#
#   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 Volume action implementations"""

import copy
import logging

from osc_lib.cli import parseractions
from osc_lib.command import command
from osc_lib import exceptions
from osc_lib import utils
import six

from openstackclient.i18n import _
from openstackclient.identity import common as identity_common


LOG = logging.getLogger(__name__)


def _check_size_arg(args):
    """Check whether --size option is required or not.

    Require size parameter only in case when snapshot or source
    volume is not specified.
    """

    if ((args.snapshot or args.source or args.source_replicated)
            is None and args.size is None):
        msg = _("--size is a required option if snapshot "
                "or source volume is not specified.")
        raise exceptions.CommandError(msg)


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

    def get_parser(self, prog_name):
        parser = super(CreateVolume, self).get_parser(prog_name)
        parser.add_argument(
            "name",
            metavar="<name>",
            help=_("Volume name"),
        )
        parser.add_argument(
            "--size",
            metavar="<size>",
            type=int,
            help=_("Volume size in GB (Required unless --snapshot or "
                   "--source or --source-replicated is specified)"),
        )
        parser.add_argument(
            "--type",
            metavar="<volume-type>",
            help=_("Set the type of volume"),
        )
        source_group = parser.add_mutually_exclusive_group()
        source_group.add_argument(
            "--image",
            metavar="<image>",
            help=_("Use <image> as source of volume (name or ID)"),
        )
        source_group.add_argument(
            "--snapshot",
            metavar="<snapshot>",
            help=_("Use <snapshot> as source of volume (name or ID)"),
        )
        source_group.add_argument(
            "--source",
            metavar="<volume>",
            help=_("Volume to clone (name or ID)"),
        )
        source_group.add_argument(
            "--source-replicated",
            metavar="<replicated-volume>",
            help=_("Replicated volume to clone (name or ID)"),
        )
        parser.add_argument(
            "--description",
            metavar="<description>",
            help=_("Volume description"),
        )
        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 volume in <availability-zone>"),
        )
        parser.add_argument(
            "--consistency-group",
            metavar="consistency-group>",
            help=_("Consistency group where the new volume belongs to"),
        )
        parser.add_argument(
            "--property",
            metavar="<key=value>",
            action=parseractions.KeyValueAction,
            help=_("Set a property to this volume "
                   "(repeat option to set multiple properties)"),
        )
        parser.add_argument(
            "--hint",
            metavar="<key=value>",
            action=parseractions.KeyValueAction,
            help=_("Arbitrary scheduler hint key-value pairs to help boot "
                   "an instance (repeat option to set multiple hints)"),
        )
        parser.add_argument(
            "--multi-attach",
            action="store_true",
            help=_("Allow volume to be attached more than once "
                   "(default to False)")
        )
        bootable_group = parser.add_mutually_exclusive_group()
        bootable_group.add_argument(
            "--bootable",
            action="store_true",
            help=_("Mark volume as bootable")
        )
        bootable_group.add_argument(
            "--non-bootable",
            action="store_true",
            help=_("Mark volume as non-bootable (default)")
        )
        readonly_group = parser.add_mutually_exclusive_group()
        readonly_group.add_argument(
            "--read-only",
            action="store_true",
            help=_("Set volume to read-only access mode")
        )
        readonly_group.add_argument(
            "--read-write",
            action="store_true",
            help=_("Set volume to read-write access mode (default)")
        )
        return parser

    def take_action(self, parsed_args):
        _check_size_arg(parsed_args)
        identity_client = self.app.client_manager.identity
        volume_client = self.app.client_manager.volume
        image_client = self.app.client_manager.image

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

        replicated_source_volume = None
        if parsed_args.source_replicated:
            replicated_source_volume = utils.find_resource(
                volume_client.volumes,
                parsed_args.source_replicated).id

        consistency_group = None
        if parsed_args.consistency_group:
            consistency_group = utils.find_resource(
                volume_client.consistencygroups,
                parsed_args.consistency_group).id

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

        snapshot = None
        if parsed_args.snapshot:
            snapshot = utils.find_resource(
                volume_client.volume_snapshots,
                parsed_args.snapshot).id

