<?php /* CALENDAR $Id: calendar.class.php,v 1.32 2005/04/08 05:01:17 ajdonnison Exp $ */
##
## Calendar classes
##

require_once( $AppUI->getLibraryClass( 'PEAR/Date' ) );
require_once( $AppUI->getSystemClass ('dp' ) );
require_once $AppUI->getSystemClass('libmail');
require_once $AppUI->getSystemClass('date');

/**
* Displays a configuration month calendar
*
* All Date objects are based on the PEAR Date package
*/
class CMonthCalendar {
/**#@+
* @var Date
*/
	var $this_month;
	var $prev_month;
	var $next_month;
	var $prev_year;
	var $next_year;
/**#@-*/

/** @var string The css style name of the Title */
	var $styleTitle;

/** @var string The css style name of the main calendar */
	var $styleMain;

/** @var string The name of the javascript function that a 'day' link should call when clicked */
	var $callback;

/** @var boolean Show the heading */
	var $showHeader;

/** @var boolean Show the previous/next month arrows */
	var $showArrows;

/** @var boolean Show the day name column headings */
	var $showDays;

/** @var boolean Show the week link (no pun intended) in the first column */
	var $showWeek;

/** @var boolean Show the month name as link */
	var $clickMonth;

/** @var boolean Show events in the calendar boxes */
	var $showEvents;

/** @var string */
	var $dayFunc;

/** @var string */
	var $weekFunc;

/** @var boolean Show highlighting in the calendar boxes */
	var $showHighlightedDays;

/**
* @param Date $date
*/
 function CMonthCalendar( $date=null ) {
		$this->setDate( $date );

		$this->classes = array();
		$this->callback = '';
		$this->showTitle = true;
		$this->showArrows = true;
		$this->showDays = true;
		$this->showWeek = true;
		$this->showEvents = true;
		$this->showHighlightedDays = true;
		

		$this->styleTitle = '';
		$this->styleMain = '';

		$this->dayFunc = '';
		$this->weekFunc = '';

		$this->events = array();
		$this->highlightedDays = array();
	}

// setting functions

/**
 * CMonthCalendar::setDate()
 *
 * { Description }
 *
 * @param [type] $date
 */
	 function setDate( $date=null ) {
		$this->this_month = new CDate( $date );

		$d = $this->this_month->getDay();
		$m = $this->this_month->getMonth();
		$y = $this->this_month->getYear();

		//$date = Date_Calc::beginOfPrevMonth( $d, $m, $y-1, FORMAT_ISO );
		$this->prev_year = new CDate( $date );
		$this->prev_year->setYear( $this->prev_year->getYear()-1 );

		$this->next_year = new CDate( $date );
		$this->next_year->setYear( $this->next_year->getYear()+1 );

		$date = Date_Calc::beginOfPrevMonth( $d, $m, $y, FMT_TIMESTAMP_DATE );
		$this->prev_month = new CDate( $date );

		$date = Date_Calc::beginOfNextMonth( $d, $m, $y, FMT_TIMESTAMP_DATE );
		$this->next_month =  new CDate( $date );

	}

/**
 * CMonthCalendar::setStyles()
 *
 * { Description }
 *
 */
	 function setStyles( $title, $main ) {
		$this->styleTitle = $title;
		$this->styleMain = $main;
	}

/**
 * CMonthCalendar::setLinkFunctions()
 *
 * { Description }
 *
 * @param string $day
 * @param string $week
 */
	function setLinkFunctions( $day='', $week='' ) {
		$this->dayFunc = $day;
		$this->weekFunc = $week;
	}

/**
 * CMonthCalendar::setCallback()
 *
 * { Description }
 *
 */
	function setCallback( $function ) {
		$this->callback = $function;
	}

/**
 * CMonthCalendar::setEvents()
 *
 * { Description }
 *
 */
 function setEvents( $e ) {
		$this->events = $e;
	}
	
/**
 * CMonthCalendar::setHighlightedDays()
 * ie 	['20040517'] => '#ff0000',
 *
 * { Description }
 *
 */
 function setHighlightedDays( $hd ) {
		$this->highlightedDays = $hd;
	}
	
