}

								if (0 < \strlen($aDate[1]))
								{
									$iDateStampTo = $this->parseSearchDate($aDate[1], $iTimeZoneOffset);
									$iDateStampTo += 60 * 60 * 24;
								}
							}
							else
							{
								if (0 < \strlen($sDate))
								{
									$iDateStampFrom = $this->parseSearchDate($sDate, $iTimeZoneOffset);
									$iDateStampTo = $iDateStampFrom + 60 * 60 * 24;
								}
							}

							if (0 < $iDateStampFrom)
							{
								$aCriteriasResult[] = 'SINCE';
								$aCriteriasResult[] = \gmdate('j-M-Y', $iTimeFilter > $iDateStampFrom ?
									$iDateStampFrom : $iTimeFilter);

								if (0 < $iTimeFilter && $iTimeFilter > $iDateStampFrom)
								{
									$iTimeFilter = 0;
								}
							}

							if (0 < $iDateStampTo)
							{
								$aCriteriasResult[] = 'BEFORE';
								$aCriteriasResult[] = \gmdate('j-M-Y', $iDateStampTo);
							}
							break;
					}
				}

				if ('' !== \trim($sMainText))
				{
					$sMainText = \trim(\trim(preg_replace('/[\s]+/', ' ', $sMainText)), '"');
					if ($bIsGmail)
					{
						$sGmailRawSearch .= ' '.$sMainText;
					}
					else
					{
						$sResultBodyTextSearch .= ' '.$sMainText;
					}
				}
			}

			$sGmailRawSearch = \trim($sGmailRawSearch);
			if ($bIsGmail && 0 < \strlen($sGmailRawSearch))
			{
				$aCriteriasResult[] = 'X-GM-RAW';
				$aCriteriasResult[] = $this->escapeSearchString($sGmailRawSearch, false);
			}

			$sResultBodyTextSearch = \trim($sResultBodyTextSearch);
			if (0 < \strlen($sResultBodyTextSearch))
			{
				$aCriteriasResult[] = 'BODY';
				$aCriteriasResult[] = $this->escapeSearchString($sResultBodyTextSearch);
			}
		}

		$sCriteriasResult = \trim(\implode(' ', $aCriteriasResult));

		if (0 < $iTimeFilter)
		{
			$sCriteriasResult .= ' SINCE '.\gmdate('j-M-Y', $iTimeFilter);
		}

		$sCriteriasResult = \trim($sCriteriasResult);
		if ('' === $sCriteriasResult)
		{
			$sCriteriasResult = 'ALL';
		}

		return $sCriteriasResult;
	}

	/**
	 * @param array $aThreads
	 * @return array
	 */
	private function threadArrayMap($aThreads)
	{
		$aNew = array();
		foreach ($aThreads as $mItem)
		{
			if (!\is_array($mItem))
			{
				$aNew[] = $mItem;
			}
			else
			{
				$mMap = $this->threadArrayMap($mItem);
				if (\is_array($mMap) && 0 < \count($mMap))
				{
					$aNew = \array_merge($aNew, $mMap);
				}
			}
		}

		return $aNew;
	}

	/**
	 * @param array $aThreads
	 *
	 * @return array
	 */
	private function compileThreadArray($aThreads)
	{
		$aResult = array();
		foreach ($aThreads as $mItem)
		{
			if (\is_array($mItem))
			{
				$aMap = $this->threadArrayMap($mItem);
				if (\is_array($aMap))
				{
					if (1 < \count($aMap))
					{
						$aResult[] = $aMap;
					}
					else if (0 < \count($aMap))
					{
						$aResult[] = $aMap[0];
					}
				}
			}
			else
			{
				$aResult[] = $mItem;
			}
		}

		return $aResult;
	}

	/**
	 * @param string $sFolderName
	 * @param string $sFolderHash
	 * @param array $aIndexOrUids
	 * @param \MailSo\Cache\CacheClient $oCacher
	 * @param int $iThreadLimit = 100
	 *
	 * @return array
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function MessageListThreadsMap($sFolderName, $sFolderHash, $aIndexOrUids, $oCacher, $iThreadLimit = 100)
	{
		$iThreadLimit = \is_int($iThreadLimit) && 0 < $iThreadLimit ? $iThreadLimit : 0;

		$sSearchHash = '';
		if (0 < \MailSo\Config::$MessageListDateFilter)
		{
			$iD = \time() - 3600 * 24 * 30 * \MailSo\Config::$MessageListDateFilter;
			$iTimeFilter = \gmmktime(1, 1, 1, \gmdate('n', $iD), 1, \gmdate('Y', $iD));

			$sSearchHash .= ' SINCE '.\gmdate('j-M-Y', $iTimeFilter);
		}

		if ('' === \trim($sSearchHash))
		{
			$sSearchHash = 'ALL';
		}

		if ($oCacher && $oCacher->IsInited())
		{
			$sSerializedHash =
				'ThreadsMapSorted/'.$sSearchHash.'/'.
				'Limit='.$iThreadLimit.'/'.
				$this->oImapClient->GetLogginedUser().'@'.
				$this->oImapClient->GetConnectedHost().':'.
				$this->oImapClient->GetConnectedPort().'/'.
				$sFolderName.'/'.$sFolderHash;

