<?php

$src = device_by_id_cache($_GET['src']);

// This is my translation of Smokeping's graphing.
// Thanks to Bill Fenner for Perl->Human translation:>
$scale_min   = 0;
$scale_rigid = true;

require 'includes/graphs/common.inc.php';
require 'smokeping_common.inc.php';

$i         = 0;
$pings     = $config['smokeping']['pings'];
$iter      = 0;
$colourset = 'mixed';

if ($width > '500') {
    $descr_len = 18;
}
else {
    $descr_len = (12 + round(($width - 275) / 8));
}

if ($width > '500') {
    $rrd_options .= " COMMENT:'".substr(str_pad($unit_text, ($descr_len + 5)), 0, ($descr_len + 5))." RTT      Loss    SDev   RTT\:SDev                              \l'";
}
else {
    $rrd_options .= " COMMENT:'".substr(str_pad($unit_text, ($descr_len + 5)), 0, ($descr_len + 5))." RTT      Loss    SDev   RTT\:SDev                              \l'";
}

$filename_dir = generate_smokeping_file($device);
if ($src['hostname'] == $config['own_hostname']) {
    $filename = $filename_dir . $device['hostname'].'.rrd';
    if (!file_exists($filename_dir.$device['hostname'].'.rrd')) {
        // Try with dots in hostname replaced by underscores
        $filename = $filename_dir . str_replace('.', '_', $device['hostname']).'.rrd';
    }
}
else {
    $filename = $filename_dir . $device['hostname'] .'~'.$src['hostname'].'.rrd';
    if (!file_exists($filename)) {
        // Try with dots in hostname replaced by underscores
        $filename = $filename_dir . str_replace('.', '-', $device['hostname']) .'~'.$src['hostname'].'.rrd';
    }
}

if (!isset($config['graph_colours'][$colourset][$iter])) {
    $iter = 0;
}

  $colour = $config['graph_colours'][$colourset][$iter];
  $iter++;

  $descr = rrdtool_escape($source, $descr_len);

  $rrd_options .= " DEF:median$i=".$filename.':median:AVERAGE ';
  $rrd_options .= " DEF:loss$i=".$filename.':loss:AVERAGE';
  $rrd_options .= " CDEF:ploss$i=loss$i,$pings,/,100,*";
  $rrd_options .= " CDEF:dm$i=median$i";
// $rrd_options .= " CDEF:dm$i=median$i,0,".$max->{$start}.",LIMIT";
  // start emulate Smokeping::calc_stddev
foreach (range(1, $pings) as $p) {
    $rrd_options .= ' DEF:pin'.$i.'p'.$p.'='.$filename.':ping'.$p.':AVERAGE';
    $rrd_options .= ' CDEF:p'.$i.'p'.$p.'=pin'.$i.'p'.$p.',UN,0,pin'.$i.'p'.$p.',IF';
}

  unset($pings_options, $m_options, $sdev_options);

foreach (range(2, $pings) as $p) {
    $pings_options .= ',p'.$i.'p'.$p.',UN,+';
    $m_options     .= ',p'.$i.'p'.$p.',+';
    $sdev_options  .= ',p'.$i.'p'.$p.',m'.$i.',-,DUP,*,+';
}

  $rrd_options .= ' CDEF:pings'.$i.'='.$pings.',p'.$i.'p1,UN'.$pings_options.',-';
  $rrd_options .= ' CDEF:m'.$i.'=p'.$i.'p1'.$m_options.',pings'.$i.',/';
  $rrd_options .= ' CDEF:sdev'.$i.'=p'.$i.'p1,m'.$i.',-,DUP,*'.$sdev_options.',pings'.$i.',/,SQRT';
  // end emulate Smokeping::calc_stddev
  $rrd_options .= " CDEF:dmlow$i=dm$i,sdev$i,2,/,-";
  $rrd_options .= " CDEF:s2d$i=sdev$i";
  $rrd_options .= " AREA:dmlow$i";
  $rrd_options .= " AREA:s2d$i#".$colour.'30::STACK';
  $rrd_options .= " LINE1:dm$i#".$colour.":'$descr'";

// $rrd_options .= " LINE1:sdev$i#000000:$descr";
  $rrd_options .= " VDEF:avmed$i=median$i,AVERAGE";
  $rrd_options .= " VDEF:avsd$i=sdev$i,AVERAGE";
  $rrd_options .= " CDEF:msr$i=median$i,POP,avmed$i,avsd$i,/";
  $rrd_options .= " VDEF:avmsr$i=msr$i,AVERAGE";

  $rrd_options .= " GPRINT:avmed$i:'%5.1lf%ss'";
  $rrd_options .= " GPRINT:ploss$i:AVERAGE:'%5.1lf%%'";

  $rrd_options .= " GPRINT:avsd$i:'%5.1lf%Ss'";
  $rrd_options .= " GPRINT:avmsr$i:'%5.1lf%s\\l'";

  $i++;