# Copyright 2014 Red Hat, Inc.
#
# 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.

import json
import logging

from cliff import command
from cliff import lister
from cliff import show

from openstackclient.common import utils


class CreateQueue(show.ShowOne):
    """Create a queue."""

    log = logging.getLogger(__name__ + ".CreateQueue")

    def get_parser(self, prog_name):
        parser = super(CreateQueue, self).get_parser(prog_name)
        parser.add_argument(
            "queue_name",
            metavar="<queue_name>",
            help="Name of the queue")
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)" % parsed_args)

        client = self.app.client_manager.messaging

        queue_name = parsed_args.queue_name
        data = client.queue(queue_name)

        columns = ('Name',)
        return columns, utils.get_item_properties(data, columns)


class DeleteQueue(command.Command):
    """Delete a queue."""

    log = logging.getLogger(__name__ + ".DeleteQueue")

    def get_parser(self, prog_name):
        parser = super(DeleteQueue, self).get_parser(prog_name)
        parser.add_argument(
            "queue_name",
            metavar="<queue_name>",
            help="Name of the queue")
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)" % parsed_args)
        client = self.app.client_manager.messaging

        queue_name = parsed_args.queue_name

        client.queue(queue_name).delete()


class ListQueues(lister.Lister):
    """List available queues."""

    log = logging.getLogger(__name__ + ".ListQueues")

    def get_parser(self, prog_name):
        parser = super(ListQueues, self).get_parser(prog_name)
        parser.add_argument(
            "--marker",
            metavar="<queue_id>",
            help="Queue's paging marker")
        parser.add_argument(
            "--limit",
            metavar="<limit>",
            help="Page size limit")

        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)" % parsed_args)

        client = self.app.client_manager.messaging

        kwargs = {}
        if parsed_args.marker is not None:
            kwargs["marker"] = parsed_args.marker
        if parsed_args.limit is not None:
            kwargs["limit"] = parsed_args.limit

        data = client.queues(**kwargs)
        columns = ("Name", )
        return (columns,
                (utils.get_item_properties(s, columns) for s in data))


class CheckQueueExistence(show.ShowOne):
    """Check queue existence."""

    log = logging.getLogger(__name__ + ".CheckQueueExistence")

    def get_parser(self, prog_name):
        parser = super(CheckQueueExistence, self).get_parser(prog_name)
        parser.add_argument(
            "queue_name",
            metavar="<queue_name>",
            help="Name of the queue")
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)" % parsed_args)

        client = self.app.client_manager.messaging

        queue_name = parsed_args.queue_name
        queue = client.queue(queue_name, auto_create=False)

        columns = ('Exists',)
        data = dict(exists=queue.exists())
        return columns, utils.get_dict_properties(data, columns)


class SetQueueMetadata(command.Command):
    """Set queue metadata."""

    log = logging.getLogger(__name__ + ".SetQueueMetadata")

    def get_parser(self, prog_name):
        parser = super(SetQueueMetadata, self).get_parser(prog_name)
        parser.add_argument(
            "queue_name",
            metavar="<queue_name>",
            help="Name of the queue")
        parser.add_argument(
            "queue_metadata",
            metavar="<queue_metadata>",
            help="Queue metadata")
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)" % parsed_args)

        client = self.app.client_manager.messaging

        queue_name = parsed_args.queue_name
        queue_metadata = parsed_args.queue_metadata
        queue_exists = client.queue(queue_name, auto_create=False).exists()

        if not queue_exists:
            raise RuntimeError("Queue(%s) does not exist." % queue_name)

        try:
            valid_metadata = json.loads(queue_metadata)
        except ValueError:
            raise RuntimeError("Queue metadata(%s) is not a valid json." %
                               queue_metadata)

        client.queue(queue_name, auto_create=False).\
            metadata(new_meta=valid_metadata)


class GetQueueMetadata(show.ShowOne):
    """Get queue metadata."""

    log = logging.getLogger(__name__ + ".GetQueueMetadata")

    def get_parser(self, prog_name):
        parser = super(GetQueueMetadata, self).get_parser(prog_name)
        parser.add_argument(
            "queue_name",
            metavar="<queue_name>",
            help="Name of the queue")
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)" % parsed_args)

        client = self.app.client_manager.messaging

        queue_name = parsed_args.queue_name
        queue = client.queue(queue_name, auto_create=False)

        if not queue.exists():
            raise RuntimeError("Queue(%s) does not exist." % queue_name)

        columns = ("Metadata",)
        data = dict(metadata=queue.metadata())
        return columns, utils.get_dict_properties(data, columns)


class GetQueueStats(show.ShowOne):
    """Get queue stats."""

    log = logging.getLogger(__name__ + ".GetQueueStats")

    def get_parser(self, prog_name):
        parser = super(GetQueueStats, self).get_parser(prog_name)
        parser.add_argument(
            "queue_name",
            metavar="<queue_name>",
            help="Name of the queue")
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)" % parsed_args)

        client = self.app.client_manager.messaging

        queue_name = parsed_args.queue_name
        queue = client.queue(queue_name, auto_create=False)

        if not queue.exists():
            raise RuntimeError('Queue(%s) does not exist.' % queue_name)

        columns = ("Stats",)
        data = dict(stats=queue.stats)
        return columns, utils.get_dict_properties(data, columns)


class CreatePool(show.ShowOne):
    """Create a pool."""

    log = logging.getLogger(__name__ + ".CreatePool")

    def get_parser(self, prog_name):
        parser = super(CreatePool, self).get_parser(prog_name)
        parser.add_argument(
            "pool_name",
            metavar="<pool_name>",
            help="Name of the pool")
        parser.add_argument(
            "pool_uri",
            metavar="<pool_uri>",
            help="Storage engine URI")
        parser.add_argument(
            "pool_weight",
            metavar="<pool_weight>",
            help="weight of the pool")
        parser.add_argument(
            "pool_group",
            metavar="<pool_group>",
            help="Group of the pool")
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)" % parsed_args)

        client = self.app.client_manager.messaging

        args = {
            parsed_args.name,
            parsed_args.uri,
            parsed_args.weight,
            parsed_args.group,
        }
        pool_name = parsed_args.pool_name
        data = client.pool(args, auto_create=False)

        if not data.exists():
            raise RuntimeError('Pool(%s) does not exist.' % pool_name)

        columns = ('Name',)
        return columns, utils.get_item_properties(data, columns)