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

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

        volume = volume_client.volumes.create(
            size=parsed_args.size,
            snapshot_id=snapshot,
            name=parsed_args.name,
            description=parsed_args.description,
            volume_type=parsed_args.type,
            user_id=user,
            project_id=project,
            availability_zone=parsed_args.availability_zone,
            metadata=parsed_args.property,
            imageRef=image,
            source_volid=source_volume,
            consistencygroup_id=consistency_group,
            source_replica=replicated_source_volume,
            multiattach=parsed_args.multi_attach,
            scheduler_hints=parsed_args.hint,
        )

        if parsed_args.bootable or parsed_args.non_bootable:
            try:
                volume_client.volumes.set_bootable(
                    volume.id, parsed_args.bootable)
            except Exception as e:
                LOG.error(_("Failed to set volume bootable property: %s"), e)
        if parsed_args.read_only or parsed_args.read_write:
            try:
                volume_client.volumes.update_readonly_flag(
                    volume.id,
                    parsed_args.read_only)
            except Exception as e:
                LOG.error(_("Failed to set volume read-only access "
                            "mode flag: %s"), e)

        # Remove key links from being displayed
        volume._info.update(
            {
                'properties': utils.format_dict(volume._info.pop('metadata')),
                'type': volume._info.pop('volume_type')
            }
        )
        volume._info.pop("links", None)
        return zip(*sorted(six.iteritems(volume._info)))


class DeleteVolume(command.Command):
    _description = _("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)")
        )
        group = parser.add_mutually_exclusive_group()
        group.add_argument(
            "--force",
            action="store_true",
            help=_("Attempt forced removal of volume(s), regardless of state "
                   "(defaults to False)")
        )
        group.add_argument(
            "--purge",
            action="store_true",
            help=_("Remove any snapshots along with volume(s) "
                   "(defaults to False)")
        )
        return parser

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

        for i in parsed_args.volumes:
            try:
                volume_obj = utils.find_resource(
                    volume_client.volumes, i)
                if parsed_args.force:
                    volume_client.volumes.force_delete(volume_obj.id)
                else:
                    volume_client.volumes.delete(volume_obj.id,
                                                 cascade=parsed_args.purge)
            except Exception as e:
                result += 1
                LOG.error(_("Failed to delete volume with "
                            "name or ID '%(volume)s': %(e)s"),
                          {'volume': i, 'e': e})

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


class ListVolume(command.Lister):
    _description = _("List volumes")

    def get_parser(self, prog_name):
        parser = super(ListVolume, self).get_parser(prog_name)
        parser.add_argument(
            '--project',
            metavar='<project>',
            help=_('Filter results by project (name or ID) (admin only)')
        )
        identity_common.add_project_domain_option_to_parser(parser)
        parser.add_argument(
            '--user',
            metavar='<user>',
            help=_('Filter results by user (name or ID) (admin only)')
        )
        identity_common.add_user_domain_option_to_parser(parser)
        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'),
        )
        parser.add_argument(
            '--marker',
            metavar='<marker>',
            help=_('The last volume ID of the previous page'),
        )
        parser.add_argument(
            '--limit',
            type=int,
            action=parseractions.NonNegativeAction,
            metavar='<limit>',
            help=_('Maximum number of volumes to display'),
        )
        return parser

    def take_action(self, parsed_args):

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

        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:
                    server = server_cache[server].name
                device = attachment['device']
                msg += 'Attached to %s on %s ' % (server, device)
            return msg

        if parsed_args.long:
            columns = [
                'ID',
                'Name',
                'Status',
                'Size',
                'Volume Type',
                'Bootable',
                'Attachments',
                'Metadata',
            ]
            column_headers = copy.deepcopy(columns)
            column_headers[1] = 'Display Name'
            column_headers[4] = 'Type'
            column_headers[6] = 'Attached to'
            column_headers[7] = 'Properties'
        else:
            columns = [
                'ID',
                'Name',
                'Status',
                'Size',
                'Attachments',
            ]
            column_headers = copy.deepcopy(columns)
            column_headers[1] = 'Display Name'
            column_headers[4] = '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

        project_id = None
        if parsed_args.project:
            project_id = identity_common.find_project(
                identity_client,
                parsed_args.project,
                parsed_args.project_domain).id

        user_id = None
        if parsed_args.user:
            user_id = identity_common.find_user(identity_client,
                                                parsed_args.user,
                                                parsed_args.user_domain).id

