<?php
/*
 * Copyright 2005 - 2009  Zarafa B.V.
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3, 
 * as published by the Free Software Foundation with the following additional 
 * term according to sec. 7:
 *  
 * According to sec. 7 of the GNU Affero General Public License, version
 * 3, the terms of the AGPL are supplemented with the following terms:
 * 
 * "Zarafa" is a registered trademark of Zarafa B.V. The licensing of
 * the Program under the AGPL does not imply a trademark license.
 * Therefore any rights, title and interest in our trademarks remain
 * entirely with us.
 * 
 * However, if you propagate an unmodified version of the Program you are
 * allowed to use the term "Zarafa" to indicate that you distribute the
 * Program. Furthermore you may use our trademarks where it is necessary
 * to indicate the intended purpose of a product or service provided you
 * use it in accordance with honest practices in industrial or commercial
 * matters.  If you want to propagate modified versions of the Program
 * under the name "Zarafa" or "Zarafa Server", you may only do so if you
 * have a written permission by Zarafa B.V. (to acquire a permission
 * please contact Zarafa at trademark@zarafa.com).
 * 
 * The interactive user interface of the software displays an attribution
 * notice containing the term "Zarafa" and/or the logo of Zarafa.
 * Interactive user interfaces of unmodified and modified versions must
 * display Appropriate Legal Notices according to sec. 5 of the GNU
 * Affero General Public License, version 3, when you propagate
 * unmodified or modified versions of the Program. In accordance with
 * sec. 7 b) of the GNU Affero General Public License, version 3, these
 * Appropriate Legal Notices must retain the logo of Zarafa or display
 * the words "Initial Development by Zarafa" if the display of the logo
 * is not reasonably feasible for technical reasons. The use of the logo
 * of Zarafa in Legal Notices is allowed for unmodified and modified
 * versions of the software.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *  
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */

?>
<?
	/*
	* In general
	*
	* This class never actually modifies a task item unless we receive a task request update. This means
	* that setting all the properties to make the task item itself behave like a task request is up to the 
	* caller.
	*
	* The only exception to this is the generation of the TaskGlobalObjId, the unique identifier identifying
	* this task request to both the organizer and the assignee. The globalobjectid is generated when the
	* task request is sent via sendTaskRequest.
	*/

	/* The TaskMode value is only used for the IPM.TaskRequest items. It must 0 (tdmtNothing) on IPM.Task items.
	* 
	* It is used to indicate the type of change that is being carried in the IPM.TaskRequest item (although this
	* information seems redundant due to that information already being available in PR_MESSAGE_CLASS).
	*/
	define('tdmtNothing', 0);			// Value in IPM.Task items
	define('tdmtTaskReq', 1);			// Assigner -> Assignee
	define('tdmtTaskAcc', 2);			// Assignee -> Assigner
	define('tdmtTaskDec', 3);			// Assignee -> Assigner
	define('tdmtTaskUpd', 4);			// Assignee -> Assigner
	define('tdmtTaskSELF', 5);			// Assigner -> Assigner (?)

	/* The TaskHistory is used to show the last action on the task on both the assigner and the assignee's side.
	*
	* It is used in combination with 'AssignedTime' and 'tasklastdelegate' or 'tasklastuser' to show the information
	* at the top of the task request in the format 'Accepted by <user> on 01-01-2010 11:00'.
	*/
	define('thNone', 0);
	define('thAccepted', 1);			// Set by assignee
	define('thDeclined', 2);			// Set by assignee
	define('thUpdated', 3);				// Set by assignee
	define('thDueDateChanged', 4);
	define('thAssigned', 5);			// Set by assigner

	/* The TaskState value is used to differentiate the version of a task in the assigner's folder and the version in the
	* assignee's folder. The buttons shown depend on this and the 'taskaccepted' boolean (for the assignee)
	*/ 
	define('tdsNOM', 0);		// Got a response to a deleted task, and re-created the task for the assigner
	define('tdsOWNNEW', 1);		// Not assigned
	define('tdsOWN', 2);		// Assignee version
	define('tdsACC', 3);		// Assigner version
	define('tdsDEC', 4);		// Assigner version, but assignee declined

	/* The delegationstate is used for the assigner to indicate state
	*/
	define('olTaskNotDelegated', 0);
	define('olTaskDelegationUnknown', 1); // After sending req
	define('olTaskDelegationAccepted', 2); // After receiving accept
	define('olTaskDelegationDeclined', 3); // After receiving decline

	/* The task ownership indicates the role of the current user relative to the task.
	*/
	define('olNewTask', 0);
	define('olDelegatedTask', 1);	// Task has been assigned
	define('olOwnTask', 2);			// Task owned

	/* taskmultrecips indicates whether the task request sent or received has multiple assignees or not.
	*/
	define('tmrNone', 0);
	define('tmrSent', 1);		// Task has been sent to multiple assignee
	define('tmrReceived', 2);	// Task Request received has multiple assignee

	class TaskRequest {

		// All recipient properties
		var $recipprops = Array(PR_ENTRYID, PR_DISPLAY_NAME, PR_EMAIL_ADDRESS, PR_RECIPIENT_ENTRYID, PR_RECIPIENT_TYPE, PR_SEND_INTERNET_ENCODING, PR_SEND_RICH_INFO, PR_RECIPIENT_DISPLAY_NAME, PR_ADDRTYPE, PR_DISPLAY_TYPE, PR_RECIPIENT_TRACKSTATUS, PR_RECIPIENT_TRACKSTATUS_TIME, PR_RECIPIENT_FLAGS, PR_ROWID);

