--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/forum/Sources/Subs-Calendar.php	Sun Jul 07 11:25:48 2013 +0200
@@ -0,0 +1,1046 @@
+<?php
+
+/**
+ * Simple Machines Forum (SMF)
+ *
+ * @package SMF
+ * @author Simple Machines http://www.simplemachines.org
+ * @copyright 2011 Simple Machines
+ * @license http://www.simplemachines.org/about/smf/license.php BSD
+ *
+ * @version 2.0
+ */
+
+if (!defined('SMF'))
+	die('Hacking attempt...');
+
+/*	This file contains several functions for retrieving and manipulating
+	calendar events, birthdays and holidays.
+
+	array getBirthdayRange(string earliest_date, string latest_date)
+		- finds all the birthdays in the specified range of days.
+		- earliest_date and latest_date are inclusive, and should both be in
+		  the YYYY-MM-DD format.
+		- works with birthdays set for no year, or any other year, and
+		  respects month and year boundaries.
+		- returns an array of days, each of which an array of birthday
+		  information for the context.
+
+	array getEventRange(string earliest_date, string latest_date,
+			bool use_permissions = true)
+		- finds all the posted calendar events within a date range.
+		- both the earliest_date and latest_date should be in the standard
+		  YYYY-MM-DD format.
+		- censors the posted event titles.
+		- uses the current user's permissions if use_permissions is true,
+		  otherwise it does nothing "permission specific".
+		- returns an array of contextual information if use_permissions is
+		  true, and an array of the data needed to build that otherwise.
+
+	array getHolidayRange(string earliest_date, string latest_date)
+		- finds all the applicable holidays for the specified date range.
+		- earliest_date and latest_date should be YYYY-MM-DD.
+		- returns an array of days, which are all arrays of holiday names.
+
+	void canLinkEvent()
+		- checks if the current user can link the current topic to the
+		  calendar, permissions et al.
+		- this requires the calendar_post permission, a forum moderator, or a
+		  topic starter.
+		- expects the $topic and $board variables to be set.
+		- if the user doesn't have proper permissions, an error will be shown.
+
+	array getTodayInfo()
+		- returns an array with the current date, day, month, and year.
+		- takes the users time offset into account.
+
+	array getCalendarGrid(int month, int year, array calendarOptions)
+		- returns an array containing all the information needed to show a
+		  calendar grid for the given month.
+		- also provides information (link, month, year) about the previous and
+		  next month.
+
+	array getCalendarWeek(int month, int year, int day, array calendarOptions)
+		- as for getCalendarGrid but provides information relating to the week
+		  within which the passed date sits.
+
+	array cache_getOffsetIndependentEvents(int days_to_index)
+		- cache callback function used to retrieve the birthdays, holidays, and
+		  events between now and now + days_to_index.
+		- widens the search range by an extra 24 hours to support time offset
+		  shifts.
+		- used by the cache_getRecentEvents function to get the information
+		  needed to calculate the events taking the users time offset into
+		  account.
+
+	array cache_getRecentEvents(array eventOptions)
+		- cache callback function used to retrieve the upcoming birthdays,
+		  holidays, and events within the given period, taking into account
+		  the users time offset.
+		- used by the board index and SSI to show the upcoming events.
+
+	void validateEventPost()
+		- checks if the calendar post was valid.
+
+	int getEventPoster(int event_id)
+		- gets the member_id of an event identified by event_id.
+		- returns false if the event was not found.
+
+	void insertEvent(array eventOptions)
+		- inserts the passed event information into the calendar table.
+		- allows to either set a time span (in days) or an end_date.
+		- does not check any permissions of any sort.
+
+	void modifyEvent(int event_id, array eventOptions)
+		- modifies an event.
+		- allows to either set a time span (in days) or an end_date.
+		- does not check any permissions of any sort.
+
+	void removeEvent(int event_id)
+		- removes an event.
+		- does no permission checks.
+*/
+
+// Get all birthdays within the given time range.
+function getBirthdayRange($low_date, $high_date)
+{
+	global $scripturl, $modSettings, $smcFunc;
+
+	// We need to search for any birthday in this range, and whatever year that birthday is on.
+	$year_low = (int) substr($low_date, 0, 4);
+	$year_high = (int) substr($high_date, 0, 4);
+
+	// Collect all of the birthdays for this month.  I know, it's a painful query.
+	$result = $smcFunc['db_query']('birthday_array', '
+		SELECT id_member, real_name, YEAR(birthdate) AS birth_year, birthdate
+		FROM {db_prefix}members
+		WHERE YEAR(birthdate) != {string:year_one}
+			AND MONTH(birthdate) != {int:no_month}
+			AND DAYOFMONTH(birthdate) != {int:no_day}
+			AND YEAR(birthdate) <= {int:max_year}
+			AND (
+				DATE_FORMAT(birthdate, {string:year_low}) BETWEEN {date:low_date} AND {date:high_date}' . ($year_low == $year_high ? '' : '
+				OR DATE_FORMAT(birthdate, {string:year_high}) BETWEEN {date:low_date} AND {date:high_date}') . '
+			)
+			AND is_activated = {int:is_activated}',
+		array(
+			'is_activated' => 1,
+			'no_month' => 0,
+			'no_day' => 0,
+			'year_one' => '0001',
+			'year_low' => $year_low . '-%m-%d',
+			'year_high' => $year_high . '-%m-%d',
+			'low_date' => $low_date,
+			'high_date' => $high_date,
+			'max_year' => $year_high,
+		)
+	);
+	$bday = array();
+	while ($row = $smcFunc['db_fetch_assoc']($result))
+	{
+		if ($year_low != $year_high)
+			$age_year = substr($row['birthdate'], 5) < substr($high_date, 5) ? $year_high : $year_low;
+		else
+			$age_year = $year_low;
+
+		$bday[$age_year . substr($row['birthdate'], 4)][] = array(
+			'id' => $row['id_member'],
+			'name' => $row['real_name'],
+			'age' => $row['birth_year'] > 4 && $row['birth_year'] <= $age_year ? $age_year - $row['birth_year'] : null,
+			'is_last' => false
+		);
+	}
+	$smcFunc['db_free_result']($result);
+
+	// Set is_last, so the themes know when to stop placing separators.
