<?php
/**
 * EGroupware - Mail - interface class
 *
 * @link http://www.egroupware.org
 * @package mail
 * @author Hadi Nategh [hn@stylite.de]
 * @copyright (c) 2013 by Hadi Nategh <hn-AT-stylite.de>
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @version $Id$
 */

class mail_sieve
{
	var $public_functions = array(
		'editVacation'	=> True,
		'index'			=> True,
		'edit'			=> True,
		'editEmailNotification'=> True, // Added email notifications
	);

	var $errorStack;

	/**
	 * Current Identitiy
	 *
	 * @var String
	 */
	var $currentIdentity;

	/**
	 * user has admin right to emailadmin
	 *
	 * @var	boolean
	 */
	var $mail_admin = false;

	/**
	 * account object
	 *
	 * @var emailadmin_account
	 */
	var $account;

	/**
	 * flag to check if vacation is called from admin
	 *
	 * @var boolean
	 */
	var $is_admin_vac = false;

	/**
	 * siteConfigs
	 *
	 * @var array
	 */
	var $mailConfig = array();

	/**
	 * Constructor
	 */
	function __construct()
	{
		$this->displayCharset = translation::charset();
		$this->mail_admin = isset($GLOBALS['egw_info']['user']['apps']['emailadmin']);
		$this->mailConfig = config::read('mail');

		$acc_id = isset($_GET['acc_id']) ? (int)$_GET['acc_id'] : egw_cache::getSession(__CLASS__, 'acc_id');
		if ($acc_id > 0)
		{
			$this->account = emailadmin_account::read($acc_id);
		}

		$this->restoreSessionData();
	}

	/**
	 * Sieve rules list
	 *
	 * @param {array} $content
	 * @param {string} $msg
	 */
	function index(array $content=null,$msg=null)
	{
		if (!is_array($content))
		{
			egw_cache::setSession(__CLASS__, 'acc_id', $this->account->acc_id);
		}
		//Instantiate an etemplate_new object
		$tmpl = new etemplate_new('mail.sieve.index');

		if ($msg)
		{
			$content['msg'] = $msg;
		}

		if ($this->account->acc_sieve_enabled)
		{
			//Initializes the Grid contents
			$content['rg']= $this->get_rows();

			// Set content-menu actions
			$tmpl->set_cell_attribute('rg', 'actions',$this->get_actions());

			$sel_options = array(
				'status' => array(
					'ENABLED' => lang('Enabled'),
					'DISABLED' => lang('Disabled'),
				)
			);
		}
		else
		{
			$content['msg'] = lang('error').':'.lang('Serverside Filterrules (Sieve) are not activated').'. '.lang('Please contact your Administrator to validate if your Server supports Serverside Filterrules, and how to enable them in EGroupware for your active Account (%1) with ID:%2.',$this->currentIdentity['identity_string'],$this->mailbo->profileID);
			$content['hideIfSieveDisabled']='mail_DisplayNone';
		}
		$tmpl->exec('mail.mail_sieve.index',$content,$sel_options,array());
	}

	/**
	 * Email Notification Edit
	 *
	 *
	 * @param {array} $content
	 * @param {string} $msg
	 */
	function editEmailNotification($content=null, $msg='')
	{
		//Instantiate an etemplate_new object, representing sieve.emailNotification
		$eNotitmpl = new etemplate_new('mail.sieve.emailNotification');

		if ($this->account->acc_sieve_enabled)
		{
			$eNotification = $this->getEmailNotification();

			if (!is_array($content))
			{
				$content = $eNotification;

				if (!empty($eNotification['externalEmail']))
				{
					$content['externalEmail'] = explode(",",$eNotification['externalEmail']);
				}
			}
			else
			{
				$this->restoreSessionData();
				list($button) = @each($content['button']);
				unset ($content['button']);

				switch($button)
				{
					case 'save':
					case 'apply':
						if (isset($content['status']))
						{
							$newEmailNotification = $content;
							if (empty($this->mailConfig['prefpreventforwarding']) ||
								$this->mailConfig['prefpreventforwarding'] == 0 )
							{
								if (is_array($content['externalEmail']) && !empty($content['externalEmail']))
								{
									$newEmailNotification['externalEmail'] = implode(",",$content['externalEmail']);
								}
							}
						}
						if (isset($content['externalEmail']) && !empty($content['externalEmail']))
						{
							if (!$this->account->imapServer()->setEmailNotification($newEmailNotification))
							{
								$msg = lang("email notification update failed")."<br />";
								break;
							}
							else
							{
								$msg .= lang("email notification successfully updated!");
							}
						}
						else
						{
							$msg .= lang('email notification update failed! You need to set an email address!');
							break;
						}
						egw_framework::refresh_opener($msg, 'mail');
						if ($button === 'apply')
						{
							break;
						}

					case 'cancel':
						egw_framework::window_close();
						common::egw_exit();
				}
				$this->saveSessionData();
			}

