#   Copyright 2012-2013 OpenStack Foundation
#
#   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.
#

"""Volume v1 Snapshot action implementations"""

import copy
import functools
import logging

from cliff import columns as cliff_columns
from osc_lib.cli import format_columns
from osc_lib.cli import parseractions
from osc_lib.command import command
from osc_lib import exceptions
from osc_lib import utils

from openstackclient.i18n import _


LOG = logging.getLogger(__name__)


class VolumeIdColumn(cliff_columns.FormattableColumn):
    """Formattable column for volume ID column.

    Unlike the parent FormattableColumn class, the initializer of the
    class takes volume_cache as the second argument.
    osc_lib.utils.get_item_properties instantiate cliff FormattableColumn
    object with a single parameter "column value", so you need to pass
    a partially initialized class like
    ``functools.partial(VolumeIdColumn, volume_cache)``.
    """

    def __init__(self, value, volume_cache=None):
        super(VolumeIdColumn, self).__init__(value)
        self._volume_cache = volume_cache or {}

    def human_readable(self):
        """Return a volume name if available

        :rtype: either the volume ID or name
        """
        volume_id = self._value
        volume = volume_id
        if volume_id in self._volume_cache.keys():
            volume = self._volume_cache[volume_id].display_name
        return volume


class CreateVolumeSnapshot(command.ShowOne):
    _description = _("Create new volume snapshot")

    def get_parser(self, prog_name):
        parser = super(CreateVolumeSnapshot, self).get_parser(prog_name)
        parser.add_argument(
            'snapshot_name',
            metavar='<snapshot-name>',
            help=_('Name of the new snapshot'),
        )
        parser.add_argument(
            '--volume',
            metavar='<volume>',
            help=_('Volume to snapshot (name or ID) '
                   '(default is <snapshot-name>)'),
        )
        parser.add_argument(
            '--description',
            metavar='<description>',
            help=_('Description of the snapshot'),
        )
        parser.add_argument(
            '--force',
            dest='force',
            action='store_true',
            default=False,
            help=_('Create a snapshot attached to an instance. '
                   'Default is False'),
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        volume = parsed_args.volume
        if not parsed_args.volume:
            volume = parsed_args.snapshot_name
        volume_id = utils.find_resource(volume_client.volumes,
                                        volume).id
        snapshot = volume_client.volume_snapshots.create(
            volume_id,
            parsed_args.force,
            parsed_args.snapshot_name,
            parsed_args.description
        )

        snapshot._info.update(
            {'properties':
             format_columns.DictColumn(snapshot._info.pop('metadata'))}
        )

        return zip(*sorted(snapshot._info.items()))


class DeleteVolumeSnapshot(command.Command):
    _description = _("Delete volume snapshot(s)")

    def get_parser(self, prog_name):
        parser = super(DeleteVolumeSnapshot, self).get_parser(prog_name)
        parser.add_argument(
            'snapshots',
            metavar='<snapshot>',
            nargs="+",
            help=_('Snapshot(s) to delete (name or ID)'),
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        result = 0

        for i in parsed_args.snapshots:
            try:
                snapshot_id = utils.find_resource(
                    volume_client.volume_snapshots, i).id
                volume_client.volume_snapshots.delete(snapshot_id)
            except Exception as e:
                result += 1
                LOG.error(_("Failed to delete snapshot with "
                            "name or ID '%(snapshot)s': %(e)s"),
                          {'snapshot': i, 'e': e})

        if result > 0:
            total = len(parsed_args.snapshots)
            msg = (_("%(result)s of %(total)s snapshots failed "
                   "to delete.") % {'result': result, 'total': total})
            raise exceptions.CommandError(msg)


class ListVolumeSnapshot(command.Lister):
    _description = _("List volume snapshots")

    def get_parser(self, prog_name):
        parser = super(ListVolumeSnapshot, self).get_parser(prog_name)
        parser.add_argument(
            '--all-projects',
            action='store_true',
            default=False,
            help=_('Include all projects (admin only)'),
        )
        parser.add_argument(
            '--long',
            action='store_true',
            default=False,
            help=_('List additional fields in output'),
        )
        parser.add_argument(
            '--name',
            metavar='<name>',
            default=None,
            help=_('Filters results by a name.')
        )
        parser.add_argument(
            '--status',
            metavar='<status>',
            choices=['available', 'error', 'creating', 'deleting',
                     'error_deleting'],
            help=_("Filters results by a status. "
                   "('available', 'error', 'creating', 'deleting'"
                   " or 'error_deleting')")
        )
        parser.add_argument(
            '--volume',
            metavar='<volume>',
            default=None,
            help=_('Filters results by a volume (name or ID).')
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume

        if parsed_args.long:
            columns = ['ID', 'Display Name', 'Display Description', 'Status',
                       'Size', 'Created At', 'Volume ID', 'Metadata']
            column_headers = copy.deepcopy(columns)
            column_headers[6] = 'Volume'
            column_headers[7] = 'Properties'
        else:
            columns = ['ID', 'Display Name', 'Display Description', 'Status',
                       'Size']
            column_headers = copy.deepcopy(columns)

