<?php

include_once( 'includes/status_messages.php' );

/**
 *
 * Find the version of the Raspberry Pi
 * Currently only used for the system information page but may useful elsewhere
 *
 */

function RPiVersion() {
  // Lookup table from http://www.raspberrypi-spy.co.uk/2012/09/checking-your-raspberry-pi-board-version/
  $revisions = array(
    '0002' => 'Model B Revision 1.0',
    '0003' => 'Model B Revision 1.0 + ECN0001',
    '0004' => 'Model B Revision 2.0 (256 MB)',
    '0005' => 'Model B Revision 2.0 (256 MB)',
    '0006' => 'Model B Revision 2.0 (256 MB)',
    '0007' => 'Model A',
    '0008' => 'Model A',
    '0009' => 'Model A',
    '000d' => 'Model B Revision 2.0 (512 MB)',
    '000e' => 'Model B Revision 2.0 (512 MB)',
    '000f' => 'Model B Revision 2.0 (512 MB)',
    '0010' => 'Model B+',
    '0013' => 'Model B+',
    '0011' => 'Compute Module',
    '0012' => 'Model A+',
    'a01041' => 'a01041',
    'a21041' => 'a21041',
    '900092' => 'PiZero 1.2',
    '900093' => 'PiZero 1.3',
    '9000c1' => 'PiZero W',
    'a02082' => 'Pi 3 Model B',
    'a22082' => 'Pi 3 Model B',
    'a32082' => 'Pi 3 Model B',
    'a52082' => 'Pi 3 Model B',
    'a020d3' => 'Pi 3 Model B+',
    'a220a0' => 'Compute Module 3',
    'a020a0' => 'Compute Module 3',
    'a02100' => 'Compute Module 3+',
  );

  $cpuinfo_array = '';
  exec('cat /proc/cpuinfo', $cpuinfo_array);
  $rev = trim(array_pop(explode(':',array_pop(preg_grep("/^Revision/", $cpuinfo_array)))));
  if (array_key_exists($rev, $revisions)) {
    return $revisions[$rev];
  } else {
    return 'Unknown Pi';
  }
}

/**
 *
 *
 */
function DisplaySystem(){

  $status = new StatusMessages();

  if( isset($_POST['SaveLanguage']) ) {
    if (CSRFValidate()) {
      if(isset($_POST['locale'])) {
        $_SESSION['locale'] = $_POST['locale'];
        $status->addMessage('Language setting saved', 'success');
      }
    } else {
      error_log('CSRF violation');
    }
  }

  // define locales
  $arrLocales = array(
    'en_GB.UTF-8' => 'English',
    'de_DE.UTF-8' => 'Deutsch',
    'fr_FR.UTF-8' => 'Français',
    'it_IT.UTF-8' => 'Italiano',
    'pt_BR.UTF-8' => 'Português',
    'sv_SE.UTF-8' => 'Svenska',
    'nl_NL.UTF-8' => 'Nederlands',
    'zh_CN.UTF-8' => '简体中文 (Chinese simplified)',
    'cs_CZ.UTF-8' => 'Čeština',
    'ru_RU.UTF-8' => 'Русский',
    'es_MX.UTF-8' => 'Español',
    'fi_FI.UTF-8' => 'Finnish',
    'si_LK.UTF-8' => 'Sinhala'
  );

  // hostname
  exec("hostname -f", $hostarray);
  $hostname = $hostarray[0];

  // uptime
  $uparray = explode(" ", exec("cat /proc/uptime"));
  $seconds = round($uparray[0], 0);
  $minutes = $seconds / 60;
  $hours   = $minutes / 60;
  $days    = floor($hours / 24);
  $hours   = floor($hours   - ($days * 24));
  $minutes = floor($minutes - ($days * 24 * 60) - ($hours * 60));
  $uptime= '';
  if ($days    != 0) { $uptime .= $days    . ' day'    . (($days    > 1)? 's ':' '); }
  if ($hours   != 0) { $uptime .= $hours   . ' hour'   . (($hours   > 1)? 's ':' '); }
  if ($minutes != 0) { $uptime .= $minutes . ' minute' . (($minutes > 1)? 's ':' '); }

  // mem used
  $memused_status = "primary";
  exec("free -m | awk '/Mem:/ { total=$2 ; used=$3 } END { print used/total*100}'", $memarray);
  $memused = floor($memarray[0]);
  if     ($memused > 90) { $memused_status = "danger";  }
  elseif ($memused > 75) { $memused_status = "warning"; }
  elseif ($memused >  0) { $memused_status = "success"; }

  // cpu load
  $cores   = exec("grep -c ^processor /proc/cpuinfo");
  $loadavg = exec("awk '{print $1}' /proc/loadavg");
  $cpuload = floor(($loadavg * 100) / $cores);
  if     ($cpuload > 90) { $cpuload_status = "danger";  }
  elseif ($cpuload > 75) { $cpuload_status = "warning"; }
  elseif ($cpuload >  0) { $cpuload_status = "success"; }

?>
  <div class="row">
  <div class="col-lg-12">
  <div class="panel panel-primary">
  <div class="panel-heading"><i class="fa fa-cube fa-fw"></i> <?php echo _("System"); ?></div>
  <div class="panel-body">