// drawing functions
/**
 * CMonthCalendar::show()
 *
 * { Description }
 *
 */
	 function show() {
		$s = '';
		if ($this->showTitle) {
			$s .= $this->_drawTitle();
		}
		$s .= "<table border=\"0\" cellspacing=\"1\" cellpadding=\"2\" width=\"100%\" class=\"" . $this->styleMain . "\">\n";

		if ($this->showDays) {
			$s .= $this->_drawDays();
		}

		$s .= $this->_drawMain();

		$s .= "</table>\n";

		return $s;
	}

/**
 * CMonthCalendar::_drawTitle()
 *
 * { Description }
 *
 */
	 function _drawTitle() {
		global $AppUI, $m, $a, $locale_char_set;
		$url = "index.php?m=$m";
		$url .= $a ? "&a=$a" : '';
		$url .= isset( $_GET['dialog']) ? "&dialog=1" : '';

		$s = "\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"3\" width=\"100%\" class=\"$this->styleTitle\">";
		$s .= "\n\t<tr>";

		if ($this->showArrows) {
			$href = $url.'&date='.$this->prev_month->format(FMT_TIMESTAMP_DATE).($this->callback ? '&callback='.$this->callback : '').((count($this->highlightedDays)>0)?'&uts='.key($this->highlightedDays):'');
			$s .= "\n\t\t<td align=\"left\">";
			$s .= '<a href="'.$href.'"><img src="./images/prev.gif" width="16" height="16" alt="'.$AppUI->_('previous month').'" border="0" /></a>';
			$s .= "</td>";

		}


		$s .= "\n\t<th width=\"99%\" align=\"center\">";
		if ($this->clickMonth) {
			$href = $url.'&date='.$this->this_month->format(FMT_TIMESTAMP_DATE).($this->callback ? '&callback='.$this->callback : '').((count($this->highlightedDays)>0)?'&uts='.key($this->highlightedDays):'');
			$s .= '<a href="'.$href.'">';
		}
		$s .= htmlentities($this->this_month->format( "%B %Y" ), ENT_COMPAT, $locale_char_set);
		$s .= "</th>";

		if ($this->showArrows) {
			$href = $url.'&date='.$this->next_month->format(FMT_TIMESTAMP_DATE).($this->callback ? '&callback='.$this->callback : '').((count($this->highlightedDays)>0)?'&uts='.key($this->highlightedDays):'');
			$s .= "\n\t\t<td align=\"right\">";
			$s .= '<a href="'.$href.'"><img src="./images/next.gif" width="16" height="16" alt="'.$AppUI->_('next month').'" border="0" /></a>';
			$s .= "</td>";
		}

		$s .= "\n\t</tr>";
		$s .= "\n</table>";

		return $s;
	}
/**
* CMonthCalendar::_drawDays()
*
* { Description }
*
* @return string Returns table a row with the day names
*/
	function _drawDays() {
		global $locale_char_set;

		$bow = Date_Calc::beginOfWeek( null,null,null,null,LOCALE_FIRST_DAY );
		$y = substr( $bow, 0, 4 );
		$m = substr( $bow, 4, 2 );
		$d = substr( $bow, 6, 2 );
		$wk = Date_Calc::getCalendarWeek( $d, $m, $y, "%a", LOCALE_FIRST_DAY );

		$s = $this->showWeek ? "\n\t\t<th>&nbsp;</th>" : "";
		foreach( $wk as $day ) {
			$s .= "\n\t\t<th width=\"14%\">" . htmlentities(utf8_encode($day), ENT_COMPAT, $locale_char_set) . "</th>";
		}

		return "\n<tr>$s\n</tr>";
	}

/**
 * CMonthCalendar::_drawMain()
 *
 * { Description }
 *
 */
	 function _drawMain() {
		GLOBAL $AppUI;
		$today = new CDate();
		$today = $today->format( "%Y%m%d%w" );

