#
# Copyright 2019 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::aws::custom::awscli;

use strict;
use warnings;
use DateTime;
use JSON::XS;

sub new {
    my ($class, %options) = @_;
    my $self  = {};
    bless $self, $class;

    if (!defined($options{output})) {
        print "Class Custom: Need to specify 'output' argument.\n";
        exit 3;
    }
    if (!defined($options{options})) {
        $options{output}->add_option_msg(short_msg => "Class Custom: Need to specify 'options' argument.");
        $options{output}->option_exit();
    }
    
    if (!defined($options{noptions})) {
        $options{options}->add_options(arguments => 
                    {
                        "aws-secret-key:s"    => { name => 'aws_secret_key' },
                        "aws-access-key:s"    => { name => 'aws_access_key' },
                        "endpoint-url:s"      => { name => 'endpoint_url' },
                        "region:s"            => { name => 'region' },
                        "timeframe:s"         => { name => 'timeframe' },
                        "period:s"            => { name => 'period' },
                        "statistic:s@"        => { name => 'statistic' },
                        "zeroed"              => { name => 'zeroed' },
                        "timeout:s"           => { name => 'timeout', default => 50 },
                        "sudo"                => { name => 'sudo' },
                        "command:s"           => { name => 'command', default => 'aws' },
                        "command-path:s"      => { name => 'command_path' },
                        "command-options:s"   => { name => 'command_options', default => '' },
                        "proxyurl:s"          => { name => 'proxyurl' },
                    });
    }
    $options{options}->add_help(package => __PACKAGE__, sections => 'AWSCLI OPTIONS', once => 1);

    $self->{output} = $options{output};
    $self->{mode} = $options{mode};
    
    return $self;
}

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

    $self->{option_results} = $options{option_results};
}

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

    foreach (keys %{$options{default}}) {
        if ($_ eq $self->{mode}) {
            for (my $i = 0; $i < scalar(@{$options{default}->{$_}}); $i++) {
                foreach my $opt (keys %{$options{default}->{$_}[$i]}) {
                    if (!defined($self->{option_results}->{$opt}[$i])) {
                        $self->{option_results}->{$opt}[$i] = $options{default}->{$_}[$i]->{$opt};
                    }
                }
            }
        }
    }
}

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

    if (defined($self->{option_results}->{proxyurl}) && $self->{option_results}->{proxyurl} ne '') {
        $ENV{HTTP_PROXY} = $self->{option_results}->{proxyurl};
        $ENV{HTTPS_PROXY} = $self->{option_results}->{proxyurl};
    }

    if (defined($self->{option_results}->{aws_secret_key}) && $self->{option_results}->{aws_secret_key} ne '') {
        $ENV{AWS_SECRET_ACCESS_KEY} = $self->{option_results}->{aws_secret_key};
    }
    if (defined($self->{option_results}->{aws_access_key}) && $self->{option_results}->{aws_access_key} ne '') {
        $ENV{AWS_ACCESS_KEY_ID} = $self->{option_results}->{aws_access_key};
    }

    if (!defined($self->{option_results}->{region}) || $self->{option_results}->{region} eq '') {
        $self->{output}->add_option_msg(short_msg => "Need to specify --region option.");
        $self->{output}->option_exit();
    }

    if (defined($self->{option_results}->{statistic})) {
        foreach my $statistic (@{$self->{option_results}->{statistic}}) {
            if ($statistic !~ /minimum|maximum|average|sum/) {
                $self->{output}->add_option_msg(short_msg => "Statistic '" . $statistic . "' is not handled");
                $self->{output}->option_exit();
            }
        }
    }

    $self->{endpoint_url} = (defined($self->{option_results}->{endpoint_url})) ? $self->{option_results}->{endpoint_url} : undef;

    return 0;
}

sub cloudwatch_get_metrics_set_cmd {
    my ($self, %options) = @_;
    
    return if (defined($self->{option_results}->{command_options}) && $self->{option_results}->{command_options} ne '');

    my $cmd_options = "cloudwatch get-metric-statistics --region $options{region} --namespace $options{namespace}" . 
        " --metric-name '$options{metric_name}' --start-time $options{start_time} --end-time $options{end_time}" . 
        " --period $options{period} --statistics " . join(' ', @{$options{statistics}}) . " --output json --dimensions";
    foreach my $entry (@{$options{dimensions}}) {
        $cmd_options .= " 'Name=$entry->{Name},Value=$entry->{Value}'";
    }
    $cmd_options .= " --endpoint-url $self->{endpoint_url}" if (defined($self->{endpoint_url}) && $self->{endpoint_url} ne '');

    return $cmd_options; 
}

sub cloudwatch_get_metrics {
    my ($self, %options) = @_;
    
