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

=head1 NAME

batteries Munin plugin to monitor the battery states through procfs and sysfs

=head1 APPLICABLE SYSTEMS

Systems with available /proc/acpi/battery/BATx or /sys/class/power_supply/BATx

=head1 CONFIGURATION

none

=head1 INTERPRETATION

The plugin shows:
 Design capacity                   -> available if available /proc/acpi/battery/BATx or /sys/class/power_supply/BATx
 Last full capacity                -> available if available /proc/acpi/battery/BATx or /sys/class/power_supply/BATx
 Design capacity low               -> available only if available /proc/acpi/battery/BATx
 Design capacity warning           -> available only if available /proc/acpi/battery/BATx
 Capacity granularity 1            -> available only if available /proc/acpi/battery/BATx
 Capacity granularity 2            -> available only if available /proc/acpi/battery/BATx
 Remaining capacity                -> available if available /proc/acpi/battery/BATx or /sys/class/power_supply/BATx
 Present rate                      -> available if available /proc/acpi/battery/BATx or /sys/class/power_supply/BATx
 Percentage Current/design voltage -> available if available /proc/acpi/battery/BATx or /sys/class/power_supply/BATx
 Percentage Current/full capacity  -> available if available /proc/acpi/battery/BATx or /sys/class/power_supply/BATx
 Percentage Full/design capacity   -> available if available /proc/acpi/battery/BATx or /sys/class/power_supply/BATx
 Design voltage                    -> available if available /proc/acpi/battery/BATx or /sys/class/power_supply/BATx
 Present voltage                   -> available if available /proc/acpi/battery/BATx or /sys/class/power_supply/BATx

=head1 MAGIC MARKERS

 #%# family=power
 #%# capabilities=autoconf

=head1 VERSION

1.0

=head1 BUGS

None known.

=head1 AUTHOR

Gorlow Maxim aka Sheridan <sheridan@sheridan-home.ru> - email and jabber

=head1 LICENSE

GPLv2

=cut


use strict;
use warnings;
use IO::Dir;
use Munin::Plugin;

need_multigraph();

my $proc_path = '/proc/acpi/battery';
my $sys_path  = '/sys/class/power_supply';

my $proc_data_exists;
my $sys_data_exists;
my $batteryes_count;

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

sub get_batteryes_count
{
  my $path = $_[0];
  return 0 unless (-e $path);
  my $count = 0;
  my $dir = IO::Dir->new($path);
  if(defined $dir)
  {
    my $d;
    while (defined ($d = $dir->read))
    {
      next unless $d =~ m/BAT\d+/;
      $count++;
    }
  }
  else { return 0; }
  return $count;
}

sub init
{
  my $proc_batt_count = get_batteryes_count($proc_path);
  my $sys_batt_count  = get_batteryes_count($sys_path );
  #print "$proc_batt_count $sys_batt_count\n";
  $proc_data_exists = $proc_batt_count > 0;
  $sys_data_exists = $sys_batt_count   > 0;
  if ($proc_data_exists and $sys_data_exists and ($proc_batt_count != $sys_batt_count))
  {
    die "Something wrong, batteryes count from $proc_path and $sys_path not equal (proc: $proc_batt_count, sys: $sys_batt_count)!"
  }
  if     ($proc_data_exists) { $batteryes_count = $proc_batt_count; }
  elsif  ($sys_data_exists)  { $batteryes_count = $sys_batt_count;  }
  unless ($batteryes_count)
  {
    die "Batteryes not found."
  }
}

sub read_proc_data
{
  my ($batt_num, $file) = @_[0..1];
  my ($var, $val, $result);
  open(FH, '<', "${proc_path}/BAT${batt_num}/${file}") or die $!;
  foreach my $line (<FH>)
  {
    chomp ($line);
    ($var, $val) = split(':', $line);
    if    ($val =~ m/^\s*$/  ) { $val = "nan"; }
    elsif ($val =~ m/\w\s+\w/) { $val = (split(" " ,$val))[0]; }
    $result->{$var} = trim($val);
    #print "var $var - val $val\n";
  }
  close(FH);
  return $result;
}

