#!/usr/bin/perl -w

# Temperature read from hplog -t
# in the plugin config the user need to be set to root:
#
# [hp_temp]
# user root

use strict;
use Munin::Plugin;

my $mode = ($ARGV[0] or "print");

if ($mode eq 'autoconf')
{
	if (`/sbin/hplog -t` eq '')
	{
		print "no (no temperature devices to monitor)\n"
	}
	else
	{
		print "yes\n"
	}
	exit 0;
}

if ($mode eq 'config')
{
	# headers for the temperature
	print "graph_title HP Temperature sensors in Celsius\n";
	print "graph_args --base 1000 -l 0\n";
	print "graph_vlabel degrees Celsius\n";
	print "graph_category sensors\n";
}

# threshold: ($name).critical
# ($name).warning -5% of threshold

open(HPT, "hplog -t 2>/dev/null |") || die("Cannot open hplog: $!\n");
<HPT>; # header line, skipping
while (<HPT>)
{
	# we need the following locations (fixed)
	# ID: 1-2
	# LOCATION: 18-32
	# STATUS: 34-42
	# CURRENT: 43-52
	# THRESHOLD: (for init only) 53-62
	chomp;
	if (length($_) > 1)
	{
		my $status = substr($_, 33, 8); # Normal, Absent, etc
		$status =~ s/\s+$//g;
		# if status is not Abstent, we go ahead
		if ($status ne 'Absent')
		{
			my $id = substr($_, 0, 2);
			$id =~ s/\s+//g;
			my $location = substr($_, 17, 14);
			# strip any trailing spaces
			$location =~ s/\s+$//g;
			$location .= ' '.$id;
			my $temp = substr($_, 42, 9);
			# post work: current extract C number only
			$temp =~ /\dF\/([\d ]{3})C$/;
			$temp = $1;
			if ($temp)
			{
				$temp =~ s/\s+//g;
				# create a unique name from location
				# remove all . / ( ) and replace space with _
				my $name = lc($location);
				$name =~ s/[\.\/\(\)]//g;
				# strip all trailing spaces
				$name =~ s/\s+$//g;
				# convert spaces left to underscore
				$name =~ s/\ /_/g;
				# add the ID to be 100% unique
				$name .= '_'.$id;

				if ($mode eq 'config')
				{
					# only needed here in config
					my $threshold = substr($_, 52, 9);
					# extract only C
					$threshold =~ /\dF\/([\d ]{3})C$/;
					$threshold = $1;
					if ($threshold)
					{
						$threshold =~ s/\s+//g;
					}
					else
					{
						$threshold = 100;
					}
					# calc warning from threshold, 5% less
					my $warning = sprintf("%.0f", $threshold * 95 / 100);

					print $name.".label ".$location."\n";
					print $name.".warning ".$warning."\n";
					print $name.".critical ".$threshold."\n";
				}
				else
				{
					print $name.".value ".$temp."\n";
				}
			}
		}
	}
}
close(HPT);