+	foreach ($bday as $mday => $array)
+		$bday[$mday][count($array) - 1]['is_last'] = true;
+
+	return $bday;
+}
+
+// Get all events within the given time range.
+function getEventRange($low_date, $high_date, $use_permissions = true)
+{
+	global $scripturl, $modSettings, $user_info, $smcFunc, $context;
+
+	$low_date_time = sscanf($low_date, '%04d-%02d-%02d');
+	$low_date_time = mktime(0, 0, 0, $low_date_time[1], $low_date_time[2], $low_date_time[0]);
+	$high_date_time = sscanf($high_date, '%04d-%02d-%02d');
+	$high_date_time = mktime(0, 0, 0, $high_date_time[1], $high_date_time[2], $high_date_time[0]);
+
+	// Find all the calendar info...
+	$result = $smcFunc['db_query']('', '
+		SELECT
+			cal.id_event, cal.start_date, cal.end_date, cal.title, cal.id_member, cal.id_topic,
+			cal.id_board, b.member_groups, t.id_first_msg, t.approved, b.id_board
+		FROM {db_prefix}calendar AS cal
+			LEFT JOIN {db_prefix}boards AS b ON (b.id_board = cal.id_board)
+			LEFT JOIN {db_prefix}topics AS t ON (t.id_topic = cal.id_topic)
+		WHERE cal.start_date <= {date:high_date}
+			AND cal.end_date >= {date:low_date}' . ($use_permissions ? '
+			AND (cal.id_board = {int:no_board_link} OR {query_wanna_see_board})' : ''),
+		array(
+			'high_date' => $high_date,
+			'low_date' => $low_date,
+			'no_board_link' => 0,
+		)
+	);
+	$events = array();
+	while ($row = $smcFunc['db_fetch_assoc']($result))
+	{
+		// If the attached topic is not approved then for the moment pretend it doesn't exist
+		//!!! This should be fixed to show them all and then sort by approval state later?
+		if (!empty($row['id_first_msg']) && $modSettings['postmod_active'] && !$row['approved'])
+			continue;
+
+		// Force a censor of the title - as often these are used by others.
+		censorText($row['title'], $use_permissions ? false : true);
+
+		$start_date = sscanf($row['start_date'], '%04d-%02d-%02d');
+		$start_date = max(mktime(0, 0, 0, $start_date[1], $start_date[2], $start_date[0]), $low_date_time);
+		$end_date = sscanf($row['end_date'], '%04d-%02d-%02d');
+		$end_date = min(mktime(0, 0, 0, $end_date[1], $end_date[2], $end_date[0]), $high_date_time);
+
+		$lastDate = '';
+		for ($date = $start_date; $date <= $end_date; $date += 86400)
+		{
+			// Attempt to avoid DST problems.
+			//!!! Resolve this properly at some point.
+			if (strftime('%Y-%m-%d', $date) == $lastDate)
+				$date += 3601;
+			$lastDate = strftime('%Y-%m-%d', $date);
+
+			// If we're using permissions (calendar pages?) then just ouput normal contextual style information.
+			if ($use_permissions)
+				$events[strftime('%Y-%m-%d', $date)][] = array(
+					'id' => $row['id_event'],
+					'title' => $row['title'],
+					'can_edit' => allowedTo('calendar_edit_any') || ($row['id_member'] == $user_info['id'] && allowedTo('calendar_edit_own')),
+					'modify_href' => $scripturl . '?action=' . ($row['id_board'] == 0 ? 'calendar;sa=post;' : 'post;msg=' . $row['id_first_msg'] . ';topic=' . $row['id_topic'] . '.0;calendar;') . 'eventid=' . $row['id_event'] . ';' . $context['session_var'] . '=' . $context['session_id'],
+					'href' => $row['id_board'] == 0 ? '' : $scripturl . '?topic=' . $row['id_topic'] . '.0',
+					'link' => $row['id_board'] == 0 ? $row['title'] : '<a href="' . $scripturl . '?topic=' . $row['id_topic'] . '.0">' . $row['title'] . '</a>',
+					'start_date' => $row['start_date'],
+					'end_date' => $row['end_date'],
+					'is_last' => false,
+					'id_board' => $row['id_board'],
+				);
+			// 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'],
+					'topic' => $row['id_topic'],
+					'msg' => $row['id_first_msg'],
+					'poster' => $row['id_member'],
+					'start_date' => $row['start_date'],
+					'end_date' => $row['end_date'],
+					'is_last' => false,
+					'allowed_groups' => explode(',', $row['member_groups']),
+					'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,
+				);
+		}
+	}
+	$smcFunc['db_free_result']($result);
+
+	// If we're doing normal contextual data, go through and make things clear to the templates ;).
+	if ($use_permissions)
+	{
+		foreach ($events as $mday => $array)
+			$events[$mday][count($array) - 1]['is_last'] = true;
+	}
+
+	return $events;
+}
+
+// Get all holidays within the given time range.
+function getHolidayRange($low_date, $high_date)
+{
+	global $smcFunc;
+
+	// Get the lowest and highest dates for "all years".
+	if (substr($low_date, 0, 4) != substr($high_date, 0, 4))
+		$allyear_part = 'event_date BETWEEN {date:all_year_low} AND {date:all_year_dec}
+			OR event_date BETWEEN {date:all_year_jan} AND {date:all_year_high}';
+	else
+		$allyear_part = 'event_date BETWEEN {date:all_year_low} AND {date:all_year_high}';
+
+	// Find some holidays... ;).
