# 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 openstack.database.v1 import database as _database
from openstack.database.v1 import flavor as _flavor
from openstack.database.v1 import instance as _instance
from openstack.database.v1 import user as _user
from openstack import proxy


class Proxy(proxy.Proxy):

    def create_database(self, instance, **attrs):
        """Create a new database from attributes

        :param instance: This can be either the ID of an instance
            or a :class:`~openstack.database.v1.instance.Instance`
        :param dict attrs: Keyword arguments which will be used to create
            a :class:`~openstack.database.v1.database.Database`,
            comprised of the properties on the Database class.

        :returns: The results of server creation
        :rtype: :class:`~openstack.database.v1.database.Database`
        """
        instance = self._get_resource(_instance.Instance, instance)
        return self._create(_database.Database, instance_id=instance.id,
                            **attrs)

    def delete_database(self, database, instance=None, ignore_missing=True):
        """Delete a database

        :param database: The value can be either the ID of a database or a
            :class:`~openstack.database.v1.database.Database` instance.
        :param instance: This parameter needs to be specified when
            an ID is given as `database`.
            It can be either the ID of an instance
            or a :class:`~openstack.database.v1.instance.Instance`
        :param bool ignore_missing: When set to ``False``
            :class:`~openstack.exceptions.ResourceNotFound` will be
            raised when the database does not exist.
            When set to ``True``, no exception will be set when
            attempting to delete a nonexistent database.

        :returns: ``None``
        """
        instance_id = self._get_uri_attribute(database, instance,
                                              "instance_id")
        self._delete(_database.Database, database, instance_id=instance_id,
                     ignore_missing=ignore_missing)

    def find_database(self, name_or_id, instance, ignore_missing=True):
        """Find a single database

        :param name_or_id: The name or ID of a database.
        :param instance: This can be either the ID of an instance
            or a :class:`~openstack.database.v1.instance.Instance`
        :param bool ignore_missing: When set to ``False``
            :class:`~openstack.exceptions.ResourceNotFound` will be
            raised when the resource does not exist.
            When set to ``True``, None will be returned when
            attempting to find a nonexistent resource.
        :returns: One :class:`~openstack.database.v1.database.Database` or None
        """
        instance = self._get_resource(_instance.Instance, instance)
        return self._find(_database.Database, name_or_id,
                          instance_id=instance.id,
                          ignore_missing=ignore_missing)

    def databases(self, instance, **query):
        """Return a generator of databases

        :param instance: This can be either the ID of an instance
            or a :class:`~openstack.database.v1.instance.Instance`
            instance that the interface belongs to.
        :param kwargs query: Optional query parameters to be sent to limit
            the resources being returned.

        :returns: A generator of database objects
        :rtype: :class:`~openstack.database.v1.database.Database`
        """
        instance = self._get_resource(_instance.Instance, instance)
        return self._list(_database.Database, instance_id=instance.id, **query)

    def get_database(self, database, instance=None):
        """Get a single database

        :param instance: This parameter needs to be specified when
            an ID is given as `database`.
            It can be either the ID of an instance
            or a :class:`~openstack.database.v1.instance.Instance`
        :param database: The value can be the ID of a database or a
            :class:`~openstack.database.v1.database.Database`
            instance.

        :returns: One :class:`~openstack.database.v1.database.Database`
        :raises: :class:`~openstack.exceptions.ResourceNotFound`
            when no resource can be found.
        """
        return self._get(_database.Database, database)

    def find_flavor(self, name_or_id, ignore_missing=True):
        """Find a single flavor

        :param name_or_id: The name or ID of a flavor.
        :param bool ignore_missing: When set to ``False``
            :class:`~openstack.exceptions.ResourceNotFound` will be
            raised when the resource does not exist.
            When set to ``True``, None will be returned when
            attempting to find a nonexistent resource.
        :returns: One :class:`~openstack.database.v1.flavor.Flavor` or None
        """
        return self._find(_flavor.Flavor, name_or_id,
                          ignore_missing=ignore_missing)

    def get_flavor(self, flavor):
        """Get a single flavor

        :param flavor: The value can be the ID of a flavor or a
            :class:`~openstack.database.v1.flavor.Flavor` instance.

        :returns: One :class:`~openstack.database.v1.flavor.Flavor`
        :raises: :class:`~openstack.exceptions.ResourceNotFound`
            when no resource can be found.
        """
        return self._get(_flavor.Flavor, flavor)

    def flavors(self, **query):
        """Return a generator of flavors

        :param kwargs query: Optional query parameters to be sent to limit
            the resources being returned.

        :returns: A generator of flavor objects
        :rtype: :class:`~openstack.database.v1.flavor.Flavor`
        """
        return self._list(_flavor.Flavor, **query)

    def create_instance(self, **attrs):
        """Create a new instance from attributes

        :param dict attrs: Keyword arguments which will be used to create
            a :class:`~openstack.database.v1.instance.Instance`,
            comprised of the properties on the Instance class.