		/* Constructor
		 *
		 * Constructs a TaskRequest object for the specified message. This can be either the task request
		 * message itself (in the inbox) or the task in the tasks folder, depending on the action to be performed.
		 *
		 * As a general rule, the object message passed is the object 'in view' when the user performs one of the
		 * actions in this class.
		 *
		 * @param $store store MAPI Store in which $message resides. This is also the store where the tasks folder is assumed to be in
		 * @param $message message MAPI Message to which the task request referes (can be an email or a task)
		 * @param $session session MAPI Session which is used to open tasks folders for delegated task requests or responses
		 */
		function TaskRequest($store, $message, $session) {
			$this->store = $store;
			$this->message = $message;
			$this->session = $session;

			$properties["owner"] = "PT_STRING8:PSETID_Task:0x811f";
			$properties["updatecount"] = "PT_LONG:PSETID_Task:0x8112";
			$properties["taskstate"] = "PT_LONG:PSETID_Task:0x8113";
			$properties["taskmultrecips"] = "PT_LONG:PSETID_Task:0x8120";
			$properties["taskupdates"] = "PT_BOOLEAN:PSETID_Task:0x811b";
			$properties["tasksoc"] = "PT_BOOLEAN:PSETID_Task:0x8119";
			$properties["taskhistory"] = "PT_LONG:PSETID_Task:0x811a";
			$properties["taskmode"] = "PT_LONG:PSETID_Common:0x8518";
			$properties["taskglobalobjid"] = "PT_BINARY:PSETID_Common:0x8519";
			$properties["complete"] = "PT_BOOLEAN:PSETID_Common:0x811c";
			$properties["assignedtime"] = "PT_SYSTIME:PSETID_Task:0x8115";
			$properties["taskfcreator"] = "PT_BOOLEAN:PSETID_Task:0x0x811e";
			$properties["tasklastuser"] = "PT_STRING8:PSETID_Task:0x8122";
			$properties["tasklastdelegate"] = "PT_STRING8:PSETID_Task:0x8125";
			$properties["taskaccepted"] = "PT_BOOLEAN:PSETID_Task:0x8108";
			$properties["delegationstate"] = "PT_LONG:PSETID_Task:0x812a";
			$properties["ownership"] = "PT_LONG:PSETID_Task:0x8129";

			$properties["complete"] = "PT_BOOLEAN:PSETID_Task:0x811c";
			$properties["datecompleted"] = "PT_SYSTIME:PSETID_Task:0x810f";
			$properties["recurring"] = "PT_BOOLEAN:PSETID_Task:0x8126";
			$properties["startdate"] = "PT_SYSTIME:PSETID_Task:0x8104";
			$properties["duedate"] = "PT_SYSTIME:PSETID_Task:0x8105";
			$properties["status"] = "PT_LONG:PSETID_Task:0x8101";
			$properties["percent_complete"] = "PT_DOUBLE:PSETID_Task:0x8102";
			$properties["totalwork"] = "PT_LONG:PSETID_Task:0x8111";
			$properties["actualwork"] = "PT_LONG:PSETID_Task:0x8110";
			$properties["categories"] = "PT_MV_STRING8:PS_PUBLIC_STRINGS:Keywords";
			$properties["companies"] = "PT_MV_STRING8:PSETID_Common:0x8539";
			$properties["mileage"] = "PT_STRING8:PSETID_Common:0x8534";
			$properties["billinginformation"] = "PT_STRING8:PSETID_Common:0x8535";

			$this->props = getPropIdsFromStrings($store, $properties);
		}

		// General functions

		/* Return TRUE if the item is a task request message
		 */
		function isTaskRequest()
		{
			$props = mapi_getprops($this->message, Array(PR_MESSAGE_CLASS));
				
			if(isset($props[PR_MESSAGE_CLASS]) && $props[PR_MESSAGE_CLASS] == "IPM.TaskRequest") {
				return true;
			}
		}

		/* Return TRUE if the item is a task response message
		 */
		function isTaskRequestResponse() {
			$props = mapi_getprops($this->message, Array(PR_MESSAGE_CLASS));

			if(isset($props[PR_MESSAGE_CLASS]) && strpos($props[PR_MESSAGE_CLASS], "IPM.TaskRequest.") === 0) {
				return true;
			}
		}

		/*
		 * Gets the task associated with an IPM.TaskRequest message
		 * 
		 * If the task does not exist yet, it is created, using the attachment object in the
		 * task request item.
		 */
		function getAssociatedTask($create)
		{
			$props = mapi_getprops($this->message, array(PR_MESSAGE_CLASS, $this->props['taskglobalobjid']));
			
			if($props[PR_MESSAGE_CLASS] == "IPM.Task")
				return $this->message; // Message itself is task, so return that

			$tfolder = $this->getDefaultTasksFolder();
			$globalobjid = $props[$this->props['taskglobalobjid']];

			// Find the task by looking for the taskglobalobjid
			$restriction = array(RES_PROPERTY, array(RELOP => RELOP_EQ, ULPROPTAG => $this->props['taskglobalobjid'], VALUE => $globalobjid));
			
			$contents = mapi_folder_getcontentstable($tfolder);
			
			$rows = mapi_table_queryallrows($contents, array(PR_ENTRYID), $restriction);
			
			if(count($rows) == 0) {
				// None found, create one if possible
				if(!$create)
					return false;
					
				$task = mapi_folder_createmessage($tfolder);
				
				$sub = $this->getEmbeddedTask($this->message);
				mapi_copyto($sub, array(), array(), $task);
				
				// Copy sender information from the e-mail
				$senderprops = mapi_getprops($this->message, array(PR_SENT_REPRESENTING_NAME, PR_SENT_REPRESENTING_EMAIL_ADDRESS, PR_SENT_REPRESENTING_ENTRYID, PR_SENT_REPRESENTING_ADDRTYPE, PR_SENT_REPRESENTING_SEARCH_KEY));
				mapi_setprops($task, $senderprops);

				$senderprops = mapi_getprops($this->message, array(PR_SENDER_NAME, PR_SENDER_EMAIL_ADDRESS, PR_SENDER_ENTRYID, PR_SENDER_ADDRTYPE, PR_SENDER_SEARCH_KEY));
				mapi_setprops($task, $senderprops);
				