		$date = $this->this_month;
		$this_day = intval($date->getDay());
		$this_month = intval($date->getMonth());
		$this_year = intval($date->getYear());
		$cal = Date_Calc::getCalendarMonth( $this_month, $this_year, "%Y%m%d%w", LOCALE_FIRST_DAY );

		$df = $AppUI->getPref( 'SHDATEFORMAT' );

		$html = '';
		foreach ($cal as $week) {
			$html .= "\n<tr>";
			if ($this->showWeek) {
				$html .=  "\n\t<td class=\"week\">";
				$html .= $this->dayFunc ? "<a href=\"javascript:$this->weekFunc('$week[0]')\">" : '';
				$html .= '<img src="./images/view.week.gif" width="16" height="15" border="0" alt="Week View" /></a>';
				$html .= $this->dayFunc ? "</a>" : '';
				$html .= "\n\t</td>";
			}

			foreach ($week as $day) {
				$this_day = new CDate( $day );
				$y = intval( substr( $day, 0, 4 ) );
				$m = intval( substr( $day, 4, 2 ) );
				$d = intval( substr( $day, 6, 2 ) );
				$dow = intval( substr( $day, 8, 1 ) );

				if ($m != $this_month) {
					$class = 'empty';
				} else if ($day == $today) {
					$class = 'today';
				} else if ($dow == 0 || $dow == 6) {
					$class = 'weekend';
				} else {
					$class = 'day';
				}
				$day = substr( $day, 0, 8 );
				$html .= "\n\t<td class=\"$class\"";
				if($this->showHighlightedDays && isset($this->highlightedDays[$day])){
					$html .= " style=\"border: 1px solid ".$this->highlightedDays[$day]."\"";
				}
				$html .= ">";
				if ($m == $this_month) {
				    if ($this->dayFunc) {
					$html .= "<a href=\"javascript:$this->dayFunc('$day','".$this_day->format( $df )."')\" class=\"$class\">";
					$html .= "$d";
					$html .= "</a>";
				    } else {
					$html .= "$d";
				  }
				    if ($this->showEvents) {
					$html .= $this->_drawEvents( substr( $day, 0, 8 ) );
				  }
				}
				$html .= "\n\t</td>";
			}
			$html .= "\n</tr>";
		}
		return $html;
	}

/**
 * CMonthCalendar::_drawWeek()
 *
 * { Description }
 *
 */
	 function _drawWeek( $dateObj ) {
		$href = "javascript:$this->weekFunc(".$dateObj->getTimestamp().",'".$dateObj->toString()."')";
		$w = "        <td class=\"week\">";
		$w .= $this->dayFunc ? "<a href=\"$href\">" : '';
		$w .= '<img src="./images/view.week.gif" width="16" height="15" border="0" alt="Week View" /></a>';
		$w .= $this->dayFunc ? "</a>" : '';
		$w .= "</td>\n";
		return $w;
	}

/**
 * CMonthCalendar::_drawEvents()
 *
 * { Description }
 *
 */
	 function _drawEvents( $day ) {
		$s = '';
		if (!isset( $this->events[$day] )) {
			return '';
		}
		$events = $this->events[$day];
		foreach ($events as $e) {
			$href = isset($e['href']) ? $e['href'] : null;
			$alt = isset($e['alt']) ? str_replace("\n",' ',$e['alt']) : null;

			$s .= "<br />\n";
			$s .= $href ? "<a href=\"$href\" class=\"event\" title=\"$alt\">" : '';
			$s .= "{$e['text']}";
			$s .= $href ? '</a>' : '';
		}
		return $s;
	}
}

/**
* Event Class
*
* { Description }
*
*/
class CEvent extends CDpObject {
/** @var int */
	var $event_id = NULL;

/** @var string The title of the event */
	var $event_title = NULL;

	var $event_start_date = NULL;
	var $event_end_date = NULL;
	var $event_parent = NULL;
	var $event_description = NULL;
	var $event_times_recuring = NULL;
	var $event_recurs = NULL;
	var $event_remind = NULL;
	var $event_icon = NULL;
	var $event_owner = NULL;
	var $event_project = NULL;
	var $event_private = NULL;
	var $event_type = NULL;
	var $event_notify = null;
	var $event_cwd = null;

	function CEvent() {
		$this->CDpObject( 'events', 'event_id' );
	}

// overload check operation
	function check() {
	// ensure changes to check boxes and select lists are honoured
		$this->event_private = intval( $this->event_private );
		$this->event_type = intval( $this->event_type );
		$this->event_cwd = intval( $this->event_cwd );
		return NULL;
	}