sub read_sys_data
{
  my ($batt_num, $file) = @_[0..1];
  my $file_content = "nan";
  open(FH, '<', "${sys_path}/BAT${batt_num}/${file}") or die $!;
  $file_content = <FH>;
  close(FH);
  chomp ($file_content);
  if($file_content =~ m/^\s*$/) { return 'nan'; }
  return $file_content;
}

sub percent
{
	my ($full, $current) = @_[0..1];
	return $current/($full/100);
}

sub read_info
{
  my $info;
  for (my $i = 0; $i < $batteryes_count; $i++)
  {
    if($sys_data_exists)
    {
      $info->{$i}{'manufacturer'}  = read_sys_data($i, 'manufacturer');
      $info->{$i}{'battery_type'}  = read_sys_data($i, 'technology'   );
      $info->{$i}{'model_name'}    = read_sys_data($i, 'model_name'   );
      $info->{$i}{'serial_number'} = read_sys_data($i, 'serial_number');
    }
    else
    {
      my $proc_info = read_proc_data($i, 'info');
      $info->{$i}{'manufacturer'}  = $proc_info->{'OEM info'     };
      $info->{$i}{'battery_type'}  = $proc_info->{'battery type' };
      $info->{$i}{'model_name'}    = $proc_info->{'model number' };
      $info->{$i}{'serial_number'} = $proc_info->{'serial number'};
    }
  }
  return $info;
}

sub read_data
{
  my $data;
  for (my $i = 0; $i < $batteryes_count; $i++)
  {
    if($sys_data_exists)
    {
      my $divider = 1000000; # need for equvivalent sys and proc data
      $data->{$i}{'design_capacity'}    = read_sys_data($i, 'charge_full_design')/$divider;
      $data->{$i}{'last_full_capacity'} = read_sys_data($i, 'charge_full')       /$divider;
      $data->{$i}{'remaining_capacity'} = read_sys_data($i, 'charge_now')        /$divider;
      $data->{$i}{'design_voltage'}     = read_sys_data($i, 'voltage_min_design')/$divider;
      $data->{$i}{'present_voltage'}    = read_sys_data($i, 'voltage_now')       /$divider;
      $data->{$i}{'present_rate'}       = read_sys_data($i, 'current_now')       /$divider;
    }
    if($proc_data_exists)
    {
      my $divider = 1000; # need for equvivalent sys and proc data
      my $proc_info = read_proc_data($i, 'info');
      unless($sys_data_exists)
      {
        my $proc_state = read_proc_data($i, 'state');
        $data->{$i}{'design_capacity'}    = $proc_info ->{'design capacity'}   /$divider;
        $data->{$i}{'last_full_capacity'} = $proc_info ->{'last full capacity'}/$divider;
        $data->{$i}{'remaining_capacity'} = $proc_state->{'remaining capacity'}/$divider;
        $data->{$i}{'design_voltage'}     = $proc_info ->{'design voltage'}    /$divider;
        $data->{$i}{'present_voltage'}    = $proc_state->{'present voltage'}   /$divider;
        $data->{$i}{'present_rate'}       = $proc_state->{'present rate'}      /$divider;
      }
      $data->{$i}{'design_capacity_low'}     = $proc_info ->{'design capacity low'}    /$divider;
      $data->{$i}{'design_capacity_warning'} = $proc_info ->{'design capacity warning'}/$divider;
      $data->{$i}{'capacity_granularity_1'}  = $proc_info ->{'capacity granularity 1'} /$divider;
      $data->{$i}{'capacity_granularity_2'}  = $proc_info ->{'capacity granularity 2'} /$divider;
    }
    $data->{$i}{'current_voltage_percent'}  = percent($data->{$i}{'design_voltage'}    , $data->{$i}{'present_voltage'});
    $data->{$i}{'current_capacity_percent'} = percent($data->{$i}{'last_full_capacity'}, $data->{$i}{'remaining_capacity'});
    $data->{$i}{'full_capacity_percent'}    = percent($data->{$i}{'design_capacity'}   , $data->{$i}{'last_full_capacity'});
  }
  return $data;
}


