defaults = {
    'apt': {
        'packages': {
            'docker-ce': {},
            'docker-ce-cli': {},
            'docker-compose-plugin': {},
        },
        'repos': {
            'docker': {
                'items': {
                    'deb https://download.docker.com/linux/debian {os_release} stable',
                },
            },
        },
    },
    'nftables': {
        'forward': {
            'docker-engine': [
                'ct state { related, established } accept',
                'ip saddr 172.16.0.0/12 accept',
            ],
        },
        'postrouting': {
            'docker-engine': [
                'ip saddr 172.16.0.0/12 masquerade',
            ],
        },
    },
    'docker-engine': {
        'config': {
            'iptables': False,
            'no-new-privileges': True,
        },
    },
    'zfs': {
        'datasets': {
            'tank/docker-data': {},
        },
    },
}


@metadata_reactor.provides(
    'icinga2_api/docker-engine/services',
)
def monitoring(metadata):
    services = {
        'DOCKER PROCESS': {
            'command_on_monitored_host': '/usr/lib/nagios/plugins/check_procs -C dockerd -c 1:',
        },
    }

    for app in metadata.get('docker-engine/containers', {}):
        services[f'DOCKER CONTAINER {app}'] = {
            'command_on_monitored_host': f'sudo /usr/local/share/icinga/plugins/check_docker_container {app}'
        }

    return {
        'icinga2_api': {
            'docker-engine': {
                'services': services,
            },
        },
    }


@metadata_reactor.provides(
    'backups/paths',
    'zfs/datasets',
)
def zfs(metadata):
    datasets = {}

    for app in metadata.get('docker-engine/containers', {}):
        datasets[f'tank/docker-data/{app}'] = {
            'mountpoint': f'/var/opt/docker-engine/{app}',
            'needed_by': {
                f'directory:/var/opt/docker-engine/{app}',
            },
        }

    return {
        'backups': {
            'paths': {
                v['mountpoint']
                for v in datasets.values()
            },
        },
        'zfs': {
            'datasets': datasets,
        },
    }