			} else {
				// If there are multiple, just use the first
				$entryid = $rows[0][PR_ENTRYID];

				$store = $this->getTaskFolderStore(); 
				$task = mapi_msgstore_openentry($store, $entryid);
			}
			
			return $task;
		}



		// Organizer functions (called by the organizer)
			
		/* Processes a task request response, which can be any of the following:
		 * - Task accept (task history is marked as accepted)
		 * - Task decline (task history is marked as declined)
		 * - Task update (updates completion %, etc)
		 */
		function processTaskResponse() {
			$messageprops = mapi_getprops($this->message, array(PR_PROCESSED));
			if(isset($messageprops[PR_PROCESSED]) && $messageprops[PR_PROCESSED])
				return true;

			// Get the task for this response
			$task = $this->getAssociatedTask(false);

			if(!$task) {
				// Got a response for a task that has been deleted, create a new one and mark it as such
				$task = $this->getAssociatedTask(true);
				
				// tdsNOM indicates a task request that had gone missing
				mapi_setprops($task, array($this->props['taskstate'] => tdsNOM ));
			}
			
			// Get the embedded task information and copy it into our task
			$sub = $this->getEmbeddedTask($this->message);
			mapi_copyto($sub, array(), array($this->props['taskstate'], $this->props['taskhistory'], $this->props['taskmode'], $this->props['taskfcreator']), $task);
			
			$props = mapi_getprops($this->message, array(PR_MESSAGE_CLASS));
			
			// Set correct taskmode and taskhistory depending on response type
			switch($props[PR_MESSAGE_CLASS]) {
				case 'IPM.TaskRequest.Accept':
					$taskhistory = thAccepted;
					$taskstate = tdsACC;
					$delegationstate =  olTaskDelegationAccepted;
					break;
				case 'IPM.TaskRequest.Decline':
					$taskhistory = thDeclined;
					$taskstate = tdsDEC;
					$delegationstate =  olTaskDelegationDeclined;
					break;
				case 'IPM.TaskRequest.Update':
					$taskhistory = thUpdated;
					$taskstate = tdsACC; // Doesn't actually change anything
					$delegationstate =  olTaskDelegationAccepted;
					break;
			}

			// Update taskstate (what the task looks like) and task history (last action done by the assignee)
			mapi_setprops($task, array($this->props['taskhistory'] => $taskhistory, $this->props['taskstate'] => $taskstate, $this->props['delegationstate'] => $delegationstate, $this->props['ownership'] => olDelegatedTask));

			mapi_setprops($this->message, array(PR_PROCESSED => true));
			mapi_savechanges($task);
			
			return true;
		}

		/* Create a new message in the current user's outbox and submit it
		 *
		 * Takes the task passed in the constructor as the task to be sent; recipient should
		 * be pre-existing. The task request will be sent to all recipients.
		 */
		function sendTaskRequest($prefix) {
			// Generate a TaskGlobalObjectId
			$taskid = $this->createTGOID();
			$messageprops = mapi_getprops($this->message, array(PR_SUBJECT));

			// Set properties on Task Request
			mapi_setprops($this->message, array(
				$this->props['taskglobalobjid'] => $taskid, /* our new taskglobalobjid */
				$this->props['taskstate'] => tdsACC, 		/* state for our outgoing request */
				$this->props['taskmode'] => tdmtNothing, 	/* we're not sending a change */
				$this->props['updatecount'] => 2,			/* version 2 (no idea) */
				$this->props['delegationstate'] => olTaskDelegationUnknown, /* no reply yet */
				$this->props['ownership'] => olDelegatedTask, /* Task has been assigned */
				$this->props['taskhistory'] => thAssigned,	/* Task has been assigned */
				PR_ICON_INDEX => 1283						/* Task request icon*/
			));
			$this->setLastUser();
			$this->setOwnerForAssignor();
			mapi_savechanges($this->message);

			// Create outgoing task request message
			$outgoing = $this->createOutgoingMessage();
			// No need to copy attachments as task will be attached as embedded message.
			mapi_copyto($this->message, array(), array(PR_MESSAGE_ATTACHMENTS), $outgoing);
			
			// Make it a task request, and put it in sent items after it is sent
			mapi_setprops($outgoing, array(
				PR_MESSAGE_CLASS => "IPM.TaskRequest", 		/* class is task request */
				$this->props['taskstate'] => tdsOWNNEW, 	/* for the recipient the task is new */
				$this->props['taskmode'] => tdmtTaskReq,	/* for the recipient it's a request */
				$this->props['updatecount'] => 1,			/* version 2 is in the attachment */
				PR_SUBJECT => $prefix . $messageprops[PR_SUBJECT],
				PR_ICON_INDEX => 0xFFFFFFFF,				/* show assigned icon */
			));

			// Set Body
			$body = $this->getBody();
			$stream = mapi_openpropertytostream($outgoing, PR_BODY, MAPI_CREATE | MAPI_MODIFY);
			mapi_stream_setsize($stream, strlen($body));
			mapi_stream_write($stream, $body);
			mapi_stream_commit($stream);

			$attach = mapi_message_createattach($outgoing);
			mapi_setprops($attach, array(PR_ATTACH_METHOD => ATTACH_EMBEDDED_MSG, PR_DISPLAY_NAME => $messageprops[PR_SUBJECT]));
			
			$sub = mapi_attach_openproperty($attach, PR_ATTACH_DATA_OBJ, IID_IMessage, 0, MAPI_MODIFY | MAPI_CREATE);
			
			mapi_copyto($this->message, array(), array(), $sub);
			mapi_savechanges($sub);
			
			mapi_savechanges($attach);
			
			mapi_savechanges($outgoing);
			mapi_message_submitmessage($outgoing);
			return true;
		}

		// Assignee functions (called by the assignee)