        # Always update Name and Description
        column_headers[1] = 'Name'
        column_headers[2] = 'Description'

        # Cache the volume list
        volume_cache = {}
        try:
            for s in volume_client.volumes.list():
                volume_cache[s.id] = s
        except Exception:
            # Just forget it if there's any trouble
            pass
        VolumeIdColumnWithCache = functools.partial(VolumeIdColumn,
                                                    volume_cache=volume_cache)

        volume_id = None
        if parsed_args.volume:
            volume_id = utils.find_resource(
                volume_client.volumes, parsed_args.volume).id

        search_opts = {
            'all_tenants': parsed_args.all_projects,
            'display_name': parsed_args.name,
            'status': parsed_args.status,
            'volume_id': volume_id,
        }

        data = volume_client.volume_snapshots.list(
            search_opts=search_opts)
        return (column_headers,
                (utils.get_item_properties(
                    s, columns,
                    formatters={'Metadata': format_columns.DictColumn,
                                'Volume ID': VolumeIdColumnWithCache},
                ) for s in data))


class SetVolumeSnapshot(command.Command):
    _description = _("Set volume snapshot properties")

    def get_parser(self, prog_name):
        parser = super(SetVolumeSnapshot, self).get_parser(prog_name)
        parser.add_argument(
            'snapshot',
            metavar='<snapshot>',
            help=_('Snapshot to modify (name or ID)')
        )
        parser.add_argument(
            '--name',
            metavar='<name>',
            help=_('New snapshot name')
        )
        parser.add_argument(
            '--description',
            metavar='<description>',
            help=_('New snapshot description')
        )
        parser.add_argument(
            "--no-property",
            dest="no_property",
            action="store_true",
            help=_("Remove all properties from <snapshot> "
                   "(specify both --no-property and --property to "
                   "remove the current properties before setting "
                   "new properties.)"),
        )
        parser.add_argument(
            '--property',
            metavar='<key=value>',
            action=parseractions.KeyValueAction,
            help=_('Property to add/change for this snapshot '
                   '(repeat option to set multiple properties)'),
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        snapshot = utils.find_resource(volume_client.volume_snapshots,
                                       parsed_args.snapshot)

        result = 0
        if parsed_args.no_property:
            try:
                key_list = snapshot.metadata.keys()
                volume_client.volume_snapshots.delete_metadata(
                    snapshot.id,
                    list(key_list),
                )
            except Exception as e:
                LOG.error(_("Failed to clean snapshot properties: %s"), e)
                result += 1

        if parsed_args.property:
            try:
                volume_client.volume_snapshots.set_metadata(
                    snapshot.id, parsed_args.property)
            except Exception as e:
                LOG.error(_("Failed to set snapshot property: %s"), e)
                result += 1

        kwargs = {}
        if parsed_args.name:
            kwargs['display_name'] = parsed_args.name
        if parsed_args.description:
            kwargs['display_description'] = parsed_args.description
        if kwargs:
            try:
                snapshot.update(**kwargs)
            except Exception as e:
                LOG.error(_("Failed to update snapshot display name "
                          "or display description: %s"), e)
                result += 1

        if result > 0:
            raise exceptions.CommandError(_("One or more of the "
                                          "set operations failed"))


class ShowVolumeSnapshot(command.ShowOne):
    _description = _("Display volume snapshot details")

    def get_parser(self, prog_name):
        parser = super(ShowVolumeSnapshot, self).get_parser(prog_name)
        parser.add_argument(
            'snapshot',
            metavar='<snapshot>',
            help=_('Snapshot to display (name or ID)')
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        snapshot = utils.find_resource(volume_client.volume_snapshots,
                                       parsed_args.snapshot)

        snapshot._info.update(
            {'properties':
             format_columns.DictColumn(snapshot._info.pop('metadata'))}
        )

        return zip(*sorted(snapshot._info.items()))


class UnsetVolumeSnapshot(command.Command):
    _description = _("Unset volume snapshot properties")

    def get_parser(self, prog_name):
        parser = super(UnsetVolumeSnapshot, self).get_parser(prog_name)
        parser.add_argument(
            'snapshot',
            metavar='<snapshot>',
            help=_('Snapshot to modify (name or ID)'),
        )
        parser.add_argument(
            '--property',
            metavar='<key>',
            action='append',
            help=_('Property to remove from snapshot '
                   '(repeat option to remove multiple properties)'),
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        snapshot = utils.find_resource(
            volume_client.volume_snapshots, parsed_args.snapshot)

        if parsed_args.property:
            volume_client.volume_snapshots.delete_metadata(
                snapshot.id,
                parsed_args.property,
            )