			$sel_options = array(
				'status' => array(
					'on' => lang('Active'),
					'off' => lang('Deactive'),
				),
				'displaySubject' => array(
					0 => lang('No'),
					1 => lang('Yes'),
				),
			);
			$content['msg'] = $msg;
		}
		else
		{
			$content['msg'] = lang('error').':'.lang('Serverside Filterrules (Sieve) are not activated').'. '.lang('Please contact your Administrator to validate if your Server supports Serverside Filterrules, and how to enable them in EGroupware for your active Account (%1) with ID:%2.',$this->currentIdentity['identity_string'],$this->mailbo->profileID);
			$content['hideIfSieveDisabled']='mail_DisplayNone';
		}
		$eNotitmpl->exec('mail.mail_sieve.editEmailNotification', $content,$sel_options);
	}

	/**
	 * Sieve rules edit
	 *
	 * @param {array} $content
	 */
	function edit ($content=null)
	{
		//Instantiate an etemplate_new object, representing sieve.edit template
		$etmpl = new etemplate_new('mail.sieve.edit');

		if (!is_array($content))
		{
			if ( $this->getRules($_GET['ruleID']) && isset($_GET['ruleID']))
			{

				$rules = $this->rulesByID;
				$content= $rules;
				switch ($rules['action'])
				{
					case 'folder':
						$content['action_folder_text'][] = translation::convert($rules['action_arg'],'utf-8','utf7-imap');

						break;
					case 'address':

						$content['action_address_text'][] = $rules['action_arg'];
						break;
					case 'reject':
						$content['action_reject_text'] = $rules['action_arg'];
				}
			}
			else // Adding new rule
			{

				$this->getRules(null);
				$newRulePriority = count($this->rules)*2+1;
				$newRules ['priority'] = $newRulePriority;
				$newRules ['status'] = 'ENABLED';
				$readonlys = array(
					'button[delete]' => 'true',
					);
				$this->rulesByID = $newRules;
				$content = $this->rulesByID;
			}
			$this->saveSessionData();
		}
		else
		{
			$this->restoreSessionData();
			list($button) = @each($content['button']);

			//$ruleID is calculated by priority from the selected rule and is an unique ID
			$ruleID = ($this->rulesByID['priority'] -1) / 2;
            $error = 0;
			switch ($button)
			{
				case 'save':
				case 'apply':
					if($content)
					{
						unset($content['button']);

						$newRule = $content;
						$newRule['priority']	= $this->rulesByID['priority'];
						$newRule['status']	= $this->rulesByID['status'];

						switch ($content['action'])
						{
							case 'folder':
								$newRule['action_arg'] = translation::convert(implode($content['action_folder_text']), 'utf7-imap', 'utf-8');
								break;
							case 'address':
								$newRule['action_arg'] = implode($content['action_address_text']);
								//error_log(__METHOD__. '() newRules_address '. array2string($newRule['action_arg']));
								break;
							case 'reject':
								$newRule['action_arg'] = $content['action_reject_text'];
						}
						unset($newRule['action_folder_text']);
						unset($newRule['action_address_text']);
						unset($newRule['action_reject_text']);

						$newRule['flg'] = 0 ;
						if( $newRule['continue'] ) { $newRule['flg'] += 1; }
						if( $newRule['gthan'] )    { $newRule['flg'] += 2; }
						if( $newRule['anyof'] )    { $newRule['flg'] += 4; }
						if( $newRule['keep'] )     { $newRule['flg'] += 8; }
						if( $newRule['regexp'] )   { $newRule['flg'] += 128; }

						if($newRule['action'] && $this->rulesByID['priority'])
						{
							$this->rules[$ruleID] = $newRule;
							$ret = $this->account->imapServer()->setRules($this->rules);
							if (!$ret && !empty($this->account->imapServer()->error))
							{
								$msg .= lang("Saving the rule failed:")."<br />".$this->account->imapServer()->error."<br />";
							}
							else
							{
								$msg .= lang("The rule with priority %1 successfully saved!",$ruleID);
							}
							$this->saveSessionData();
						}
						else
						{
							$msg .= "\n".lang("Error: Could not save rule").' '.lang("No action defined!");
							$error++;
						}
					}
					else
					{
						$msg .= "\n".lang("Error: Could not save rule").' '.lang("No action defined!");
						$error++;
					}
					egw_framework::refresh_opener($msg, 'mail', 'sieve');
					if ($button == "apply")
					{
						break;
					}
				//fall through

				case 'delete':
					if ($button == "delete")
					{
						if ($ruleID === count($this->rules)-1)
						{
							$msg = lang('rule with priority ') . $ruleID . lang(' deleted!');
						}
						else
						{

