<?php
   $cputemp = NULL;
   $cpufreq = NULL;
   if (file_exists ("/sys/class/thermal/thermal_zone0/temp")) {
      exec("cat /sys/class/thermal/thermal_zone0/temp", $cputemp);
      $cputemp = $cputemp[0] / 1000;
   }
   showLapTime("cputemp");
   if (file_exists ("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq")) {
      exec("cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", $cpufreq);
      $cpufreq = $cpufreq[0] / 1000;
   }
   showLapTime("cpufreq");

   if (defined("TEMPERATUREALERT") && $cputemp > TEMPERATUREHIGHLEVEL && $cputemp !== NULL) {
?>
      <script>
         function deleteLayer(id) {
            if (document.getElementById && document.getElementById(id)) {
               var theNode = document.getElementById(id);
               theNode.parentNode.removeChild(theNode);
            }
            else if (document.all && document.all[id]) {
               document.all[id].innerHTML='';
               document.all[id].outerHTML='';
            }
            // OBSOLETE CODE FOR NETSCAPE 4
            else if (document.layers && document.layers[id]) {
               document.layers[id].visibility='hide';
               delete document.layers[id];
            }
         }

         function makeLayer(id,L,T,W,H,bgColor,visible,zIndex) {
            if (document.getElementById) {
               if (document.getElementById(id)) {
                  alert ('Layer with this ID already exists!');
                  return;
               }
               var ST = 'position:absolute; text-align:center;padding-top:20px;'
               +'; left:'+L+'px'
               +'; top:'+T+'px'
               +'; width:'+W+'px'
               +'; height:'+H+'px'
               +'; clip:rect(0,'+W+','+H+',0)'
               +'; visibility:'
               +(null==visible || 1==visible ? 'visible':'hidden')
               +(null==zIndex  ? '' : '; z-index:'+zIndex)
               +(null==bgColor ? '' : '; background-color:'+bgColor);

               var LR = '<DIV id='+id+' style="'+ST+'">CPU-Temperature is very high!<br><input type="button" value="Close" onclick="deleteLayer(\'LYR1\')"></DIV>';

               if (document.body) {
                  if (document.body.insertAdjacentHTML)
                     document.body.insertAdjacentHTML("BeforeEnd",LR);
                  else if (document.createElement && document.body.appendChild) {
                     var newNode = document.createElement('div');
                     newNode.setAttribute('id',id);
                     newNode.setAttribute('style',ST);
                     document.body.appendChild(newNode);
                  }
               }
            }
         }
         var audio = new Audio('sounds/alert.mp3');
         audio.play();
         var x = window.innerWidth/2-100;
         var y = window.innerHeight/2-50;

         makeLayer('LYR1',x,y,200,100,'red',1,1);
      </script>
<?php
   }

   $output = shell_exec('cat /proc/loadavg');
   $sysload = substr($output,0,strpos($output," "))*100;
   showLapTime("sysload");
   $stat1 = file('/proc/stat');
   sleep(1);
   $stat2 = file('/proc/stat');
   $info1 = explode(" ", preg_replace("!cpu +!", "", $stat1[0]));
   $info2 = explode(" ", preg_replace("!cpu +!", "", $stat2[0]));
   $dif = array();
   $dif['user'] = $info2[0] - $info1[0];
   $dif['nice'] = $info2[1] - $info1[1];
   $dif['sys'] = $info2[2] - $info1[2];
   $dif['idle'] = $info2[3] - $info1[3];
   $total = array_sum($dif);
   $cpu = array();
   foreach($dif as $x=>$y) $cpu[$x] = round($y / $total * 100, 1);
   $cpuusage = round($cpu['user'] + $cpu['sys'], 2);
   showLapTime("cpuusage");

   $output = shell_exec('grep -c processor /proc/cpuinfo');
   $cpucores = $output;

   $output = shell_exec('cat /proc/uptime');
   $uptime = format_time(substr($output,0,strpos($output," ")));
   $idletime = format_time((substr($output,strpos($output," ")))/$cpucores);
   showLapTime("idletime");

   if (defined("SHOWPOWERSTATE")) {
      $pinStatus = trim(shell_exec("gpio -g read ".POWERONLINEPIN)); // Pin 18
   }
   //returns 0 = low; 1 = high
?>
<div class="panel panel-default">
  <!-- Standard-Panel-Inhalt -->
  <div class="panel-heading">System Info</div>
  <!-- Tabelle -->
   <div class="table-responsive">
      <table id="sysinfo" class="table table-condensed">
         <tbody>
            <tr>
               <?php
               if (defined("SHOWPOWERSTATE")) {
               ?>
               <th>Power</th>
               <?php
               }
               if ($cputemp !== NULL) {
               ?>
               <th>CPU-Temperature</th>
               <?php
               }
               if ($cpufreq !== NULL) {
               ?>
               <th>CPU-Frequency</th>
               <?php
               }
               ?>
               <th>System-Load</th>
               <th>CPU-Usage</th>
               <th>Uptime</th>
               <th>Idle</th>
            </tr>
            <tr class="gatewayinfo">
               <?php
               if (defined("SHOWPOWERSTATE")) {
               ?>
               <td><?php if ($pinStatus == POWERONLINESTATE ) {echo "online";} else {echo "on battery";} ?></td>
               <?php
               }
               if ($cputemp !== NULL) {
               ?>
               <td><?php echo $cputemp; ?> &deg;C</td>
               <?php
               }
               if ($cpufreq !== NULL) {
               ?>
               <td><?php echo $cpufreq; ?> MHz</td>
               <?php
               }
               ?>
               <td><?php echo $sysload; ?> %</td>
               <td>
<?php
   if (defined("SHOWPROGRESSBARS")) {
?>
                  <div class="progress"><div class="progress-bar <?php
      if ($cpuusage < 30)
         echo "progress-bar-success";
      if ($cpuusage >= 30 and $cpuusage < 60)
         echo "progress-bar-warning";
      if ($cpuusage >= 60)
         echo "progress-bar-danger";
?>" role="progressbar" aria-valuenow="<?php echo $cpuusage; ?>" aria-valuemin="0" aria-valuemax="100" style="width: <?php echo $cpuusage; ?>%;"><?php echo $cpuusage; ?>%</div></div>
<?php
   } else {
      echo $cpuusage." %";
   }
?>
               </td>
               <td><?php echo $uptime; ?></td>
               <td><?php echo $idletime; ?></td>
            </tr>
         </tbody>
      </table>
   </div>
</div>