    my $metric_results = {};
    my $start_time = DateTime->now->subtract(seconds => $options{timeframe})->iso8601;
    my $end_time = DateTime->now->iso8601;

    foreach my $metric_name (@{$options{metrics}}) {
        my $cmd_options = $self->cloudwatch_get_metrics_set_cmd(%options, metric_name => $metric_name, start_time => $start_time, end_time => $end_time);
        my ($response) = 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 => $cmd_options);

        my $metric_result;
        eval {
            $metric_result = JSON::XS->new->utf8->decode($response);
        };
        if ($@) {
            $self->{output}->add_option_msg(short_msg => "Cannot decode json response: $@");
            $self->{output}->option_exit();
        }

        $metric_results->{$metric_result->{Label}} = { points => 0 };
        foreach my $point (@{$metric_result->{Datapoints}}) {
            if (defined($point->{Average})) {
                $metric_results->{$metric_result->{Label}}->{average} = 0 if (!defined($metric_results->{$metric_result->{Label}}->{average}));
                $metric_results->{$metric_result->{Label}}->{average} += $point->{Average};
            }
            if (defined($point->{Minimum})) {
                $metric_results->{$metric_result->{Label}}->{minimum} = $point->{Minimum}
                    if (!defined($metric_results->{$metric_result->{Label}}->{minimum}) || $point->{Minimum} < $metric_results->{$metric_result->{Label}}->{minimum});
            }
            if (defined($point->{Maximum})) {
                $metric_results->{$metric_result->{Label}}->{maximum} = $point->{Maximum}
                    if (!defined($metric_results->{$metric_result->{Label}}->{maximum}) || $point->{Maximum} > $metric_results->{$metric_result->{Label}}->{maximum});
            }
            if (defined($point->{Sum})) {
                $metric_results->{$metric_result->{Label}}->{sum} = 0 if (!defined($metric_results->{$metric_result->{Label}}->{sum}));
                $metric_results->{$metric_result->{Label}}->{sum} += $point->{Sum};
            }
            
            $metric_results->{$metric_result->{Label}}->{points}++;
        }
        
        if (defined($metric_results->{$metric_result->{Label}}->{average})) {
            $metric_results->{$metric_result->{Label}}->{average} /= $metric_results->{$metric_result->{Label}}->{points};
        }
    }
    
    return $metric_results;
}

sub cloudwatch_get_alarms_set_cmd {
    my ($self, %options) = @_;
    
    return if (defined($self->{option_results}->{command_options}) && $self->{option_results}->{command_options} ne '');
    my $cmd_options = "cloudwatch describe-alarms --region $options{region} --output json";
    $cmd_options .= " --endpoint-url $self->{endpoint_url}" if (defined($self->{endpoint_url}) && $self->{endpoint_url} ne '');
    return $cmd_options; 
}

sub cloudwatch_get_alarms {
    my ($self, %options) = @_;
    
    my $cmd_options = $self->cloudwatch_get_alarms_set_cmd(%options);
    my ($response) = 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 => $cmd_options
    );
    my $alarm_result;
    eval {
        $alarm_result = JSON::XS->new->utf8->decode($response);
    };
    if ($@) {
        $self->{output}->add_option_msg(short_msg => "Cannot decode json response: $@");
        $self->{output}->option_exit();
    }
    
    my $alarm_results = [];
    foreach my $alarm (@{$alarm_result->{MetricAlarms}}) {
        push @$alarm_results, {
            AlarmName => $alarm->{AlarmName},
            StateValue => $alarm->{StateValue},
            MetricName => $alarm->{MetricName},
            StateReason => $alarm->{StateReason},
            StateUpdatedTimestamp => $alarm->{StateUpdatedTimestamp},
        };
    }
    return $alarm_results;
}

sub cloudwatch_list_metrics_set_cmd {
    my ($self, %options) = @_;
    
    return if (defined($self->{option_results}->{command_options}) && $self->{option_results}->{command_options} ne '');
    my $cmd_options = "cloudwatch list-metrics --region $options{region} --output json";
    $cmd_options .= " --namespace $options{namespace}" if defined($options{namespace});
    $cmd_options .= " --metric-name $options{metric}" if defined($options{metric});
    $cmd_options .= " --endpoint-url $self->{endpoint_url}" if (defined($self->{endpoint_url}) && $self->{endpoint_url} ne '');
    return $cmd_options; 
}

sub cloudwatch_list_metrics {
    my ($self, %options) = @_;
    