        :returns: The results of server creation
        :rtype: :class:`~openstack.database.v1.instance.Instance`
        """
        return self._create(_instance.Instance, **attrs)

    def delete_instance(self, instance, ignore_missing=True):
        """Delete an instance

        :param instance: The value can be either the ID of an instance or a
            :class:`~openstack.database.v1.instance.Instance` instance.
        :param bool ignore_missing: When set to ``False``
            :class:`~openstack.exceptions.ResourceNotFound` will be
            raised when the instance does not exist.
            When set to ``True``, no exception will be set when
            attempting to delete a nonexistent instance.

        :returns: ``None``
        """
        self._delete(_instance.Instance, instance,
                     ignore_missing=ignore_missing)

    def find_instance(self, name_or_id, ignore_missing=True):
        """Find a single instance

        :param name_or_id: The name or ID of a instance.
        :param bool ignore_missing: When set to ``False``
            :class:`~openstack.exceptions.ResourceNotFound` will be
            raised when the resource does not exist.
            When set to ``True``, None will be returned when
            attempting to find a nonexistent resource.
        :returns: One :class:`~openstack.database.v1.instance.Instance` or None
        """
        return self._find(_instance.Instance, name_or_id,
                          ignore_missing=ignore_missing)

    def get_instance(self, instance):
        """Get a single instance

        :param instance: The value can be the ID of an instance or a
            :class:`~openstack.database.v1.instance.Instance`
            instance.

        :returns: One :class:`~openstack.database.v1.instance.Instance`
        :raises: :class:`~openstack.exceptions.ResourceNotFound`
            when no resource can be found.
        """
        return self._get(_instance.Instance, instance)

    def instances(self, **query):
        """Return a generator of instances

        :param kwargs query: Optional query parameters to be sent to limit
            the resources being returned.

        :returns: A generator of instance objects
        :rtype: :class:`~openstack.database.v1.instance.Instance`
        """
        return self._list(_instance.Instance, **query)

    def update_instance(self, instance, **attrs):
        """Update a instance

        :param instance: Either the id of a instance or a
            :class:`~openstack.database.v1.instance.Instance`
            instance.
        :attrs kwargs: The attributes to update on the instance represented
            by ``value``.

        :returns: The updated instance
        :rtype: :class:`~openstack.database.v1.instance.Instance`
        """
        return self._update(_instance.Instance, instance, **attrs)

    def create_user(self, instance, **attrs):
        """Create a new user from attributes

        :param instance: This can be either the ID of an instance
            or a :class:`~openstack.database.v1.instance.Instance`
        :param dict attrs: Keyword arguments which will be used to create
            a :class:`~openstack.database.v1.user.User`,
            comprised of the properties on the User class.

        :returns: The results of server creation
        :rtype: :class:`~openstack.database.v1.user.User`
        """
        instance = self._get_resource(_instance.Instance, instance)
        return self._create(_user.User, instance_id=instance.id, **attrs)

    def delete_user(self, user, instance=None, ignore_missing=True):
        """Delete a user

        :param user: The value can be either the ID of a user or a
            :class:`~openstack.database.v1.user.User` instance.
        :param instance: This parameter needs to be specified when
            an ID is given as `user`.
            It can be either the ID of an instance
            or a :class:`~openstack.database.v1.instance.Instance`
        :param bool ignore_missing: When set to ``False``
            :class:`~openstack.exceptions.ResourceNotFound` will be
            raised when the user does not exist.
            When set to ``True``, no exception will be set when
            attempting to delete a nonexistent user.

        :returns: ``None``
        """
        instance = self._get_resource(_instance.Instance, instance)
        self._delete(_user.User, user, ignore_missing=ignore_missing,
                     instance_id=instance.id)

    def find_user(self, name_or_id, instance, ignore_missing=True):
        """Find a single user

        :param name_or_id: The name or ID of a user.
        :param instance: This can be either the ID of an instance
            or a :class:`~openstack.database.v1.instance.Instance`
        :param bool ignore_missing: When set to ``False``
            :class:`~openstack.exceptions.ResourceNotFound` will be
            raised when the resource does not exist.
            When set to ``True``, None will be returned when
            attempting to find a nonexistent resource.
        :returns: One :class:`~openstack.database.v1.user.User` or None
        """
        instance = self._get_resource(_instance.Instance, instance)
        return self._find(_user.User, name_or_id, instance_id=instance.id,
                          ignore_missing=ignore_missing)

    def users(self, instance, **query):
        """Return a generator of users

        :param instance: This can be either the ID of an instance
            or a :class:`~openstack.database.v1.instance.Instance`
        :param kwargs query: Optional query parameters to be sent to limit
            the resources being returned.

        :returns: A generator of user objects
        :rtype: :class:`~openstack.database.v1.user.User`
        """
        instance = self._get_resource(_instance.Instance, instance)
        return self._list(_user.User, instance_id=instance.id, **query)

    def get_user(self, user, instance=None):
        """Get a single user

        :param user: The value can be the ID of a user or a
            :class:`~openstack.database.v1.user.User` instance.
        :param instance: This parameter needs to be specified when
            an ID is given as `database`.
            It can be either the ID of an instance
            or a :class:`~openstack.database.v1.instance.Instance`

        :returns: One :class:`~openstack.database.v1.user.User`
        :raises: :class:`~openstack.exceptions.ResourceNotFound`
            when no resource can be found.
        """
        instance = self._get_resource(_instance.Instance, instance)
        return self._get(_user.User, user)