#
# Copyright 2016 Centreon (http://www.centreon.com/)
#
# Centreon is a full-fledged industry-strength solution that meets
# the needs in IT infrastructure and application monitoring for
# service performance.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

package os::linux::local::mode::storage;

use base qw(centreon::plugins::mode);

use strict;
use warnings;
use centreon::plugins::misc;

sub new {
    my ($class, %options) = @_;
    my $self = $class->SUPER::new(package => __PACKAGE__, %options);
    bless $self, $class;
    
    $self->{version} = '1.0';
    $options{options}->add_options(arguments =>
                                {
                                  "hostname:s"        => { name => 'hostname' },
                                  "remote"            => { name => 'remote' },
                                  "ssh-option:s@"     => { name => 'ssh_option' },
                                  "ssh-path:s"        => { name => 'ssh_path' },
                                  "ssh-command:s"     => { name => 'ssh_command', default => 'ssh' },
                                  "timeout:s"         => { name => 'timeout', default => 30 },
                                  "sudo"              => { name => 'sudo' },
                                  "command:s"         => { name => 'command', default => 'df' },
                                  "command-path:s"    => { name => 'command_path' },
                                  "command-options:s" => { name => 'command_options', default => '-P -k -T 2>&1' },
                                  "filter-type:s"     => { name => 'filter_type', },
                                  "filter-fs:s"       => { name => 'filter_fs', },
                                  "warning:s"         => { name => 'warning' },
                                  "critical:s"        => { name => 'critical' },
                                  "units:s"           => { name => 'units', default => '%' },
                                  "free"              => { name => 'free' },
                                  "name:s"            => { name => 'name' },
                                  "regexp"              => { name => 'use_regexp' },
                                  "regexp-isensitive"   => { name => 'use_regexpi' },
                                  "space-reservation:s" => { name => 'space_reservation' },
                                });
    $self->{result} = {};
    return $self;
}

sub check_options {
    my ($self, %options) = @_;
    $self->SUPER::init(%options);
    if (($self->{perfdata}->threshold_validate(label => 'warning', value => $self->{option_results}->{warning})) == 0) {
       $self->{output}->add_option_msg(short_msg => "Wrong warning threshold '" . $self->{option_results}->{warning} . "'.");
       $self->{output}->option_exit();
    }
    if (($self->{perfdata}->threshold_validate(label => 'critical', value => $self->{option_results}->{critical})) == 0) {
       $self->{output}->add_option_msg(short_msg => "Wrong critical threshold '" . $self->{option_results}->{critical} . "'.");
       $self->{output}->option_exit();
    }
}

sub manage_selection {
    my ($self, %options) = @_;

    my $stdout = centreon::plugins::misc::execute(output => $self->{output},
                                                  options => $self->{option_results},
                                                  sudo => $self->{option_results}->{sudo},
                                                  command => $self->{option_results}->{command},
                                                  command_path => $self->{option_results}->{command_path},
                                                  command_options => $self->{option_results}->{command_options});
    my @lines = split /\n/, $stdout;
    # Header not needed
    shift @lines;
    foreach my $line (@lines) {
        next if ($line !~ /^(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(.*)/);
        my ($fs, $type, $size, $used, $available, $percent, $mount) = ($1, $2, $3, $4, $5, $6, $7);
        
        next if (defined($self->{option_results}->{filter_fs}) && $self->{option_results}->{filter_fs} ne '' &&
                 $fs !~ /$self->{option_results}->{filter_fs}/);
        next if (defined($self->{option_results}->{filter_type}) && $self->{option_results}->{filter_type} ne '' &&
                 $type !~ /$self->{option_results}->{filter_type}/);
        
        next if (defined($self->{option_results}->{name}) && defined($self->{option_results}->{use_regexp}) && defined($self->{option_results}->{use_regexpi}) 
            && $mount !~ /$self->{option_results}->{name}/i);
        next if (defined($self->{option_results}->{name}) && defined($self->{option_results}->{use_regexp}) && !defined($self->{option_results}->{use_regexpi}) 
            && $mount !~ /$self->{option_results}->{name}/);
        next if (defined($self->{option_results}->{name}) && !defined($self->{option_results}->{use_regexp}) && !defined($self->{option_results}->{use_regexpi})
            && $mount ne $self->{option_results}->{name});
        
        $self->{result}->{$mount} = {fs => $fs, type => $type, total => $size, used => $used, free => $available};
    }
    
    if (scalar(keys %{$self->{result}}) <= 0) {
        if (defined($self->{option_results}->{name})) {
            $self->{output}->add_option_msg(short_msg => "No storage found for mount point '" . $self->{option_results}->{name} . "'.");
        } else {
            $self->{output}->add_option_msg(short_msg => "No storage found.");
        }
        $self->{output}->option_exit();
    }
}

sub run {
    my ($self, %options) = @_;
	