			$sSerializedUids = $oCacher->Get($sSerializedHash);
			if (!empty($sSerializedUids))
			{
				$aSerializedUids = @\unserialize($sSerializedUids);
				if (is_array($aSerializedUids))
				{
					if ($this->oLogger)
					{
						$this->oLogger->Write('Get Serialized Thread UIDS from cache ("'.$sFolderName.'" / '.$sSearchHash.') [count:'.\count($aSerializedUids).']');
					}

					return $aSerializedUids;
				}
			}
		}

		$this->oImapClient->FolderExamine($sFolderName);

		$aThreadUids = array();
		try
		{
			$aThreadUids = $this->oImapClient->MessageSimpleThread($sSearchHash);
		}
		catch (\MailSo\Imap\Exceptions\RuntimeException $oException)
		{
			$aThreadUids = array();
		}

		$aResult = array();
		$aCompiledThreads = $this->compileThreadArray($aThreadUids);

		foreach ($aCompiledThreads as $mData)
		{
			if (\is_array($mData))
			{
				foreach ($mData as $mSubData)
				{
					$aResult[(int) $mSubData] =
						\array_diff($mData, array((int) $mSubData));
				}
			}
			else if (\is_int($mData) || \is_string($mData))
			{
				$aResult[(int) $mData] = (int) $mData;
			}
		}

		$aParentsMap = array();
		foreach ($aIndexOrUids as $iUid)
		{
			if (isset($aResult[$iUid]) && \is_array($aResult[$iUid]))
			{
				foreach ($aResult[$iUid] as $iTempUid)
				{
					$aParentsMap[$iTempUid] = $iUid;
					if (isset($aResult[$iTempUid]))
					{
						unset($aResult[$iTempUid]);
					}
				}
			}
		}

		$aSortedThreads = array();
		foreach ($aIndexOrUids as $iUid)
		{
			if (isset($aResult[$iUid]))
			{
				$aSortedThreads[$iUid] = $iUid;
			}
		}

		foreach ($aIndexOrUids as $iUid)
		{
			if (!isset($aSortedThreads[$iUid]) &&
				isset($aParentsMap[$iUid]) &&
				isset($aSortedThreads[$aParentsMap[$iUid]]))
			{
				if (!\is_array($aSortedThreads[$aParentsMap[$iUid]]))
				{
					$aSortedThreads[$aParentsMap[$iUid]] = array();
				}

				$aSortedThreads[$aParentsMap[$iUid]][] = $iUid;
			}
		}

		$aResult = $aSortedThreads;
		unset($aParentsMap, $aSortedThreads);

		$aTemp = array();
		foreach ($aResult as $iUid => $mValue)
		{
			if (0 < $iThreadLimit && \is_array($mValue) && $iThreadLimit < \count($mValue))
			{
				$aParts = \array_chunk($mValue, $iThreadLimit);
				if (0 < count($aParts))
				{
					foreach ($aParts as $iIndex => $aItem)
					{
						if (0 === $iIndex)
						{
							$aResult[$iUid] = $aItem;
						}
						else if (0 < $iIndex && \is_array($aItem))
						{
							$mFirst = \array_shift($aItem);
							if (!empty($mFirst))
							{
								$aTemp[$mFirst] = 0 < \count($aItem) ? $aItem : $mFirst;
							}
						}
					}
				}
			}
		}

		foreach ($aTemp as $iUid => $mValue)
		{
			$aResult[$iUid] = $mValue;
		}

		unset($aTemp);

		$aLastResult = array();
		foreach ($aIndexOrUids as $iUid)
		{
			if (isset($aResult[$iUid]))
			{
				$aLastResult[$iUid] = $aResult[$iUid];
			}
		}

		$aResult = $aLastResult;
		unset($aLastResult);

		if ($oCacher && $oCacher->IsInited() && !empty($sSerializedHash))
		{
			$oCacher->Set($sSerializedHash, serialize($aResult));

			if ($this->oLogger)
			{
				$this->oLogger->Write('Save Serialized Thread UIDS to cache ("'.$sFolderName.'" / '.$sSearchHash.') [count:'.\count($aResult).']');
			}
		}

		return $aResult;
	}

	/**
	 * @param \MailSo\Mail\MessageCollection &$oMessageCollection
	 * @param array $aRequestIndexOrUids
	 * @param bool $bIndexAsUid
	 *
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function MessageListByRequestIndexOrUids(&$oMessageCollection, $aRequestIndexOrUids, $bIndexAsUid)
	{
		if (\is_array($aRequestIndexOrUids) && 0 < \count($aRequestIndexOrUids))
		{
			$aFetchResponse = $this->oImapClient->Fetch(array(
				\MailSo\Imap\Enumerations\FetchType::INDEX,
				\MailSo\Imap\Enumerations\FetchType::UID,
				\MailSo\Imap\Enumerations\FetchType::RFC822_SIZE,
				\MailSo\Imap\Enumerations\FetchType::INTERNALDATE,
				\MailSo\Imap\Enumerations\FetchType::FLAGS,
				\MailSo\Imap\Enumerations\FetchType::BODYSTRUCTURE,
				$this->getEnvelopeOrHeadersRequestString()
			), \MailSo\Base\Utils::PrepearFetchSequence($aRequestIndexOrUids), $bIndexAsUid);

