--- a/calls.json.php
+++ b/calls.json.php
@@ -1,29 +1,51 @@
 <?php
+include('common.inc.php');
+function getSensorValuesByHour($sensorID, $timeFrom, $timeTo) {
+    global $conn;
+    $sth = $conn->prepare( 'select min(call_timestamp) as time, count(*), min(length), max(length), avg(length), stddev(length) from recordings
+            group by tgid, date_trunc(\'hour\', call_timestamp) order by time');
+
+    $sth->execute( Array($sensorID, $timeFrom, $timeTo));
+    return  $sth->fetchAll();
+}
+
+function getSensorValuesByDay($sensorID, $dayFrom, $dayTo) {
+    global $conn;
+    $sth = $conn->prepare('select min(time) as time, min(value), max(value), avg(value), stddev(value) from sensor_values where sensor_id = ?
+            group by sensor_id, date_trunc(\'day\', time) order by time');
+
+    $sth->execute( Array($sensorID));
+    return  $sth->fetchAll();
+}
+function getSensorDataYears($sensorID, $timeFrom, $timeTo) {
+    global $conn;
+    $sth = $conn->prepare("select distinct extract('year' from call_timestamp) as year from recordings where tgid = ? order by year");
+
+    $sth->execute(Array($sensorID));
+    return  $sth->fetchAll();
+}
+
+function getSensorDataMonths($sensorID, $timeFrom, $timeTo) {
+    global $conn;
+    $sth = $conn->prepare("select distinct extract('month' from call_timestamp) as month, extract('year' from call_timestamp) as year from recordings where tgid = ?  order by year, month");
+
+    $sth->execute(Array($sensorID));
+    return  $sth->fetchAll();
+}
+
+function getSensorDataDays($sensorID, $timeFrom, $timeTo) {
+    global $conn;
+    $sth = $conn->prepare("select distinct extract('day' from call_timestamp) as day, extract('month' from call_timestamp) as month, extract('year' from call_timestamp) as year from recordings where tgid = ?  order by year,month,day");
 
 
-function json_graph($sensorID, $timefrom, $timeto) {
-    $values = getSensorValuesByHour($sensorID, $timefrom, $timeto);
-    $label = $sensorID;
-    $data = Array();
-    $tzoffset = $this->get_timezone_offset("UTC");
-    foreach ($values as $value) {
-        $data[] = Array((strtotime($value['time']) + $tzoffset) * 1000, intval($value['avg']));
-    }
-    $this->output
-            ->set_content_type('application/json')
-            ->set_output(json_encode(Array("label" => $label, "data" => $data,
-                        "previous" => Array(
-                            "from" => $timefrom - (24 * 60 * 60),
-                            "to" => $timefrom)
-                        ,
-                        "next" => Array(
-                            "to" => $timeto + (24 * 60 * 60),
-                            "from" => $timeto)
-                            )
-                    ));
+    $sth->execute(Array($sensorID));
+    return  $sth->fetchAll();
 }
-
-function json_data_description($sensorID, $timefrom, $timeto) {
+$action = $_REQUEST['action'];
+    $sensorID = $_REQUEST['tgid'];
+$timefrom = $_REQUEST['from'];
+$timeto = $_REQUEST['to'];
+if ($action = "data_description") {
     $timefrom = strtotime($timefrom);
     $timeto = strtotime($timeto);
     $years = getSensorDataYears($sensorID, $timefrom, $timeto);
@@ -31,8 +53,29 @@
     $months = getSensorDataMonths($sensorID, $timefrom, $timeto);
     $days = getSensorDataDays($sensorID, $timefrom, $timeto);
 
-    return json_encode(Array("years" => $years, "months" => $months, "days" => $days
+    echo json_encode(Array("years" => $years, "months" => $months, "days" => $days
                     ));
+}
+
+
+if ($action = "graph") {
+    $values = getSensorValuesByHour($sensorID, $timefrom, $timeto);
+    $label = $sensorID;
+    $data = Array();
+    $tzoffset = get_timezone_offset("UTC");
+    foreach ($values as $value) {
+        $data[] = Array((strtotime($value['time']) + $tzoffset) * 1000, intval($value['avg']));
+    }
+   echo json_encode(Array("label" => $label, "data" => $data,
+            "previous" => Array(
+                "from" => $timefrom - (24 * 60 * 60),
+                "to" => $timefrom)
+        ,
+            "next" => Array(
+                "to" => $timeto + (24 * 60 * 60),
+                "from" => $timeto)
+        )
+    );
 }
 
 ?>