							$msg = lang('rule with priority ') . $ruleID . lang(' deleted!') . lang(' And the rule with priority %1, now got the priority %2',$ruleID+1,$ruleID);
						}
						unset($this->rules[$ruleID]);
						$this->rules = array_values($this->rules);
						$this->updateScript();
					}
					egw_framework::refresh_opener($msg, 'mail', 'sieve');

				case 'cancel':
					egw_framework::window_close();
					common::egw_exit();
			}
		}
		$sel_options = array(//array_merge($sel_options,array(
			'anyof' => array(
				0 => lang('all of'),
				1 => lang('any of'),
			),
			'gthan' => array(
				0 => lang('less than'),
				1 => lang('greater than'),
			),
			'bodytransform' => array(
				0 => 'raw',
				1 => 'text',
			),
			'ctype' => emailadmin_script::$btransform_ctype_array,

		);

		//Set the preselect_options for mail/folders as we are not allow free entry for folder taglist
		$mailCompose = new mail_compose();
		$sel_options['action_folder_text'] = $mailCompose->ajax_searchFolder(0,true);

		return $etmpl->exec('mail.mail_sieve.edit',$content,$sel_options,$readonlys,array(),2);
	}

	/**
	 * Read email notification script from the sieve script from server
	 *
	 *
	 * @return type, returns array of email notification data, and in case of failure returns false
	 * @todo Need to be checked if it is still needed
	 */
	function getEmailNotification()
	{
		if(!(empty($this->mailConfig['prefpreventnotificationformailviaemail']) || $this->mailConfig['prefpreventnotificationformailviaemail'] == 0))
		{
			throw new egw_exception_no_permission();
		}

		if(PEAR::isError($error = $this->account->imapServer()->retrieveRules()) )
		{
			$rules    = array();
			$emailNotification = array();
		}
		else
		{
			$rules    = $this->account->imapServer()->getRules();
			$emailNotification = $this->account->imapServer()->getEmailNotification();
		}

		return $emailNotification;
	}

	/**
	 * Fetch Vacation rules and predefined Addresses from mailserver
	 *
	 * @param string $accountID
	 *
	 * @return array return multi-dimentional array of vacation and aliases
	 */
	function getVacation($accountID = null)
	{
		if(!(empty($this->mailConfig['prefpreventabsentnotice']) || $this->mailConfig['prefpreventabsentnotice'] == 0))
		{
			throw new egw_exception_no_permission();
		}
		try {
			if ($this->is_admin_vac)
			{
				$icServer = $this->account->imapServer($accountID);
				$vacation = $icServer->getVacationUser($accountID);
			}
			else
			{
				$icServer = $this->account->imapServer();
				$icServer->retrieveRules(null);
				$vacation = $icServer->getVacation();
			}
		}
		catch(Exception $e)
		{
			egw_framework::window_close(lang($e->getMessage()));
		}
		if (is_null($accountID)) $accountID = $GLOBALS['egw_info']['user']['account_id'];

		$accAllIdentities = $this->account->smtpServer()->getAccountEmailAddress(accounts::id2name($accountID));
		$allAliases = array($this->account->ident_email);
		foreach ($accAllIdentities as &$arrVal)
		{
			if ($arrVal['type'] !='default')
			{
				$allAliases[] =  $arrVal['address'];
			}
		}
		asort($allAliases);
		return array(
			'vacation' =>$vacation,
			'aliases' => array_values($allAliases),
		);
	}

	/**
	 * Vacation edit
	 *
	 * @param {array} $content
	 * @param {string} $msg
	 */
	function editVacation($content=null, $msg='')
	{
		//Instantiate an etemplate_new object, representing the sieve.vacation template
		$vtmpl = new etemplate_new('mail.sieve.vacation');
		$vacation = array();

		if (isset($_GET['account_id'])) $account_id = $preserv['account_id'] = $_GET['account_id'];

		if (isset($content['account_id']))
		{
			$account_id = $content['account_id'];
			$preserv['acc_id'] = $content['acc_id'];
		}
		if(isset($account_id) && $this->mail_admin)
		{
			foreach(emailadmin_account::search($account_id, false, null, false, 0, false) as $account)
			{
				try {
					// check if account is valid for multiple users, has admin credentials and sieve enabled
					if (emailadmin_account::is_multiple($account) &&
						($icServer = $account->imapServer(true)) &&	// check on icServer object, so plugins can overwrite
						$icServer->acc_imap_admin_username && $icServer->acc_sieve_enabled)
					{
						$allAccounts[$account->acc_id] = $account->acc_name;
						$accounts[$account->acc_id] = $account;
					}
				}
				catch(Exception $e) {
					unset($e);
					// ignore broken accounts
				}
			}

