#
# Copyright 2021 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::cadvisor::restapi::mode::diskio;

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

use strict;
use warnings;
use DateTime;

sub set_counters {
    my ($self, %options) = @_;
    
    $self->{maps_counters_type} = [
        { name => 'containers_diskio', type => 1, cb_prefix_output => 'prefix_containers_diskio_output', message_multiple => 'All container disk IOps are ok', skipped_code => { -11 => 1 } },
    ];
    
    $self->{maps_counters}->{containers_diskio} = [
        { label => 'diskio-read', nlabel => 'disk.io.read.bytespersecond', set => {
                key_values => [ { name => 'diskio_read' }, { name => 'display' } ],
                output_change_bytes => 1,
                output_template => 'Disk IO Read: %s %s/s',
                perfdatas => [
                    { label => 'diskio_read', template => '%.2f',
                      min => 0, unit => 'B/s', label_extra_instance => 1, instance_use => 'display' }
                ]
            }
        },
        { label => 'diskio-write', nlabel => 'disk.io.write.bytespersecond', set => {
                key_values => [ { name => 'diskio_write' }, { name => 'display' } ],
                output_change_bytes => 1,
                output_template => 'Disk IO Write: %s %s/s',
                perfdatas => [
                    { label => 'diskio_write', template => '%.2f',
                      min => 0, unit => 'B/s', label_extra_instance => 1, instance_use => 'display' }
                ]
            }
        }
    ];
}

sub new {
    my ($class, %options) = @_;
    my $self = $class->SUPER::new(package => __PACKAGE__, %options, force_new_perfdata => 1);
    bless $self, $class;
    
    $options{options}->add_options(arguments => {
        'container-id:s'   => { name => 'container_id' },
        'container-name:s' => { name => 'container_name' },
        'filter-name:s'    => { name => 'filter_name' },
        'use-name'         => { name => 'use_name' }
    });

    return $self;
}

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

    return "Container '" . $options{instance_value}->{display} . "' ";
}

sub manage_selection {
    my ($self, %options) = @_;
                                                           
    $self->{containers_diskio} = {};
    my $result = $options{custom}->api_get_containers(
        container_id => $self->{option_results}->{container_id}, 
        container_name => $self->{option_results}->{container_name}
    );
    my $machine_stats = $options{custom}->api_get_machine_stats();

    foreach my $container_id (keys %{$result}) {
        next if (!defined($result->{$container_id}->{Stats})); 
        
        my $name = $result->{$container_id}->{Name};
        if (defined($self->{option_results}->{filter_name}) && $self->{option_results}->{filter_name} ne '' &&
            $name !~ /$self->{option_results}->{filter_name}/) {
            $self->{output}->output_add(long_msg => "skipping  '" . $name . "': no matching filter.", debug => 1);
            next;
        }
        
        my $first_index = 0;
        my $first_stat = $result->{$container_id}->{Stats}[$first_index];
        my $first_ts = $first_stat->{timestamp};
        my $first_dt = $self->parse_date(date => $first_ts);

        my $last_index = scalar @{$result->{$container_id}->{Stats}} - 1;
        my $last_stat = $result->{$container_id}->{Stats}[$last_index];
        my $last_ts = $last_stat->{timestamp};
        my $last_dt = $self->parse_date(date => $last_ts);

        my $diff_ts = $last_dt - $first_dt;
        my $read_io = {};
        my $write_io = {};

        if (keys $first_stat->{diskio}) {
            $self->{containers}->{$container_id} = {
                node_name           => $result->{$container_id}->{NodeName},
                display             => defined($self->{option_results}->{use_name}) ? $name : $container_id,
                name                => $name,
            };
            # The API does not present the devices in the same order between the first and the last stats sample, so we can't just compare [0] with [0] and [1] with [1], we have to check the name of the device
            foreach my $diskio_index (0..(scalar(@{$first_stat->{diskio}->{io_service_bytes}}) - 1)) {
                my $name = defined($self->{option_results}->{use_name}) ? $name : $container_id;
                my $device = $first_stat->{diskio}->{io_service_bytes}->[$diskio_index]->{device};
                $name .= ':' . $device;
                $read_io->{$name} = {first => $first_stat->{diskio}->{io_service_bytes}->[$diskio_index]->{stats}->{Read}};
                $write_io->{$name} = {first => $first_stat->{diskio}->{io_service_bytes}->[$diskio_index]->{stats}->{Write}};
            }
            foreach my $diskio_index (0..(scalar(@{$last_stat->{diskio}->{io_service_bytes}}) - 1)) {
                my $name = defined($self->{option_results}->{use_name}) ? $name : $container_id;
                my $device = $last_stat->{diskio}->{io_service_bytes}->[$diskio_index]->{device};
                $name .= ':' . $device;
                $read_io->{$name}->{last} = $last_stat->{diskio}->{io_service_bytes}->[$diskio_index]->{stats}->{Read};
                $write_io->{$name}->{last} = $last_stat->{diskio}->{io_service_bytes}->[$diskio_index]->{stats}->{Write};
            }
            foreach my $diskio_disk (keys %$read_io) {
                $self->{containers_diskio}->{$diskio_disk} = {
                    display         => $diskio_disk,
                    diskio_read     => ($read_io->{$diskio_disk}->{last} - $read_io->{$diskio_disk}->{first}) / $diff_ts ,
                    diskio_write    => ($write_io->{$diskio_disk}->{last} - $write_io->{$diskio_disk}->{first}) / $diff_ts,
                };
            }
        }
    }

    if (scalar(keys %{$self->{containers}}) <= 0) {
        $self->{output}->add_option_msg(short_msg => "No containers found or no data available for diskio metrics.");
        $self->{output}->option_exit();
    }
    
    my $hostnames = $options{custom}->get_hostnames();
}

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

    if ($options{date} !~ /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})\.(\d*)([^\d]+)$/) {
        $self->{output}->add_option_msg(short_msg => "Wrong time found '" . $options{date} . "'.");
        $self->{output}->option_exit();
    }
    my $dt = DateTime->new(
        year => $1, month => $2, day => $3, 
        hour => $4, minute => $5, second => $6, 
        time_zone => $8
    );
    # return epoch time with nanoseconds
    return $dt->epoch.".".$7;
}


1;

__END__

=head1 MODE

Check container disk io.

=over 8

=item B<--container-id>

Exact container ID.

=item B<--container-name>

Exact container name (if multiple names: names separated by ':').

=item B<--use-name>

Use name for perfdata and display.

=item B<--filter-name>

Filter by container name (can be a regexp).

=item B<--filter-counters>

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

=item B<--warning-*>

Threshold warning.
Can be: 'diskio-read', 'diskio-write'.

=item B<--critical-*>

Threshold critical.
Can be: 'diskio-read', 'diskio-write'.

=back

=cut