			if (\is_array($aFetchResponse) && 0 < \count($aFetchResponse))
			{
				$aFetchIndexArray = array();
				$oFetchResponseItem = null;
				foreach ($aFetchResponse as /* @var $oFetchResponseItem \MailSo\Imap\FetchResponse */ &$oFetchResponseItem)
				{
					$aFetchIndexArray[($bIndexAsUid)
						? $oFetchResponseItem->GetFetchValue(\MailSo\Imap\Enumerations\FetchType::UID)
						: $oFetchResponseItem->GetFetchValue(\MailSo\Imap\Enumerations\FetchType::INDEX)] =& $oFetchResponseItem;

					unset($oFetchResponseItem);
				}

				foreach ($aRequestIndexOrUids as $iFUid)
				{
					if (isset($aFetchIndexArray[$iFUid]))
					{
						$oMessageCollection->Add(
							Message::NewFetchResponseInstance(
								$oMessageCollection->FolderName, $aFetchIndexArray[$iFUid]));
					}
				}
			}
		}
	}

	/**
	 * @return bool
	 *
	 * @throws \MailSo\Net\Exceptions\Exception
	 */
	public function IsThreadsSupported()
	{
		return $this->oImapClient->IsSupported('THREAD=REFS') ||
			$this->oImapClient->IsSupported('THREAD=REFERENCES') ||
			$this->oImapClient->IsSupported('THREAD=ORDEREDSUBJECT');
	}

	/**
	 * @param string $sSearch
	 * @param string $sFolderName
	 * @param string|bool $sFolderHash
	 * @param bool $bUseSortIfSupported = true
	 * @param bool $bUseESearchOrESortRequest = false
	 * @param \MailSo\Cache\CacheClient|null $oCacher = null
	 *
	 * @return Array|bool
	 */
	private function getSearchUidsResult($sSearch, $sFolderName, $sFolderHash,
		$bUseSortIfSupported = true, $bUseESearchOrESortRequest = false, $oCacher = null)
	{
		$bUidsFromCacher = false;
		$aResultUids = false;
		$bUseCacheAfterSearch = true;
		$sSerializedHash = '';

		$bESortSupported = $bUseSortIfSupported && $bUseESearchOrESortRequest ? $this->oImapClient->IsSupported('ESORT') : false;
		$bESearchSupported = $bUseESearchOrESortRequest ? $this->oImapClient->IsSupported('ESEARCH') : false;
		$bUseSortIfSupported = $bUseSortIfSupported ? $this->oImapClient->IsSupported('SORT') : false;

		$sSearchCriterias = $this->getImapSearchCriterias($sSearch, 0, $bUseCacheAfterSearch);
		if ($bUseCacheAfterSearch && $oCacher && $oCacher->IsInited())
		{
			$sSerializedHash =
				($bUseSortIfSupported ? 'S': 'N').'/'.
				$this->oImapClient->GetLogginedUser().'@'.
				$this->oImapClient->GetConnectedHost().':'.
				$this->oImapClient->GetConnectedPort().'/'.
				$sFolderName.'/'.
				$sSearchCriterias;

			$sSerializedLog = '"'.$sFolderName.'" / '.$sSearchCriterias.'';

			$sSerialized = $oCacher->Get($sSerializedHash);
			if (!empty($sSerialized))
			{
				$aSerialized = @\unserialize($sSerialized);
				if (\is_array($aSerialized) && isset($aSerialized['FolderHash'], $aSerialized['Uids']) &&
					\is_array($aSerialized['Uids']) &&
					($sFolderHash === $aSerialized['FolderHash']))
				{
					if ($this->oLogger)
					{
						$this->oLogger->Write('Get Serialized UIDS from cache ('.$sSerializedLog.') [count:'.\count($aSerialized['Uids']).']');
					}

					$aResultUids = $aSerialized['Uids'];
					$bUidsFromCacher = true;
				}
			}
		}

		if (!\is_array($aResultUids))
		{
			if ($bUseSortIfSupported)
			{
				if ($bESortSupported)
				{
					$aESorthData = $this->oImapClient->MessageSimpleESort(array('ARRIVAL'), $sSearchCriterias, array('ALL'), true, '');
					if (isset($aESorthData['ALL']))
					{
						$aResultUids = \MailSo\Base\Utils::ParseFetchSequence($aESorthData['ALL']);
						$aResultUids = \array_reverse($aResultUids);
					}

					unset($aESorthData);
				}
				else
				{
					$aResultUids = $this->oImapClient->MessageSimpleSort(array('REVERSE ARRIVAL'), $sSearchCriterias, true);
				}
			}
			else
			{
				if (!\MailSo\Base\Utils::IsAscii($sSearch))
				{
					try
					{
						if ($bESearchSupported)
						{
							$aESearchData = $this->oImapClient->MessageSimpleESearch($sSearchCriterias, array('ALL'), true, '', 'UTF-8');
							if (isset($aESearchData['ALL']))
							{
								$aResultUids = \MailSo\Base\Utils::ParseFetchSequence($aESearchData['ALL']);
								$aResultUids = \array_reverse($aResultUids);
							}
							unset($aESearchData);
						}
						else
						{
							$aResultUids = $this->oImapClient->MessageSimpleSearch($sSearchCriterias, true, 'UTF-8');
						}
					}
					catch (\MailSo\Imap\Exceptions\NegativeResponseException $oException)
					{
						$oException = null;
						$aResultUids = false;
					}
				}