my $graphs =
{
  'batteryes_capacity' => { 'vlabel' => 'Capacity, Ah', 'title' => '%s capacity', 'args' => '--base 1000',
                            'fields' => [qw/design_capacity last_full_capacity design_capacity_low design_capacity_warning capacity_granularity_1 capacity_granularity_2 remaining_capacity/] },
  'batteryes_voltage'  => { 'vlabel' => 'Voltage, V'  , 'title' => '%s voltage' , 'args' => '--base 1000',
                            'fields' => [qw/design_voltage present_voltage/] },
  'batteryes_percents' => { 'vlabel' => '%'            , 'title' => '%s percents', 'args' => '--base 1000 --upper-limit 100 -l 0',
                            'fields' => [qw/current_voltage_percent current_capacity_percent full_capacity_percent/] },
  'batteryes_current'  => { 'vlabel' => 'Current, A'  , 'title' => '%s current' , 'args' => '--base 1000',
                            'fields' => [qw/present_rate/] }
};

my $fields =
{
  'design_capacity'          => { 'source' => 'both', 'draw' => 'AREA' , 'label' => 'Design capacity'        , 'info' => 'Battery design capacity' },
  'last_full_capacity'       => { 'source' => 'both', 'draw' => 'AREA' , 'label' => 'Last full capacity'     , 'info' => 'Battery full charge capacity' },
  'design_capacity_low'      => { 'source' => 'proc', 'draw' => 'LINE2', 'label' => 'Design capacity low'    , 'info' => 'Low battery level' },
  'design_capacity_warning'  => { 'source' => 'proc', 'draw' => 'LINE2', 'label' => 'Design capacity warning', 'info' => 'Warning battery level' },
  'capacity_granularity_1'   => { 'source' => 'proc', 'draw' => 'LINE2', 'label' => 'Capacity granularity 1' , 'info' => 'Capacity granularity 1' },
  'capacity_granularity_2'   => { 'source' => 'proc', 'draw' => 'LINE2', 'label' => 'Capacity granularity 2' , 'info' => 'Capacity granularity 2' },
  'remaining_capacity'       => { 'source' => 'both', 'draw' => 'LINE2', 'label' => 'Remaining capacity'     , 'info' => 'Current battery charge' },
  'present_rate'             => { 'source' => 'both', 'draw' => 'LINE2', 'label' => 'Present rate'           , 'info' => 'Current battery rate' },
  'design_voltage'           => { 'source' => 'both', 'draw' => 'AREA' , 'label' => 'Design voltage'         , 'info' => 'Battery design voltage' },
  'present_voltage'          => { 'source' => 'both', 'draw' => 'AREA' , 'label' => 'Present voltage'        , 'info' => 'Current battery voltage' },
  'current_voltage_percent'  => { 'source' => 'both', 'draw' => 'LINE2', 'label' => 'Current/design voltage' , 'info' => 'Current battery voltage / ( Battery design voltage / 100 )' },
  'current_capacity_percent' => { 'source' => 'both', 'draw' => 'LINE2', 'label' => 'Current/full capacity'  , 'info' => 'Current battery charge / ( Battery full charge capacity / 100 )' },
  'full_capacity_percent'    => { 'source' => 'both', 'draw' => 'LINE2', 'label' => 'Full/design capacity'   , 'info' => 'Battery full charge capacity / ( Battery design capacity / 100 )' },
};

# ------------------------------------ start here -----------------------------------

if (defined($ARGV[0]) and ($ARGV[0] eq 'autoconf'))
{
  printf("%s\n", (-e $proc_path or -e $sys_path) ? "yes" : "no ($proc_path and $sys_path not exists)");
  exit (0);
}

init();