		/* Update task version counter
		 *
		 * Must be called before each update to increase counter
		 */
		function updateTaskRequest() {
			$messageprops = mapi_getprops($this->message, array($this->props['updatecount']));
			
			if(isset($messageprops)) {
				$messageprops[$this->props['updatecount']]++;
			} else {
				$messageprops[$this->props['updatecount']] = 1;
			}
			
			mapi_setprops($this->message, $messageprops);
		}

		/* Process a task request
		 *
		 * Message passed should be an IPM.TaskRequest message. The task request is then processed to create
		 * the task in the tasks folder if needed.
		 */
		function processTaskRequest() {
			if(!$this->isTaskRequest())
				return false;

			$messageprops = mapi_getprops($this->message, array(PR_PROCESSED));
			if (isset($messageprops[PR_PROCESSED]) && $messageprops[PR_PROCESSED])
				return true;

			$task = $this->getAssociatedTask(true);
			$taskProps = mapi_getprops($task, array($this->props['taskmultrecips']));

			// Set the task state to say that we're the attendee receiving the message, that we have not yet responded and that this message represents no change
			$taskProps[$this->props["taskstate"]] = tdsOWN;
			$taskProps[$this->props["taskhistory"]] = thAssigned;
			$taskProps[$this->props["taskmode"]] = tdmtNothing;
			$taskProps[$this->props["taskaccepted"]] = false;
			$taskProps[$this->props["taskfcreator"]] = false;
			$taskProps[$this->props["ownership"]] = olOwnTask;
			$taskProps[$this->props["delegationstate"]] = olTaskNotDelegated;
			$taskProps[PR_ICON_INDEX] = 1282;

			// This task was assigned to multiple recips, so set this user as owner
			if (isset($taskProps[$this->props['taskmultrecips']]) && $taskProps[$this->props['taskmultrecips']] == tmrSent) {
				$loginUserData = $this->retrieveUserData();

				if ($loginUserData) {
					$taskProps[$this->props['owner']] = $loginUserData[PR_DISPLAY_NAME];
					$taskProps[$this->props['taskmultrecips']] = tmrReceived;
				}
			}
			mapi_setprops($task, $taskProps);

			$this->setAssignorInRecipients($task);

			mapi_savechanges($task);

			$taskprops = mapi_getprops($task, array(PR_ENTRYID));

			mapi_setprops($this->message, array(PR_PROCESSED => true));
			mapi_savechanges($this->message);

			return $taskprops[PR_ENTRYID];
		}

		/* Accept a task request and send the response.
		 *
		 * Message passed should be an IPM.Task (eg the task from getAssociatedTask())
		 *
		 * Copies the task to the user's task folder, sets it to accepted, and sends the acceptation
		 * message back to the organizer. The caller is responsible for removing the message.
		 *
		 * @return entryid EntryID of the accepted task
		 */
		function doAccept($prefix) {
			$messageprops = mapi_getprops($this->message, array($this->props['taskstate']));
			
			if(!isset($messageprops[$this->props['taskstate']]) || $messageprops[$this->props['taskstate']] != tdsOWN)
				return false; // Can only accept assignee task
				
			$this->setLastUser();
			$this->updateTaskRequest();
			
			// Set as accepted        
			mapi_setprops($this->message, array($this->props['taskhistory'] => thAccepted, $this->props['assignedtime'] => time(), $this->props['taskaccepted'] => true,  $this->props['delegationstate'] => olTaskNotDelegated));
			
			mapi_savechanges($this->message);
			
			$this->sendResponse(tdmtTaskAcc, $prefix);

			//@TODO: delete received task request from Inbox
			return $this->deleteReceivedTR();
		}

		/* Decline a task request and send the response.
		 *
		 * Passed message must be a task request message, ie isTaskRequest() must return TRUE.
		 *
		 * Sends the decline message back to the organizer. The caller is responsible for removing the message.
		 *
		 * @return boolean TRUE on success, FALSE on failure
		 */
		function doDecline($prefix) {
			$messageprops = mapi_getprops($this->message, array($this->props['taskstate']));
			
			if(!isset($messageprops[$this->props['taskstate']]) || $messageprops[$this->props['taskstate']] != tdsOWN)
				return false; // Can only decline assignee task
				
			$this->setLastUser();
			$this->updateTaskRequest();

			// Set as declined
			mapi_setprops($this->message, array($this->props['taskhistory'] => thDeclined,  $this->props['delegationstate'] => olTaskDelegationDeclined));
			
			mapi_savechanges($this->message);
			
			return $this->sendResponse(tdmtTaskDec, $prefix);
		}

		/* Send an update of the task if requested, and send the Status-On-Completion report if complete and requested
		 *
		 * If no updates were requested from the organizer, this function does nothing.
		 *
		 * @return boolean TRUE if the update succeeded, FALSE otherwise.
		 */
		function doUpdate($prefix, $prefixComplete) {
			$messageprops = mapi_getprops($this->message, array($this->props['taskstate'], PR_SUBJECT));
			
			if(!isset($messageprops[$this->props['taskstate']]) || $messageprops[$this->props['taskstate']] != tdsOWN)
				return false; // Can only update assignee task
			
			$this->setLastUser();
			$this->updateTaskRequest();

			// Set as updated
			mapi_setprops($this->message, array($this->props['taskhistory'] => thUpdated));
			
			mapi_savechanges($this->message);

			$props = mapi_getprops($this->message, array($this->props['taskupdates'], $this->props['tasksoc'], $this->props['recurring'], $this->props['complete']));
			if ($props[$this->props['taskupdates']] && !(isset($props[$this->props['recurring']]) && $props[$this->props['recurring']]))
				$this->sendResponse(tdmtTaskUpd, $prefix);

			if($props[$this->props['tasksoc']]  && $props[$this->props['complete']] ) {
				$outgoing = $this->createOutgoingMessage();

				mapi_setprops($outgoing, array(PR_SUBJECT => $prefixComplete . $messageprops[PR_SUBJECT]));

