<?php
if ( canEdit('Monitors') ) {
    switch ( $_REQUEST['action'] ) {
      case 'sort' :
        {
          $monitor_ids = $_POST['monitor_ids'];
          # Two concurrent sorts could generate odd sortings... so lock the table.
          global $dbConn;
          $dbConn->beginTransaction();
          $dbConn->exec('LOCK TABLES Monitors WRITE');
          for ( $i = 0; $i < count($monitor_ids); $i += 1 ) {
            $monitor_id = $monitor_ids[$i];
            $monitor_id = preg_replace( '/^monitor_id-/', '', $monitor_id );
            if ( ( ! $monitor_id ) or ! ( is_integer( $monitor_id ) or ctype_digit( $monitor_id ) ) ) {
              Warning("Got $monitor_id from " . $monitor_ids[$i]);
              continue;
            }
            dbQuery('UPDATE Monitors SET Sequence=? WHERE Id=?', array($i, $monitor_id));
          } // end for each monitor_id
          $dbConn->commit();
          $dbConn->exec('UNLOCK TABLES');
        
          return;
      } // end case sort
      default:
      {
        ZM\Warning('unknown action ' . $_REQUEST['action']);
      } // end ddcase default
    }
} else {
  ZM\Warning('Cannot edit monitors');
}

ajaxError('Unrecognised action or insufficient permissions');
?>