<?php
  if (isset($_POST['system_reboot'])) {
    echo '<div class="alert alert-warning">' . _("System Rebooting Now!") . '</div>';
    $result = shell_exec("sudo /sbin/reboot");
  }
  if (isset($_POST['system_shutdown'])) {
    echo '<div class="alert alert-warning">' . _("System Shutting Down Now!") . '</div>';
    $result = shell_exec("sudo /sbin/shutdown -h now");
  }
?>

  <div class="row">
  <div class="col-md-12">
  <div class="panel panel-default">
  <div class="panel-body">
  <p><?php $status->showMessages(); ?></p>
  <form role="form" action="?page=system_info" method="POST">
  <ul class="nav nav-tabs" role="tablist">
    <li role="presentation" class="active systemtab"><a href="#system" aria-controls="system" role="tab" data-toggle="tab"><?php echo _("System"); ?></a></li>
    <li role="presentation" class="languagetab"><a href="#language" aria-controls="language" role="tab" data-toggle="tab"><?php echo _("Language"); ?></a></li>
    <li role="presentation" class="consoletab"><a href="#console" aria-controls="console" role="tab" data-toggle="tab"><?php echo _("Console"); ?></a></li>
  </ul>

  <div class="systemtabcontent tab-content">
    <div role="tabpanel" class="tab-pane active" id="system">
      <div class="row">
        <div class="col-lg-6">
          <h4><?php echo _("System Information"); ?></h4>
          <div class="info-item"><?php echo _("Hostname"); ?></div> <?php echo htmlspecialchars($hostname, ENT_QUOTES); ?></br>
          <div class="info-item"><?php echo _("Pi Revision"); ?></div> <?php echo htmlspecialchars(RPiVersion(), ENT_QUOTES); ?></br>
          <div class="info-item"><?php echo _("Uptime"); ?></div>   <?php echo htmlspecialchars($uptime, ENT_QUOTES); ?></br></br>
          <div class="info-item"><?php echo _("Memory Used"); ?></div>
          <div class="progress">
          <div class="progress-bar progress-bar-<?php echo htmlspecialchars($memused_status, ENT_QUOTES); ?> progress-bar-striped active"
          role="progressbar"
          aria-valuenow="<?php echo htmlspecialchars($memused, ENT_QUOTES); ?>" aria-valuemin="0" aria-valuemax="100"
          style="width: <?php echo htmlspecialchars($memused, ENT_QUOTES); ?>%;"><?php echo htmlspecialchars($memused, ENT_QUOTES); ?>%
          </div>
          </div>
          <div class="info-item"><?php echo _("CPU Load"); ?></div>
          <div class="progress">
          <div class="progress-bar progress-bar-<?php echo htmlspecialchars($cpuload_status, ENT_QUOTES); ?> progress-bar-striped active"
          role="progressbar"
          aria-valuenow="<?php echo htmlspecialchars($cpuload, ENT_QUOTES); ?>" aria-valuemin="0" aria-valuemax="100"
          style="width: <?php echo htmlspecialchars($cpuload, ENT_QUOTES); ?>%;"><?php echo htmlspecialchars($cpuload, ENT_QUOTES); ?>%
          </div>
          </div>

          <form action="?page=system_info" method="POST">
          <input type="submit" class="btn btn-warning" name="system_reboot"   value="<?php echo _("Reboot"); ?>" />
          <input type="submit" class="btn btn-warning" name="system_shutdown" value="<?php echo _("Shutdown"); ?>" />
          <input type="button" class="btn btn-outline btn-primary" value="<?php echo _("Refresh"); ?>" onclick="document.location.reload(true)" />
          </form>
          <h5><strong><?php echo _("Your development support is greatly appreciated: Developer Loki Address"); ?></strong></h5>
          <h5><strong><pre><?php echo _("LA8VDcoJgiv2bSiVqyaT6hJ67LXbnQGpf9Uk3zh9ikUKPJUWeYbgsd9gxQ5ptM2hQNSsCaRETQ3GM9FLDe7BGqcm4ve69bh"); ?></pre></strong></h5>

        </div>
      </div>
    </div>

    <div role="tabpanel" class="tab-pane" id="language">
      <h4><?php echo _("Language settings") ;?></h4>
      <?php CSRFToken() ?>
      <div class="row">
        <div class="form-group col-md-4">
          <label for="code"><?php echo _("Select a language"); ?></label>
            <?php SelectorOptions('locale', $arrLocales, $_SESSION['locale']); ?>
        </div>
      </div>
      <input type="submit" class="btn btn-outline btn-primary" name="SaveLanguage" value="<?php echo _("Save settings"); ?>" />
      <input type="button" class="btn btn-outline btn-primary" value="<?php echo _("Refresh"); ?>" onclick="document.location.reload(true)" />
    </div>

    <div role="tabpanel" class="tab-pane" id="console">
      <div class="row">
        <div class="col-lg-12">
          <iframe src="includes/webconsole.php" class="webconsole"></iframe>
        </div>
      </div>
    </div>

    </div><!-- /.systemtabcontent -->

    </div><!-- /.panel-default -->
    </div><!-- /.col-md-6 -->
    </div><!-- /.row -->
  </div><!-- /.panel-body -->
  </form>
  </div><!-- /.panel-primary -->
  <div class="panel-footer"></div>
  </div><!-- /.panel-primary -->
  </div><!-- /.col-lg-12 -->
  </div><!-- /.row -->
<?php
}