if ($ARGV[0] and $ARGV[0] eq "config")
{
  my %config;
  my $info = read_info();
  foreach my $graph (keys %{$graphs})
  {
    my @order;
    $config{$graph}{'graph'}{'title'}    = sprintf($graphs->{$graph}{'title'}, 'Mean batteryes');
    $config{$graph}{'graph'}{'args'}     = $graphs->{$graph}{'args'};
    $config{$graph}{'graph'}{'vlabel'}   = $graphs->{$graph}{'vlabel'};
    $config{$graph}{'graph'}{'category'} = 'sensors';
    foreach my $field (@{$graphs->{$graph}{'fields'}})
    {
      if(($proc_data_exists and $fields->{$field}{'source'} eq 'proc') or $fields->{$field}{'source'} eq 'both')
      {
        $config{$graph}{'fields'}{$field}{'label'} = $fields->{$field}{'label'};
        $config{$graph}{'fields'}{$field}{'info'}  = $fields->{$field}{'info'};
        $config{$graph}{'fields'}{$field}{'draw'}  = $fields->{$field}{'draw'};
        $config{$graph}{'fields'}{$field}{'type'}  = 'GAUGE';
        push(@order, $field);
      }
    }
    $config{$graph}{'graph'}{'order'} = join(' ', @order);
    for (my $i = 0; $i < $batteryes_count; $i++)
    {
      my @b_order;
      my $battery_name = sprintf("BAT%s", $i);
      my $graph_name   = sprintf("%s.%s", $graph, $battery_name);
      $config{$graph_name}{'graph'}{'title'}    = sprintf($graphs->{$graph}{'title'}, $battery_name);
      $config{$graph_name}{'graph'}{'info'}     = sprintf("%s battery %s %s (sn: %s)", $info->{$i}{'battery_type'}, $info->{$i}{'manufacturer'}, $info->{$i}{'model_name'}, $info->{$i}{'serial_number'});
      $config{$graph_name}{'graph'}{'args'}     = '--base 1000';
      $config{$graph_name}{'graph'}{'vlabel'}   = $graphs->{$graph}{'vlabel'};
      $config{$graph_name}{'graph'}{'category'} = 'sensors';
      foreach my $field (@{$graphs->{$graph}{'fields'}})
      {
        if(($proc_data_exists and $fields->{$field}{'source'} eq 'proc') or $fields->{$field}{'source'} eq 'both')
        {
          $config{$graph_name}{'fields'}{$field}{'label'} = $fields->{$field}{'label'};
          $config{$graph_name}{'fields'}{$field}{'info'}  = $fields->{$field}{'info'};
          $config{$graph_name}{'fields'}{$field}{'draw'}  = $fields->{$field}{'draw'};
          $config{$graph_name}{'fields'}{$field}{'type'}  = 'GAUGE';
          push(@b_order, $field);
        }
      }
      $config{$graph_name}{'graph'}{'order'} = join(' ', @b_order);
    }
  }
  # ---------------- print ------------------
  foreach my $graph (sort keys %config)
  {
    printf("multigraph %s\n", $graph);
    foreach my $g_option(sort keys %{$config{$graph}{'graph'}})
    {
      printf("graph_%s %s\n", $g_option, $config{$graph}{'graph'}{$g_option});
    }
    foreach my $field (sort keys %{$config{$graph}{'fields'}})
    {
      foreach my $f_option (sort keys %{$config{$graph}{'fields'}{$field}})
      {
        printf("%s.%s %s\n", $field, $f_option, $config{$graph}{'fields'}{$field}{$f_option});
      }
    }
    print "\n";
  }
  exit (0);
}

# -----------------------------  values ---------------------------------------------
my $data = read_data();
foreach my $graph (sort keys %{$graphs})
{
  printf ("multigraph %s\n", $graph);
  foreach my $field (sort @{$graphs->{$graph}{'fields'}})
  {
    my $field_summ = 0;
    if(($proc_data_exists and $fields->{$field}{'source'} eq 'proc') or $fields->{$field}{'source'} eq 'both')
    {
      for (my $i = 0; $i < $batteryes_count; $i++)
      {
        $field_summ += $data->{$i}{$field};
      }
      printf("%s.value %s\n", $field, $field_summ/$batteryes_count);
    }
  }
  print "\n";
  for (my $i = 0; $i < $batteryes_count; $i++)
  {
    my $graph_name = sprintf("%s.BAT%s", $graph, $i);
    printf ("multigraph %s\n", $graph_name);
    foreach my $field (sort @{$graphs->{$graph}{'fields'}})
    {
      if(($proc_data_exists and $fields->{$field}{'source'} eq 'proc') or $fields->{$field}{'source'} eq 'both')
      {
        printf("%s.value %s\n", $field, $data->{$i}{$field});
      }
    }
    print "\n";
  }
}