#
# Copyright 2017 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 apps::elasticsearch::restapi::mode::indices;

use base qw(centreon::plugins::templates::counter);

use strict;
use warnings;

my $instance_mode;

sub custom_status_threshold {
    my ($self, %options) = @_; 
    my $status = 'ok';
    my $message;
    
    eval {
        local $SIG{__WARN__} = sub { $message = $_[0]; };
        local $SIG{__DIE__} = sub { $message = $_[0]; };
        
        if (defined($instance_mode->{option_results}->{critical_status}) && $instance_mode->{option_results}->{critical_status} ne '' &&
            eval "$instance_mode->{option_results}->{critical_status}") {
            $status = 'critical';
        } elsif (defined($instance_mode->{option_results}->{warning_status}) && $instance_mode->{option_results}->{warning_status} ne '' &&
                 eval "$instance_mode->{option_results}->{warning_status}") {
            $status = 'warning';
        }
    };
    if (defined($message)) {
        $self->{output}->output_add(long_msg => 'filter status issue: ' . $message);
    }

    return $status;
}

sub custom_status_output {
    my ($self, %options) = @_;
    my $msg = 'status : ' . $self->{result_values}->{status};

    return $msg;
}

sub custom_status_calc {
    my ($self, %options) = @_;
    
    $self->{result_values}->{status} = $options{new_datas}->{$self->{instance} . '_status'};
    $self->{result_values}->{display} = $options{new_datas}->{$self->{instance} . '_display'};    
    return 0;
}

sub set_counters {
    my ($self, %options) = @_;
    
    $self->{maps_counters_type} = [
        { name => 'indices', type => 1, cb_prefix_output => 'prefix_indices_output', message_multiple => 'All indices are ok' },
    ];
    
    $self->{maps_counters}->{indices} = [
         { label => 'status', threshold => 0, set => {
                key_values => [ { name => 'status' }, { name => 'display' } ],
                closure_custom_calc => $self->can('custom_status_calc'),
                closure_custom_output => $self->can('custom_status_output'),
                closure_custom_perfdata => sub { return 0; },
                closure_custom_threshold_check => $self->can('custom_status_threshold'),
            }
        },
        { label => 'active-primary-shards', set => {
                key_values => [ { name => 'active_primary_shards' }, { name => 'display' } ],
                output_template => 'Active Primary Shards : %s',
                perfdatas => [
                    { label => 'active_primary_shards', value => 'active_primary_shards_absolute', template => '%s',
                      min => 0, label_extra_instance => 1, instance_use => 'display_absolute' },
                ],
            }
        },
        { label => 'active-shards', set => {
                key_values => [ { name => 'active_shards' }, { name => 'display' } ],
                output_template => 'Active Shards : %s',
                perfdatas => [
                    { label => 'active_shards', value => 'active_shards_absolute', template => '%s',
                      min => 0, label_extra_instance => 1, instance_use => 'display_absolute' },
                ],
            }
        },
    ];
}

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 =>
                                {
                                  "elastic-path:s"      => { name => 'elastic_path', default => '/_cluster/health?level=indices' },
                                  "filter-name:s"       => { name => 'filter_name' },
                                  "warning-status:s"    => { name => 'warning_status', default => '%{status} =~ /yellow/i' },
                                  "critical-status:s"   => { name => 'critical_status', default => '%{status} =~ /red/i' },
                                });
   
    return $self;
}

sub check_options {
    my ($self, %options) = @_;
    $self->SUPER::check_options(%options);

    $instance_mode = $self;
    $self->change_macros();
}

sub prefix_indices_output {
    my ($self, %options) = @_;
    
    return "Indices '" . $options{instance_value}->{display} . "' ";
}

sub change_macros {
    my ($self, %options) = @_;
    
    foreach (('warning_status', 'critical_status')) {
        if (defined($self->{option_results}->{$_})) {
            $self->{option_results}->{$_} =~ s/%\{(.*?)\}/\$self->{result_values}->{$1}/g;
        }
    }
}

sub manage_selection {
    my ($self, %options) = @_;
                                                           
    $self->{indices} = {};
    my $result = $options{custom}->get(path => $self->{option_results}->{elastic_path});

    foreach my $indice (keys %{$result->{indices}}) {        
        if (defined($self->{option_results}->{filter_name}) && $self->{option_results}->{filter_name} ne '' &&
            $indice !~ /$self->{option_results}->{filter_name}/) {
            $self->{output}->output_add(long_msg => "skipping  '" . $indice . "': no matching filter.", debug => 1);
            next;
        }
        
        $self->{indices}->{$indice} = { 
            display => $indice,
            status => $result->{indices}->{$indice}->{status},
            active_primary_shards => $result->{indices}->{$indice}->{active_primary_shards},
            active_shards => $result->{indices}->{$indice}->{active_shards},
        };
    }
    
    if (scalar(keys %{$self->{indices}}) <= 0) {
        $self->{output}->add_option_msg(short_msg => "No indices found.");
        $self->{output}->option_exit();
    }
}

1;

__END__

=head1 MODE

Check Elasticsearch indices.

=over 8

=item B<--elastic-path>

Set path to get Elasticsearch information (Default: '/_cluster/health?level=indices')

=item B<--filter-name>

Filter name (can be a regexp).

=item B<--filter-counters>

Only display some counters (regexp can be used).
Example: --filter-counters='^status$'

=item B<--warning-*>

Threshold warning.
Can be: 'active-primary-shards', 'active-shards'.

=item B<--critical-*>

Threshold critical.
Can be: 'active-primary-shards', 'active-shards'.

=item B<--warning-status>

Set warning threshold for status (Default: '%{status} =~ /yellow/i')
Can used special variables like: %{display}, %{status}.

=item B<--critical-status>

Set critical threshold for status (Default: '%{status} =~ /red/i').
Can used special variables like: %{display}, %{status}.

=back

=cut