    my $cmd_options = $self->cloudwatch_list_metrics_set_cmd(%options);
    my ($response) = 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 => $cmd_options
    );
    my $list_metrics;
    eval {
        $list_metrics = JSON::XS->new->utf8->decode($response);
    };
    if ($@) {
        $self->{output}->add_option_msg(short_msg => "Cannot decode json response: $@");
        $self->{output}->option_exit();
    }
    
    return $list_metrics->{Metrics};
}

sub ec2_get_instances_status_set_cmd {
    my ($self, %options) = @_;
    
    return if (defined($self->{option_results}->{command_options}) && $self->{option_results}->{command_options} ne '');
    my $cmd_options = "ec2 describe-instance-status --include-all-instances --no-dry-run --region $options{region} --output json";
    $cmd_options .= " --endpoint-url $self->{endpoint_url}" if (defined($self->{endpoint_url}) && $self->{endpoint_url} ne '');
    return $cmd_options; 
}

sub ec2_get_instances_status {
    my ($self, %options) = @_;
    
    my $cmd_options = $self->ec2_get_instances_status_set_cmd(%options);
    my ($response) = 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 => $cmd_options
    );
    my $list_instances;
    eval {
        $list_instances = JSON::XS->new->utf8->decode($response);
    };
    if ($@) {
        $self->{output}->add_option_msg(short_msg => "Cannot decode json response: $@");
        $self->{output}->option_exit();
    }
    
    my $instance_results = {};
    foreach (@{$list_instances->{InstanceStatuses}}) {
        $instance_results->{$_->{InstanceId}} = { state => $_->{InstanceState}->{Name}, 
                                                  status => => $_->{InstanceStatus}->{Status} };
    }
    
    return $instance_results;
}

sub ec2_list_resources_set_cmd {
    my ($self, %options) = @_;
    
    return if (defined($self->{option_results}->{command_options}) && $self->{option_results}->{command_options} ne '');
    my $cmd_options = "ec2 describe-instances --no-dry-run --region $options{region} --output json";
    $cmd_options .= " --endpoint-url $self->{endpoint_url}" if (defined($self->{endpoint_url}) && $self->{endpoint_url} ne '');
    return $cmd_options; 
}

sub ec2_list_resources {
    my ($self, %options) = @_;
    
    my $cmd_options = $self->ec2_list_resources_set_cmd(%options);
    my ($response) = 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 => $cmd_options
    );
    my $list_instances;
    eval {
        $list_instances = JSON::XS->new->utf8->decode($response);
    };
    if ($@) {
        $self->{output}->add_option_msg(short_msg => "Cannot decode json response: $@");
        $self->{output}->option_exit();
    }
    
    my $resource_results = [];
    foreach my $reservation (@{$list_instances->{Reservations}}) {
        foreach my $instance (@{$reservation->{Instances}}) {
            my @instance_tags;
            foreach my $tag (@{$instance->{Tags}}) {
                my %already = map { $_->{Name} => $_ } @{$resource_results};
                if ($tag->{Key} eq "aws:autoscaling:groupName") {
                    next if (defined($already{$tag->{Value}}));
                    push @{$resource_results}, { 
                        Name => $tag->{Value},
                        Type => 'asg',
                    };
                } elsif ($tag->{Key} eq "Name" && defined($tag->{Value})) {
                    push @instance_tags, $tag->{Value};
                }
            }
            push @{$resource_results}, { 
                Name => $instance->{InstanceId},
                Type => 'instance',
                AvailabilityZone => $instance->{Placement}->{AvailabilityZone},
                InstanceType => $instance->{InstanceType},
                State => $instance->{State}->{Name},
                Tags => join(",", @instance_tags),
            };
            
        }
    }
    
    return $resource_results;
}

sub asg_get_resources_set_cmd {
    my ($self, %options) = @_;
    
    return if (defined($self->{option_results}->{command_options}) && $self->{option_results}->{command_options} ne '');
    my $cmd_options = "autoscaling describe-auto-scaling-groups --region $options{region} --output json";
    $cmd_options .= " --endpoint-url $self->{endpoint_url}" if (defined($self->{endpoint_url}) && $self->{endpoint_url} ne '');
    return $cmd_options; 
}