			$profileID = !isset($content['acc_id']) ? key($accounts):$content['acc_id'];
			if (isset($_GET['acc_id']) && isset($allAccounts[$_GET['acc_id']]))
			{
				$profileID = $content['acc_id'] = (int)$_GET['acc_id'];
			}

			//Chooses the right account
			$this->account = $accounts[$profileID];

			$this->is_admin_vac = true;
			$preserv['account_id'] = $account_id;
		}
		elseif(!is_array($content) && isset($_GET['acc_id']))
		{
			$this->account = emailadmin_account::read($_GET['acc_id']);
			$preserv['acc_id'] = $this->account->acc_id;
		}
		elseif ($content['acc_id'])
		{
			$this->account = emailadmin_account::read($content['acc_id']);
			$preserv['acc_id'] = $content['acc_id'];
		}

		$icServer = $this->account->imapServer($this->is_admin_vac ? $account_id : false);

		if ($icServer->acc_sieve_enabled)
		{
			$vacRules = $this->getVacation($account_id);

			if ($icServer->acc_imap_administration)
			{
				$ByDate = array('by_date' => lang('By date'));
			}
			if (!is_array($content) || ($content['acc_id'] && !isset($content['button'])))
			{
				$content = $vacation = $vacRules['vacation'];
				if (!empty($profileID)) $content['acc_id'] = $profileID;
				if (empty($vacation['addresses']))
				{
					$content['addresses'] = '';
				}
				if (!empty($vacation['forwards']))
				{
					$content['forwards'] = explode(",",$vacation['forwards']);
				}
				else
				{
					$content['forwards'] = '';
				}
				if (empty($vacation['text']) && $this->mailConfig['default_vacation_text']) $content['text'] = $this->mailConfig['default_vacation_text'];
				//Set default value for days new entry
				if (empty($content['days']))
				{
					$content['days'] = '3';
				}
				$preserv['is_admin_vac'] = $content['is_admin_vac'] = $this->is_admin_vac;
			}
			else
			{
				$this->restoreSessionData();
				list($button) = @each($content['button']);
				unset ($content['button']);

				switch($button)
				{
					case 'save':
					case 'apply':
						if ($GLOBALS['egw_info']['user']['apps']['admin'])
						{
							// store text as default
							if ($content['set_as_default'] == 1)
							{
								config::save_value('default_vacation_text', $content['text'], 'mail');
							}
						}
						if (isset($content['status']))
						{
							//error_log(__METHOD__. 'content:' . array2string($content));
							$newVacation = $content;

							if (empty($this->mailConfig['prefpreventforwarding']) ||
								$this->mailConfig['prefpreventforwarding'] == 0 )
							{
								if (is_array($content['forwards']) && !empty($content['forwards']))
								{

									$newVacation['forwards'] = implode(",",$content['forwards']);
								}
								else
								{
									$newVacation ['forwards'] = '';
								}
							}
							else
							{
								unset($newVacation ['forwards']);
							}

							if (!in_array($newVacation['status'],array('on','off','by_date')))
							{
								$newVacation['status'] = 'off';
							}

							$checkAddresses = isset($content['check_mail_sent_to']) && $content['check_mail_sent_to'] != 0;
							if ($content['addresses'])
							{
								$newVacation ['addresses'] = $content['addresses'];
							}

							if($this->checkRule($newVacation,$checkAddresses))
							{
								if (isset($account_id) && $this->mail_admin)
								{
									$resSetvac = $icServer->setVacationUser($account_id, $this->scriptName, $newVacation);
								}
								else
								{
									$resSetvac = $icServer->setVacation($newVacation);
								}

								if (!$resSetvac)
								{
									$msg = lang('vacation update failed') . "\n" . lang('Vacation notice update failed') . ":" . $this->account->imapServer()->error;
									break;
								}
								// schedule job to switch message on/off, if request and not already in past
								else
								{
									if ($newVacation['status'] == 'by_date' && $newVacation['end_date']+24*3600 > time() ||
										$vacRules && $vacRules['vacation']['status'] == 'by_date')
									{
										self::setAsyncJob($newVacation);
									}
									//Reset vacationNotice cache which is used in mail_ui get_rows
									$cachedVacations = egw_cache::getCache(egw_cache::INSTANCE, 'email', 'vacationNotice'+$GLOBALS['egw_info']['user']['account_lid']);
									$cachedVacations = array($icServer->acc_id => $newVacation) + (array)$cachedVacations;
									egw_cache::setCache(egw_cache::INSTANCE,'email', 'vacationNotice'+$GLOBALS['egw_info']['user']['account_lid'], $cachedVacations);

