from json import dumps
from os.path import join

from bundlewrap.metadata import MetadataJSONEncoder

actions = {
    # For some reason, this module doesn't get auto-loaded on debian,
    # even if installation of zfsutils-linux tries to start
    # zfs-mount.service. We have no choice but to do it manually.
    'modprobe_zfs': {
        'command': 'modprobe zfs',
        'unless': 'lsmod | grep ^zfs',
        'needs': {
            'pkg_apt:zfs-dkms',
        },
        'needed_by': {
            'pkg_apt:zfs-zed',
            'pkg_apt:zfsutils-linux',
            'zfs_dataset:',
            'zfs_pool:',
        },
    },
}

files = {
    '/etc/modprobe.d/zfs.conf': {
        'source': 'zfs-modprobe.conf',
        'content_type': 'mako',
        'mode': '0755',
    },
    '/etc/zfs-snapshot-config.json': {
        'content': dumps(
            node.metadata.get('zfs', {}).get('snapshots', {}),
            cls=MetadataJSONEncoder,  # turns sets into sorted lists
            indent=4,
            sort_keys=True,
        ) + '\n',
    },
    '/etc/zfs/zed.d/zed.rc': {
        'content': 'ZED_EMAIL_ADDR="hostmaster@kunbox.net"\nZED_EMAIL_PROG="mail"\nZED_NOTIFY_INTERVAL_SECS=3600\n',
        'mode': '0600',
        'triggers': {
            'svc_systemd:zfs-zed:restart'
        },
    },
    '/usr/local/sbin/zfs-auto-snapshot': {
        'mode': '0755',
    },
    '/usr/local/share/icinga/plugins/check_zfs_auto_snapshot': {
        'mode': '0755',
    },
    '/usr/local/share/icinga/plugins/check_zfs_old_snapshots': {
        'mode': '0755',
    },
    "/usr/local/share/icinga/plugins/check_zfs_volumes": {
        'mode': '0755',
        'content_type': 'mako',
    },
    "/usr/local/share/icinga/plugins/check_zpool_online": {
        'mode': '0755',
    },
    "/usr/local/share/icinga/plugins/check_zpool_space": {
        'mode': '0755',
    },
}

svc_systemd = {
    'zfs-zed': {
        'needs': {
            'pkg_apt:zfs-zed'
        },
    },
}

zfs_datasets = node.metadata.get('zfs', {}).get('datasets', {})
zfs_pools = {}

for name, attrs in node.metadata.get('zfs', {}).get('pools', {}).items():
    zfs_pools[name] = attrs

    # Not yet supported on debian buster
    #actions[f'pool_{name}_enable_trim'] = {
    #    'command': f'zpool set autotrim=on {name}',
    #    'unless':  f'zpool get autotrim -H -o value {name} | grep -q on',
    #    'needs':   [
    #        f'zfs_pool:{name}'
    #    ]
    #}

directories = {
    "/etc/zfs-snapshot-backup-pre.d": {
        'purge': True,
    },
    "/etc/zfs-snapshot-backup-post.d": {
        'purge': True,
    },
    "/etc/zfs-snapshot-backup-final.d": {
        'purge': True,
    },
}

# TODO implement when we start managing backups via bundlewrap
#if node.metadata.get('zfs', {}).get('snapshots', {}).get('backup', {}).get('enabled', True):
#    directories["/mnt/zfs-snapshot-backup"] = {}
#
#    files["/usr/local/sbin/zfs-backup-snapshot"] = {
#        'content_type': 'mako',
#        'context': {
#            # Set by our own metadata processor, guaranteed to exist.
#            'filesystems': node.metadata['zfs']['snapshots']['backup']['filesystems_with_snapshot'],
#        },
#        'mode': '0755',
#    }
#    files["/usr/local/sbin/zfs-backup-snapshot-unmount"] = {
#        'content_type': 'mako',
#        'context': {
#            # Set by our own metadata processor, guaranteed to exist.
#            'filesystems': node.metadata['zfs']['snapshots']['backup']['filesystems_with_snapshot'],
#        },
#        'mode': '0755',
#    }
#
#else:
#    files["/mnt/zfs-snapshot-backup"] = {'delete': True}