+	$result = $smcFunc['db_query']('', '
+		SELECT event_date, YEAR(event_date) AS year, title
+		FROM {db_prefix}calendar_holidays
+		WHERE event_date BETWEEN {date:low_date} AND {date:high_date}
+			OR ' . $allyear_part,
+		array(
+			'low_date' => $low_date,
+			'high_date' => $high_date,
+			'all_year_low' => '0004' . substr($low_date, 4),
+			'all_year_high' => '0004' . substr($high_date, 4),
+			'all_year_jan' => '0004-01-01',
+			'all_year_dec' => '0004-12-31',
+		)
+	);
+	$holidays = array();
+	while ($row = $smcFunc['db_fetch_assoc']($result))
+	{
+		if (substr($low_date, 0, 4) != substr($high_date, 0, 4))
+			$event_year = substr($row['event_date'], 5) < substr($high_date, 5) ? substr($high_date, 0, 4) : substr($low_date, 0, 4);
+		else
+			$event_year = substr($low_date, 0, 4);
+
+		$holidays[$event_year . substr($row['event_date'], 4)][] = $row['title'];
+	}
+	$smcFunc['db_free_result']($result);
+
+	return $holidays;
+}
+
+// Does permission checks to see if an event can be linked to a board/topic.
+function canLinkEvent()
+{
+	global $user_info, $topic, $board, $smcFunc;
+
+	// If you can't post, you can't link.
+	isAllowedTo('calendar_post');
+
+	// No board?  No topic?!?
+	if (empty($board))
+		fatal_lang_error('missing_board_id', false);
+	if (empty($topic))
+		fatal_lang_error('missing_topic_id', false);
+
+	// Administrator, Moderator, or owner.  Period.
+	if (!allowedTo('admin_forum') && !allowedTo('moderate_board'))
+	{
+		// Not admin or a moderator of this board. You better be the owner - or else.
+		$result = $smcFunc['db_query']('', '
+			SELECT id_member_started
+			FROM {db_prefix}topics
+			WHERE id_topic = {int:current_topic}
+			LIMIT 1',
+			array(
+				'current_topic' => $topic,
+			)
+		);
+		if ($row = $smcFunc['db_fetch_assoc']($result))
+		{
+			// Not the owner of the topic.
+			if ($row['id_member_started'] != $user_info['id'])
+				fatal_lang_error('not_your_topic', 'user');
+		}
+		// Topic/Board doesn't exist.....
+		else
+			fatal_lang_error('calendar_no_topic', 'general');
+		$smcFunc['db_free_result']($result);
+	}
+}
+
+// Returns date information about 'today' relative to the users time offset.
+function getTodayInfo()
+{
+	return array(
+		'day' => (int) strftime('%d', forum_time()),
+		'month' => (int) strftime('%m', forum_time()),
+		'year' => (int) strftime('%Y', forum_time()),
+		'date' => strftime('%Y-%m-%d', forum_time()),
+	);
+}
+
+// Returns the information needed to show a calendar grid for the given month.
+function getCalendarGrid($month, $year, $calendarOptions)
+{
+	global $scripturl, $modSettings;
+
+	// Eventually this is what we'll be returning.
+	$calendarGrid = array(
+		'week_days' => array(),
+		'weeks' => array(),
+		'short_day_titles' => !empty($calendarOptions['short_day_titles']),
+		'current_month' => $month,
+		'current_year' => $year,
+		'show_next_prev' => !empty($calendarOptions['show_next_prev']),
+		'show_week_links' => !empty($calendarOptions['show_week_links']),
+		'previous_calendar' => array(
+			'year' => $month == 1 ? $year - 1 : $year,
+			'month' => $month == 1 ? 12 : $month - 1,
+			'disabled' => $modSettings['cal_minyear'] > ($month == 1 ? $year - 1 : $year),
+		),
+		'next_calendar' => array(
+			'year' => $month == 12 ? $year + 1 : $year,
+			'month' => $month == 12 ? 1 : $month + 1,
+			'disabled' => $modSettings['cal_maxyear'] < ($month == 12 ? $year + 1 : $year),
+		),
+		//!!! Better tweaks?
+		'size' => isset($calendarOptions['size']) ? $calendarOptions['size'] : 'large',
+	);
+
+	// Get todays date.
+	$today = getTodayInfo();
+
+	// Get information about this month.
+	$month_info = array(
+		'first_day' => array(
+			'day_of_week' => (int) strftime('%w', mktime(0, 0, 0, $month, 1, $year)),
+			'week_num' => (int) strftime('%U', mktime(0, 0, 0, $month, 1, $year)),
+			'date' => strftime('%Y-%m-%d', mktime(0, 0, 0, $month, 1, $year)),
+		),
+		'last_day' => array(
+			'day_of_month' => (int) strftime('%d', mktime(0, 0, 0, $month == 12 ? 1 : $month + 1, 0, $month == 12 ? $year + 1 : $year)),
+			'date' => strftime('%Y-%m-%d', mktime(0, 0, 0, $month == 12 ? 1 : $month + 1, 0, $month == 12 ? $year + 1 : $year)),
+		),
+		'first_day_of_year' => (int) strftime('%w', mktime(0, 0, 0, 1, 1, $year)),
+		'first_day_of_next_year' => (int) strftime('%w', mktime(0, 0, 0, 1, 1, $year + 1)),
+	);
+
+	// The number of days the first row is shifted to the right for the starting day.
+	$nShift = $month_info['first_day']['day_of_week'];
+
+	$calendarOptions['start_day'] = empty($calendarOptions['start_day']) ? 0 : (int) $calendarOptions['start_day'];
+
+	// Starting any day other than Sunday means a shift...