/**
* Calculating if an recurrent date is in the given period
* @param Date Start date of the period
* @param Date End date of the period
* @param Date Start date of the Date Object
* @param Date End date of the Date Object
* @param integer Type of Recurrence
* @param integer Times of Recurrence
* @param integer Time of Recurrence
* @return array Calculated Start and End Dates for the recurrent Event for the given Period
*/
	function getRecurrentEventforPeriod( $start_date, $end_date, $event_start_date, $event_end_date, $event_recurs, $event_times_recuring, $j ) {

		//this array will be returned
		$transferredEvent = array();

		//create Date Objects for Event Start and Event End
		$eventStart = new CDate( $event_start_date );
		$eventEnd = new CDate( $event_end_date );

		//Time of Recurence = 0 (first occurence of event) has to be checked, too.
		if ($j>0) {
			switch ($event_recurs) {
				case 1:
					$eventStart->addSpan(new Date_Span(3600 * $j));
					$eventEnd->addSpan(new Date_Span(3600 * $j));
					break;
				case 2:
					$eventStart->addDays( $j );
					$eventEnd->addDays( $j );
					break;
				case 3:
					$eventStart->addDays( 7 * $j );
					$eventEnd->addDays( 7 * $j );
					break;
				case 4:
					$eventStart->addDays( 14 * $j );
					$eventEnd->addDays( 14 * $j );
					break;
				case 5:
					$eventStart->addMonths( $j );
					$eventEnd->addMonths( $j );
					break;
				case 6:
					$eventStart->addMonths( 3 * $j );
					$eventEnd->addMonths( 3 * $j );
					break;
				case 7:
					$eventStart->addMonths( 6 * $j );
					$eventEnd->addMonths( 6 * $j );
					break;
				case 8:
					$eventStart->addMonths( 12 * $j );
					$eventEnd->addMonths( 12 * $j );
					break;
				default:
					break;
			}
		}

		if ($start_date->compare ($start_date, $eventStart) <= 0 &&
			$end_date->compare ($end_date, $eventEnd) >= 0)
        {
		// add temporarily moved Event Start and End dates to returnArray
		$transferredEvent = array($eventStart, $eventEnd);
		}

		// return array with event start and end dates for given period (positive case)
		// or an empty array (negative case)
		return $transferredEvent;
	}


/**
* Utility function to return an array of events with a period
* @param Date Start date of the period
* @param Date End date of the period
* @return array A list of events
*/
	function getEventsForPeriod( $start_date, $end_date, $filter = 'all', $user_id = null ) {
		global $AppUI;

	// the event times are stored as unix time stamps, just to be different

	// convert to default db time stamp
		$db_start = $start_date->format( FMT_DATETIME_MYSQL );
		$db_end = $end_date->format( FMT_DATETIME_MYSQL );
		if (! isset($user_id))
		  $user_id = $AppUI->user_id;

		$project =& new CProject;
		$allowedProjects = $project->getAllowedSQL($user_id, 'event_project');
		
		$q  = new DBQuery;
		$q->addTable('events', 'e');
		$q->addQuery('e.*');
		
		if (count ($allowedProjects)) {
		  $q->addWhere('( ( ' . implode(' AND ', $allowedProjects) . ") OR event_project = 0 )");
		  $q->addJoin('projects', 'p', 'p.project_id = e.event_project');
		}

		switch ($filter) {
			case 'my':
				$q->addJoin('user_events', 'ue', 'ue.event_id = e.event_id AND ue.user_id ='.$user_id);
				$q->addWhere("( ( event_private = 0 AND ue.user_id = $user_id )
						OR event_owner=$user_id )");
				break;
			case 'own':
				$q->addWhere("( event_owner = $user_id )");
				break;
			case 'all':
				$q->addWhere("( event_private=0 OR (event_private=1 AND event_owner=$user_id) )");
				break;
		}
		$q->addWhere("( event_start_date <= '$db_end' AND event_end_date >= '$db_start'
				OR event_start_date BETWEEN '$db_start' AND '$db_end')");
		// duplicate query object for recursive events;
		$r = $q;
		