									$msg = lang('Vacation notice sucessfully updated.');
								}
							}
							else
							{
								$msg .= implode("\n",$this->errorStack);
							}
							// refresh vacationNotice on index
							$response = egw_json_response::get();
							$response->call('app.mail.mail_callRefreshVacationNotice',$this->mailbo->profileID);
							egw_framework::refresh_opener($msg, 'mail');
							if ($button === 'apply' || $icServer->error !=="")
							{
								break;
							}
						}

					case 'cancel':
						egw_framework::window_close();
				}
			}

			$sel_options = array(
				'status' => array(
					'on' => lang('Active'),
					'off' => lang('Deactive'),
				),
				'addresses' => array_combine($vacRules['aliases'],$vacRules['aliases']),
			);
			if (!isset($account_id))
			{
				$readonlys['acc_id'] = true;
			}
			else
			{
				$sel_options['acc_id'] = $allAccounts;
			}
			if (!empty($ByDate))
			{
				$sel_options['status'] += $ByDate;
			}
			if (!isset($GLOBALS['egw_info']['user']['apps']['admin']))
			{
				$content['is_not_admin_user'] = true;
				$readonlys['set_as_default'] = true;
			}
			$content['msg'] = $msg;
		}
		else
		{
			$content['msg'] = lang('error').':'.lang('Serverside Filterrules (Sieve) are not activated').'. '.lang('Please contact your Administrator to validate if your Server supports Serverside Filterrules, and how to enable them in EGroupware for your active Account (%1) with ID:%2.',$this->currentIdentity['identity_string'],$this->mailbo->profileID);
			$content['hideIfSieveDisabled']='mail_DisplayNone';
		}
		$vtmpl->exec('mail.mail_sieve.editVacation',$content,$sel_options,$readonlys,$preserv,2);
	}

	/**
	 * set the asyncjob for a timed vacation
	 *
	 * @param array $_vacation vacation to set/unset with values for 'account_id', 'acc_id' and vacation stuff
	 * @param boolean $_reschedule do nothing but reschedule the job by 3 minutes
	 * @return  void
	 */
	static function setAsyncJob (array $_vacation, $_reschedule=false)
	{
		if (!($_vacation['acc_id'] > 0))
		{
			throw new egw_exception_wrong_parameter('No acc_id given!');
		}
		// setting up an async job to enable/disable the vacation message
		$async = new asyncservice();
		if (empty($_vacation['account_id'])) $_vacation['account_id'] = $GLOBALS['egw_info']['user']['account_id'];
		$async_id = !empty($_vacation['id']) ? $_vacation['id'] : 'mail-vacation-'.$_vacation['account_id'];
		$async->delete($async_id);

		$end_date = $_vacation['end_date'] + 24*3600;   // end-date is inclusive, so we have to add 24h
		if ($_vacation['status'] == 'by_date' && time() < $end_date && !$_reschedule)
		{
			$time = time() < $_vacation['start_date'] ? $_vacation['start_date'] : $end_date;
			$async->set_timer($time,$async_id, 'mail_sieve::async_vacation', $_vacation, $_vacation['account_id']);
		}
		if ($_reschedule)
		{
			$_vacation['rescheduled'] = $_vacation['rescheduled'] ? 2*$_vacation['rescheduled'] : 5;
			// only try to reschedule for 2 days max
			if ($_vacation['rescheduled'] <= 2 * 24 * 60)
			{
				$time = time() + 60*($_vacation['rescheduled']);
				unset($_vacation['next']);
				unset($_vacation['times']);
				$async->set_timer($time, $async_id, 'mail_sieve::async_vacation', $_vacation, $_vacation['account_id']);
			}
		}
 	}

	/**
	 * Callback for the async job to enable/disable the vacation message
	 *
	 * @param array $_vacation
	 * @throws egw_exception_not_found if mail account is not found
	 */
	static function async_vacation(array $_vacation)
	{
		//error_log(__METHOD__.'('.array2string($_vacation).')');