+	if (!empty($calendarOptions['start_day']))
+	{
+		$nShift -= $calendarOptions['start_day'];
+		if ($nShift < 0)
+			$nShift = 7 + $nShift;
+	}
+
+	// Number of rows required to fit the month.
+	$nRows = floor(($month_info['last_day']['day_of_month'] + $nShift) / 7);
+	if (($month_info['last_day']['day_of_month'] + $nShift) % 7)
+		$nRows++;
+
+	// Fetch the arrays for birthdays, posted events, and holidays.
+	$bday = $calendarOptions['show_birthdays'] ? getBirthdayRange($month_info['first_day']['date'], $month_info['last_day']['date']) : array();
+	$events = $calendarOptions['show_events'] ? getEventRange($month_info['first_day']['date'], $month_info['last_day']['date']) : array();
+	$holidays = $calendarOptions['show_holidays'] ? getHolidayRange($month_info['first_day']['date'], $month_info['last_day']['date']) : array();
+
+	// Days of the week taking into consideration that they may want it to start on any day.
+	$count = $calendarOptions['start_day'];
+	for ($i = 0; $i < 7; $i++)
+	{
+		$calendarGrid['week_days'][] = $count;
+		$count++;
+		if ($count == 7)
+			$count = 0;
+	}
+
+	// An adjustment value to apply to all calculated week numbers.
+	if (!empty($calendarOptions['show_week_num']))
+	{
+		// If the first day of the year is a Sunday, then there is no
+		// adjustment to be made. However, if the first day of the year is not
+		// a Sunday, then there is a partial week at the start of the year
+		// that needs to be accounted for.
+		if ($calendarOptions['start_day'] === 0)
+			$nWeekAdjust = $month_info['first_day_of_year'] === 0 ? 0 : 1;
+		// If we are viewing the weeks, with a starting date other than Sunday,
+		// then things get complicated! Basically, as PHP is calculating the
+		// weeks with a Sunday starting date, we need to take this into account
+		// and offset the whole year dependant on whether the first day in the
+		// year is above or below our starting date. Note that we offset by
+		// two, as some of this will get undone quite quickly by the statement
+		// below.
+		else
+			$nWeekAdjust = $calendarOptions['start_day'] > $month_info['first_day_of_year'] && $month_info['first_day_of_year'] !== 0 ? 2 : 1;
+
+		// If our week starts on a day greater than the day the month starts
+		// on, then our week numbers will be one too high. So we need to
+		// reduce it by one - all these thoughts of offsets makes my head
+		// hurt...
+		if ($month_info['first_day']['day_of_week'] < $calendarOptions['start_day'] || $month_info['first_day_of_year'] > 4)
+			$nWeekAdjust--;
+	}
+	else
+		$nWeekAdjust = 0;
+
+	// Iterate through each week.
+	$calendarGrid['weeks'] = array();
+	for ($nRow = 0; $nRow < $nRows; $nRow++)
+	{
+		// Start off the week - and don't let it go above 52, since that's the number of weeks in a year.
+		$calendarGrid['weeks'][$nRow] = array(
+			'days' => array(),
+			'number' => $month_info['first_day']['week_num'] + $nRow + $nWeekAdjust
+		);
+		// Handle the dreaded "week 53", it can happen, but only once in a blue moon ;)
+		if ($calendarGrid['weeks'][$nRow]['number'] == 53 && $nShift != 4 && $month_info['first_day_of_next_year'] < 4)
+			$calendarGrid['weeks'][$nRow]['number'] = 1;
+
+		// And figure out all the days.
+		for ($nCol = 0; $nCol < 7; $nCol++)
+		{
+			$nDay = ($nRow * 7) + $nCol - $nShift + 1;
+
+			if ($nDay < 1 || $nDay > $month_info['last_day']['day_of_month'])
+				$nDay = 0;
+
+			$date = sprintf('%04d-%02d-%02d', $year, $month, $nDay);
+
+			$calendarGrid['weeks'][$nRow]['days'][$nCol] = array(
+				'day' => $nDay,
+				'date' => $date,
+				'is_today' => $date == $today['date'],
+				'is_first_day' => !empty($calendarOptions['show_week_num']) && (($month_info['first_day']['day_of_week'] + $nDay - 1) % 7 == $calendarOptions['start_day']),
+				'holidays' => !empty($holidays[$date]) ? $holidays[$date] : array(),
+				'events' => !empty($events[$date]) ? $events[$date] : array(),
+				'birthdays' => !empty($bday[$date]) ? $bday[$date] : array()
+			);
+		}
+	}
+
+	// Set the previous and the next month's links.
+	$calendarGrid['previous_calendar']['href'] = $scripturl . '?action=calendar;year=' . $calendarGrid['previous_calendar']['year'] . ';month=' . $calendarGrid['previous_calendar']['month'];
+	$calendarGrid['next_calendar']['href'] = $scripturl . '?action=calendar;year=' . $calendarGrid['next_calendar']['year'] . ';month=' . $calendarGrid['next_calendar']['month'];
+
+	return $calendarGrid;
+}
+
+// Returns the information needed to show a calendar for the given week.
+function getCalendarWeek($month, $year, $day, $calendarOptions)
+{
+	global $scripturl, $modSettings;
+
+	// Get todays date.
+	$today = getTodayInfo();
+
+	// What is the actual "start date" for the passed day.
+	$calendarOptions['start_day'] = empty($calendarOptions['start_day']) ? 0 : (int) $calendarOptions['start_day'];
+	$day_of_week = (int) strftime('%w', mktime(0, 0, 0, $month, $day, $year));
+	if ($day_of_week != $calendarOptions['start_day'])
+	{
+		// Here we offset accordingly to get things to the real start of a week.
