#
#   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 v2 transfer action implementations"""

import logging

from cinderclient import api_versions
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 AcceptTransferRequest(command.ShowOne):
    _description = _("Accept volume transfer request.")

    def get_parser(self, prog_name):
        parser = super(AcceptTransferRequest, self).get_parser(prog_name)
        parser.add_argument(
            'transfer_request',
            metavar="<transfer-request-id>",
            help=_('Volume transfer request to accept (ID only)'),
        )
        parser.add_argument(
            '--auth-key',
            metavar="<key>",
            required=True,
            help=_('Volume transfer request authentication key'),
        )
        return parser

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

        try:
            transfer_request_id = utils.find_resource(
                volume_client.transfers,
                parsed_args.transfer_request
            ).id
        except exceptions.CommandError:
            # Non-admin users will fail to lookup name -> ID so we just
            # move on and attempt with the user-supplied information
            transfer_request_id = parsed_args.transfer_request

        transfer_accept = volume_client.transfers.accept(
            transfer_request_id,
            parsed_args.auth_key,
        )
        transfer_accept._info.pop("links", None)

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


class CreateTransferRequest(command.ShowOne):
    _description = _("Create volume transfer request.")

    def get_parser(self, prog_name):
        parser = super(CreateTransferRequest, self).get_parser(prog_name)
        parser.add_argument(
            '--name',
            metavar="<name>",
            help=_('New transfer request name (default to None)'),
        )
        parser.add_argument(
            '--snapshots',
            action='store_true',
            dest='snapshots',
            help=_(
                'Allow transfer volumes without snapshots (default) '
                '(supported by --os-volume-api-version 3.55 or later)'
            ),
            default=None,
        )
        parser.add_argument(
            '--no-snapshots',
            action='store_false',
            dest='snapshots',
            help=_(
                'Disallow transfer volumes without snapshots '
                '(supported by --os-volume-api-version 3.55 or later)'
            ),
        )
        parser.add_argument(
            'volume',
            metavar="<volume>",
            help=_('Volume to transfer (name or ID)'),
        )
        return parser

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

        kwargs = {}

        if parsed_args.snapshots is not None:
            if volume_client.api_version < api_versions.APIVersion('3.55'):
                msg = _(
                    "--os-volume-api-version 3.55 or greater is required to "
                    "support the '--(no-)snapshots' option"
                )
                raise exceptions.CommandError(msg)

            # unfortunately this option is negative so we have to reverse
            # things
            kwargs['no_snapshots'] = not parsed_args.snapshots

        volume_id = utils.find_resource(
            volume_client.volumes,
            parsed_args.volume,
        ).id
        volume_transfer_request = volume_client.transfers.create(
            volume_id,
            parsed_args.name,
            **kwargs,
        )
        volume_transfer_request._info.pop("links", None)

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


class DeleteTransferRequest(command.Command):
    _description = _("Delete volume transfer request(s).")

    def get_parser(self, prog_name):
        parser = super(DeleteTransferRequest, self).get_parser(prog_name)
        parser.add_argument(
            'transfer_request',
            metavar="<transfer-request>",
            nargs="+",
            help=_('Volume transfer request(s) to delete (name or ID)'),
        )
        return parser

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

        for t in parsed_args.transfer_request:
            try:
                transfer_request_id = utils.find_resource(
                    volume_client.transfers,
                    t,
                ).id
                volume_client.transfers.delete(transfer_request_id)
            except Exception as e:
                result += 1
                LOG.error(_("Failed to delete volume transfer request "
                            "with name or ID '%(transfer)s': %(e)s")
                          % {'transfer': t, 'e': e})

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


class ListTransferRequest(command.Lister):
    _description = _("Lists all volume transfer requests.")

    def get_parser(self, prog_name):
        parser = super(ListTransferRequest, self).get_parser(prog_name)
        parser.add_argument(
            '--all-projects',
            dest='all_projects',
            action="store_true",
            default=False,
            help=_('Include all projects (admin only)'),
        )
        return parser

    def take_action(self, parsed_args):
        columns = ['ID', 'Name', 'Volume ID']
        column_headers = ['ID', 'Name', 'Volume']

        volume_client = self.app.client_manager.volume

        volume_transfer_result = volume_client.transfers.list(
            detailed=True,
            search_opts={'all_tenants': parsed_args.all_projects},
        )

        return (column_headers, (
            utils.get_item_properties(s, columns)
            for s in volume_transfer_result))


class ShowTransferRequest(command.ShowOne):
    _description = _("Show volume transfer request details.")

    def get_parser(self, prog_name):
        parser = super(ShowTransferRequest, self).get_parser(prog_name)
        parser.add_argument(
            'transfer_request',
            metavar="<transfer-request>",
            help=_('Volume transfer request to display (name or ID)'),
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        volume_transfer_request = utils.find_resource(
            volume_client.transfers,
            parsed_args.transfer_request,
        )
        volume_transfer_request._info.pop("links", None)

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