				$this->setRecipientsForResponse($outgoing, tdmtTaskUpd, true);
				$body = $this->getBody();
				$stream = mapi_openpropertytostream($outgoing, PR_BODY, MAPI_CREATE | MAPI_MODIFY);
				mapi_stream_setsize($stream, strlen($body));
				mapi_stream_write($stream, $body);
				mapi_stream_commit($stream);

				mapi_savechanges($outgoing);
				mapi_message_submitmessage($outgoing);
			}
		}

		// Internal functions

		/* Get the store associated with the task
		 *
		 * Normally this will just open the store that the processed message is in. However, if the message is opened
		 * by a delegate, this function opens the store that the message was delegated from.
		 */
		function getTaskFolderStore()
		{
			$ownerentryid = false;
			
			$rcvdprops = mapi_getprops($this->message, array(PR_RCVD_REPRESENTING_ENTRYID));
			if(isset($rcvdprops[PR_RCVD_REPRESENTING_ENTRYID])) {
				$ownerentryid = $rcvdprops;
			}
			
			if(!$ownerentryid) {
				$store = $this->store;
			} else {
				$ab = mapi_openaddressbook($session);
				if(!ab) return false;
				
				$mailuser = mapi_ab_openentry($ab, $ownerentryid);
				if(!$mailuser) return false;
				
				$mailuserprops = mapi_getprops($mailuser, array(PR_EMAIL_ADDRESS));
				if(!isset($mailuserprops[PR_EMAIL_ADDRESS])) return false;
				
				$storeid = mapi_msgstore_createentryid($this->store, $mailuserprops[PR_EMAIL_ADDRESS]);
				
				$store = mapi_openmsgstore($this->session, $storeid);
				
			}
			return $store;
		}
			
		/* Open the default task folder for the current user, or the specified user if passed
		 *
		 * @param $ownerentryid (Optional)EntryID of user for which we are opening the task folder
		 */
		function getDefaultTasksFolder()
		{
			$store = $this->getTaskFolderStore();
			
			$inbox = mapi_msgstore_getreceivefolder($store);
			$inboxprops = mapi_getprops($inbox, Array(PR_IPM_TASK_ENTRYID));
			if(!isset($inboxprops[PR_IPM_TASK_ENTRYID]))
				return false;
			
			return mapi_msgstore_openentry($store, $inboxprops[PR_IPM_TASK_ENTRYID]);
		}

		function getSentReprProps($store)
		{
			$storeprops = mapi_getprops($store, array(PR_MAILBOX_OWNER_ENTRYID));
			if(!isset($storeprops[PR_MAILBOX_OWNER_ENTRYID])) return false;
			
			$ab = mapi_openaddressbook($this->session);
			$mailuser = mapi_ab_openentry($ab, $storeprops[PR_MAILBOX_OWNER_ENTRYID]);
			$mailuserprops = mapi_getprops($mailuser, array(PR_ADDRTYPE, PR_EMAIL_ADDRESS, PR_DISPLAY_NAME, PR_SEARCH_KEY, PR_ENTRYID));
			
			$props = array();
			$props[PR_SENT_REPRESENTING_ADDRTYPE] = $mailuserprops[PR_ADDRTYPE];
			$props[PR_SENT_REPRESENTING_EMAIL_ADDRESS] = $mailuserprops[PR_EMAIL_ADDRESS];
			$props[PR_SENT_REPRESENTING_NAME] = $mailuserprops[PR_DISPLAY_NAME];
			$props[PR_SENT_REPRESENTING_SEARCH_KEY] = $mailuserprops[PR_SEARCH_KEY];
			$props[PR_SENT_REPRESENTING_ENTRYID] = $mailuserprops[PR_ENTRYID];
			
			return $props;
		}

		/*
		 * Creates an outgoing message based on the passed message - will set delegate information
		 * and sentmail folder
		 */
		function createOutgoingMessage()
		{
			// Open our default store for this user (that's the only store we can submit in)
			$store = $this->getDefaultStore();
			$storeprops = mapi_getprops($store, array(PR_IPM_OUTBOX_ENTRYID, PR_IPM_SENTMAIL_ENTRYID));
			
			$outbox = mapi_msgstore_openentry($store, $storeprops[PR_IPM_OUTBOX_ENTRYID]);
			if(!$outbox) return false;
			
			$outgoing = mapi_folder_createmessage($outbox);
			if(!$outgoing) return false;

			// Set SENT_REPRESENTING in case we're sending as a delegate
			$ownerstore = $this->getTaskFolderStore();
			$sentreprprops = $this->getSentReprProps($ownerstore);
			mapi_setprops($outgoing, $sentreprprops);
			
			mapi_setprops($outgoing, array(PR_SENTMAIL_ENTRYID => $storeprops[PR_IPM_SENTMAIL_ENTRYID]));
			
			return $outgoing;
		}

		/*
		 * Send a response message (from assignee back to organizer).
		 *
		 * @param $type int Type of response (tdmtTaskAcc, tdmtTaskDec, tdmtTaskUpd);
		 * @return boolean TRUE on success
		 */    
		function sendResponse($type, $prefix)
		{
			// Create a message in our outbox
			$outgoing = $this->createOutgoingMessage();

			$messageprops = mapi_getprops($this->message, array(PR_SUBJECT));

