#
# Copyright 2020 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 cloud::prometheus::exporters::cadvisor::mode::load;

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

use strict;
use warnings;

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

    $self->{maps_counters_type} = [
        { name => 'containers', type => 1, cb_prefix_output => 'prefix_containers_output',
          message_multiple => 'All containers load are ok' },
    ];

    $self->{maps_counters}->{containers} = [
        { label => 'load', nlabel => 'container.load.count', set => {
                key_values => [ { name => 'load' }, { name => 'container' }, { name => 'pod' }, { name => 'perf' } ],
                output_template => 'Load: %.2f',
                output_change_bytes => 1,
                perfdatas => [
                    { label => 'load', value => 'load_absolute', template => '%.2f',
                      min => 0, label_extra_instance => 1, instance_use => 'perf_absolute' },
                ],
            }
        },
    ];
}

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

    return "Container '" . $options{instance_value}->{container} . "' [pod: " . $options{instance_value}->{pod} . "] ";
}

sub new {
    my ($class, %options) = @_;
    my $self = $class->SUPER::new(package => __PACKAGE__, %options);
    bless $self, $class;
    
    $options{options}->add_options(arguments => {
        "container:s"           => { name => 'container', default => 'container_name!~".*POD.*"' },
        "pod:s"                 => { name => 'pod', default => 'pod_name=~".*"' },
        "extra-filter:s@"       => { name => 'extra_filter' },
        "metric-overload:s@"    => { name => 'metric_overload' },
    });
   
    return $self;
}

sub check_options {
    my ($self, %options) = @_;
    $self->SUPER::check_options(%options);
    
    $self->{metrics} = {
        'load' => '^container_cpu_load_average_10s$',
    };
    foreach my $metric (@{$self->{option_results}->{metric_overload}}) {
        next if ($metric !~ /(.*),(.*)/);
        $self->{metrics}->{$1} = $2 if (defined($self->{metrics}->{$1}));
    }

    $self->{labels} = {};
    foreach my $label (('container', 'pod')) {
        if ($self->{option_results}->{$label} !~ /^(\w+)[!~=]+\".*\"$/) {
            $self->{output}->add_option_msg(short_msg => "Need to specify --" . $label . " option as a PromQL filter.");
            $self->{output}->option_exit();
        }
        $self->{labels}->{$label} = $1;
    }

    $self->{extra_filter} = '';
    foreach my $filter (@{$self->{option_results}->{extra_filter}}) {
        $self->{extra_filter} .= ',' . $filter;
    }

    $self->{prom_timeframe} = defined($self->{option_results}->{timeframe}) ? $self->{option_results}->{timeframe} : 900;
    $self->{prom_step} = defined($self->{option_results}->{step}) ? $self->{option_results}->{step} : "1m";
}

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

    $self->{containers} = {};

    my $results = $options{custom}->query_range(
        queries => [
            'label_replace({__name__=~"' . $self->{metrics}->{load} . '",' .
                $self->{option_results}->{container} . ',' .
                $self->{option_results}->{pod} .
                $self->{extra_filter} . '}, "__name__", "load", "", "")'
        ],
        timeframe => $self->{prom_timeframe},
        step => $self->{prom_step}
    );

    foreach my $result (@{$results}) {
        next if (!defined($result->{metric}->{$self->{labels}->{pod}}) || !defined($result->{metric}->{$self->{labels}->{container}}));
        my $average = $options{custom}->compute(aggregation => 'average', values => $result->{values});
        $self->{containers}->{$result->{metric}->{$self->{labels}->{pod}} . "_" . $result->{metric}->{$self->{labels}->{container}}}->{container} = $result->{metric}->{$self->{labels}->{container}};
        $self->{containers}->{$result->{metric}->{$self->{labels}->{pod}} . "_" . $result->{metric}->{$self->{labels}->{container}}}->{pod} = $result->{metric}->{$self->{labels}->{pod}};
        $self->{containers}->{$result->{metric}->{$self->{labels}->{pod}} . "_" . $result->{metric}->{$self->{labels}->{container}}}->{perf} = $result->{metric}->{$self->{labels}->{pod}} . "_" . $result->{metric}->{$self->{labels}->{container}};
        $self->{containers}->{$result->{metric}->{$self->{labels}->{pod}} . "_" . $result->{metric}->{$self->{labels}->{container}}}->{$result->{metric}->{__name__}} = $average;
    }
    
    if (scalar(keys %{$self->{containers}}) <= 0) {
        $self->{output}->add_option_msg(short_msg => "No containers found.");
        $self->{output}->option_exit();
    }
}

1;

__END__

=head1 MODE

Check containers load.

=over 8

=item B<--container>

Filter on a specific container (Must be a PromQL filter, Default: 'container_name!~".*POD.*"')

=item B<--pod>

Filter on a specific pod (Must be a PromQL filter, Default: 'pod_name=~".*"')

=item B<--warning-load>

Threshold warning.

=item B<--critical-load>

Threshold critical.

=item B<--extra-filter>

Add a PromQL filter (Can be multiple)

Example : --extra-filter='name=~".*pretty.*"'

=item B<--metric-overload>

Overload default metrics name (Can be multiple)

Example : --metric-overload='metric,^my_metric_name$'

Default :

    - load: ^container_cpu_load_average_10s$

=back

=cut
