diff --git a/index.php b/index.php
index 43e4058..31b5305 100644
--- a/index.php
+++ b/index.php
@@ -2,18 +2,19 @@
 require_once 'google-api/Google_Client.php';
 require_once 'google-api/contrib/Google_CalendarService.php';
 
+error_reporting(E_ALL);
 session_start();
 
 $client = new Google_Client();
-$client->setApplicationName("Google Calendar PHP Starter Application");
+$client->setApplicationName("aLAZYsis");
 
 // Visit https://code.google.com/apis/console?api=calendar to generate your
 // client id, client secret, and to register your redirect uri.
 $client->setClientId('881243075742.apps.googleusercontent.com');
 $client->setClientSecret('xBRiQQeDPjBF1hR6PO71ju0h');
-$client->setRedirectUri('http://www.steffenvogel.de/demos/lazymeter');
+$client->setRedirectUri('http://t0.0l.de/aLAZYsis');
 $client->setDeveloperKey('AIzaSyCgi7GeXk0FQpYgROFnVmd5lG0_t1USM-M');
-$cal = new Google_CalendarService($client);
+$service['cal'] = new Google_CalendarService($client);
 
 if (isset($_GET['logout'])) {
 	unset($_SESSION['token']);
@@ -30,8 +31,9 @@ if (isset($_SESSION['token'])) {
 }
 
 if ($client->getAccessToken()) {
-	$busy = array();
-	$calItems = array();
+	$sum = array('total' => 0);
+	$active = array();
+
 	$calBlacklist = array(
 		"#contacts@group.v.calendar.google.com",
 		"#weeknum@group.v.calendar.google.com",
@@ -40,93 +42,110 @@ if ($client->getAccessToken()) {
 	);
 
 	// filter calendars
-	$calList = array_filter($cal->calendarList->listCalendarList()['items'], function($cal) use ($calBlacklist) {
+	$calList = array_filter($service['cal']->calendarList->listCalendarList()->getItems(), function($cal) {
+		global $calBlacklist;
+		global $sum;
+		global $active;
+
 		foreach ($calBlacklist as $black) {
-			if (strpos($cal['id'], $black) !== false) {
+			if (strpos($cal->getId(), $black) !== false) {
 				return false;
 			}
 		}
 
+		$sum[$cal->getId()] = 0;
+		$active[$cal->getId()] = 0;
+
 		return true;
 	});
 
-	// fetch free/busy times
-	foreach ($calList as $calendar) {
-		$item = new Google_FreeBusyRequestItem();
-		$item->setId($calendar['id']);
-		array_push($calItems, $item);
-	}
-
-	$fbReq = new Google_FreeBusyRequest();
-	$timezone = new DateTimeZone($cal->settings->get('timezone')['value']);
+	// fetch events
+	$timezone = new DateTimeZone($service['cal']->settings->get('timezone')->getValue());
 	$midnight = new DateTime("today", $timezone);
 	$tomorrow = new DateTime("tomorrow", $timezone);
 
-	$fbReq->setTimeMin(date('c', $midnight->getTimestamp()));
-	$fbReq->setTimeMax(date('c', $tomorrow->getTimestamp()));
-	$fbReq->setItems($calItems);
+	$options = array(
+		'timeMin' => date('c', $midnight->getTimestamp()),
+		'timeMax' => date('c', $tomorrow->getTimestamp()),
+		'singleEvents' => true
+	);
 
-	$fb = $cal->freebusy->query($fbReq);
+	// parse & aggregate event list
+	$stack = array();
+	foreach ($calList as $cal) {
+		$pageToken = '';
+		do {
+			$events = $service['cal']->events->listEvents($cal->getId(),
+				($pageToken) ? array('pageToken' => $pageToken) : $options);
 
-	// aggregate free/busy events
-	foreach ($fb['calendars'] as $id => $cal) {
-		array_walk($cal['busy'], function(&$entry) use ($id) {
-			$entry['cal'] = $id;
+			if ($events->getItems()) {
+				foreach ($events->getItems() as $item) {
+					if ($item->getStart()->getDateTime()) {
+						$event['calId'] = $cal->getId();
+						$event['summary'] = $item->getSummary();
 
-			// convert rfc datetime strings to unix timestamps
-			$entry['start_ts'] = new DateTime($entry['start']);
-			$entry['end_ts'] = new DateTime($entry['end']);
-		});
+						$event['action'] = 'start';
+						$event['ts'] = new DateTime($item->getStart()->getDateTime());
+						array_push($stack, $event);
+
+						$event['action'] = 'end';
+						$event['ts'] = new DateTime($item->getEnd()->getDateTime());
+						array_push($stack, $event);
+					}
+				}
+			}
+
+			$pageToken = $events->getNextPageToken();
+		} while ($pageToken);
 
-		$busy = array_merge($busy, $cal['busy']);
 	}
 
-	// filter full-time events
-	$busy = array_filter($busy, function() {
-		return true;
+	// sort according to event start time, then end time
+	usort($stack, function($a, $b) {
+		if ($a['ts'] == $b['ts']) return 0;
+		else return ($a['ts'] < $b['ts']) ? -1 : 1;
 	});
 
-	// sort with start time
-	usort($busy, function($a, $b) {
-		if ($a['start_ts'] == $b['start_ts']) return 0;
-		else return ($a['start_ts'] < $b['start_ts']) ? -1 : 1;
-	});
 
-	$duration = 0;
-	for ($i = 0; $i < count($busy); $i++) {
-		$start = $busy[$i]['start_ts']->getTimestamp();
-		$end = $busy[$i]['end_ts']->getTimestamp();
+	// start analysis
+	for ($i = 0; $i < count($stack); $i++) {
+		$current = $stack[$i];
 
-		for ($j = $i+1; $j < count($busy); $j++) {
-			if ($busy[$j]['start_ts'] <= $end && $busy[$j]['end_ts'] > $end) {
-				echo "found overlap between $i and $j<br/>";
+		if ($i >= 1) {
+			$filtered = array_filter($active);
+			$count = count($filtered);
 
-				$end = $busy[$j]['end_ts'];
-				$i = $j;
+			$prev = $stack[$i-1];
+			$diff = $current['ts']->getTimestamp() - $prev['ts']->getTimestamp();
+
+			foreach (array_keys($filtered) as $calId) {
+				$sum[$calId] += $diff / $count;
+			}
+
+			if ($count > 0) {
+				$sum['total'] += $diff;
 			}
 		}
 
-		$diff = $end - $start;
+		if ($current['action'] == 'start') {
+			$active[$current['calId']]++;
+		}
 
-		echo "adding $i with dur = " . $diff . "<br />";
-
-		$duration += $diff;
+		if ($current['action'] == 'end') {
+			$active[$current['calId']]--;
+		}
 	}
 
-	$sleep = 7*60*60;
-	$awake = $duration - $sleep;
 
-	$percentage = $awake / (24*60*60-$sleep);
+	$json = array();
+	foreach ($sum as $id => $hours) {
+		if ($id == 'total') continue;
 
-	print "<h1>Busy</h1>";
-	print_pre($busy);
-	print "<h1>Result</h1>
-		<ul>
-			<li>duration: " . $duration / 3600 . " hours</li>
-			<li>awake: " . $awake / 3600 . " hours</li>
-			<li>percentage: " . ($percentage*100) . " %</li>
-		</ul>";
+		array_push($json, array($id, $hours/3600));
+	}
 
+	header('Content-Type: application/json');
+	echo json_encode($json);
 
 	$_SESSION['token'] = $client->getAccessToken();
 } else {