Merging and Deleting Sessions

Torque sometimes crashes, leading to fragmented sessions.
These can now be merged.
Unnecessary sessions can be deleted.
TODO: Find an elegant way to clean up those <60 data points sessions.

web/del_session.php

@@ -0,0 +1,25 @@
+<?php
+require_once("./creds.php");
+
+session_start();
+
+if (isset($_POST["deletesession"])) {
+    $deletesession = preg_replace('/\D/', '', $_POST['deletesession']);
+}
+elseif (isset($_GET["deletesession"])) {
+    $deletesession = preg_replace('/\D/', '', $_GET['deletesession']);
+}
+
+if (isset($deletesession) && !empty($deletesession)) {
+    // Connect to Database
+    $con = mysql_connect($db_host, $db_user, $db_pass) or die(mysql_error());
+    mysql_select_db($db_name, $con) or die(mysql_error());
+
+    $delresult = mysql_query("DELETE FROM $db_table
+                          WHERE session=$deletesession;", $con) or die(mysql_error());
+
+    mysql_free_result($delresult);
+    mysql_close($con);
+}
+
+?>

web/merge_sessions.php

@@ -0,0 +1,44 @@
+<?php
+require_once("./creds.php");
+require_once("./get_sessions.php");
+
+session_start();
+
+if (isset($_POST["mergesession"])) {
+    $mergesession = preg_replace('/\D/', '', $_POST['mergesession']);
+}
+elseif (isset($_GET["mergesession"])) {
+    $mergesession = preg_replace('/\D/', '', $_GET['mergesession']);
+}
+
+if (isset($_POST["mergesessionwith"])) {
+    $mergesessionwith = preg_replace('/\D/', '', $_POST['mergesessionwith']);
+}
+elseif (isset($_GET["mergesessionwith"])) {
+    $mergesessionwith = preg_replace('/\D/', '', $_GET['mergesessionwith']);
+}
+
+if (isset($mergesession) && !empty($mergesession) && isset($mergesessionwith) && !empty($mergesessionwith) ) {
+    //Sessions to be merged must be direct neighbors. 'With' must be younger, thus have a lower array index in $sids
+    $idx1 = array_search( $mergesession, $sids);
+    $idx2 = array_search( $mergesessionwith, $sids);
+    if($idx1 != ($idx2+1)) {
+        die("Invalid sessions to be merged. Aborted.");
+    }
+
+    // Connect to Database
+    $con = mysql_connect($db_host, $db_user, $db_pass) or die(mysql_error());
+    mysql_select_db($db_name, $con) or die(mysql_error());
+
+    $mergeresult = mysql_query("UPDATE $db_table
+                          SET session=$mergesession
+                          WHERE session=$mergesessionwith;", $con) or die(mysql_error());
+
+    mysql_free_result($mergeresult);
+    mysql_close($con);
+
+    //Show merged session
+    $session_id = $mergesession;
+}
+
+?>

web/session.php

@@ -4,6 +4,8 @@
 require_once ("./creds.php");
 require_once ("./auth_user.php");
 
+require_once ("./del_session.php");
+require_once ("./merge_sessions.php");
 require_once ("./get_sessions.php");
 require_once ("./get_columns.php");
 require_once ("./plot.php");
@@ -23,6 +25,14 @@
 
 if (isset($session_id)) {
 
+    //For the merge function, we need to find out, what would be the next session
+    $idx = array_search( $session_id, $sids);
+    if($idx>0) {
+        $session_id_next = $sids[$idx-1];
+    } else {
+        $session_id_next = false;
+    }
+
     // Get GPS data for session
     $sessionqry = mysql_query("SELECT kff1006, kff1005
                           FROM $db_table
@@ -292,7 +302,38 @@ function doPlot(position) {
                           </select>
                           <noscript><input type="submit" id="seshidtag" name="seshidtag" class="input-sm"></noscript>
                         </form>
+
+
+<?php if(isset($session_id) && !empty($session_id)){ ?>
+                        <div class="btn-group btn-group-justified">
+                          <table style="width:100%"><tr>
+                            <td><form method="post" class="form-horizontal" role="form" action="session.php?mergesession=<?php echo $session_id; ?>&mergesessionwith=<?php echo $session_id_next; ?>" id="formmerge">
+                              <div align="center" style="padding-top:6px;"><input class="btn btn-info btn-sm" type="submit" id="formmerge" name="merge" value="Merge" title="Merge this session (<?php echo $seshdates[$session_id]; ?>) with the next session (<?php echo $seshdates[$session_id_next]; ?>)." <?php if(!$session_id_next){ echo 'disabled="disabled"';} ?> /></div>
+                            </form></td>
+                            <script type="text/javascript">
+                              //Adding a confirmation dialog to above forms
+                              $('#formmerge').submit(function() {
+                                var c = confirm("Click OK to merge sessions (<?php echo $seshdates[$session_id]; ?>) and (<?php echo $seshdates[$session_id_next]; ?>).");
+                                return c; //you can just return c because it will be true or false
+                              });
+                            </script>
+
+                            <td><form method="post" class="form-horizontal" role="form" action="session.php?deletesession=<?php echo $session_id; ?>" id="formdelete">
+                              <div align="center" style="padding-top:6px;"><input class="btn btn-info btn-sm" type="submit" id="formdelete" name="delete" value="Delete" title="Delete this session (<?php echo $seshdates[$session_id]; ?>)." /></div>
+                            </form></td>
+                            <script type="text/javascript">
+                              $('#formdelete').submit(function() {
+                                var c = confirm("Click OK to delete session (<?php echo $seshdates[$session_id]; ?>).");
+                                return c; //you can just return c because it will be true or false
+                              });
+                            </script>
+                          </tr></table>
                     </div>
+<?php } /* END: if(isset($session_id) && !empty($session_id)) */?>
+
+
+                    </div> <!-- END: Select Session -->
+
 
                     <br>