		// assemble query for non-recursive events
		$q->addWhere('( event_recurs <= 0 )');
		$eventList = $q->loadList();


		// assemble query for recursive events
		$r->addWhere('( event_recurs > 0 )');
		$eventListRec = $r->loadList();

	//Calculate the Length of Period (Daily, Weekly, Monthly View)
		$periodLength = Date_Calc::dateDiff($start_date->getDay(),$start_date->getMonth(),$start_date->getYear(),$end_date->getDay(),$end_date->getMonth(),$end_date->getYear());


		// AJD: Should this be going off the end of the array?  I don't think so.
		// If it should then a comment to that effect would be nice.
		// for ($i=0; $i < sizeof($eventListRec)+1;  $i++) {
		for ($i=0; $i < sizeof($eventListRec);  $i++) {

			for ($j=0; $j < intval($eventListRec[$i]['event_times_recuring']); $j++) {

				//Daily View
				//show all
				if ($periodLength == 1){
				$recEventDate = CEvent::getRecurrentEventforPeriod( $start_date, $end_date, $eventListRec[$i]['event_start_date'], $eventListRec[$i]['event_end_date'], $eventListRec[$i]['event_recurs'], $eventListRec[$i]['event_times_recuring'], $j );
				}
				//Weekly or Monthly View and Hourly Recurrent Events
				//only show hourly recurrent event one time and add string 'hourly'
				elseif ($periodLength > 1 && $eventListRec[$i]['event_recurs'] == 1 && $j==0) {
				$recEventDate = CEvent::getRecurrentEventforPeriod( $start_date, $end_date, $eventListRec[$i]['event_start_date'], $eventListRec[$i]['event_end_date'], $eventListRec[$i]['event_recurs'], $eventListRec[$i]['event_times_recuring'], $j );
				$eventListRec[$i]['event_title'] = $eventListRec[$i]['event_title']." (".$AppUI->_('Hourly').")";
				}
				//Weekly and Monthly View and higher recurrence mode
				//show all events of recurrence > 1
				elseif ($periodLength > 1 && $eventListRec[$i]['event_recurs'] > 1) {
				$recEventDate = CEvent::getRecurrentEventforPeriod( $start_date, $end_date, $eventListRec[$i]['event_start_date'], $eventListRec[$i]['event_end_date'], $eventListRec[$i]['event_recurs'], $eventListRec[$i]['event_times_recuring'], $j );
				}
				//add values to the eventsArray if check for recurrent event was positive
				if ( sizeof($recEventDate) > 0 ) {
					$eList[0] = $eventListRec[$i];
					$eList[0]['event_start_date'] = $recEventDate[0]->format( FMT_DATETIME_MYSQL );
					$eList[0]['event_end_date'] = $recEventDate[1]->format( FMT_DATETIME_MYSQL );
					$eventList = array_merge($eventList,$eList);
				}
				// clear array of positive recurrent events for the case that next loop recEventDate is empty in order to avoid double display
				$recEventDate = array();
			}



		}

		//return a list of non-recurrent and recurrent events
		return $eventList;
	}


	function &getAssigned() {
		$q  = new DBQuery;
		$q->addTable('users', 'u');
		$q->addTable('user_events', 'ue');
		$q->addTable('contacts', 'con');
		$q->addQuery('u.user_id, CONCAT_WS(" ",contact_first_name, contact_last_name)');
		$q->addWhere("ue.event_id = $this->event_id");
		$q->addWhere('user_contact = contact_id');
		$q->addWhere('ue.user_id = u.user_id');
		$assigned = $q->loadHashList();
		return $assigned;
	}