+		$date_diff = $day_of_week - $calendarOptions['start_day'];
+		if ($date_diff < 0)
+			$date_diff += 7;
+		$new_timestamp = mktime(0, 0, 0, $month, $day, $year) - $date_diff * 86400;
+		$day = (int) strftime('%d', $new_timestamp);
+		$month = (int) strftime('%m', $new_timestamp);
+		$year = (int) strftime('%Y', $new_timestamp);
+	}
+
+	// Now start filling in the calendar grid.
+	$calendarGrid = array(
+		'show_next_prev' => !empty($calendarOptions['show_next_prev']),
+		// Previous week is easy - just step back one day.
+		'previous_week' => array(
+			'year' => $day == 1 ? ($month == 1 ? $year - 1 : $year) : $year,
+			'month' => $day == 1 ? ($month == 1 ? 12 : $month - 1) : $month,
+			'day' => $day == 1 ? 28 : $day - 1,
+			'disabled' => $day < 7 && $modSettings['cal_minyear'] > ($month == 1 ? $year - 1 : $year),
+		),
+		'next_week' => array(
+			'disabled' => $day > 25 && $modSettings['cal_maxyear'] < ($month == 12 ? $year + 1 : $year),
+		),
+	);
+
+	// The next week calculation requires a bit more work.
+	$curTimestamp = mktime(0, 0, 0, $month, $day, $year);
+	$nextWeekTimestamp = $curTimestamp + 604800;
+	$calendarGrid['next_week']['day'] = (int) strftime('%d', $nextWeekTimestamp);
+	$calendarGrid['next_week']['month'] = (int) strftime('%m', $nextWeekTimestamp);
+	$calendarGrid['next_week']['year'] = (int) strftime('%Y', $nextWeekTimestamp);
+
+	// Fetch the arrays for birthdays, posted events, and holidays.
+	$startDate = strftime('%Y-%m-%d', $curTimestamp);
+	$endDate = strftime('%Y-%m-%d', $nextWeekTimestamp);
+	$bday = $calendarOptions['show_birthdays'] ? getBirthdayRange($startDate, $endDate) : array();
+	$events = $calendarOptions['show_events'] ? getEventRange($startDate, $endDate) : array();
+	$holidays = $calendarOptions['show_holidays'] ? getHolidayRange($startDate, $endDate) : array();
+
+	// An adjustment value to apply to all calculated week numbers.
+	if (!empty($calendarOptions['show_week_num']))
+	{
+		$first_day_of_year = (int) strftime('%w', mktime(0, 0, 0, 1, 1, $year));
+		$first_day_of_next_year = (int) strftime('%w', mktime(0, 0, 0, 1, 1, $year + 1));
+		$last_day_of_last_year = (int) strftime('%w', mktime(0, 0, 0, 12, 31, $year - 1));
+
+		// All this is as getCalendarGrid.
+		if ($calendarOptions['start_day'] === 0)
+			$nWeekAdjust = $first_day_of_year === 0 && $first_day_of_year > 3 ? 0 : 1;
+		else
+			$nWeekAdjust = $calendarOptions['start_day'] > $first_day_of_year && $first_day_of_year !== 0 ? 2 : 1;
+
+		$calendarGrid['week_number'] = (int) strftime('%U', mktime(0, 0, 0, $month, $day, $year)) + $nWeekAdjust;
+
+		// If this crosses a year boundry and includes january it should be week one.
+		if ((int) strftime('%Y', $curTimestamp + 518400) != $year && $calendarGrid['week_number'] > 53 && $first_day_of_next_year < 5)
+			$calendarGrid['week_number'] = 1;
+	}
+
+	// This holds all the main data - there is at least one month!
+	$calendarGrid['months'] = array();
+	$lastDay = 99;
+	$curDay = $day;
+	$curDayOfWeek = $calendarOptions['start_day'];
+	for ($i = 0; $i < 7; $i++)
+	{
+		// Have we gone into a new month (Always happens first cycle too)
+		if ($lastDay > $curDay)
+		{
+			$curMonth = $lastDay == 99 ? $month : ($month == 12 ? 1 : $month + 1);
+			$curYear = $lastDay == 99 ? $year : ($curMonth == 1 && $month == 12 ? $year + 1 : $year);
+			$calendarGrid['months'][$curMonth] = array(
+				'current_month' => $curMonth,
+				'current_year' => $curYear,
+				'days' => array(),
+			);
+		}
+
+		// Add todays information to the pile!
+		$date = sprintf('%04d-%02d-%02d', $curYear, $curMonth, $curDay);
+
+		$calendarGrid['months'][$curMonth]['days'][$curDay] = array(
+			'day' => $curDay,
+			'day_of_week' => $curDayOfWeek,
+			'date' => $date,
+			'is_today' => $date == $today['date'],
+			'holidays' => !empty($holidays[$date]) ? $holidays[$date] : array(),
+			'events' => !empty($events[$date]) ? $events[$date] : array(),
+			'birthdays' => !empty($bday[$date]) ? $bday[$date] : array()
+		);
+
+		// Make the last day what the current day is and work out what the next day is.
+		$lastDay = $curDay;
+		$curTimestamp += 86400;
+		$curDay = (int) strftime('%d', $curTimestamp);
+
+		// Also increment the current day of the week.
+		$curDayOfWeek = $curDayOfWeek >= 6 ? 0 : ++$curDayOfWeek;
+	}
+
+	// Set the previous and the next week's links.
+	$calendarGrid['previous_week']['href'] = $scripturl . '?action=calendar;viewweek;year=' . $calendarGrid['previous_week']['year'] . ';month=' . $calendarGrid['previous_week']['month'] . ';day=' . $calendarGrid['previous_week']['day'];
+	$calendarGrid['next_week']['href'] = $scripturl . '?action=calendar;viewweek;year=' . $calendarGrid['next_week']['year'] . ';month=' . $calendarGrid['next_week']['month'] . ';day=' . $calendarGrid['next_week']['day'];
+
+	return $calendarGrid;
+}
+
+// Retrieve all events for the given days, independently of the users offset.