		$account = emailadmin_account::read($_vacation['acc_id'], $_vacation['account_id']);
		$icServer = $account->imapServer($_vacation['account_id']);

		//error_log(__METHOD__.'() imap username='.$icServer->acc_imap_username);

		try
		{
			$ret = $icServer->setVacationUser($_vacation['account_id'], null, $_vacation);
			self::setAsyncJob($_vacation);
		}
		// if mail account no longer exists --> remove async job
		catch (egw_exception_not_found $e)
		{
			$_vacation['status'] = 'off';
			self::setAsyncJob($_vacation);
		}
		catch (Exception $e) {
			error_log(__METHOD__.'('.array2string($_vacation).' failed '.$e->getMessage());
			self::setAsyncJob($_vacation, true);	// reschedule
			$ret = false;
		}

		return $ret;
	}

	/**
	 * Checking vaction validation
	 *
	 * @param {array} $_vacation
	 * @param {boolean} $_checkAddresses
	 *
	 * @return boolean
	 */
	function checkRule($_vacation,$_checkAddresses=true)
	{
		$this->errorStack = array();

		if (!$_vacation['text'])
		{
			$this->errorStack['text'] = lang('Please supply the message to send with auto-responses').'!	';
		}

		if (!$_vacation['days'])
		{
			$this->errorStack['days'] = lang('Please select the number of days to wait between responses').'!';
		}

		if(is_array($_vacation['addresses']) && !empty($_vacation['addresses']))
		{
			$regexp="/^[a-z0-9]+([_\\.-][a-z0-9]+)*@([a-z0-9]+([\.-][a-z0-9]+)*)+\\.[a-z]{2,}$/i";
			foreach ($_vacation['addresses'] as $addr)
			{
				if (!preg_match($regexp,$addr) && $_checkAddresses)
				{
					$this->errorStack['addresses'] = lang('One address is not valid').'!';
				}
			}
		}
		else
		{
			$this->errorStack['addresses'] = lang('Please select a address').'!';
		}
		if ($_vacation['status'] == 'by_date')
		{
			if (!$_vacation['start_date'] || !$_vacation['end_date'])
			{
				$this->errorStack['status'] = lang('Activating by date requires a start- AND end-date!');
			}
			elseif($_vacation['start_date'] > $_vacation['end_date'])
			{
				$this->errorStack['status'] = lang('Vacation start-date must be BEFORE the end-date!');
			}
		}
		if ($_vacation['forwards'])
		{
			foreach(preg_split('/, ?/',$_vacation['forwards']) as $addr)
			{
				if (!preg_match($regexp,$addr) && $_checkAddresses)
				{
					$this->errorStack['forwards'] = lang('One address is not valid'.'!');
				}
			}
		}
		//error_log(__METHOD__. array2string($this->errorStack));
		if(count($this->errorStack) == 0)
		{
			return true;
		}
		else
		{
			$this->errorStack['message'] = lang('Vacation notice is not saved yet! (But we filled in some defaults to cover some of the above errors. Please correct and check your settings and save again.)');
			return false;
		}
	}

	/**
	 * Move rule to an other position in list
	 *
	 * @param {array} $orders
	 */
	function ajax_moveRule($orders)
	{

		foreach ($orders as $keys => $val)
		{
			$orders[$keys] = $val -1;
		}

		$this->getRules(null);

		$newrules = $this->rules;

		foreach($orders as $keys => $ruleID)
		{
			$newrules[$keys] = $this->rules[$ruleID];
		}

		$this->rules = $newrules;
		$this->updateScript();
		$this->saveSessionData();

		//Calling to referesh after move action
		$response = egw_json_response::get();
		$response->call('app.mail.sieve_refresh');
	}

	/**
	 * Ajax function to handle actions over sieve rules list on gd
	 *
	 * @param string $action name of action
	 * @param string $checked the selected rule id
	 * @param string $msg containing the message comming from the client-side
	 *
	 */
	function ajax_action($action, $checked, $msg)
	{
		$this->getRules(null);

		switch ($action)
		{
			case 'delete':
				if ($checked === count($this->rules)-1)
				{
					$msg = lang('rule with priority ') . $checked . lang(' deleted!');
				}
				else
				{

					$msg = lang('rule with priority ') . $checked . lang(' deleted!') . lang(' And the rule with priority %1, now got the priority %2',$checked+1,$checked);
				}
				unset($this->rules[$checked]);
				$this->rules = array_values($this->rules);
				break;
			case 'enable':
				$msg = lang('rule with priority ') . $checked . lang(' enabled!');
				$this->rules[$checked][status] = 'ENABLED';
				break;
			case 'disable':
				$msg = lang('rule with priority ') . $checked . lang(' disabled!');
				$this->rules[$checked][status] = 'DISABLED';
				break;
			case 'move':
				break;
		}

		ob_start();
		$result = $this->updateScript();