				if (false === $aResultUids)
				{
					if ($bESearchSupported)
					{
						$aESearchData = $this->oImapClient->MessageSimpleESearch($sSearchCriterias, array('ALL'), true);
						if (isset($aESearchData['ALL']))
						{
							$aResultUids = \MailSo\Base\Utils::ParseFetchSequence($aESearchData['ALL']);
							$aResultUids = \array_reverse($aResultUids);
						}

						unset($aESearchData);
					}
					else
					{
						$aResultUids = $this->oImapClient->MessageSimpleSearch($sSearchCriterias, true);
					}
				}
			}

			if (!$bUidsFromCacher && $bUseCacheAfterSearch && \is_array($aResultUids) && $oCacher && $oCacher->IsInited() && 0 < \strlen($sSerializedHash))
			{
				$oCacher->Set($sSerializedHash, \serialize(array(
					'FolderHash' => $sFolderHash,
					'Uids' => $aResultUids
				)));

				if ($this->oLogger)
				{
					$this->oLogger->Write('Save Serialized UIDS to cache ('.$sSerializedLog.') [count:'.\count($aResultUids).']');
				}
			}
		}

		return $aResultUids;
	}

	/**
	 * @param string $sFolderName
	 * @param int $iOffset = 0
	 * @param int $iLimit = 10
	 * @param string $sSearch = ''
	 * @param string $sPrevUidNext = ''
	 * @param \MailSo\Cache\CacheClient|null $oCacher = null
	 * @param bool $bUseSortIfSupported = false
	 * @param bool $bUseThreadSortIfSupported = false
	 * @param array $aExpandedThreadsUids = array()
	 * @param bool $bUseESearchOrESortRequest = false
	 *
	 * @return \MailSo\Mail\MessageCollection
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Net\Exceptions\Exception
	 * @throws \MailSo\Imap\Exceptions\Exception
	 */
	public function MessageList($sFolderName, $iOffset = 0, $iLimit = 10, $sSearch = '', $sPrevUidNext = '',
		$oCacher = null, $bUseSortIfSupported = false, $bUseThreadSortIfSupported = false,
		$aExpandedThreadsUids = array(), $bUseESearchOrESortRequest = false)
	{
		$sSearch = \trim($sSearch);
		if (!\MailSo\Base\Validator::RangeInt($iOffset, 0) ||
			!\MailSo\Base\Validator::RangeInt($iLimit, 0, 999))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$this->oImapClient->FolderSelect($sFolderName);

		$oMessageCollection = MessageCollection::NewInstance();
		$oMessageCollection->FolderName = $sFolderName;
		$oMessageCollection->Offset = $iOffset;
		$oMessageCollection->Limit = $iLimit;
		$oMessageCollection->Search = $sSearch;

		$aLastCollapsedThreadUids = array();

		$aThreads = array();

		$iMessageCount = 0;
		$iMessageRealCount = 0;
		$iMessageUnseenCount = 0;
		$sUidNext = '0';

		$bUseSortIfSupported = $bUseSortIfSupported ? $this->oImapClient->IsSupported('SORT') : false;

		$bUseThreadSortIfSupported = $bUseThreadSortIfSupported ?
			($this->oImapClient->IsSupported('THREAD=REFS') || $this->oImapClient->IsSupported('THREAD=REFERENCES') || $this->oImapClient->IsSupported('THREAD=ORDEREDSUBJECT')) : false;

		if (!$oCacher || !($oCacher instanceof \MailSo\Cache\CacheClient))
		{
			$oCacher = null;
		}

		$this->initFolderValues($sFolderName, $iMessageRealCount, $iMessageUnseenCount, $sUidNext);
		$iMessageCount = $iMessageRealCount;

		$oMessageCollection->FolderHash = self::GenerateHash($sFolderName, $iMessageRealCount, $iMessageUnseenCount, $sUidNext);
		$oMessageCollection->UidNext = $sUidNext;
		$oMessageCollection->NewMessages = $this->getFolderNextMessageInformation($sFolderName, $sPrevUidNext, $sUidNext);

		$bSearch = false;
		$bMessageListOptimization = 0 < \MailSo\Config::$MessageListCountLimitTrigger &&
			\MailSo\Config::$MessageListCountLimitTrigger < $iMessageRealCount;

		if ($bMessageListOptimization)
		{
			$bUseSortIfSupported = false;
			$bUseThreadSortIfSupported = false;
			$bUseESearchOrESortRequest = false;
		}

		if (0 < $iMessageRealCount)
		{
			$bIndexAsUid = false;
			$aIndexOrUids = array();

			if (0 < \strlen($sSearch))
			{
				$aIndexOrUids = $this->getSearchUidsResult($sSearch,
					$oMessageCollection->FolderName, $oMessageCollection->FolderHash,
					$bUseSortIfSupported, $bUseESearchOrESortRequest, $oCacher);