			$attach = mapi_message_createattach($outgoing);
			mapi_setprops($attach, array(PR_ATTACH_METHOD => ATTACH_EMBEDDED_MSG, PR_DISPLAY_NAME => $messageprops[PR_SUBJECT], PR_ATTACHMENT_HIDDEN => true));
			$sub = mapi_attach_openproperty($attach, PR_ATTACH_DATA_OBJ, IID_IMessage, 0, MAPI_CREATE | MAPI_MODIFY);

			mapi_copyto($this->message, array(), array(PR_SENT_REPRESENTING_NAME, PR_SENT_REPRESENTING_EMAIL_ADDRESS, PR_SENT_REPRESENTING_ADDRTYPE, PR_SENT_REPRESENTING_ENTRYID, PR_SENT_REPRESENTING_SEARCH_KEY), $outgoing);
			mapi_copyto($this->message, array(), array(), $sub);

			if (!$this->setRecipientsForResponse($outgoing, $type)) return false;

			switch($type) {
				case tdmtTaskAcc:
					$messageclass = "IPM.TaskRequest.Accept"; 
					break;
				case tdmtTaskDec:
					$messageclass = "IPM.TaskRequest.Decline"; 
					break;
				case tdmtTaskUpd:
					$messageclass = "IPM.TaskRequest.Update"; 
					break;
			};
			
			mapi_savechanges($sub);
			mapi_savechanges($attach);

			// Set Body
			$body = $this->getBody();
			$stream = mapi_openpropertytostream($outgoing, PR_BODY, MAPI_CREATE | MAPI_MODIFY);
			mapi_stream_setsize($stream, strlen($body));
			mapi_stream_write($stream, $body);
			mapi_stream_commit($stream);

			// Set subject, taskmode, message class, icon index, response time
			mapi_setprops($outgoing, array(PR_SUBJECT => $prefix . $messageprops[PR_SUBJECT],
											$this->props['taskmode'] => $type,
											PR_MESSAGE_CLASS => $messageclass,
											PR_ICON_INDEX => 0xFFFFFFFF,
											$this->props['assignedtime'] => time()));

			mapi_savechanges($outgoing);
			mapi_message_submitmessage($outgoing);
			
			return true;
		}

		function getDefaultStore()
		{
			$table = mapi_getmsgstorestable($this->session);
			$rows = mapi_table_queryallrows($table, array(PR_DEFAULT_STORE, PR_ENTRYID));
			
			foreach($rows as $row) {
				if($row[PR_DEFAULT_STORE])
					return mapi_openmsgstore($this->session, $row[PR_ENTRYID]);
			}
			
			return false;
		}

		/* Creates a new TaskGlobalObjId
		 *
		 * Just 16 bytes of random data
		 */
		function createTGOID()
		{
			$goid = "";
			for($i=0;$i<16;$i++) {
				$goid .= chr(rand(0, 255));
			}
			return $goid;  
		}

		function getEmbeddedTask($message) {
			$table = mapi_message_getattachmenttable($message);
			$rows = mapi_table_queryallrows($table, array(PR_ATTACH_NUM));
			
			// Assume only one attachment
			if(count($rows) < 1) return false;
			
			$attach = mapi_message_openattach($message, $rows[0][PR_ATTACH_NUM]);
			$message = mapi_openproperty($attach, PR_ATTACH_DATA_OBJ, IID_IMessage, 0, 0);
			
			return $message;
		}

		function setLastUser() {
			$delegatestore = $this->getDefaultStore();
			$taskstore = $this->getTaskFolderStore();
			
			$delegateprops = mapi_getprops($delegatestore, array(PR_MAILBOX_OWNER_NAME));
			$taskprops = mapi_getprops($taskstore, array(PR_MAILBOX_OWNER_NAME));
			
			// The owner of the task
			$username = $delegateprops[PR_MAILBOX_OWNER_NAME];
			// This is me (the one calling the script)
			$delegate = $taskprops[PR_MAILBOX_OWNER_NAME];
			
			mapi_setprops($this->message, array($this->props["tasklastuser"] => $username, $this->props["tasklastdelegate"] => $delegate, $this->props['assignedtime'] => time()));
		}

		/** Assignee becomes the owner when a user/assignor assigns any task to someone. Also there can be more than one assignee.
		 * This function sets assignee as owner in the assignor's copy of task.
		 */
		function setOwnerForAssignor()
		{
			$recipTable = mapi_message_getrecipienttable($this->message);
			$recips = mapi_table_queryallrows($recipTable, array(PR_DISPLAY_NAME));

			if (count($recips) > 0) {
				$owner = array();
				foreach ($recips as $value) {
					$owner[] = $value[PR_DISPLAY_NAME];
				}

				$props = array($this->props['owner'] => implode("; ", $owner));
				mapi_setprops($this->message, $props);
			}
		}

		/** Sets assignor as recipients in assignee's copy of task.
		 *
		 * If assignor has requested task updates then the assignor is added as recipient type MAPI_CC.
		 *
		 * Also if assignor has request SOC then the assignor is also add as recipient type MAPI_BCC
		 *
		 * @param $task message MAPI message which assignee's copy of task
		 */
		function setAssignorInRecipients($task)
		{
			$recipTable = mapi_message_getrecipienttable($task);

			// Delete all MAPI_TO recipients
			$recips = mapi_table_queryallrows($recipTable, array(PR_ROWID), array(RES_PROPERTY,
																				array(	RELOP => RELOP_EQ,
																						ULPROPTAG => PR_RECIPIENT_TYPE,
																						VALUE => MAPI_TO
																				)));
			foreach($recips as $recip)
				mapi_message_modifyrecipients($task, MODRECIP_REMOVE, array($recip));

			$recips = array();
			$taskReqProps = mapi_getprops($this->message, array(PR_SENT_REPRESENTING_NAME, PR_SENT_REPRESENTING_EMAIL_ADDRESS, PR_SENT_REPRESENTING_ENTRYID, PR_SENT_REPRESENTING_ADDRTYPE));
			$associatedTaskProps = mapi_getprops($task, array($this->props['taskupdates'], $this->props['tasksoc'], $this->props['taskmultrecips']));