+function cache_getOffsetIndependentEvents($days_to_index)
+{
+	global $sourcedir;
+
+	$low_date = strftime('%Y-%m-%d', forum_time(false) - 24 * 3600);
+	$high_date = strftime('%Y-%m-%d', forum_time(false) + $days_to_index * 24 * 3600);
+
+	return array(
+		'data' => array(
+			'holidays' => getHolidayRange($low_date, $high_date),
+			'birthdays' => getBirthdayRange($low_date, $high_date),
+			'events' => getEventRange($low_date, $high_date, false),
+		),
+		'refresh_eval' => 'return \'' . strftime('%Y%m%d', forum_time(false)) . '\' != strftime(\'%Y%m%d\', forum_time(false)) || (!empty($modSettings[\'calendar_updated\']) && ' . time() . ' < $modSettings[\'calendar_updated\']);',
+		'expires' => time() + 3600,
+	);
+}
+
+// Called from the BoardIndex to display the current day's events on the board index.
+function cache_getRecentEvents($eventOptions)
+{
+	global $modSettings, $user_info, $scripturl;
+
+	// With the 'static' cached data we can calculate the user-specific data.
+	$cached_data = cache_quick_get('calendar_index', 'Subs-Calendar.php', 'cache_getOffsetIndependentEvents', array($eventOptions['num_days_shown']));
+
+	// Get the information about today (from user perspective).
+	$today = getTodayInfo();
+
+	$return_data = array(
+		'calendar_holidays' => array(),
+		'calendar_birthdays' => array(),
+		'calendar_events' => array(),
+	);
+
+	// Set the event span to be shown in seconds.
+	$days_for_index = $eventOptions['num_days_shown'] * 86400;
+
+	// Get the current member time/date.
+	$now = forum_time();
+
+	// Holidays between now and now + days.
+	for ($i = $now; $i < $now + $days_for_index; $i += 86400)
+	{
+		if (isset($cached_data['holidays'][strftime('%Y-%m-%d', $i)]))
+			$return_data['calendar_holidays'] = array_merge($return_data['calendar_holidays'], $cached_data['holidays'][strftime('%Y-%m-%d', $i)]);
+	}
+
+	// Happy Birthday, guys and gals!
+	for ($i = $now; $i < $now + $days_for_index; $i += 86400)
+	{
+		$loop_date = strftime('%Y-%m-%d', $i);
+		if (isset($cached_data['birthdays'][$loop_date]))
+		{
+			foreach ($cached_data['birthdays'][$loop_date] as $index => $dummy)
+				$cached_data['birthdays'][strftime('%Y-%m-%d', $i)][$index]['is_today'] = $loop_date === $today['date'];
+			$return_data['calendar_birthdays'] = array_merge($return_data['calendar_birthdays'], $cached_data['birthdays'][$loop_date]);
+		}
+	}
+
+	$duplicates = array();
+	for ($i = $now; $i < $now + $days_for_index; $i += 86400)
+	{
+		// Determine the date of the current loop step.
+		$loop_date = strftime('%Y-%m-%d', $i);
+
+		// No events today? Check the next day.
+		if (empty($cached_data['events'][$loop_date]))
+			continue;
+
+		// Loop through all events to add a few last-minute values.
+		foreach ($cached_data['events'][$loop_date] as $ev => $event)
+		{
+			// Create a shortcut variable for easier access.
+			$this_event = &$cached_data['events'][$loop_date][$ev];
+
+			// Skip duplicates.
+			if (isset($duplicates[$this_event['topic'] . $this_event['title']]))
+			{
+				unset($cached_data['events'][$loop_date][$ev]);
+				continue;
+			}
+			else
+				$duplicates[$this_event['topic'] . $this_event['title']] = true;
+
+			// Might be set to true afterwards, depending on the permissions.
+			$this_event['can_edit'] = false;
+			$this_event['is_today'] = $loop_date === $today['date'];
+			$this_event['date'] = $loop_date;
+		}
+
+		if (!empty($cached_data['events'][$loop_date]))
+			$return_data['calendar_events'] = array_merge($return_data['calendar_events'], $cached_data['events'][$loop_date]);
+	}
+
+	// Mark the last item so that a list separator can be used in the template.
+	for ($i = 0, $n = count($return_data['calendar_birthdays']); $i < $n; $i++)
+		$return_data['calendar_birthdays'][$i]['is_last'] = !isset($return_data['calendar_birthdays'][$i + 1]);
+	for ($i = 0, $n = count($return_data['calendar_events']); $i < $n; $i++)
+		$return_data['calendar_events'][$i]['is_last'] = !isset($return_data['calendar_events'][$i + 1]);
+
+	return array(
+		'data' => $return_data,
+		'expires' => time() + 3600,
+		'refresh_eval' => 'return \'' . strftime('%Y%m%d', forum_time(false)) . '\' != strftime(\'%Y%m%d\', forum_time(false)) || (!empty($modSettings[\'calendar_updated\']) && ' . time() . ' < $modSettings[\'calendar_updated\']);',
+		'post_retri_eval' => '
+			global $context, $scripturl, $user_info;
+
+			foreach ($cache_block[\'data\'][\'calendar_events\'] as $k => $event)
+			{
+				// Remove events that the user may not see or wants to ignore.
+				if ((count(array_intersect($user_info[\'groups\'], $event[\'allowed_groups\'])) === 0 && !allowedTo(\'admin_forum\') && !empty($event[\'id_board\'])) || in_array($event[\'id_board\'], $user_info[\'ignoreboards\']))
+					unset($cache_block[\'data\'][\'calendar_events\'][$k]);
+				else
+				{
+					// Whether the event can be edited depends on the permissions.