				$bIndexAsUid = true;
			}
			else
			{
				if ($bUseThreadSortIfSupported && 1 < $iMessageCount)
				{
					$aIndexOrUids = $this->getSearchUidsResult('',
						$oMessageCollection->FolderName, $oMessageCollection->FolderHash,
						$bUseSortIfSupported, $bUseESearchOrESortRequest, $oCacher);

					$aThreads = $this->MessageListThreadsMap($oMessageCollection->FolderName, $oMessageCollection->FolderHash, $aIndexOrUids,
						$oCacher, \MailSo\Config::$LargeThreadLimit);

					$aExpandedThreadsUids = \is_array($aExpandedThreadsUids) ? $aExpandedThreadsUids : array();
					$bWatchExpanded = 0 < \count($aExpandedThreadsUids);

					$aNewIndexOrUids = array();
					foreach ($aIndexOrUids as $iUid)
					{
						if (isset($aThreads[$iUid]))
						{
							$aNewIndexOrUids[] = $iUid;
							if (\is_array($aThreads[$iUid]))
							{
								if ($bWatchExpanded && \in_array($iUid, $aExpandedThreadsUids))
								{
									$aSubArray = $aThreads[$iUid];
									foreach ($aSubArray as $iSubRootUid)
									{
										$aNewIndexOrUids[] = $iSubRootUid;
									}
								}
								else
								{
									$aLastCollapsedThreadUids[] = $iUid;
								}
							}
						}
					}

					$aIndexOrUids = $aNewIndexOrUids;
					unset($aNewIndexOrUids);

					$iMessageCount = \count($aIndexOrUids);
					$bIndexAsUid = true;
				}
				else
				{
					$aIndexOrUids = array(1);
					$bIndexAsUid = false;

					if (1 < $iMessageCount)
					{
						if (0 === \MailSo\Config::$MessageListDateFilter &&
							($bMessageListOptimization || !$bUseSortIfSupported))
						{
							$aIndexOrUids = \array_reverse(\range(1, $iMessageCount));
						}
						else
						{
							$aIndexOrUids = $this->getSearchUidsResult('',
								$oMessageCollection->FolderName, $oMessageCollection->FolderHash,
								$bUseSortIfSupported, $bUseESearchOrESortRequest, $oCacher);

							$bIndexAsUid = true;
						}
					}
				}
			}

			if (\is_array($aIndexOrUids))
			{
				$oMessageCollection->MessageCount = $iMessageRealCount;
				$oMessageCollection->MessageUnseenCount = $iMessageUnseenCount;
				$oMessageCollection->MessageResultCount = 0 === \strlen($sSearch)
					? $iMessageCount : \count($aIndexOrUids);

				if (0 < \count($aIndexOrUids))
				{
					$iOffset = (0 > $iOffset) ? 0 : $iOffset;
					$aRequestIndexOrUids = \array_slice($aIndexOrUids, $iOffset, $iLimit);

					$this->MessageListByRequestIndexOrUids($oMessageCollection, $aRequestIndexOrUids, $bIndexAsUid);
				}
			}
		}

		$aLastCollapsedThreadUidsForPage = array();

		if (!$bSearch && $bUseThreadSortIfSupported && 0 < \count($aThreads))
		{
			$oMessageCollection->ForeachList(function (/* @var $oMessage \MailSo\Mail\Message */ $oMessage) use (
				$aThreads, $aLastCollapsedThreadUids, &$aLastCollapsedThreadUidsForPage)
			{
				$iUid = $oMessage->Uid();
				if (\in_array($iUid, $aLastCollapsedThreadUids))
				{
					$aLastCollapsedThreadUidsForPage[] = $iUid;
				}

				if (isset($aThreads[$iUid]) && \is_array($aThreads[$iUid]) && 0 < \count($aThreads[$iUid]))
				{
					$oMessage->SetThreads($aThreads[$iUid]);
					$oMessage->SetThreadsLen(\count($aThreads[$iUid]));
				}
				else if (!isset($aThreads[$iUid]))
				{
					foreach ($aThreads as $iKeyUid => $mSubItem)
					{
						if (\is_array($mSubItem) && \in_array($iUid, $mSubItem))
						{
							$oMessage->SetParentThread($iKeyUid);
							$oMessage->SetThreadsLen(\count($mSubItem));
						}
					}
				}
			});

			$oMessageCollection->LastCollapsedThreadUids = $aLastCollapsedThreadUidsForPage;
		}

		return $oMessageCollection;
	}

	/**
	 * @return array|false
	 */
	public function Quota()
	{
		return $this->oImapClient->Quota();
	}

	/**
	 * @param string $sFolderName
	 * @param string $sMessageId
	 *
	 * @return int|null
	 */
	public function FindMessageUidByMessageId($sFolderName, $sMessageId)
	{
		if (0 === \strlen($sMessageId))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$this->oImapClient->FolderExamine($sFolderName);

		$aUids = $this->oImapClient->MessageSimpleSearch(
			'HEADER Message-ID '.$sMessageId, true);

		return \is_array($aUids) && 1 === \count($aUids) && \is_numeric($aUids[0]) ? (int) $aUids[0] : null;
	}

	/**
	 * @param array $aMailFoldersHelper
	 * @param int $iOptimizationLimit = 0
	 *
	 * @return array
	 */
	public function folerListOptimization($aMailFoldersHelper, $iOptimizationLimit = 0)
	{
		// optimization
		if (10 < $iOptimizationLimit && $iOptimizationLimit < \count($aMailFoldersHelper))
		{
			if ($this->oLogger)
			{
				$this->oLogger->Write('Start optimization (limit:'.$iOptimizationLimit.') for '.\count($aMailFoldersHelper).' folders');
			}