			// Build assignor info
			$assignor = array(	PR_ENTRYID => $taskReqProps[PR_SENT_REPRESENTING_ENTRYID],
								PR_DISPLAY_NAME => $taskReqProps[PR_SENT_REPRESENTING_NAME],
								PR_EMAIL_ADDRESS => $taskReqProps[PR_SENT_REPRESENTING_EMAIL_ADDRESS],
								PR_RECIPIENT_DISPLAY_NAME => $taskReqProps[PR_SENT_REPRESENTING_NAME],
								PR_ADDRTYPE => empty($taskReqProps[PR_SENT_REPRESENTING_ADDRTYPE]) ? 'SMTP' : $taskReqProps[PR_SENT_REPRESENTING_ADDRTYPE],
								PR_RECIPIENT_FLAGS => recipSendable
						);

			// Assignor has requested task updates, so set him/her as MAPI_CC in recipienttable.
			if ((isset($associatedTaskProps[$this->props['taskupdates']]) && $associatedTaskProps[$this->props['taskupdates']])
				&& !(isset($associatedTaskProps[$this->props['taskmultrecips']]) && $associatedTaskProps[$this->props['taskmultrecips']] == tmrReceived)) {
				$assignor[PR_RECIPIENT_TYPE] = MAPI_CC;
				$recips[] = $assignor;
			}

			// Assignor wants to receive an email report when task is mark as 'Complete', so in recipients as MAPI_BCC
			if (isset($associatedTaskProps[$this->props['taskupdates']]) && $associatedTaskProps[$this->props['tasksoc']]) {
				$assignor[PR_RECIPIENT_TYPE] = MAPI_BCC;
				$recips[] = $assignor;
			}

			if (count($recips) > 0)
				mapi_message_modifyrecipients($task, MODRECIP_ADD, $recips);
		}

		/** Returns user information who has task request
		 */
		function retrieveUserData()
		{
			// get user entryid
			$storeProps = mapi_getprops($this->store, array(PR_USER_ENTRYID));
			if (!$storeProps[PR_USER_ENTRYID])	return false;

			$ab = mapi_openaddressbook($this->session);
			// open the user entry
			$user = mapi_ab_openentry($ab, $storeProps[PR_USER_ENTRYID]);
			if (!$user) return false;

			// receive userdata
			$userProps = mapi_getprops($user, array(PR_DISPLAY_NAME));
			if (!$userProps[PR_DISPLAY_NAME]) return false;

			return $userProps;
		}

		/** Deletes incoming task request from Inbox
		 *
		 * @returns array returns PR_ENTRYID, PR_STORE_ENTRYID and PR_PARENT_ENTRYID of the deleted task request
		 */
		function deleteReceivedTR()
		{
			$store = $this->getTaskFolderStore();
			$inbox = mapi_msgstore_getreceivefolder($store);

			$storeProps = mapi_getprops($store, array(PR_IPM_WASTEBASKET_ENTRYID));
			$props = mapi_getprops($this->message, array($this->props['taskglobalobjid']));
			$globalobjid = $props[$this->props['taskglobalobjid']];

			// Find the task by looking for the taskglobalobjid
			$restriction = array(RES_PROPERTY, array(RELOP => RELOP_EQ, ULPROPTAG => $this->props['taskglobalobjid'], VALUE => $globalobjid));

			$contents = mapi_folder_getcontentstable($inbox);

			$rows = mapi_table_queryallrows($contents, array(PR_ENTRYID, PR_PARENT_ENTRYID, PR_STORE_ENTRYID), $restriction);

			$taskrequest = false;
			if(count($rows) > 0) {
				// If there are multiple, just use the first
				$entryid = $rows[0][PR_ENTRYID];
				$wastebasket = mapi_msgstore_openentry($store, $storeProps[PR_IPM_WASTEBASKET_ENTRYID]);
				mapi_folder_copymessages($inbox, Array($entryid), $wastebasket, MESSAGE_MOVE);

				return array(PR_ENTRYID => $entryid, PR_PARENT_ENTRYID => $rows[0][PR_PARENT_ENTRYID], PR_STORE_ENTRYID => $rows[0][PR_STORE_ENTRYID]);
			}

			return false;
		}

		/** Converts already sent task request to normal task
		 */
		function createUnassignedCopy()
		{
			mapi_deleteprops($this->message, array($this->props['taskglobalobjid']));
			mapi_setprops($this->message, array($this->props['updatecount'] => 1));

			// Remove all recipents
			$this->deleteAllRecipients($this->message);
		}

		/** Sets recipients for the outgoing message according to type of the response.
		 *
		 * If it is a task update, then only recipient type MAPI_CC are taken from the task message.
		 *
		 * If it is accept/decline response, then PR_SENT_REPRESENTATING_XXXX are taken as recipient.
		 *
		 *@param $outgoing MAPI_message outgoing mapi message 
		 *@param $responseType String response type
		 *@param $sendSOC Boolean true if sending complete response else false.
		 */
		function setRecipientsForResponse($outgoing, $responseType, $sendSOC = false)
		{
			// Clear recipients from outgoing msg
			$this->deleteAllRecipients($outgoing);

			// If it is a task update then get MAPI_CC recipients which are assignors who has asked for task update.
			if ($responseType == tdmtTaskUpd) {
				$recipTable = mapi_message_getrecipienttable($this->message);
				$recips = mapi_table_queryallrows($recipTable, $this->recipprops, array(RES_PROPERTY,
																						array(	RELOP => RELOP_EQ,
																								ULPROPTAG => PR_RECIPIENT_TYPE,
																								VALUE => ($sendSOC ? MAPI_BCC : MAPI_CC)
																						)
												));

				// No recipients found, return error
				if (count($recips) == 0) return false;

				foreach($recips as $recip) {
					$recip[PR_RECIPIENT_TYPE] = MAPI_TO;	// Change recipient type to MAPI_TO
					mapi_message_modifyrecipients($outgoing, MODRECIP_ADD, array($recip));
				}
				return true;
			}