		$response = egw_json_response::get();

		if($result)
		{
			$response->error($result);
			return;
		}
		$this->saveSessionData();

		$response->call('app.mail.sieve_refresh');
	}

	/**
	 * Convert an script seive format rule to human readable format
	 *
	 * @param {array} $rule Array of rules
	 * @return {string}  return the rule as a string.
	 */
	function buildRule($rule)
	{
		$andor = ' '. lang('and') .' ';
		$started = 0;
		if ($rule['anyof'])
		{
			$andor = ' '. lang('or') .' ';
		}
		$complete = lang('IF').' ';
		if ($rule['unconditional'])
		{
			$complete = "[Unconditional] ";
		}
		if ($rule['from'])
		{
			$match = $this->setMatchType($rule['from'],$rule['regexp']);
			$complete .= "'From:' " . $match . " '" . $rule['from'] . "'";
			$started = 1;
		}
		if ($rule['to'])
		{
			if ($started)
			{
				$complete .= $andor;
			}
			$match = $this->setMatchType($rule['to'],$rule['regexp']);
			$complete .= "'To:' " . $match . " '" . $rule['to'] . "'";
			$started = 1;
		}
		if ($rule['subject'])
		{
			if ($started)
			{
				$complete .= $andor;
			}
			$match = $this->setMatchType($rule['subject'],$rule['regexp']);
			$complete .= "'Subject:' " . $match . " '" . $rule['subject'] . "'";
			$started = 1;
		}
		if ($rule['field'] && $rule['field_val'])
		{
			if ($started)
			{
				$complete .= $andor;
			}
			$match = $this->setMatchType($rule['field_val'],$rule['regexp']);
			$complete .= "'" . $rule['field'] . "' " . $match . " '" . $rule['field_val'] . "'";
			$started = 1;
		}
		if ($rule['size'])
		{
			$xthan = " less than '";
			if ($rule['gthan'])
			{
				$xthan = " greater than '";
			}
			if ($started)
			{
				$complete .= $andor;
			}
			$complete .= "message " . $xthan . $rule['size'] . "KB'";
			$started = 1;
		}
		if (!empty($rule['field_bodytransform']))
		{
			if ($started)
			{
				$newruletext .= ", ";
			}
			$btransform	= " :raw ";
			$match = ' :contains';
			if ($rule['bodytransform'])
			{
				$btransform = " :text ";
			}
			if (preg_match("/\*|\?/", $rule['field_bodytransform']))
			{
				$match = ':matches';
			}
			if ($rule['regexp'])
			{
				$match = ':regex';
			}
			$complete .= " body " . $btransform . $match . " \"" . $rule['field_bodytransform'] . "\"";
			$started = 1;

		}
		if ($rule['ctype']!= '0' && !empty($rule['ctype']))
		{
			if ($started)
			{
				$newruletext .= ", ";
			}
			$btransform_ctype = emailadmin_script::$btransform_ctype_array[$rule['ctype']];
			$ctype_subtype = "";
			if ($rule['field_ctype_val'])
			{
				$ctype_subtype = "/";
			}
			$complete .= " body :content " . " \"" . $btransform_ctype . $ctype_subtype . $rule['field_ctype_val'] . "\"" . " :contains \"\"";
			$started = 1;
			//error_log(__CLASS__."::".__METHOD__.array2string(emailadmin_script::$btransform_ctype_array));
		}
		if (!$rule['unconditional'])
		{
			$complete .= ' '.lang('THEN').' ';
		}
		if (preg_match("/folder/i",$rule['action']))
		{
			$complete .= lang('file into')." '" . $rule['action_arg'] . "';";
		}
		if (preg_match("/reject/i",$rule['action']))
		{
			$complete .= lang('reject with')." '" . $rule['action_arg'] . "'.";
		}
		if (preg_match("/address/i",$rule['action']))
		{
			$complete .= lang('forward to').' ' . $rule['action_arg'] .'.';
		}
		if (preg_match("/discard/i",$rule['action']))
		{
			$complete .= lang('discard').'.';
		}
		if ($rule['continue'])
		{
			$complete .= " [Continue]";
		}
		if ($rule['keep'])
		{
			$complete .= " [Keep a copy]";
		}
		return $complete;
	}