			$iForeachLimit = 1;

			$aFilteredNames = array(
				'inbox',
				'sent', 'outbox', 'sentmail',
				'drafts',
				'junk', 'spam',
				'trash', 'bin',
				'archive', 'allmail', 'all',
				'starred', 'flagged', 'important',
				'contacts', 'chats'
			);

			$aNewMailFoldersHelper = array();

			$iCountLimit = $iForeachLimit;
			foreach ($aMailFoldersHelper as $iIndex => /* @var $oImapFolder \MailSo\Mail\Folder */ $oFolder)
			{
				// normal and subscribed only
				if ($oFolder && ($oFolder->IsSubscribed() || \in_array(\strtolower($oFolder->NameRaw()), $aFilteredNames)))
				{
					$aNewMailFoldersHelper[] = $oFolder;

					$aMailFoldersHelper[$iIndex] = null;
					$iCountLimit--;
				}

				if (0 > $iCountLimit)
				{
					if ($iOptimizationLimit < \count($aNewMailFoldersHelper))
					{
						break;
					}
					else
					{
						$iCountLimit = $iForeachLimit;
					}
				}
			}

			$iCountLimit = $iForeachLimit;
			if ($iOptimizationLimit >= \count($aNewMailFoldersHelper))
			{
				// name filter
				foreach ($aMailFoldersHelper as $iIndex => /* @var $oImapFolder \MailSo\Mail\Folder */ $oFolder)
				{
					if ($oFolder && !\preg_match('/[{}\[\]]/', $oFolder->NameRaw()))
					{
						$aNewMailFoldersHelper[] = $oFolder;

						$aMailFoldersHelper[$iIndex] = null;
						$iCountLimit--;
					}

					if (0 > $iCountLimit)
					{
						if ($iOptimizationLimit < \count($aNewMailFoldersHelper))
						{
							break;
						}
						else
						{
							$iCountLimit = $iForeachLimit;
						}
					}
				}
			}

			$iCountLimit = $iForeachLimit;
			if ($iOptimizationLimit >= \count($aNewMailFoldersHelper))
			{
				// other
				foreach ($aMailFoldersHelper as $iIndex => /* @var $oImapFolder \MailSo\Mail\Folder */ $oFolder)
				{
					if ($oFolder)
					{
						$aNewMailFoldersHelper[] = $oFolder;

						$aMailFoldersHelper[$iIndex] = null;
						$iCountLimit--;
					}

					if (0 > $iCountLimit)
					{
						if ($iOptimizationLimit < \count($aNewMailFoldersHelper))
						{
							break;
						}
						else
						{
							$iCountLimit = $iForeachLimit;
						}
					}
				}
			}

			$aMailFoldersHelper = $aNewMailFoldersHelper;

			if ($this->oLogger)
			{
				$this->oLogger->Write('Result optimization: '.\count($aMailFoldersHelper).' folders');
			}
		}

		return $aMailFoldersHelper;
	}

	/**
	 * @param string $sParent = ''
	 * @param string $sListPattern = '*'
	 * @param bool $bUseListSubscribeStatus = false
	 * @param int $iOptimizationLimit = 0
	 *
	 * @return \MailSo\Mail\FolderCollection|false
	 */
	public function Folders($sParent = '', $sListPattern = '*', $bUseListSubscribeStatus = true, $iOptimizationLimit = 0)
	{
		$oFolderCollection = false;

		$aSubscribedFolders = null;
		if ($bUseListSubscribeStatus)
		{
			try
			{
				$aSubscribedFolders = $this->oImapClient->FolderSubscribeList($sParent, $sListPattern);
			}
			catch (\Exception $oException) {}
		}

		$aImapSubscribedFoldersHelper = null;
		if (\is_array($aSubscribedFolders))
		{
			$aImapSubscribedFoldersHelper = array();
			foreach ($aSubscribedFolders as /* @var $oImapFolder \MailSo\Imap\Folder */ $oImapFolder)
			{
				$aImapSubscribedFoldersHelper[] = $oImapFolder->FullNameRaw();
			}
		}

		$aFolders = $this->oImapClient->FolderList($sParent, $sListPattern);

		$bOptimized = false;
		$aMailFoldersHelper = null;

		if (\is_array($aFolders))
		{
			$aMailFoldersHelper = array();

			foreach ($aFolders as /* @var $oImapFolder \MailSo\Imap\Folder */ $oImapFolder)
			{
				$aMailFoldersHelper[] = Folder::NewInstance($oImapFolder,
					(null === $aImapSubscribedFoldersHelper || \in_array($oImapFolder->FullNameRaw(), $aImapSubscribedFoldersHelper)) ||
					$oImapFolder->IsInbox()
				);
			}

			$iCount = \count($aMailFoldersHelper);
			$aMailFoldersHelper = $this->folerListOptimization($aMailFoldersHelper, $iOptimizationLimit);