			$orgprops = mapi_getprops($this->message, array(PR_SENT_REPRESENTING_NAME, PR_SENT_REPRESENTING_EMAIL_ADDRESS, PR_SENT_REPRESENTING_ADDRTYPE, PR_SENT_REPRESENTING_ENTRYID, PR_SUBJECT));
			$recip = array(PR_DISPLAY_NAME => $orgprops[PR_SENT_REPRESENTING_NAME], PR_EMAIL_ADDRESS => $orgprops[PR_SENT_REPRESENTING_EMAIL_ADDRESS], PR_ADDRTYPE => $orgprops[PR_SENT_REPRESENTING_ADDRTYPE], PR_ENTRYID => $orgprops[PR_SENT_REPRESENTING_ENTRYID], PR_RECIPIENT_TYPE => MAPI_TO);

			mapi_message_modifyrecipients($outgoing, MODRECIP_ADD, array($recip));

			return true;
		}

		/** Adds task details to message body and returns body.
		 *
		 *@return string contructed body with task details.
		 */
		function getBody()
		{
			//@TODO: Fix translations

			$msgProps = mapi_getprops($this->message);
			$body = "";

			if (isset($msgProps[PR_SUBJECT])) $body .= "\nSubject:\t". $msgProps[PR_SUBJECT];
			if (isset($msgProps[$this->props['startdate']])) $body .= "\nStart Date:\t". strftime("%A, %B %d, %Y",$msgProps[$this->props['startdate']]);
			if (isset($msgProps[$this->props['duedate']])) $body .= "\nDue Date:\t". strftime("%A, %B %d, %Y",$msgProps[$this->props['duedate']]);
			$body .= "\n";

			if (isset($msgProps[$this->props['status']])) {
				$body .= "\nStatus:\t";
				if ($msgProps[$this->props['status']] == 0) $body .= "Not Started";
				else if ($msgProps[$this->props['status']] == 1) $body .= "In Progress";
				else if ($msgProps[$this->props['status']] == 2) $body .= "Complete";
				else if ($msgProps[$this->props['status']] == 3) $body .= "Wait for other person";
				else if ($msgProps[$this->props['status']] == 4) $body .= "Deferred";
			}

			if (isset($msgProps[$this->props['percent_complete']])) {
				$body .= "\nPercent Complete:\t". ($msgProps[$this->props['percent_complete']] * 100).'%';

				if ($msgProps[$this->props['percent_complete']] == 1 && isset($msgProps[$this->props['datecompleted']]))
					$body .= "\nDate Completed:\t". strftime("%A, %B %d, %Y",$msgProps[$this->props['datecompleted']]);
			}
			$body .= "\n";

			if (isset($msgProps[$this->props['totalwork']])) $body .= "\nTotal Work:\t". ($msgProps[$this->props['totalwork']]/60) ." hours";
			if (isset($msgProps[$this->props['actualwork']])) $body .= "\nActual Work:\t". ($msgProps[$this->props['actualwork']]/60) ." hours";
			$body .="\n";

			if (isset($msgProps[$this->props['owner']])) $body .= "\nOwner:\t". $msgProps[$this->props['owner']];
			$body .="\n";

			if (isset($msgProps[$this->props['categories']]) && count($msgProps[$this->props['categories']]) > 0) $body .= "\nCategories:\t". implode(', ', $msgProps[$this->props['categories']]);
			if (isset($msgProps[$this->props['companies']]) && count($msgProps[$this->props['companies']]) > 0) $body .= "\nCompany:\t". implode(', ', $msgProps[$this->props['companies']]);
			if (isset($msgProps[$this->props['billinginformation']])) $body .= "\nBilling Information:\t". $msgProps[$this->props['billinginformation']];
			if (isset($msgProps[$this->props['mileage']])) $body .= "\nMileage:\t". $msgProps[$this->props['mileage']];
			$body .="\n";

			$content = mapi_message_openproperty($this->message, PR_BODY);
			$body .= "\n". trim(windows1252_to_utf8($content), "\0");

			return $body;
		}

		/**
		* Convert from windows-1252 encoded string to UTF-8 string
		*
		* The same conversion rules as utf8_to_windows1252 apply.
		*
		* @see Conversion::utf8_to_windows1252()
		*
		* @param string $string the Windows-1252 string to convert
		* @return string UTF-8 representation of the string
		*/
		function windows1252_to_utf8($string)
		{
			if (function_exists("iconv")){
				return iconv("Windows-1252", "UTF-8//TRANSLIT", $string);
			}else{
				return utf8_encode($string); // no euro support here
			}
		}

		/** Reclaims ownership of a decline task
		 *
		 * Deletes taskrequest properties and recipients from the task message.
		 */
		function reclaimownership()
		{
			// Delete task request properties
			mapi_deleteprops($this->message, array($this->props['taskglobalobjid'],
													$this->props['tasklastuser'],
													$this->props['tasklastdelegate']));

			mapi_setprops($this->message, array($this->props['updatecount'] => 2,
												$this->props['taskfcreator'] => true));

			// Delete recipients
			$this->deleteAllRecipients($this->message);
		}

		/** Deletes all recipients from given message object
		 *
		 *@param $message MAPI message from which recipients are to be removed.
		 */
		function deleteAllRecipients($message)
		{
			$recipTable = mapi_message_getrecipienttable($message);
			$recipRows = mapi_table_queryallrows($recipTable, array(PR_ROWID));

			foreach($recipRows as $recipient)
				mapi_message_modifyrecipients($message, MODRECIP_REMOVE, array($recipient));
		}

		function sendCompleteUpdate($prefix, $action, $prefixComplete)
		{
			$messageprops = mapi_getprops($this->message, array($this->props['taskstate']));
			
			if(!isset($messageprops[$this->props['taskstate']]) || $messageprops[$this->props['taskstate']] != tdsOWN)
				return false; // Can only decline assignee task

			mapi_setprops($this->message, array($this->props['complete'] => true,
												$this->props['datecompleted'] => $action["dateCompleted"],
												$this->props['status'] => 2,
												$this->props['percent_complete'] => 1));

			$this->doUpdate($prefix, $prefixComplete);
		}
	}
?>