+					$cache_block[\'data\'][\'calendar_events\'][$k][\'can_edit\'] = allowedTo(\'calendar_edit_any\') || ($event[\'poster\'] == $user_info[\'id\'] && allowedTo(\'calendar_edit_own\'));
+
+					// The added session code makes this URL not cachable.
+					$cache_block[\'data\'][\'calendar_events\'][$k][\'modify_href\'] = $scripturl . \'?action=\' . ($event[\'topic\'] == 0 ? \'calendar;sa=post;\' : \'post;msg=\' . $event[\'msg\'] . \';topic=\' . $event[\'topic\'] . \'.0;calendar;\') . \'eventid=\' . $event[\'id\'] . \';\' . $context[\'session_var\'] . \'=\' . $context[\'session_id\'];
+				}
+			}
+
+			if (empty($params[0][\'include_holidays\']))
+				$cache_block[\'data\'][\'calendar_holidays\'] = array();
+			if (empty($params[0][\'include_birthdays\']))
+				$cache_block[\'data\'][\'calendar_birthdays\'] = array();
+			if (empty($params[0][\'include_events\']))
+				$cache_block[\'data\'][\'calendar_events\'] = array();
+
+			$cache_block[\'data\'][\'show_calendar\'] = !empty($cache_block[\'data\'][\'calendar_holidays\']) || !empty($cache_block[\'data\'][\'calendar_birthdays\']) || !empty($cache_block[\'data\'][\'calendar_events\']);',
+	);
+}
+
+// Makes sure the calendar post is valid.
+function validateEventPost()
+{
+	global $modSettings, $txt, $sourcedir, $smcFunc;
+
+	if (!isset($_POST['deleteevent']))
+	{
+		// No month?  No year?
+		if (!isset($_POST['month']))
+			fatal_lang_error('event_month_missing', false);
+		if (!isset($_POST['year']))
+			fatal_lang_error('event_year_missing', false);
+
+		// Check the month and year...
+		if ($_POST['month'] < 1 || $_POST['month'] > 12)
+			fatal_lang_error('invalid_month', false);
+		if ($_POST['year'] < $modSettings['cal_minyear'] || $_POST['year'] > $modSettings['cal_maxyear'])
+			fatal_lang_error('invalid_year', false);
+	}
+
+	// Make sure they're allowed to post...
+	isAllowedTo('calendar_post');
+
+	if (isset($_POST['span']))
+	{
+		// Make sure it's turned on and not some fool trying to trick it.
+		if (empty($modSettings['cal_allowspan']))
+			fatal_lang_error('no_span', false);
+		if ($_POST['span'] < 1 || $_POST['span'] > $modSettings['cal_maxspan'])
+			fatal_lang_error('invalid_days_numb', false);
+	}
+
+	// There is no need to validate the following values if we are just deleting the event.
+	if (!isset($_POST['deleteevent']))
+	{
+		// No day?
+		if (!isset($_POST['day']))
+			fatal_lang_error('event_day_missing', false);
+		if (!isset($_POST['evtitle']) && !isset($_POST['subject']))
+			fatal_lang_error('event_title_missing', false);
+		elseif (!isset($_POST['evtitle']))
+			$_POST['evtitle'] = $_POST['subject'];
+
+		// Bad day?
+		if (!checkdate($_POST['month'], $_POST['day'], $_POST['year']))
+			fatal_lang_error('invalid_date', false);
+
+		// No title?
+		if ($smcFunc['htmltrim']($_POST['evtitle']) === '')
+			fatal_lang_error('no_event_title', false);
+		if ($smcFunc['strlen']($_POST['evtitle']) > 30)
+			$_POST['evtitle'] = $smcFunc['substr']($_POST['evtitle'], 0, 30);
+		$_POST['evtitle'] = str_replace(';', '', $_POST['evtitle']);
+	}
+}
+
+// Get the event's poster.
+function getEventPoster($event_id)
+{
+	global $smcFunc;
+
+	// A simple database query, how hard can that be?
+	$request = $smcFunc['db_query']('', '
+		SELECT id_member
+		FROM {db_prefix}calendar
+		WHERE id_event = {int:id_event}
+		LIMIT 1',
+		array(
+			'id_event' => $event_id,
+		)
+	);
+
+	// No results, return false.
+	if ($smcFunc['db_num_rows'] === 0)
+		return false;
+
+	// Grab the results and return.
+	list ($poster) = $smcFunc['db_fetch_row']($request);
+	$smcFunc['db_free_result']($request);
+	return $poster;
+}
+
+// Consolidating the various INSERT statements into this function.
+function insertEvent(&$eventOptions)
+{
+	global $modSettings, $smcFunc;
+
+	// Add special chars to the title.
+	$eventOptions['title'] = $smcFunc['htmlspecialchars']($eventOptions['title'], ENT_QUOTES);
+
+	// Add some sanity checking to the span.
+	$eventOptions['span'] = isset($eventOptions['span']) && $eventOptions['span'] > 0 ? (int) $eventOptions['span'] : 0;
+
+	// Make sure the start date is in ISO order.
+	if (($num_results = sscanf($eventOptions['start_date'], '%d-%d-%d', $year, $month, $day)) !== 3)
+		trigger_error('modifyEvent(): invalid start date format given', E_USER_ERROR);
+
+	// Set the end date (if not yet given)
+	if (!isset($eventOptions['end_date']))
+		$eventOptions['end_date'] = strftime('%Y-%m-%d', mktime(0, 0, 0, $month, $day, $year) + $eventOptions['span'] * 86400);
+
+	// If no topic and board are given, they are not linked to a topic.
