<?php
/**
 * EGroupware - Notifications
 *
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @package notifications
 * @subpackage ajaxpopup
 * @link http://www.egroupware.org
 * @author Cornelius Weiss <nelius@cwtech.de>, Christian Binder <christian@jaytraxx.de>
 * @version $Id$
 */

/**
 * Ajax methods for notifications
 */
class notifications_ajax {
	/**
	 * Appname
	 */
	const _appname = 'notifications';

	/**
	 * Mailappname
	 */
	const _mailappname = 'mail';

	/**
	 * Notification table in SQL database
	 */
	const _notification_table = 'egw_notificationpopup';

	/**
	 * Notification type
	 */
	const _type = 'base';

	/**
	 * holds account object for user to notify
	 *
	 * @var object
	 */
	private $recipient;

	/**
	 * holds config object (sitewide application config)
	 *
	 * @var object
	 */
	private $config;

	/**
	 * holds preferences array of user to notify
	 *
	 * @var array
	 */
	private $preferences;

	/**
	 * reference to global db object
	 *
	 * @var egw_db
	 */
	private $db;

	/**
	 * holds the users session data
	 *
	 * @var array
	 */
	var $session_data;

	/**
	 * holds the users session data defaults
	 *
	 * @var array
	 */
	var $session_data_defaults = array(
		'notified_mail_uids'	=> array(),
	);

	/**
	 * the xml response object
	 *
	 * @var egw_json_response
	 */
	private $response;

	/**
	 * constructor
	 *
	 */
	public function __construct() {
		$this->response = egw_json_response::get();
		$this->recipient = (object)$GLOBALS['egw']->accounts->read($GLOBALS['egw_info']['user']['account_id']);

		$this->config = (object)config::read(self::_appname);

		$prefs = new preferences($this->recipient->account_id);
		$preferences = $prefs->read();
		$this->preferences = $prefs->read();

		$this->db = $GLOBALS['egw']->db;
	}

	/**
	 * public AJAX trigger function to be called by the JavaScript client
	 *
	 * this function calls all other recurring AJAX notifications methods
	 * to have ONE single recurring AJAX call per user
	 *
	 * @return xajax response
	 */
	public function get_notifications($browserNotify = false) {
		// call a hook for notifications on new mail
		//if ($GLOBALS['egw_info']['user']['apps']['mail'])  $this->check_mailbox();
		$GLOBALS['egw']->hooks->process('check_notify');

		// update currentusers
		if ($GLOBALS['egw_info']['user']['apps']['admin'] &&
			$GLOBALS['egw_info']['user']['preferences']['common']['show_currentusers'])
		{
			$this->response->jquery('#currentusers', 'text', array((string)$GLOBALS['egw']->session->session_count()));
		}

		$this->get_egwpopup($browserNotify);
	}

	/**
	 * Let the user confirm that they have seen the message.
	 * After they've seen it, remove it from the database
	 *
	 * @param int|array $notify_id one or more notify_id's
	 */
	public function confirm_message($notify_id)
	{
		if ($notify_id)
		{
			$this->db->delete(self::_notification_table,array(
				'notify_id' => $notify_id,
				'account_id' => $this->recipient->account_id,
				'notify_type' => self::_type
			),__LINE__,__FILE__,self::_appname);
		}
	}

	/**
	 * gets all egwpopup notifications for calling user
	 *
	 * @return boolean true or false
	 */
	private function get_egwpopup($browserNotify = false) {
		$message = '';
		$rs = $this->db->select(self::_notification_table, '*', array(
				'account_id' => $this->recipient->account_id,
				'notify_type' => self::_type
			),
			__LINE__,__FILE__,false,'',self::_appname);
		if ($rs->NumRows() > 0)	{
			foreach ($rs as $notification) {
				$message = null;
				if($browserNotify)
				{
					$message = $notification['notify_message'];

					// Check for a link - doesn't work in notification
					if(strpos($message, lang('Linked entries:')))
					{
						$message = substr_replace($message, '', strpos($message, lang('Linked entries:')));
					}
					$message = preg_replace('#</?a[^>]*>#is','',$message);

					$message = 'data:text/html;charset=' . translation::charset() .';base64,'.base64_encode($message);
				}
				$this->response->apply('app.notifications.append',array($notification['notify_id'],$notification['notify_message'],$message));
			}

			switch($this->preferences[self::_appname]['egwpopup_verbosity']) {
				case 'low':
					$this->response->apply('app.notifications.bell', array('active'));
					break;
				case 'high':
					$this->response->alert(lang('EGroupware has notifications for you'));
					$this->response->apply('app.notifications.display');
					break;
				case 'medium':
				default:
					$this->response->apply('app.notifications.display');
					break;
			}
		}
		return true;
	}

	/**
	 * restores the users session data for notifications
	 *
	 * @return boolean true
	 */
	private function restore_session_data() {
		$session_data = $GLOBALS['egw']->session->appsession('session_data',self::_appname);
		if(is_array($session_data)) {
			$this->session_data = $session_data;
		} else {
			$this->session_data = $this->session_data_defaults;
		}

		return true;
	}

	/**
	 * saves the users session data for notifications
	 *
	 * @return boolean true
	 */
	private function save_session_data() {
		$GLOBALS['egw']->session->appsession('session_data',self::_appname,$this->session_data);
		return true;
	}
}