#   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 Volume action implementations"""

import argparse
import six

from openstackclient.common import command
from openstackclient.common import parseractions
from openstackclient.common import utils


class CreateVolume(command.ShowOne):
    """Create new volume"""

    def get_parser(self, prog_name):
        parser = super(CreateVolume, self).get_parser(prog_name)
        parser.add_argument(
            'name',
            metavar='<name>',
            help='New volume name',
        )
        parser.add_argument(
            '--size',
            metavar='<size>',
            required=True,
            type=int,
            help='New volume size in GB',
        )
        snapshot_group = parser.add_mutually_exclusive_group()
        snapshot_group.add_argument(
            '--snapshot',
            metavar='<snapshot>',
            help='Use <snapshot> as source of new volume',
        )
        snapshot_group.add_argument(
            '--snapshot-id',
            metavar='<snapshot-id>',
            help=argparse.SUPPRESS,
        )
        parser.add_argument(
            '--description',
            metavar='<description>',
            help='New volume description',
        )
        parser.add_argument(
            '--type',
            metavar='<volume-type>',
            help='Use <volume-type> as the new volume type',
        )
        parser.add_argument(
            '--user',
            metavar='<user>',
            help='Specify an alternate user (name or ID)',
        )
        parser.add_argument(
            '--project',
            metavar='<project>',
            help='Specify an alternate project (name or ID)',
        )
        parser.add_argument(
            '--availability-zone',
            metavar='<availability-zone>',
            help='Create new volume in <availability-zone>',
        )
        parser.add_argument(
            '--image',
            metavar='<image>',
            help='Use <image> as source of new volume (name or ID)',
        )
        parser.add_argument(
            '--source',
            metavar='<volume>',
            help='Volume to clone (name or ID)',
        )
        parser.add_argument(
            '--property',
            metavar='<key=value>',
            action=parseractions.KeyValueAction,
            help='Set a property on this volume '
                 '(repeat option to set multiple properties)',
        )

        return parser

    def take_action(self, parsed_args):

        identity_client = self.app.client_manager.identity
        image_client = self.app.client_manager.image
        volume_client = self.app.client_manager.volume

        source_volume = None
        if parsed_args.source:
            source_volume = utils.find_resource(
                volume_client.volumes,
                parsed_args.source,
            ).id

        project = None
        if parsed_args.project:
            project = utils.find_resource(
                identity_client.tenants,
                parsed_args.project,
            ).id

        user = None
        if parsed_args.user:
            user = utils.find_resource(
                identity_client.users,
                parsed_args.user,
            ).id

        image = None
        if parsed_args.image:
            image = utils.find_resource(
                image_client.images,
                parsed_args.image,
            ).id

        snapshot = parsed_args.snapshot or parsed_args.snapshot_id

        volume = volume_client.volumes.create(
            parsed_args.size,
            snapshot,
            source_volume,
            parsed_args.name,
            parsed_args.description,
            parsed_args.type,
            user,
            project,
            parsed_args.availability_zone,
            parsed_args.property,
            image,
        )
        # Map 'metadata' column to 'properties'
        volume._info.update(
            {
                'properties': utils.format_dict(volume._info.pop('metadata')),
                'type': volume._info.pop('volume_type'),
            },
        )

        return zip(*sorted(six.iteritems(volume._info)))


class DeleteVolume(command.Command):
    """Delete volume(s)"""

    def get_parser(self, prog_name):
        parser = super(DeleteVolume, self).get_parser(prog_name)
        parser.add_argument(
            'volumes',
            metavar='<volume>',
            nargs="+",
            help='Volume(s) to delete (name or ID)',
        )
        parser.add_argument(
            '--force',
            dest='force',
            action='store_true',
            default=False,
            help='Attempt forced removal of volume(s), regardless of state '
                 '(defaults to False)',
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        for volume in parsed_args.volumes:
            volume_obj = utils.find_resource(
                volume_client.volumes, volume)
            if parsed_args.force:
                volume_client.volumes.force_delete(volume_obj.id)
            else:
                volume_client.volumes.delete(volume_obj.id)


class ListVolume(command.Lister):
    """List volumes"""

    def get_parser(self, prog_name):
        parser = super(ListVolume, self).get_parser(prog_name)
        parser.add_argument(
            '--name',
            metavar='<name>',
            help='Filter results by volume name',
        )
        parser.add_argument(
            '--status',
            metavar='<status>',
            help='Filter results by status',
        )
        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',
        )
        return parser

    def take_action(self, parsed_args):

        volume_client = self.app.client_manager.volume
        compute_client = self.app.client_manager.compute

        def _format_attach(attachments):
            """Return a formatted string of a volume's attached instances