	function updateAssigned($assigned) {
		// First remove the assigned from the user_events table
		global $AppUI;
		$sql = "DELETE from user_events WHERE event_id = $this->event_id";
		$q  = new DBQuery;
		$q->addWhere("event_id = $this->event_id");
		$q->setDelete('user_events');		
		$q->exec();
		$q->clear();
		
		if (is_array($assigned) && count($assigned)) {
			
			foreach ($assigned as $uid) {
			    if ($uid) {
				$q->addTable('user_events', 'ue');
				$q->addInsert('event_id', $this->event_id);
				$q->addInsert('user_id', $uid);
				$q->exec();
				$q->clear();
			    }
			}
			
			  if ($msg = db_error())
				$AppUI->setMsg($msg, UI_MSG_ERROR);
		}
	}

	function notify($assignees, $update = false, $clash = false)
	{
	  global $AppUI, $locale_char_set, $dPconfig;
	  $mail_owner = $AppUI->getPref('MAILALL');
	  $assignee_list = explode(",", $assignees);
	  $owner_is_assigned = in_array($this->event_owner, $assignee_list);
	  if ($mail_owner && ! $owner_is_assigned && $this->event_owner) {
	  	array_push($assignee_list, $this->event_owner);
	  }
		// Remove any empty elements otherwise implode has a problem
		foreach ($assignee_list as $key => $x) {
			if (! $x)
				unset($assignee_list[$key]);
		}
	  if (! count($assignee_list))
	  	return;
		
		$q  = new DBQuery;
		$q->addTable('users','u');
		$q->addTable('contacts','con');
		$q->addQuery('user_id, contact_first_name,contact_last_name, contact_email');
		$q->addWhere('u.user_contact = con.contact_id');
		$q->addWhere("user_id in ( " . implode(',', $assignee_list) . ")");
		$users = $q->loadHashList('user_id');
	
	  $date_format = $AppUI->getPref('SHDATEFORMAT');
	  $time_format = $AppUI->getPref('TIMEFORMAT');
	  $fmt = "$date_format $time_format";

	  $start_date =& new CDate($this->event_start_date);
	  $end_date =& new CDate($this->event_end_date);

	  $mail =& new Mail;
	  $type = $update ? $AppUI->_('Updated') : $AppUI->_('New');
	  if ($clash) {
	    $mail->Subject($AppUI->_('Requested Event') . ": " . $this->event_title, $locale_char_set);
	  } else  {
	    $mail->Subject($type . " " . $AppUI->_('Event') . ": " . $this->event_title, $locale_char_set);
	  }
	  $mail->From( '"' . $AppUI->user_first_name . " " . $AppUI->user_last_name 
				. '" <' . $AppUI->user_email . '>');

	  $body = '';
	  if ($clash) {
	    $body .= "You have been invited to an event by $AppUI->user_first_name $AppUI->uset_last_name\n";
	    $body .= "However, either you or another intended invitee has a competing event\n";
	    $body .= "$AppUI->user_first_name $AppUI->user_last_name has requested that you reply to this message\n";
	    $body .= "and confirm if you can or can not make the requested time.\n\n";
	  }
	  $body .= $AppUI->_('Event') . ":\t" . $this->event_title . "\n";
	  if (! $clash)
	    $body .= $AppUI->_('URL') . ":\t" . $dPconfig['base_url'] . "/index.php?m=calendar&a=view&event_id=" . $this->event_id . "\n";
	  $body .= $AppUI->_('Starts') . ":\t" . $start_date->format($fmt) . "\n";
	  $body .= $AppUI->_('Ends') . ":\t" . $end_date->format($fmt) . "\n";

	  // Find the project name.
	  if ($this->event_project) {
		$prj = array();
		$q  = new DBQuery;
		$q->addTable('projects','p');
		$q->addQuery('project_name');
		$q->addWhere('p.project_id ='.$this->event_project);
		$sql = $q->prepare();
		$q->clear();
		$prj = db_loadHash($sql);
	  	$body .= $AppUI->_('Project') . ":\t". $prj['project_name'];
	  }

	  $types = dPgetSysVal('EventType');