			$bOptimized = $iCount !== \count($aMailFoldersHelper);
		}

		if (\is_array($aMailFoldersHelper))
		{
			$oFolderCollection = FolderCollection::NewInstance();
			$oFolderCollection->InitByUnsortedMailFolderArray($aMailFoldersHelper);

			$oFolderCollection->Optimized = $bOptimized;
		}

		if ($oFolderCollection)
		{
			$oFolderCollection->SortByCallback(function ($oFolderA, $oFolderB) {
				$sA = \strtoupper($oFolderA->FullNameRaw());
				$sB = \strtoupper($oFolderB->FullNameRaw());
				switch (true)
				{
					case 'INBOX' === $sA:
						return -1;
					case 'INBOX' === $sB:
						return 1;
					case '[GMAIL]' === $sA:
						return -1;
					case '[GMAIL]' === $sB:
						return 1;
				}

				return \strnatcasecmp($oFolderA->FullName(), $oFolderB->FullName());
			});

			$oNamespace = $this->oImapClient->GetNamespace();
			if ($oNamespace)
			{
				$oFolderCollection->SetNamespace($oNamespace->GetPersonalNamespace());
			}

			$oFolderCollection->IsThreadsSupported = $this->IsThreadsSupported();
		}


		return $oFolderCollection;
	}

	/**
	 * @param string $sFolderNameInUtf8
	 * @param string $sFolderParentFullNameRaw = ''
	 * @param bool $bSubscribeOnCreation = true
	 * @param string $sDelimiter = ''
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 */
	public function FolderCreate($sFolderNameInUtf8, $sFolderParentFullNameRaw = '', $bSubscribeOnCreation = true, $sDelimiter = '')
	{
		if (!\MailSo\Base\Validator::NotEmptyString($sFolderNameInUtf8, true) ||
			!\is_string($sFolderParentFullNameRaw))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$sFolderNameInUtf8 = \trim($sFolderNameInUtf8);

		if (0 === \strlen($sDelimiter) || 0 < \strlen(\trim($sFolderParentFullNameRaw)))
		{
			$aFolders = $this->oImapClient->FolderList('', 0 === \strlen(\trim($sFolderParentFullNameRaw)) ? 'INBOX' : $sFolderParentFullNameRaw);
			if (!\is_array($aFolders) || !isset($aFolders[0]))
			{
				// TODO
				throw new \MailSo\Mail\Exceptions\RuntimeException(
					0 === \strlen(trim($sFolderParentFullNameRaw))
						? 'Cannot get folder delimiter'
						: 'Cannot create folder in non-existen parent folder');
			}

			$sDelimiter = $aFolders[0]->Delimiter();
			if (0 < \strlen($sDelimiter) && 0 < \strlen(\trim($sFolderParentFullNameRaw)))
			{
				$sFolderParentFullNameRaw .= $sDelimiter;
			}
		}

		$sFullNameRawToCreate = \MailSo\Base\Utils::ConvertEncoding($sFolderNameInUtf8,
			\MailSo\Base\Enumerations\Charset::UTF_8,
			\MailSo\Base\Enumerations\Charset::UTF_7_IMAP);

		if (0 < \strlen($sDelimiter) && false !== \strpos($sFullNameRawToCreate, $sDelimiter))
		{
			// TODO
			throw new \MailSo\Mail\Exceptions\RuntimeException(
				'New folder name contains delimiter');
		}

		$sFullNameRawToCreate = $sFolderParentFullNameRaw.$sFullNameRawToCreate;

		$this->oImapClient->FolderCreate($sFullNameRawToCreate);

		if ($bSubscribeOnCreation)
		{
			$this->oImapClient->FolderSubscribe($sFullNameRawToCreate);
		}

		return $this;
	}

	/**
	 * @param string $sPrevFolderFullNameRaw
	 * @param string $sNextFolderFullNameInUtf
	 * @param bool $bSubscribeOnMove = true
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 */
	public function FolderMove($sPrevFolderFullNameRaw, $sNextFolderFullNameInUtf, $bSubscribeOnMove = true)
	{
		return $this->folderModify($sPrevFolderFullNameRaw, $sNextFolderFullNameInUtf, false, $bSubscribeOnMove);
	}

	/**
	 * @param string $sPrevFolderFullNameRaw
	 * @param string $sNewTopFolderNameInUtf
	 * @param bool $bSubscribeOnRename = true
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 */
	public function FolderRename($sPrevFolderFullNameRaw, $sNewTopFolderNameInUtf, $bSubscribeOnRename = true)
	{
		return $this->folderModify($sPrevFolderFullNameRaw, $sNewTopFolderNameInUtf, true, $bSubscribeOnRename);
	}

	/**
	 * @param string $sPrevFolderFullNameRaw
	 * @param string $sNextFolderNameInUtf
	 * @param bool $bRenameOrMove
	 * @param bool $bSubscribeOnModify
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 */
	public function folderModify($sPrevFolderFullNameRaw, $sNextFolderNameInUtf, $bRenameOrMove, $bSubscribeOnModify)
	{
		if (0 === \strlen($sPrevFolderFullNameRaw) || 0 === \strlen($sNextFolderNameInUtf))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$aFolders = $this->oImapClient->FolderList('', $sPrevFolderFullNameRaw);
		if (!\is_array($aFolders) || !isset($aFolders[0]))
		{
			// TODO
			throw new \MailSo\Mail\Exceptions\RuntimeException('Cannot rename non-existen folder');
		}

