<?php

/**
 * Observium
 *
 *   This file is part of Observium.
 *
 * @package    observium
 * @subpackage graphs
 * @copyright  (C) 2006-2013 Adam Armstrong, (C) 2013-2016 Observium Limited
 *
 */

// Dear Tobias. You write in Perl, this makes me hate you forever.
// This is my translation of Smokeping's graphing.
// Thanks to Bill Fenner for Perl->Human translation:>

$scale_min = 0;
$scale_rigid = TRUE;

include_once($config['html_dir']."/includes/graphs/common.inc.php");
include("smokeping_common.inc.php");

$i = 0;
$pings = 20;
$interval = 300;
$description = "100 Bytes";
if (isset($config['smokeping']['pings'])) {$pings = $config['smokeping']['pings'];}                 # matt.ayre: allow user config to annotate correct
if (isset($config['smokeping']['interval'])) {$interval = $config['smokeping']['interval'];}        # number of pings, interval duration (s) and
if (isset($config['smokeping']['description'])) {$description = $config['smokeping']['description'];} # description (ie size and DSCP marking)
$iter = 0;
$colourset = "mixed";

if($width > "500")
{
  $descr_len = 25;
} else {
  $descr_len = 12 + round(($width - 275) / 8);
}

// FIXME str_pad really needs a "limit to length" so we can rid of all the substrs all over the code to limit the length as below...
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'";
}

$p = $pings;                # matt.ayre set up new constants
$swidth = 0.0001;

$lc =  array(
    0          => ['0',   '#26ff00'],
    1          => ["1/$p",  '#00b8ff'],
    2          => ["2/$p",  '#0059ff'],
    3          => ["3/$p",  '#5e00ff'],
    4          => ["4/$p",  '#7e00ff'],
    intval($p/2)  => [intval($p/2)."/$p", '#dd00ff'],
    $p-1       => [($p-1)."/$p",    '#ff0000'],
);

foreach ($smokeping_files[$direction][$device['hostname']] as $source => $filename)
{

  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 ";
  $rrd_options .= " CDEF:dm$i=median$i";                            # matt.ayre: removed trailing ",UN,0,median$i,IF" to fix red drop lines at the end of smokeping graphs
  $rrd_options .= " DEF:loss$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";

  $dm_list .= ",dm$i,+";
  $sd_list .= ",s2d$i,+";
  $ploss_list .= ",ploss$i,+";

  
  ksort($lc);                               # matt.ayre: begin section for new CDEF/AREA/STACK for line and background colour
  $last = -1;
  foreach ($lc as $loss => $lc_loss) {
      $lvar = intval($loss);
  
      $swidth = 0.0001;
      $bg_trans = "60";
      if ($loss == 0) {
          $bg_trans = "00";
          $swidth = 0.0001;
      }
  
      // line and legend (@median)
      $rrd_options .= " CDEF:me$lvar=loss$i,$last,GT,loss$i,$loss,LE,*,1,UNKN,IF,median$i,*";
      $rrd_options .= " CDEF:meL$lvar=me$lvar,$swidth,-";
      $rrd_options .= " CDEF:meH$lvar=me$lvar,$i,*,$swidth,2,*,+";
      $rrd_options_lc .= " AREA:meL$lvar";
      $rrd_options_lc .= " STACK:meH$lvar$lc_loss[1]:$lc_loss[0]";
  
      // background (@lossargs)
      $rrd_options .= " CDEF:lossbg$lvar=loss$i,$last,GT,loss$i,$loss,LE,*,INF,UNKN,IF";
      $rrd_options_bg .= " AREA:lossbg$lvar$lc_loss[1]$bg_trans";
  
      $last = $loss;
  }

  $i++;

}

$descr = rrdtool_escape("Average", $descr_len);

$rrd_options .= " CDEF:ploss_all=0".$ploss_list.",$i,/";
$rrd_options .= " CDEF:dm_all=0".$dm_list.",$i,/";
#  $rrd_options .= " CDEF:dm_all_clean=dm_all,UN,NaN,dm_all,IF";
$rrd_options .= " CDEF:sd_all=0".$sd_list.",$i,/";
$rrd_options .= " CDEF:dmlow_all=dm_all,sd_all,2,/,-";

$rrd_options .= " AREA:dmlow_all";
$rrd_options .= " AREA:sd_all#AAAAAA::STACK";
$rrd_options .= " LINE1:dm_all#CC0000:'$descr'";

$rrd_options .= " VDEF:avmed=dm_all,AVERAGE";
$rrd_options .= " VDEF:avsd=sd_all,AVERAGE";
$rrd_options .= " CDEF:msr=dm_all,POP,avmed,avsd,/";
$rrd_options .= " VDEF:avmsr=msr,AVERAGE";

$rrd_options .= " GPRINT:avmed:'%5.1lf%ss'";
$rrd_options .= " GPRINT:ploss_all:AVERAGE:'%5.3lf%%'";
$rrd_options .= " GPRINT:avsd:'%5.1lf%Ss'";
$rrd_options .= " GPRINT:avmsr:'%5.1lf%s\\l'";

$rrd_options .= " COMMENT:' \l'";                   # matt.ayre: legend loss thresholds
$rrd_options .= " COMMENT:'loss color\:'";

$rrd_options .= $rrd_options_lc;
$rrd_options .= $rrd_options_bg;

$rrd_options .= " COMMENT:'\l'";                    # matt.ayre: annotation showing smokeping parameters
$rrd_options .= " COMMENT:'probes\:\t$pings ICMP Echo Pings ($description) every ${interval}s\l'";
 

?>