        # set value of 'all_tenants' when using project option
        all_projects = bool(parsed_args.project) or parsed_args.all_projects

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

        data = volume_client.volumes.list(
            search_opts=search_opts,
            marker=parsed_args.marker,
            limit=parsed_args.limit,
        )

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


class MigrateVolume(command.Command):
    _description = _("Migrate volume to a new host")

    def get_parser(self, prog_name):
        parser = super(MigrateVolume, self).get_parser(prog_name)
        parser.add_argument(
            'volume',
            metavar="<volume>",
            help=_("Volume to migrate (name or ID)")
        )
        parser.add_argument(
            '--host',
            metavar="<host>",
            required=True,
            help=_("Destination host (takes the form: host@backend-name#pool)")
        )
        parser.add_argument(
            '--force-host-copy',
            action="store_true",
            help=_("Enable generic host-based force-migration, "
                   "which bypasses driver optimizations")
        )
        lock_group = parser.add_mutually_exclusive_group()
        lock_group.add_argument(
            '--lock-volume',
            action="store_true",
            help=_("If specified, the volume state will be locked "
                   "and will not allow a migration to be aborted "
                   "(possibly by another operation)")
        )
        lock_group.add_argument(
            '--unlock-volume',
            action="store_true",
            help=_("If specified, the volume state will not be "
                   "locked and the a migration can be aborted "
                   "(default) (possibly by another operation)")
        )
        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)
        volume_client.volumes.migrate_volume(volume.id, parsed_args.host,
                                             parsed_args.force_host_copy,
                                             parsed_args.lock_volume,)


class SetVolume(command.Command):
    _description = _("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 modify (name or ID)'),
        )
        parser.add_argument(
            '--name',
            metavar='<name>',
            help=_('New volume name'),
        )
        parser.add_argument(
            '--size',
            metavar='<size>',
            type=int,
            help=_('Extend volume size in GB'),
        )
        parser.add_argument(
            '--description',
            metavar='<description>',
            help=_('New volume description'),
        )
        parser.add_argument(
            "--no-property",
            dest="no_property",
            action="store_true",
            help=_("Remove all properties from <volume> "
                   "(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=_('Set a property on this volume '
                   '(repeat option to set multiple properties)'),
        )
        parser.add_argument(
            '--image-property',
            metavar='<key=value>',
            action=parseractions.KeyValueAction,
            help=_('Set an image property on this volume '
                   '(repeat option to set multiple image properties)'),
        )
        parser.add_argument(
            "--state",
            metavar="<state>",
            choices=['available', 'error', 'creating', 'deleting',
                     'in-use', 'attaching', 'detaching', 'error_deleting',
                     'maintenance'],
            help=_('New volume state ("available", "error", "creating", '
                   '"deleting", "in-use", "attaching", "detaching", '
                   '"error_deleting" or "maintenance") (admin only) '
                   '(This option simply changes the state of the volume '
                   'in the database with no regard to actual status, '
                   'exercise caution when using)'),
        )
        parser.add_argument(
            '--type',
            metavar='<volume-type>',
            help=_('New volume type (name or ID)'),
        )
        parser.add_argument(
            '--retype-policy',
            metavar='<retype-policy>',
            choices=['never', 'on-demand'],
            help=_('Migration policy while re-typing volume '
                   '("never" or "on-demand", default is "never" ) '
                   '(available only when --type option is specified)'),
        )
        bootable_group = parser.add_mutually_exclusive_group()
        bootable_group.add_argument(
            "--bootable",
            action="store_true",
            help=_("Mark volume as bootable")
        )
        bootable_group.add_argument(
            "--non-bootable",
            action="store_true",
            help=_("Mark volume as non-bootable")
        )
        readonly_group = parser.add_mutually_exclusive_group()
        readonly_group.add_argument(
            "--read-only",
            action="store_true",
            help=_("Set volume to read-only access mode")
        )
        readonly_group.add_argument(
            "--read-write",
            action="store_true",
            help=_("Set volume to read-write access mode")
        )
        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)