		$sDelimiter = $aFolders[0]->Delimiter();
		$iLast = \strrpos($sPrevFolderFullNameRaw, $sDelimiter);

		$mSubscribeFolders = null;
		if ($bSubscribeOnModify)
		{
			$mSubscribeFolders = $this->oImapClient->FolderSubscribeList($sPrevFolderFullNameRaw, '*');
			if (\is_array($mSubscribeFolders) && 0 < count($mSubscribeFolders))
			{
				foreach ($mSubscribeFolders as /* @var $oFolder \MailSo\Imap\Folder */ $oFolder)
				{
					$this->oImapClient->FolderUnSubscribe($oFolder->FullNameRaw());
				}
			}
		}

        $sNewFolderFullNameRaw = \MailSo\Base\Utils::ConvertEncoding($sNextFolderNameInUtf,
            \MailSo\Base\Enumerations\Charset::UTF_8,
            \MailSo\Base\Enumerations\Charset::UTF_7_IMAP);

        if($bRenameOrMove)
        {
            if (0 < \strlen($sDelimiter) && false !== \strpos($sNewFolderFullNameRaw, $sDelimiter))
            {
                // TODO
                throw new \MailSo\Mail\Exceptions\RuntimeException('New folder name contains delimiter');
            }

            $sFolderParentFullNameRaw = false === $iLast ? '' : \substr($sPrevFolderFullNameRaw, 0, $iLast + 1);
            $sNewFolderFullNameRaw = $sFolderParentFullNameRaw.$sNewFolderFullNameRaw;
        }

		$this->oImapClient->FolderRename($sPrevFolderFullNameRaw, $sNewFolderFullNameRaw);

		if (\is_array($mSubscribeFolders) && 0 < count($mSubscribeFolders))
		{
			foreach ($mSubscribeFolders as /* @var $oFolder \MailSo\Imap\Folder */ $oFolder)
			{
				$sFolderFullNameRawForResubscrine = $oFolder->FullNameRaw();
				if (0 === \strpos($sFolderFullNameRawForResubscrine, $sPrevFolderFullNameRaw))
				{
					$sNewFolderFullNameRawForResubscrine = $sNewFolderFullNameRaw.
						\substr($sFolderFullNameRawForResubscrine, \strlen($sPrevFolderFullNameRaw));

					$this->oImapClient->FolderSubscribe($sNewFolderFullNameRawForResubscrine);
				}
			}
		}

		return $this;
	}

	/**
	 * @param string $sFolderFullNameRaw
	 * @param bool $bUnsubscribeOnDeletion = true
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 * @throws \MailSo\Mail\Exceptions\RuntimeException
	 */
	public function FolderDelete($sFolderFullNameRaw, $bUnsubscribeOnDeletion = true)
	{
		if (0 === \strlen($sFolderFullNameRaw) || 'INBOX' === $sFolderFullNameRaw)
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$this->oImapClient->FolderExamine($sFolderFullNameRaw);

		$aIndexOrUids = $this->oImapClient->MessageSimpleSearch('ALL');
		if (0 < \count($aIndexOrUids))
		{
			throw new \MailSo\Mail\Exceptions\NonEmptyFolder();
		}

		$this->oImapClient->FolderExamine('INBOX');

		if ($bUnsubscribeOnDeletion)
		{
			$this->oImapClient->FolderUnSubscribe($sFolderFullNameRaw);
		}

		$this->oImapClient->FolderDelete($sFolderFullNameRaw);

		return $this;
	}

	/**
	 * @param string $sFolderFullNameRaw
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 */
	public function FolderClear($sFolderFullNameRaw)
	{
		$this->oImapClient->FolderSelect($sFolderFullNameRaw);

		$oFolderInformation = $this->oImapClient->FolderCurrentInformation();
		if ($oFolderInformation && 0 < $oFolderInformation->Exists) // STATUS?
		{
			$this->oImapClient->MessageStoreFlag('1:*', false,
				array(\MailSo\Imap\Enumerations\MessageFlag::DELETED),
				\MailSo\Imap\Enumerations\StoreAction::ADD_FLAGS_SILENT
			);

			$this->oImapClient->MessageExpunge();
		}

		return $this;
	}

	/**
	 * @param string $sFolderFullNameRaw
	 * @param bool $bSubscribe
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 */
	public function FolderSubscribe($sFolderFullNameRaw, $bSubscribe)
	{
		if (0 === \strlen($sFolderFullNameRaw))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$this->oImapClient->{($bSubscribe) ? 'FolderSubscribe' : 'FolderUnSubscribe'}($sFolderFullNameRaw);

		return $this;
	}

	/**
	 * @param \MailSo\Log\Logger $oLogger
	 *
	 * @return \MailSo\Mail\MailClient
	 *
	 * @throws \MailSo\Base\Exceptions\InvalidArgumentException
	 */
	public function SetLogger($oLogger)
	{
		if (!($oLogger instanceof \MailSo\Log\Logger))
		{
			throw new \MailSo\Base\Exceptions\InvalidArgumentException();
		}

		$this->oLogger = $oLogger;
		$this->oImapClient->SetLogger($this->oLogger);

		return $this;
	}
}