	/**
	 * Helper function to find the type of content
	 *
	 * @param {string} $matchstr string that should be compared
	 * @param {string} $regex regular expresion as pattern to be matched
	 * @return {string} return the type
	 */
	function setMatchType (&$matchstr, $regex = false)
	{
		$match = lang('contains');
		if (preg_match("/^\s*!/", $matchstr))
		{
			$match = lang('does not contain');
		}
		if (preg_match("/\*|\?/", $matchstr))
		{
			$match = lang('matches');
			if (preg_match("/^\s*!/", $matchstr))
			{
				$match = lang('does not match');
			}
		}
		if ($regex)
		{
			$match = lang('matches regexp');
			if (preg_match("/^\s*!/", $matchstr))
			{
				$match = lang('does not match regexp');
			}
		}
		if ($regex && preg_match("/^\s*\\\\!/", $matchstr))
		{
			$matchstr = preg_replace("/^\s*\\\\!/","!",$matchstr);
		}
		else
		{
			$matchstr = preg_replace("/^\s*!/","",$matchstr);
		}
		return $match;
	}

	/**
	 * Save session data
	 */
	function saveSessionData()
	{
		$sessionData['sieve_rules']		= $this->rules;
		$sessionData['sieve_rulesByID'] = $this->rulesByID;
		$sessionData['sieve_scriptToEdit']	= $this->scriptToEdit;
		$GLOBALS['egw']->session->appsession('sieve_session_data','',$sessionData);
	}

	/**
	 * Update the sieve script on mail server
	 */
	function updateScript()
	{
		if (!$this->account->imapServer()->setRules($this->rules))
		{
			return "update failed";
		}
	}

	/**
	 * Fetched rules save on array()rules.
	 *
	 * @param {string} $ruleID  Numeric Id of the rule if specify return the specitic rule| otherwise ruleByID would be null
	 *
	 * @return {boolean} returns false in case of failure and true in case of success.
	 */
	function getRules($ruleID = null)
	{
		if(PEAR::isError($error = $this->account->imapServer()->retrieveRules()) )
		{
			error_log(__METHOD__.__LINE__.$error->message);
			$this->rules	= array();
			$this->rulesByID = array();
			$this->vacation	= array();
		}
		else
		{
			$this->rules	= $this->account->imapServer()->getRules();
			$this->rulesByID = $this->rules[$ruleID];
			$this->vacation	= $this->account->imapServer()->getVacation();
		}
		return true;
	}

	/**
	 * Restore session data
	 */
	function restoreSessionData()
	{
		$sessionData = $GLOBALS['egw']->session->appsession('sieve_session_data');
		$this->rules		= $sessionData['sieve_rules'];
		$this->rulesByID = $sessionData['sieve_rulesByID'];
		$this->scriptToEdit	= $sessionData['sieve_scriptToEdit'];
	}

	/**
	 *
	 * Get the data for iterating the rows on rules list grid
 	 *
	 * @return {boolean|array} Array of rows | false if failed
	 */
	function get_rows()
	{
		$rows = array();
		$this->getRules(null);

		if (is_array($this->rules) && !empty($this->rules) )
		{
			$rows = $this->rules;

			foreach ($rows as &$row )
			{
				$row['rules'] = $this->buildRule($row);
				$row['ruleID'] =(string)(($row['priority'] -1) / 2 );
				if ($row ['status'] === 'DISABLED')
				{
					$row['class'] = 'mail_sieve_DISABLED';
				}
            }
		}
		else
		{
			//error_log(__METHOD__.'There are no rules or something is went wrong at getRules()!');
			return false;
		}
		// Shift one down, because in grid the first row is reserved for header
		array_unshift($rows,array(''=> ''));
		return $rows;
	}

	/**
	 * Get actions / context menu for index
	 *
	 * @return {array} returns defined actions as an array
	 */
	private function get_actions()
	{
		$actions =array(

			'edit' => array(
				'caption' => 'Edit',
				'default' => true,
				'onExecute' => 'javaScript:app.mail.action',
                'disableClass' => 'th'
			),
			'add' => array(
				'caption' => 'Add',
				'onExecute' => 'javaScript:app.mail.action'
			),
			'enable' => array(
				'caption' => 'Enable',
				'onExecute' => 'javaScript:app.mail.action',
				'enableClass' => 'mail_sieve_DISABLED',
                'hideOnDisabled' => true
			),
			'disable' => array(
				'caption' => 'Disable',
				'onExecute' => 'javaScript:app.mail.action',
				'disableClass' => 'mail_sieve_DISABLED',
                'hideOnDisabled' => true
			),
			'delete' => array(
				'caption' => 'Delete',
				'onExecute' => 'javaScript:app.mail.action'
			),

		);
		return $actions;
	}
}