    $self->manage_selection();
    if (!defined($self->{option_results}->{name}) || defined($self->{option_results}->{use_regexp})) {
        $self->{output}->output_add(severity => 'OK',
                                    short_msg => 'All storages are ok.');
    }
    
    my $num_disk_check = 0;
    foreach my $name (sort(keys %{$self->{result}})) {
        my $total_size = $self->{result}->{$name}->{total} * 1024;
        if (defined($self->{option_results}->{space_reservation})) {
            $total_size = $total_size - ($self->{option_results}->{space_reservation} * $total_size / 100);
        }
        next if ($total_size == 0);
        
        $num_disk_check++;
        my $total_used = $self->{result}->{$name}->{used} * 1024;
        my $total_free = $self->{result}->{$name}->{free} * 1024;
        my $prct_used = $total_used * 100 / $total_size;
        my $prct_free = 100 - $prct_used;

        my ($exit, $threshold_value);

        $threshold_value = $total_used;
        $threshold_value = $total_free if (defined($self->{option_results}->{free}));
        if ($self->{option_results}->{units} eq '%') {
            $threshold_value = $prct_used;
            $threshold_value = $prct_free if (defined($self->{option_results}->{free}));
        } 
        $exit = $self->{perfdata}->threshold_check(value => $threshold_value, threshold => [ { label => 'critical', 'exit_litteral' => 'critical' }, { label => 'warning', exit_litteral => 'warning' } ]);

        my ($total_size_value, $total_size_unit) = $self->{perfdata}->change_bytes(value => $total_size);
        my ($total_used_value, $total_used_unit) = $self->{perfdata}->change_bytes(value => $total_used);
        my ($total_free_value, $total_free_unit) = $self->{perfdata}->change_bytes(value => ($total_size - $total_used));

        $self->{output}->output_add(long_msg => sprintf("Storage '%s' Total: %s Used: %s (%.2f%%) Free: %s (%.2f%%)", $name,
                                            $total_size_value . " " . $total_size_unit,
                                            $total_used_value . " " . $total_used_unit, $prct_used,
                                            $total_free_value . " " . $total_free_unit, $prct_free));
        if (!$self->{output}->is_status(value => $exit, compare => 'ok', litteral => 1) || (defined($self->{option_results}->{name}) && !defined($self->{option_results}->{use_regexp}))) {
            $self->{output}->output_add(severity => $exit,
                                        short_msg => sprintf("Storage '%s' Total: %s Used: %s (%.2f%%) Free: %s (%.2f%%)", $name,
                                            $total_size_value . " " . $total_size_unit,
                                            $total_used_value . " " . $total_used_unit, $prct_used,
                                            $total_free_value . " " . $total_free_unit, $prct_free));
        }    

        my $label = 'used';
        my $value_perf = $total_used;
        if (defined($self->{option_results}->{free})) {
            $label = 'free';
            $value_perf = $total_free;
        }
        my $extra_label = '';
        $extra_label = '_' . $name if (!defined($self->{option_results}->{name}) || defined($self->{option_results}->{use_regexp}));
        my %total_options = ();
        if ($self->{option_results}->{units} eq '%') {
            $total_options{total} = $total_size;
            $total_options{cast_int} = 1; 
        }
        $self->{output}->perfdata_add(label => $label . $extra_label, unit => 'B',
                                      value => $value_perf,
                                      warning => $self->{perfdata}->get_perfdata_for_output(label => 'warning', %total_options),
                                      critical => $self->{perfdata}->get_perfdata_for_output(label => 'critical', %total_options),
                                      min => 0, max => $total_size);
    }

    if ($num_disk_check == 0) {
        $self->{output}->add_option_msg(short_msg => "No storage checked.");
        $self->{output}->option_exit();
    }
    
    $self->{output}->display();
    $self->{output}->exit();
}

1;

__END__

=head1 MODE

Check storage usages.

=over 8

=item B<--remote>

Execute command remotely in 'ssh'.

=item B<--hostname>

Hostname to query (need --remote).

=item B<--ssh-option>

Specify multiple options like the user (example: --ssh-option='-l=centreon-engine' --ssh-option='-p=52').

=item B<--ssh-path>

Specify ssh command path (default: none)

=item B<--ssh-command>

Specify ssh command (default: 'ssh'). Useful to use 'plink'.

=item B<--timeout>

Timeout in seconds for the command (Default: 30).

=item B<--sudo>

Use 'sudo' to execute the command.

=item B<--command>

Command to get information (Default: 'df').
Can be changed if you have output in a file.

=item B<--command-path>

Command path (Default: none).

=item B<--command-options>

Command options (Default: '-P -k -T 2>&1').

=item B<--warning>

Threshold warning.

=item B<--critical>

Threshold critical.

=item B<--units>

Units of thresholds (Default: '%') ('%', 'B').

=item B<--free>

Thresholds are on free space left.

=item B<--name>

Set the storage mount point (empty means 'check all storages')

=item B<--regexp>

Allows to use regexp to filter storage mount point (with option --name).

=item B<--regexp-isensitive>

Allows to use regexp non case-sensitive (with --regexp).

=item B<--filter-type>

Filter filesystem type (regexp can be used).

=item B<--filter-fs>

Filter filesystem (regexp can be used).

=item B<--space-reservation>

Some filesystem has space reserved (like ext4 for root).
The value is in percent of total (Default: none).

=back

=cut