/**

  * This function processes posting/editing/deleting a calendar event.

  * 	- calls Post() function if event is linked to a post.

  *  - calls insertEvent() to insert the event if not linked to post.

  * It requires the calendar_post permission to use.

  * It uses the event_post sub template in the Calendar template.

  * It is accessed with ?action=calendar;sa=post.

 /**

  * This function offers up a download of an event in iCal 2.0 format.

  */

 function iCalDownload()

 {

 	// Goes without saying that this is required.

 	if (!isset($_REQUEST['eventid']))

 		fatal_lang_error('no_access', false);

 	// Load up the event in question and check it exists.

 	$event = getEventProperties($_REQUEST['eventid']);

 	if ($event === false)

 		fatal_lang_error('no_access', false);

 		$title[$id] .= "\n";

 	}

 	$filecontents = '';

 	$filecontents .= 'BEGIN:VCALENDAR' . "\n";

 	$filecontents .= 'VERSION:2.0' . "\n";

 	$filecontents .= 'BEGIN:VEVENT' . "\n";

 	$filecontents .= 'SUMMARY:' . implode('', $title);

 	$filecontents .= 'END:VEVENT' . "\n";

 	$filecontents .= 'END:VCALENDAR';

 		@ob_start('ob_gzhandler');

 	else

 		ob_start();

 	// Send the file headers

 	header('Pragma: ');

 	header('Cache-Control: no-cache');

 	header('Accept-Ranges: bytes');

 	header('Connection: close');

 	header('Content-Disposition: attachment; filename=' . $event['title'] . '.ics');

 	// This is a calendar item!

 	header('Content-Type: text/calendar');

 				'title' => $row['title'],

 				'can_edit' => allowedTo('calendar_edit_any') || ($row['id_member'] == $user_info['id'] && allowedTo('calendar_edit_own')),

 				'modify_href' => $scripturl . '?action=post;msg=' . $topicinfo['id_first_msg'] . ';topic=' . $topic . '.0;calendar;eventid=' . $row['id_event'] . ';' . $context['session_var'] . '=' . $context['session_id'],

 				'start_date' => timeformat($start_date, $date_string, 'none'),

 				'start_timestamp' => $start_date,

 				'end_date' => timeformat($end_date, $date_string, 'none'),

 			array('permissions', 'calendar_post'),

 			array('permissions', 'calendar_edit_own'),

 			array('permissions', 'calendar_edit_any'),

 		'',

 			// How many days to show on board index, and where to display events etc?

 			array('int', 'cal_days_for_index', 6, 'postinput' => $txt['days_word']),

 			'pm_read' => array(false, 'pm', 'use_pm_system'),

 			'pm_send' => array(false, 'pm', 'use_pm_system'),

 			'calendar_view' => array(false, 'calendar', 'view_basic_info'),

 			'calendar_post' => array(false, 'calendar', 'post_calendar'),

 			'calendar_edit' => array(true, 'calendar', 'post_calendar', 'moderate_general'),

 			'admin_forum' => array(false, 'maintenance', 'administrate'),

 		$hiddenPermissions[] = 'calendar_view';

 		$hiddenPermissions[] = 'calendar_post';

 		$hiddenPermissions[] = 'calendar_edit';

 	}

 	if (!in_array('w', $context['admin_features']))

 		$hiddenPermissions[] = 'issue_warning';

 }

 /**

  * @param string $earliest_date

  * @param string $latest_date

  * @param bool $use_permissions = true

 	while ($row = $smcFunc['db_fetch_assoc']($result))

 	{

 		// If the attached topic is not approved then for the moment pretend it doesn't exist

 		if (!empty($row['id_first_msg']) && $modSettings['postmod_active'] && !$row['approved'])

 			continue;

 				$events[strftime('%Y-%m-%d', $date)][] = array(

 					'id' => $row['id_event'],

 					'title' => $row['title'],

 					'start_date' => $row['start_date'],

 					'end_date' => $row['end_date'],

 					'is_last' => false,

 				);

 			// Otherwise, this is going to be cached and the VIEWER'S permissions should apply... just put together some info.

 			else

 				$events[strftime('%Y-%m-%d', $date)][] = array(

 					'id' => $row['id_event'],

 					'title' => $row['title'],

 					'start_date' => $row['start_date'],

 					'end_date' => $row['end_date'],

 					'is_last' => false,

 					'id_board' => $row['id_board'],

 					'href' => $row['id_topic'] == 0 ? '' : $scripturl . '?topic=' . $row['id_topic'] . '.0',

 					'link' => $row['id_topic'] == 0 ? $row['title'] : '<a href="' . $scripturl . '?topic=' . $row['id_topic'] . '.0">' . $row['title'] . '</a>',

 					'can_edit' => false,

 				);

 		}

 	}

 	// Properly sanitize the title.