            :param attachments: a volume.attachments field
            :rtype: a string of formatted instances
            """

            msg = ''
            for attachment in attachments:
                server = attachment['server_id']
                if server in server_cache.keys():
                    server = server_cache[server].name
                device = attachment['device']
                msg += 'Attached to %s on %s ' % (server, device)
            return msg

        if parsed_args.long:
            columns = (
                'ID',
                'Display Name',
                'Status',
                'Size',
                'Volume Type',
                'Bootable',
                'Attachments',
                'Metadata',
            )
            column_headers = (
                'ID',
                'Display Name',
                'Status',
                'Size',
                'Type',
                'Bootable',
                'Attached to',
                'Properties',
            )
        else:
            columns = (
                'ID',
                'Display Name',
                'Status',
                'Size',
                'Attachments',
            )
            column_headers = (
                'ID',
                'Display Name',
                'Status',
                'Size',
                'Attached to',
            )

        # Cache the server list
        server_cache = {}
        try:
            for s in compute_client.servers.list():
                server_cache[s.id] = s
        except Exception:
            # Just forget it if there's any trouble
            pass

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

        data = volume_client.volumes.list(search_opts=search_opts)

        return (column_headers,
                (utils.get_item_properties(
                    s, columns,
                    formatters={'Metadata': utils.format_dict,
                                'Attachments': _format_attach},
                ) for s in data))


class SetVolume(command.Command):
    """Set volume properties"""

    def get_parser(self, prog_name):
        parser = super(SetVolume, self).get_parser(prog_name)
        parser.add_argument(
            'volume',
            metavar='<volume>',
            help='Volume to change (name or ID)',
        )
        parser.add_argument(
            '--name',
            metavar='<name>',
            help='New volume name',
        )
        parser.add_argument(
            '--description',
            metavar='<description>',
            help='New volume description',
        )
        parser.add_argument(
            '--size',
            metavar='<size>',
            type=int,
            help='Extend volume size in GB',
        )
        parser.add_argument(
            '--property',
            metavar='<key=value>',
            action=parseractions.KeyValueAction,
            help='Property to add or modify for this volume '
                 '(repeat option to set multiple properties)',
        )
        return parser

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

        if parsed_args.size:
            if volume.status != 'available':
                self.app.log.error("Volume is in %s state, it must be "
                                   "available before size can be extended" %
                                   volume.status)
                return
            if parsed_args.size <= volume.size:
                self.app.log.error("New size must be greater than %s GB" %
                                   volume.size)
                return
            volume_client.volumes.extend(volume.id, parsed_args.size)

        if parsed_args.property:
            volume_client.volumes.set_metadata(volume.id, parsed_args.property)

        kwargs = {}
        if parsed_args.name:
            kwargs['display_name'] = parsed_args.name
        if parsed_args.description:
            kwargs['display_description'] = parsed_args.description
        if kwargs:
            volume_client.volumes.update(volume.id, **kwargs)

        if not kwargs and not parsed_args.property and not parsed_args.size:
            self.app.log.error("No changes requested\n")


class ShowVolume(command.ShowOne):
    """Show volume details"""

    def get_parser(self, prog_name):
        parser = super(ShowVolume, self).get_parser(prog_name)
        parser.add_argument(
            'volume',
            metavar='<volume>',
            help='Volume to display (name or ID)',
        )
        return parser

    def take_action(self, parsed_args):
        volume_client = self.app.client_manager.volume
        volume = utils.find_resource(volume_client.volumes, parsed_args.volume)
        # Map 'metadata' column to 'properties'
        volume._info.update(
            {
                'properties': utils.format_dict(volume._info.pop('metadata')),
                'type': volume._info.pop('volume_type'),
            },
        )
        if 'os-vol-tenant-attr:tenant_id' in volume._info:
            volume._info.update(
                {'project_id': volume._info.pop(
                    'os-vol-tenant-attr:tenant_id')}
            )
        return zip(*sorted(six.iteritems(volume._info)))


class UnsetVolume(command.Command):
    """Unset volume properties"""

    def get_parser(self, prog_name):
        parser = super(UnsetVolume, self).get_parser(prog_name)
        parser.add_argument(
            'volume',
            metavar='<volume>',
            help='Volume to modify (name or ID)',
        )
        parser.add_argument(
            '--property',
            metavar='<key>',
            action='append',
            default=[],
            help='Property to remove from volume '
                 '(repeat option to remove multiple properties)',
            required=True,
        )
        return parser

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

        if parsed_args.property:
            volume_client.volumes.delete_metadata(
                volume.id,
                parsed_args.property,
            )
        else:
            self.app.log.error("No changes requested\n")