	  $body .= $AppUI->_('Type') . ":\t" . $AppUI->_($types[$this->event_type]) . "\n";
	  $body .= $AppUI->_('Attendees') . ":\t";
	  $start = false;
	  foreach ($users as $user) {
		if ($start)
			$body .=",";
		else
			$start = true;
	  	$body .= "$user[contact_first_name] $user[contact_last_name]";
	  }
	  $body .= "\n\n" . $this->event_description . "\n";

	  $mail->Body($body, $locale_char_set);

	  foreach ($users as $user) {
		if (! $mail_owner && $user['user_id'] == $this->event_owner)
			continue;
	  	$mail->To($user['contact_email'], true);
		$mail->Send();
	  }
	}

	function checkClash($userlist = null)
	{
	  global $AppUI;
	  if (! isset($userlist))
	    return false;
	  $users = explode(',', $userlist);

	  // Now, remove the owner from the list, as we will always clash on this.
	  $key = array_search($AppUI->user_id, $users);
	  if (isset($key) && $key !== false) // Need both for change in php 4.2.0
	    unset($users[$key]);

	  if (! count($users))
	    return false;

	  $start_date =& new CDate($this->event_start_date);
	  $end_date =& new CDate($this->event_end_date);

	  // Now build a query to find matching events.
	$q  = new DBQuery;
	$q->addTable('events', 'e');
	$q->addQuery('e.event_owner, ue.user_id, e.event_cwd, e.event_id, e.event_start_date, e.event_end_date');
	$q->addJoin('user_events', 'ue', 'ue.event_id = e.event_id');
	$q->addWhere("event_start_date <= '" . $end_date->format(FMT_DATETIME_MYSQL) . "'");
	$q->addWhere("event_end_date >= '" . $start_date->format(FMT_DATETIME_MYSQL) . "'");
	$q->addWhere("( e.event_owner in (" . implode(',', $users) . ") OR ue.user_id in (" . implode(',', $users) .") )");

	$result = $q->exec();
	  if (! $result)
	    return false;

	  $clashes = array();
	  while ($row = db_fetch_assoc($result)) {
	    array_push($clashes, $row['event_owner']);
	    if ($row['user_id'])
	      array_push($clashes, $row['user_id']);
	  }
	  $clash = array_unique($clashes);
		$q->clear();
	  if (count($clash)) {  
		$q->addTable('users','u');
		$q->addTable('contacts','con');
		$q->addQuery('user_id');
		$q->addQuery('CONCAT_WS(" ",contact_first_name,contact_last_name)');
		$q->addWhere("user_id in (" . implode(",", $clash) . ")");
		$q->addWhere('user_contact = contact_id');
		return $q->loadHashList();
	  } else {
	    return false;
	  }

	}

	function getEventsInWindow($start_date, $end_date, $start_time, $end_time, $users = null)
	{
	  if (! isset($users))
	    return false;
	  if (! count($users))
	    return false;

	  // Now build a query to find matching events. 
	$q  = new DBQuery;
	$q->addTable('events', 'e');
	$q->addQuery('e.event_owner, ue.user_id, e.event_cwd, e.event_id, e.event_start_date, e.event_end_date');
	$q->addJoin('user_events', 'ue', 'ue.event_id = e.event_id');
	$q->addWhere("event_start_date >= '$start_date'
	  		AND event_end_date <= '$end_date'
	  		AND EXTRACT(HOUR_MINUTE FROM e.event_end_date) >= '$start_time'
	  		AND EXTRACT(HOUR_MINUTE FROM e.event_start_date) <= '$end_time'
	  		AND ( e.event_owner in (" . implode(",", $users) . ")
	 		OR ue.user_id in (" . implode(",", $users) .") )");
	$result = $q->exec();
	  if (! $result)
	    return false;

	  $eventlist = array();
	  while ($row = db_fetch_assoc($result)) {
	    $eventlist[] = $row;
	  }
		$q->clear();

	  return $eventlist;
	}



}

$event_filter_list = array (
	'my' => 'My Events',
	'own' => 'Events I Created',
	'all' => 'All Events'
);
?>