+	$eventOptions['board'] = isset($eventOptions['board']) ? (int) $eventOptions['board'] : 0;
+	$eventOptions['topic'] = isset($eventOptions['topic']) ? (int) $eventOptions['topic'] : 0;
+
+	// Insert the event!
+	$smcFunc['db_insert']('',
+		'{db_prefix}calendar',
+		array(
+			'id_board' => 'int', 'id_topic' => 'int', 'title' => 'string-60', 'id_member' => 'int',
+			'start_date' => 'date', 'end_date' => 'date',
+		),
+		array(
+			$eventOptions['board'], $eventOptions['topic'], $eventOptions['title'], $eventOptions['member'],
+			$eventOptions['start_date'], $eventOptions['end_date'],
+		),
+		array('id_event')
+	);
+
+	// Store the just inserted id_event for future reference.
+	$eventOptions['id'] = $smcFunc['db_insert_id']('{db_prefix}calendar', 'id_event');
+
+	// Update the settings to show something calendarish was updated.
+	updateSettings(array(
+		'calendar_updated' => time(),
+	));
+}
+
+function modifyEvent($event_id, &$eventOptions)
+{
+	global $smcFunc;
+
+	// 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);
+
+	// Default span to 0 days.
+	$eventOptions['span'] = isset($eventOptions['span']) ? (int) $eventOptions['span'] : 0;
+
+	// Set the end date to the start date + span (if the end date wasn't already given).
+	if (!isset($eventOptions['end_date']))
+		$eventOptions['end_date'] = strftime('%Y-%m-%d', mktime(0, 0, 0, $month, $day, $year) + $eventOptions['span'] * 86400);
+
+	$smcFunc['db_query']('', '
+		UPDATE {db_prefix}calendar
+		SET
+			start_date = {date:start_date},
+			end_date = {date:end_date},
+			title = SUBSTRING({string:title}, 1, 60),
+			id_board = {int:id_board},
+			id_topic = {int:id_topic}
+		WHERE id_event = {int:id_event}',
+		array(
+			'start_date' => $eventOptions['start_date'],
+			'end_date' => $eventOptions['end_date'],
+			'title' => $eventOptions['title'],
+			'id_board' => isset($eventOptions['board']) ? (int) $eventOptions['board'] : 0,
+			'id_topic' => isset($eventOptions['topic']) ? (int) $eventOptions['topic'] : 0,
+			'id_event' => $event_id,
+		)
+	);
+
+	updateSettings(array(
+		'calendar_updated' => time(),
+	));
+}
+
+function removeEvent($event_id)
+{
+	global $smcFunc;
+
+	$smcFunc['db_query']('', '
+		DELETE FROM {db_prefix}calendar
+		WHERE id_event = {int:id_event}',
+		array(
+			'id_event' => $event_id,
+		)
+	);
+
+	updateSettings(array(
+		'calendar_updated' => time(),
+	));
+}
+
+function getEventProperties($event_id)
+{
+	global $smcFunc;
+
+	$request = $smcFunc['db_query']('', '
+		SELECT
+			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,
+			t.id_first_msg, t.id_member_started
+		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' => $event_id,
+		)
+	);
+
+	// If nothing returned, we are in poo, poo.
+	if ($smcFunc['db_num_rows']($request) === 0)
+		return false;
+
+	$row = $smcFunc['db_fetch_assoc']($request);
+	$smcFunc['db_free_result']($request);
+
+	$return_value = array(
+		'boards' => array(),
+		'board' => $row['id_board'],
+		'new' => 0,
+		'eventid' => $event_id,
+		'year' => $row['year'],
+		'month' => $row['month'],
+		'day' => $row['day'],
+		'title' => $row['title'],
+		'span' => 1 + $row['span'],
+		'member' => $row['id_member'],
+		'topic' => array(
+			'id' => $row['id_topic'],
+			'member_started' => $row['id_member_started'],
+			'first_msg' => $row['id_first_msg'],
+		),
+	);
+
+	$return_value['last_day'] = (int) strftime('%d', mktime(0, 0, 0, $return_value['month'] == 12 ? 1 : $return_value['month'] + 1, 0, $return_value['month'] == 12 ? $return_value['year'] + 1 : $return_value['year']));
+
+	return $return_value;
+}
+
+function list_getHolidays($start, $items_per_page, $sort)
+{
+	global $smcFunc;
+
+	$request = $smcFunc['db_query']('', '
+		SELECT id_holiday, YEAR(event_date) AS year, MONTH(event_date) AS month, DAYOFMONTH(event_date) AS day, title
+		FROM {db_prefix}calendar_holidays
+		ORDER BY {raw:sort}
+		LIMIT ' . $start . ', ' . $items_per_page,
+		array(
+			'sort' => $sort,
+		)
+	);
+	$holidays = array();
+	while ($row = $smcFunc['db_fetch_assoc']($request))
+		$holidays[] = $row;
+	$smcFunc['db_free_result']($request);
+
+	return $holidays;
+}
+
+function list_getNumHolidays()
+{
+	global $smcFunc;
+
+	$request = $smcFunc['db_query']('', '
+		SELECT COUNT(*)
+		FROM {db_prefix}calendar_holidays',
+		array(
+		)
+	);
+	list($num_items) = $smcFunc['db_fetch_row']($request);
+	$smcFunc['db_free_result']($request);
+
+	return $num_items;
+}
+
+function removeHolidays($holiday_ids)
+{
+	global $smcFunc;
+
+	$smcFunc['db_query']('', '
+		DELETE FROM {db_prefix}calendar_holidays
+		WHERE id_holiday IN ({array_int:id_holiday})',
+		array(
+			'id_holiday' => $holiday_ids,
+		)
+	);
+
+	updateSettings(array(
+		'calendar_updated' => time(),
+	));
+}
+
+?>
\ No newline at end of file