 	$eventOptions['title'] = $smcFunc['htmlspecialchars']($eventOptions['title'], ENT_QUOTES);

 	// Scan the start date for validity and get its components.

 	if (($num_results = sscanf($eventOptions['start_date'], '%d-%d-%d', $year, $month, $day)) !== 3)

 		trigger_error('modifyEvent(): invalid start date format given', E_USER_ERROR);

 	// Set the end date to the start date + span (if the end date wasn't already given).

 	if (!isset($eventOptions['end_date']))

 		$eventOptions['end_date'] = strftime('%Y-%m-%d', mktime(0, 0, 0, $month, $day, $year) + $eventOptions['span'] * 86400);

 	$smcFunc['db_query']('', '

 			c.id_event, c.id_board, c.id_topic, MONTH(c.start_date) AS month,

 			DAYOFMONTH(c.start_date) AS day, YEAR(c.start_date) AS year,

 			(TO_DAYS(c.end_date) - TO_DAYS(c.start_date)) AS span, c.id_member, c.title,

 		FROM {db_prefix}calendar AS c

 			LEFT JOIN {db_prefix}topics AS t ON (t.id_topic = c.id_topic)

 		WHERE c.id_event = {int:id_event}',

 		array(

 			'id_event' => $event_id,

 		'title' => $row['title'],

 		'span' => 1 + $row['span'],

 		'member' => $row['id_member'],

 		'topic' => array(

 			'id' => $row['id_topic'],

 			'member_started' => $row['id_member_started'],

 			//		title, href, is_last, can_edit (are they allowed?), modify_href, and is_today.

 			foreach ($context['calendar_events'] as $event)

 				echo '

 		}

 		echo '

 	// Start the main table.

 	echo '

 			<div class="cat_bar">

 				<h3 class="catbg">

 					', $context['page_title'], '

 					<fieldset id="event_main">

 						<legend><span', isset($context['post_error']['no_event']) ? ' class="error"' : '', '>', $txt['calendar_event_title'], '</span></legend>

 						<input type="text" name="evtitle" maxlength="255" size="70" value="', $context['event']['title'], '" class="input_text" />

 							<input type="hidden" name="calendar" value="1" />', $txt['calendar_year'], '

 							<select name="year" id="year" onchange="generateDays();">';

 					</fieldset>';

 	echo '

 						<input type="submit" value="', empty($context['event']['new']) ? $txt['save'] : $txt['post'], '" class="button_submit" />';

 	// Delete button?

 	if (empty($context['event']['new']))

 	echo '

 						<input type="hidden" name="', $context['session_var'], '" value="', $context['session_id'], '" />

 						<input type="hidden" name="eventid" value="', $context['event']['eventid'], '" />

 				</div>

 				<span class="lowerframe"><span></span></span>

 			</div>

 }

 // Display a monthly calendar grid.

 				if (!empty($day['events']))

 				{

 					echo '

 					/* The events are made up of:

 						title, href, is_last, can_edit (are they allowed to?), and modify_href. */

 					foreach ($day['events'] as $event)

 					{

 						if ($event['can_edit'])

 							echo '

 						echo '

 					}

 					echo '

 					// If they can edit the event, show a star they can click on....

 					if ($event['can_edit'])

 						echo '

 					echo '

 								', $event['link'], $event['is_last'] ? '' : ', ';

 		foreach ($context['linked_calendar_events'] as $event)

 			echo '

 							<li>

 							</li>';

 		echo '

 }

 .edit_event

 {

 }

 /* Poll question */

 #poll

 $txt['cannot_post_unapproved_replies_any'] = 'You do not have permission to post unapproved replies to other users\' topics.';

 $txt['cannot_calendar_edit_any'] = 'You cannot edit calendar events.';

 $txt['cannot_calendar_edit_own'] = 'You don\'t have the privileges necessary to edit your own events.';

 $txt['cannot_calendar_post'] = 'Event posting isn\'t allowed - sorry.';

 $txt['cannot_calendar_view'] = 'Sorry, but you are not allowed to view the calendar.';

 $txt['cannot_remove_any'] = 'Sorry, but you don\'t have the privilege to remove just any topic.  Check to make sure this topic wasn\'t just moved to another board.';

 $txt['calendar_settings_desc'] = 'Here you can enable the calendar, and determine the settings that it should use.';

 $txt['save_settings'] = 'Save Settings';

 $txt['groups_calendar_view'] = 'Membergroups allowed to view the calendar';

 $txt['groups_calendar_post'] = 'Membergroups allowed to create events';

 $txt['groups_calendar_edit_own'] = 'Membergroups allowed to edit their own events';

 $txt['groups_calendar_edit_any'] = 'Membergroups allowed to edit any events';

 $txt['permissionhelp_calendar_edit'] = 'An Event is a topic linked to a certain date or date range. The event can be edited by clicking the red asterisk (*) next to the event in the calendar view. In order to be able to edit an event, a user must have sufficient permissions to edit the first message of the topic that is linked to the event.';

 $txt['permissionname_calendar_edit_own'] = 'Own events';

 $txt['permissionname_calendar_edit_any'] = 'Any events';

 $txt['permissiongroup_maintenance'] = 'Forum administration';

 $txt['permissionname_admin_forum'] = 'Administrate forum and database';