# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2011 OpenStack Foundation
# Copyright 2013 Rackspace Hosting
# All Rights Reserved.
#
#    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.

from troveclient import base
from troveclient import common
from troveclient.openstack.common.py3kcompat import urlutils


class Database(base.Resource):
    """
    According to Wikipedia, "A database is a system intended to organize,
    store, and retrieve
    large amounts of data easily."
    """
    def __repr__(self):
        return "<Database: %s>" % self.name


class Databases(base.ManagerWithFind):
    """
    Manage :class:`Databases` resources.
    """
    resource_class = Database

    def create(self, instance_id, databases):
        """
        Create new databases within the specified instance
        """
        body = {"databases": databases}
        url = "/instances/%s/databases" % instance_id
        resp, body = self.api.client.post(url, body=body)
        common.check_for_exceptions(resp, body)

    def delete(self, instance_id, dbname):
        """Delete an existing database in the specified instance"""
        url = "/instances/%s/databases/%s" % (instance_id, dbname)
        resp, body = self.api.client.delete(url)
        common.check_for_exceptions(resp, body)

    def _list(self, url, response_key, limit=None, marker=None):
        resp, body = self.api.client.get(common.limit_url(url, limit, marker))
        common.check_for_exceptions(resp, body)
        if not body:
            raise Exception("Call to " + url +
                            " did not return a body.")
        links = body.get('links', [])
        next_links = [link['href'] for link in links if link['rel'] == 'next']
        next_marker = None
        for link in next_links:
            # Extract the marker from the url.
            parsed_url = urlutils.urlparse(link)
            query_dict = dict(urlutils.parse_qsl(parsed_url.query))
            next_marker = query_dict.get('marker', None)
        databases = body[response_key]
        databases = [self.resource_class(self, res) for res in databases]
        return common.Paginated(
            databases, next_marker=next_marker, links=links
        )

    def list(self, instance, limit=None, marker=None):
        """
        Get a list of all Databases from the instance.

        :rtype: list of :class:`Database`.
        """
        return self._list("/instances/%s/databases" % base.getid(instance),
                          "databases", limit, marker)

#    def get(self, instance, database):
#        """
#        Get a specific instances.
#
#        :param flavor: The ID of the :class:`Database` to get.
#        :rtype: :class:`Database`
#        """
#        assert isinstance(instance, Instance)
#        assert isinstance(database, (Database, int))
#        instance_id = base.getid(instance)
#        db_id = base.getid(database)
#        url = "/instances/%s/databases/%s" % (instance_id, db_id)
#        return self._get(url, "database")