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

    my $cmd_options = $self->asg_get_resources_set_cmd(%options);
    my ($response) = 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 => $cmd_options
    );
    
    my $autoscaling_groups;
    eval {
        $autoscaling_groups = JSON::XS->new->utf8->decode($response);
    };
    if ($@) {
        $self->{output}->add_option_msg(short_msg => "Cannot decode json response: $@");
        $self->{output}->option_exit();
    }
    
    return \@{$autoscaling_groups->{AutoScalingGroups}};
}

sub rds_get_instances_status_set_cmd {
    my ($self, %options) = @_;
    
    return if (defined($self->{option_results}->{command_options}) && $self->{option_results}->{command_options} ne '');
    my $cmd_options = "rds describe-db-instances --region $options{region} --output json";
    $cmd_options .= " --endpoint-url $self->{endpoint_url}" if (defined($self->{endpoint_url}) && $self->{endpoint_url} ne '');
    return $cmd_options; 
}

sub rds_get_instances_status {
    my ($self, %options) = @_;
    
    my $cmd_options = $self->rds_get_instances_status_set_cmd(%options);
    my ($response) = 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 => $cmd_options
    );
    my $list_instances;
    eval {
        $list_instances = JSON::XS->new->utf8->decode($response);
    };
    if ($@) {
        $self->{output}->add_option_msg(short_msg => "Cannot decode json response: $@");
        $self->{output}->option_exit();
    }
    
    my $instance_results = {};
    foreach (@{$list_instances->{DBInstances}}) {
        $instance_results->{$_->{DBInstanceIdentifier}} = { state => $_->{DBInstanceStatus} };
    }
    
    return $instance_results;
}

sub rds_list_instances_set_cmd {
    my ($self, %options) = @_;
    
    return if (defined($self->{option_results}->{command_options}) && $self->{option_results}->{command_options} ne '');
    my $cmd_options = "rds describe-db-instances --region $options{region} --output json";
    $cmd_options .= " --endpoint-url $self->{endpoint_url}" if (defined($self->{endpoint_url}) && $self->{endpoint_url} ne '');
    return $cmd_options; 
}

sub rds_list_instances {
    my ($self, %options) = @_;
    
    my $cmd_options = $self->rds_get_instances_status_set_cmd(%options);
    my ($response) = 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 => $cmd_options
    );
    my $list_instances;
    eval {
        $list_instances = JSON::XS->new->utf8->decode($response);
    };
    if ($@) {
        $self->{output}->add_option_msg(short_msg => "Cannot decode json response: $@");
        $self->{output}->option_exit();
    }
    
    my $instance_results = [];
    foreach my $instance (@{$list_instances->{DBInstances}}) {
        push @{$instance_results}, {
            Name => $instance->{DBInstanceIdentifier},
            AvailabilityZone => $instance->{AvailabilityZone},
            Engine => $instance->{Engine},
            StorageType => $instance->{StorageType},
            DBInstanceStatus => $instance->{DBInstanceStatus},
        };
    }
    
    return $instance_results;
}

sub rds_list_clusters_set_cmd {
    my ($self, %options) = @_;
    
    return if (defined($self->{option_results}->{command_options}) && $self->{option_results}->{command_options} ne '');
    my $cmd_options = "rds describe-db-clusters --region $options{region} --output json";
    $cmd_options .= " --endpoint-url $self->{endpoint_url}" if (defined($self->{endpoint_url}) && $self->{endpoint_url} ne '');
    return $cmd_options; 
}

sub rds_list_clusters {
    my ($self, %options) = @_;
    
    my $cmd_options = $self->rds_list_clusters_set_cmd(%options);
    my ($response) = 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 => $cmd_options
    );
    my $list_clusters;
    eval {
        $list_clusters = JSON::XS->new->utf8->decode($response);
    };
    if ($@) {
        $self->{output}->add_option_msg(short_msg => "Cannot decode json response: $@");
        $self->{output}->option_exit();
    }
    
    my $cluster_results = [];
    foreach my $cluster (@{$list_clusters->{DBClusters}}) {
        push @{$cluster_results}, {
            Name => $cluster->{DBClusterIdentifier},
            DatabaseName => $cluster->{DatabaseName},
            Engine => $cluster->{Engine},
            Status => $cluster->{Status},
        };
    }
    
    return $cluster_results;
}

1;

__END__

=head1 NAME

Amazon AWS

=head1 AWSCLI OPTIONS

Amazon AWS CLI

=over 8

=item B<--aws-secret-key>

Set AWS secret key.

=item B<--aws-access-key>

Set AWS access key.

=item B<--endpoint-url>

Override AWS service endpoint URL if necessary.

=item B<--region>

Set the region name (Required).

=item B<--period>

Set period in seconds.

=item B<--timeframe>

Set timeframe in seconds.

=item B<--statistic>

Set cloudwatch statistics (Can be: 'minimum', 'maximum', 'average', 'sum').

=item B<--zeroed>

Set metrics value to 0 if none. Usefull when CloudWatch
does not return value when not defined.

=item B<--timeout>

Set timeout in seconds (Default: 50).

=item B<--sudo>

Use 'sudo' to execute the command.

=item B<--command>

Command to get information (Default: 'aws').
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: none).

=back

=head1 DESCRIPTION

B<custom>.

=cut