From 4088b81c5c871de9872c5dd55da818b08c409bd7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Lehrke?= <jlehrke@noc.de>
Date: Thu, 19 Nov 2009 10:13:17 +0000
Subject: [PATCH] Impoved support for recurrences if device timezone differs
 from event timezone

---
 calendar/inc/class.calendar_ical.inc.php | 41 +++++++----------------
 calendar/inc/class.calendar_so.inc.php   | 42 +++++++++++++++++++++---
 2 files changed, 49 insertions(+), 34 deletions(-)

diff --git a/calendar/inc/class.calendar_ical.inc.php b/calendar/inc/class.calendar_ical.inc.php
index ae0b8f1580..668ce732c4 100644
--- a/calendar/inc/class.calendar_ical.inc.php
+++ b/calendar/inc/class.calendar_ical.inc.php
@@ -100,6 +100,13 @@ class calendar_ical extends calendar_boupdate
 	 */
 	var $tzid = null;
 
+	/**
+	 * Cached timezone data
+	 *
+	 * @var array id => data
+	 */
+	protected static $tz_cache = array();
+
 	/**
 	 * Device CTCap Properties
 	 *
@@ -384,30 +391,8 @@ class calendar_ical extends calendar_boupdate
 						// dont use "virtual" exceptions created by participant status for GroupDAV or file export
 						if (!in_array($this->productManufacturer,array('file','groupdav')))
 						{
-							$participants = $this->so->get_participants($event['id'], 0);
-
-							// Check if the stati for all participants are identical for all recurrences
-							foreach ($participants as $uid => $attendee)
-							{
-								switch ($attendee['type'])
-								{
-									case 'u':	// account
-									case 'c':	// contact
-									case 'e':	// email address
-										$recurrences = $this->so->get_recurrences($event['id'], $uid);
-										foreach ($recurrences as $rdate => $recur_status)
-										{
-											if ($rdate && $recur_status != $recurrences[0])
-											{
-												// Every distinct status results in an exception
-												$days[] = $rdate;
-											}
-										}
-										break;
-									default: // We don't handle the rest
-										break;
-								}
-							}
+							$tz_id = ($tzid != $event['tzid'] ? $tzid : null);
+							$days = $this->so->get_recurrence_exceptions($event, $tz_id);
 						}
 						if (is_array($event['recur_exception']))
 						{
@@ -687,13 +672,11 @@ class calendar_ical extends calendar_boupdate
 		{
 			$time = new egw_time($time,egw_time::$server_timezone);
 		}
-		static $timezone;
-		static $timezone_tzid;
-		if (is_null($timezone) || $timezone_tzid != $tzid)
+		if (!isset(self::$tz_cache[$tzid]))
 		{
-			$timezone = calendar_timezones::DateTimeZone($timezone_tzid = $tzid);
+			self::$tz_cache[$tzid] = calendar_timezones::DateTimeZone($tzid);
 		}
-		$time->setTimezone($timezone);
+		$time->setTimezone(self::$tz_cache[$tzid]);
 		$params['TZID'] = $tzid;
 
 		return $time->format('Ymd\THis');
diff --git a/calendar/inc/class.calendar_so.inc.php b/calendar/inc/class.calendar_so.inc.php
index 51942a1344..8f30ec5bee 100644
--- a/calendar/inc/class.calendar_so.inc.php
+++ b/calendar/inc/class.calendar_so.inc.php
@@ -90,6 +90,14 @@ class calendar_so
 	 */
 	const STATUS_SORT = "CASE cal_status WHEN 'U' THEN 1 WHEN 'T' THEN 2 WHEN 'A' THEN 3 WHEN 'R' THEN 4 ELSE 0 END ASC";
 
+	/**
+	 * Cached timezone data
+	 *
+	 * @var array id => data
+	 */
+	protected static $tz_cache = array();
+
+
 	/**
 	 * Constructor of the socal class
 	 */
@@ -1433,16 +1441,30 @@ ORDER BY cal_user_type, cal_usre_id
 	 * Gets the exception days of a given recurring event caused by
 	 * irregular participant stati
 	 *
-	 * @param array $event	Recurring Event.
+	 * @param array $event			Recurring Event.
+	 * @param string tz_id=null		timezone for exports (null for event's timezone)
 	 *
 	 * @return array		Array of exception days (false for non-recurring events).
 	 */
-	function get_recurrence_exceptions(&$event)
+	function get_recurrence_exceptions(&$event, $tz_id=null)
 	{
 		$cal_id = (int) $event['id'];
 		if (!$cal_id || $event['recur_type'] == MCAL_RECUR_NONE) return false;
 
 		$days = array();
+		$first_start = $recur_start = '';
+
+		if (!empty($tz_id))
+		{
+			// set export timezone
+			if(!isset(self::$tz_cache[$tz_id]))
+			{
+				self::$tz_cache[$tz_id] = calendar_timezones::DateTimeZone($tz_id);
+			}
+			$starttime = new egw_time($event['start'], egw_time::$server_timezone);
+			$starttime->setTimezone(self::$tz_cache[$tz_id]);
+			$first_start = $starttime->format('His');
+		}
 
 		$participants = $this->get_participants($event['id'], 0);
 
@@ -1457,10 +1479,20 @@ ORDER BY cal_user_type, cal_usre_id
 					$recurrences = $this->get_recurrences($event['id'], $uid);
 					foreach ($recurrences as $recur_date => $recur_status)
 					{
-						if ($recur_date && $recur_status != $recurrences[0])
+						if ($recur_date)
 						{
-							// Every distinct status results in an exception
-							$days[] = $recur_date;
+							if (!empty($tz_id))
+							{
+								$time = new egw_time($recur_date, egw_time::$server_timezone);
+								$time->setTimezone(self::$tz_cache[$tz_id]);
+								$recur_start = $time->format('His');
+							}
+							if ($recur_status != $recurrences[0]
+								|| !empty($tz_id) && $first_start != $recur_start)
+							{
+								// Every distinct status or starttime results in an exception
+								$days[] = $recur_date;
+							}
 						}
 					}
 					break;