        result = 0
        if parsed_args.size:
            try:
                if volume.status != 'available':
                    msg = (_("Volume is in %s state, it must be available "
                           "before size can be extended") % volume.status)
                    raise exceptions.CommandError(msg)
                if parsed_args.size <= volume.size:
                    msg = (_("New size must be greater than %s GB")
                           % volume.size)
                    raise exceptions.CommandError(msg)
                volume_client.volumes.extend(volume.id, parsed_args.size)
            except Exception as e:
                LOG.error(_("Failed to set volume size: %s"), e)
                result += 1

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

        if parsed_args.property:
            try:
                volume_client.volumes.set_metadata(
                    volume.id, parsed_args.property)
            except Exception as e:
                LOG.error(_("Failed to set volume property: %s"), e)
                result += 1
        if parsed_args.image_property:
            try:
                volume_client.volumes.set_image_metadata(
                    volume.id, parsed_args.image_property)
            except Exception as e:
                LOG.error(_("Failed to set image property: %s"), e)
                result += 1
        if parsed_args.state:
            try:
                volume_client.volumes.reset_state(
                    volume.id, parsed_args.state)
            except Exception as e:
                LOG.error(_("Failed to set volume state: %s"), e)
                result += 1
        if parsed_args.bootable or parsed_args.non_bootable:
            try:
                volume_client.volumes.set_bootable(
                    volume.id, parsed_args.bootable)
            except Exception as e:
                LOG.error(_("Failed to set volume bootable property: %s"), e)
                result += 1
        if parsed_args.read_only or parsed_args.read_write:
            try:
                volume_client.volumes.update_readonly_flag(
                    volume.id,
                    parsed_args.read_only)
            except Exception as e:
                LOG.error(_("Failed to set volume read-only access "
                            "mode flag: %s"), e)
                result += 1
        if parsed_args.type:
            # get the migration policy
            migration_policy = 'never'
            if parsed_args.retype_policy:
                migration_policy = parsed_args.retype_policy
            try:
                # find the volume type
                volume_type = utils.find_resource(
                    volume_client.volume_types,
                    parsed_args.type)
                # reset to the new volume type
                volume_client.volumes.retype(
                    volume.id,
                    volume_type.id,
                    migration_policy)
            except Exception as e:
                LOG.error(_("Failed to set volume type: %s"), e)
                result += 1
        elif parsed_args.retype_policy:
            # If the "--retype-policy" is specified without "--type"
            LOG.warning(_("'--retype-policy' option will not work "
                          "without '--type' option"))

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

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


class ShowVolume(command.ShowOne):
    _description = _("Display 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)

        # Special mapping for columns to make the output easier to read:
        # 'metadata' --> 'properties'
        # 'volume_type' --> 'type'
        volume._info.update(
            {
                'properties': utils.format_dict(volume._info.pop('metadata')),
                'type': volume._info.pop('volume_type'),
            },
        )

        # Remove key links from being displayed
        volume._info.pop("links", None)
        return zip(*sorted(six.iteritems(volume._info)))


class UnsetVolume(command.Command):
    _description = _("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',
            help=_('Remove a property from volume '
                   '(repeat option to remove multiple properties)'),
        )
        parser.add_argument(
            '--image-property',
            metavar='<key>',
            action='append',
            help=_('Remove an image property from volume '
                   '(repeat option to remove multiple image 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)

        result = 0
        if parsed_args.property:
            try:
                volume_client.volumes.delete_metadata(
                    volume.id, parsed_args.property)
            except Exception as e:
                LOG.error(_("Failed to unset volume property: %s"), e)
                result += 1

        if parsed_args.image_property:
            try:
                volume_client.volumes.delete_image_metadata(
                    volume.id, parsed_args.image_property)
            except Exception as e:
                LOG.error(_("Failed to unset image property: %s"), e)
                result += 1

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