#!/usr/bin/perl -w
# -*- perl -*-

=head1 NAME

acpi_batt_ - monitor the (note|net)book battery states through procfs

=head1 APPLICABLE SYSTEMS

Notebooks and netbooks with available /proc/acpi/battery

=head1 CONFIGURATION

The name of the plugin (or its symbolic link) determines the retrieved data.

=over

=item acpi_batt_X_capacity: chart of Design capacity, Last full capacity, Design capacity low, Design capacity warning, Capacity granularity 1, Capacity granularity 2, Remaining capacity, Present rate (mA)

=item acpi_batt_X_percents: percentage chart of Current voltage, Current capacity, Full capacity (of design)

=item acpi_batt_X_voltage: chart of Design voltage, Present voltage

=back

Where X is the number of battery from /proc/acpi/battery/BATX

=head1 INTERPRETATION

The plugin shows:

=over

=item Design capacity

=item Last full capacity

=item Design capacity low

=item Design capacity warning

=item Capacity granularity 1

=item Capacity granularity 2

=item Remaining capacity

=item Present rate (mA)

=item Percentage Current/design voltage

=item Percentage Full/current capacity

=item Percentage Design/full capacity

=item Design voltage

=item Present voltage

=back


=head1 MAGIC MARKERS

 #%# family=power

=head1 BUGS

None known.

=head1 AUTHOR

Gorlow Maxim <sheridan@sheridan-home.ru>

=head1 LICENSE

GPLv2

=cut


use strict;
#use Data::Dumper;

my ($graph_type, $batt_num);
if ($0 =~ /^(?:|.*\/)acpi_batt_([^_]+)_(.+)$/)
{
    $graph_type = $2;
    $batt_num = $1;
}
elsif (!defined($batt_num) or !defined($graph_type)) {
    die "# Error: couldn't understand what I'm supposed to monitor."; }

#print "$batt_num, $graph_type \n";

sub trim
{
	my($string)=@_;
	for ($string)
	{
		s/^\s+//;
		s/\s+$//;
	}
	return $string;
}


sub read_data
{
	my $file = $_[0];
	my ($fh, $var, $val);
	my @tmp;
	my $result = {};
	open($fh, '<', "/proc/acpi/battery/BAT${batt_num}/${file}") or die $!;
	foreach my $line (<$fh>)
	{
		chomp ($line);
		($var, $val) = split(':', $line);
		if ( $val =~ m/^\s*$/ )
		{
			$val = "unknown";
		}
		elsif ( $var ne "battery type" or $var ne "serial number" or $var ne "OEM info" )
		{
			@tmp = split(" " ,$val);
			$val = trim($tmp[0]);
		}
		$result->{$var} = $val;
		#print "$var, -$val- \n";
	}
	close($fh);
	return $result;
}

my $batt_data = {};
$batt_data->{'info'}  = read_data("info" );
$batt_data->{'state'} = read_data("state");

#print Dumper($batt_data);

if ($ARGV[0] and $ARGV[0] eq "config")
{
	my $batt_name = sprintf("%s %s %s", $batt_data->{'info'}{'OEM info'}, $batt_data->{'info'}{'battery type'}, $batt_data->{'info'}{'model number'});
	print  ("graph_args --base 1000\n");
	printf ("graph_title Battery %d (%s) %s\n" , $batt_num, $batt_name, $graph_type);
	printf ("graph_info This graph shows battery %d (%s) %s\n" , $batt_num, $batt_name, $graph_type);
	print  ("graph_category sensors\n");
	if ($graph_type eq "capacity")
	{
		print  ("graph_vlabel Capacity, mAh\n");
		print  ("dc.label Design capacity\ndc.type GAUGE\ndc.draw AREA\n");
		print  ("lfc.label Last full capacity\nlfc.type GAUGE\nlfc.draw AREA\n");
		print  ("dcl.label Design capacity low\ndcl.type GAUGE\ndcl.draw LINE2\n");
		print  ("dcw.label Design capacity warning\ndcw.type GAUGE\ndcw.draw LINE2\n");
		print  ("cg1.label Capacity granularity 1\ncg1.type GAUGE\ncg1.draw LINE2\n");
		print  ("cg2.label Capacity granularity 2\ncg2.type GAUGE\ncg2.draw LINE2\n");
		print  ("rc.label Remaining capacity\nrc.type GAUGE\nrc.draw LINE2\n");
		print  ("pr.label Present rate (mA)\npr.type GAUGE\npr.draw LINE2\n");
	}
	elsif ($graph_type eq "voltage")
	{
		print  ("graph_vlabel Voltage, mV\n");
		print  ("d.label Design voltage\nd.type GAUGE\nd.draw AREA\n");
		print  ("p.label Present voltage\np.type GAUGE\np.draw AREA\n");
	}
	elsif ($graph_type eq "percents")
	{
		print  ("graph_vlabel %\n");
		print  ("cv.label Current voltage\ncv.type GAUGE\ncv.draw LINE2\n");
		print  ("cc.label Current capacity\ncc.type GAUGE\ncc.draw LINE2\n");
		print  ("fc.label Full capacity (of design)\nfc.type GAUGE\nfc.draw LINE2\n");
	}
	exit 0;
}

#$batt_data->{'info'}{''}
sub percent
{
	my ($full, $current) = @_[0..1];
	return $current/($full/100);
}

if ($graph_type eq "capacity")
{
	printf ("dc.value %d\n", $batt_data->{'info'}{'design capacity'});
	printf ("lfc.value %d\n", $batt_data->{'info'}{'last full capacity'});
	printf ("dcl.value %d\n", $batt_data->{'info'}{'design capacity low'});
	printf ("dcw.value %d\n", $batt_data->{'info'}{'design capacity warning'});
	printf ("cg1.value %d\n", $batt_data->{'info'}{'capacity granularity 1'});
	printf ("cg2.value %d\n", $batt_data->{'info'}{'capacity granularity 2'});
	printf ("rc.value %d\n", $batt_data->{'state'}{'remaining capacity'});
	printf ("pr.value %d\n", $batt_data->{'state'}{'present rate'});
}
elsif ($graph_type eq "voltage")
{
	printf ("d.value %d\n", $batt_data->{'info'}{'design voltage'});
	printf ("p.value %d\n", $batt_data->{'state'}{'present voltage'});
}
elsif ($graph_type eq "percents")
{
	printf ("cv.value %d\n", percent($batt_data->{'info'}{'design voltage'},$batt_data->{'state'}{'present voltage'}));
	printf ("cc.value %d\n", percent($batt_data->{'info'}{'design capacity'},$batt_data->{'state'}{'remaining capacity'}));
	printf ("fc.value %d\n", percent($batt_data->{'info'}{'design capacity'},$batt_data->{'info'}{'last full capacity'}));
}