# Copyright 2011 Denali Systems, Inc.
# 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.

"""
Volume interface (1.1 extension).
"""

import urllib
from cinderclient import base


class Volume(base.Resource):
    """
    A volume is an extra block level storage to the OpenStack instances.
    """
    def __repr__(self):
        return "<Volume: %s>" % self.id

    def delete(self):
        """
        Delete this volume.
        """
        self.manager.delete(self)

    def update(self, **kwargs):
        """
        Update the display_name or display_description for this volume.
        """
        self.manager.update(self, **kwargs)

    def attach(self, instance_uuid, mountpoint):
        """
        Set attachment metadata.

        :param instance_uuid: uuid of the attaching instance.
        :param mountpoint: mountpoint on the attaching instance.
        """
        return self.manager.attach(self, instance_uuid, mountpoint)

    def detach(self):
        """
        Clear attachment metadata.
        """
        return self.manager.detach(self)

    def reserve(self, volume):
        """
        Reserve this volume.
        """
        return self.manager.reserve(self)

    def unreserve(self, volume):
        """
        Unreserve this volume.
        """
        return self.manager.unreserve(self)

    def begin_detaching(self, volume):
        """
        Begin detaching volume.
        """
        return self.manager.begin_detaching(self)

    def roll_detaching(self, volume):
        """
        Roll detaching volume.
        """
        return self.manager.roll_detaching(self)

    def initialize_connection(self, volume, connector):
        """
        Initialize a volume connection.

        :param connector: connector dict from nova.
        """
        return self.manager.initialize_connection(self, connector)

    def terminate_connection(self, volume, connector):
        """
        Terminate a volume connection.

        :param connector: connector dict from nova.
        """
        return self.manager.terminate_connection(self, connector)


class VolumeManager(base.ManagerWithFind):
    """
    Manage :class:`Volume` resources.
    """
    resource_class = Volume

    def create(self, size, snapshot_id=None,
               display_name=None, display_description=None,
               volume_type=None, user_id=None,
               project_id=None, availability_zone=None,
               metadata=None, imageRef=None):
        """
        Create a volume.

        :param size: Size of volume in GB
        :param snapshot_id: ID of the snapshot
        :param display_name: Name of the volume
        :param display_description: Description of the volume
        :param volume_type: Type of volume
        :rtype: :class:`Volume`
        :param user_id: User id derived from context
        :param project_id: Project id derived from context
        :param availability_zone: Availability Zone to use
        :param metadata: Optional metadata to set on volume creation
        :param imageRef: reference to an image stored in glance
        """

        if metadata is None:
            volume_metadata = {}
        else:
            volume_metadata = metadata

        body = {'volume': {'size': size,
                           'snapshot_id': snapshot_id,
                           'display_name': display_name,
                           'display_description': display_description,
                           'volume_type': volume_type,
                           'user_id': user_id,
                           'project_id': project_id,
                           'availability_zone': availability_zone,
                           'status': "creating",
                           'attach_status': "detached",
                           'metadata': volume_metadata,
                           'imageRef': imageRef,
                           }}
        return self._create('/volumes', body, 'volume')

    def get(self, volume_id):
        """
        Get a volume.

        :param volume_id: The ID of the volume to delete.
        :rtype: :class:`Volume`
        """
        return self._get("/volumes/%s" % volume_id, "volume")

    def list(self, detailed=True, search_opts=None):
        """
        Get a list of all volumes.

        :rtype: list of :class:`Volume`
        """
        if search_opts is None:
            search_opts = {}

        qparams = {}

        for opt, val in search_opts.iteritems():
            if val:
                qparams[opt] = val

        query_string = "?%s" % urllib.urlencode(qparams) if qparams else ""

        detail = ""
        if detailed:
            detail = "/detail"

        return self._list("/volumes%s%s" % (detail, query_string),
                          "volumes")

    def delete(self, volume):
        """
        Delete a volume.

        :param volume: The :class:`Volume` to delete.
        """
        self._delete("/volumes/%s" % base.getid(volume))

    def update(self, volume, **kwargs):
        """
        Update the display_name or display_description for a volume.

        :param volume: The :class:`Volume` to delete.
        """
        if not kwargs:
            return

        body = {"volume": kwargs}

        self._update("/volumes/%s" % base.getid(volume), body)

    def create_server_volume(self, server_id, volume_id, device):
        """
        Attach a volume identified by the volume ID to the given server ID

        :param server_id: The ID of the server
        :param volume_id: The ID of the volume to attach.
        :param device: The device name
        :rtype: :class:`Volume`
        """
        body = {'volumeAttachment': {'volumeId': volume_id,
                                     'device': device}}
        return self._create("/servers/%s/os-volume_attachments" % server_id,
                            body, "volumeAttachment")

    def get_server_volume(self, server_id, attachment_id):
        """
        Get the volume identified by the attachment ID, that is attached to
        the given server ID

        :param server_id: The ID of the server
        :param attachment_id: The ID of the attachment
        :rtype: :class:`Volume`
        """
        return self._get("/servers/%s/os-volume_attachments/%s" % (server_id,
                         attachment_id,), "volumeAttachment")

    def get_server_volumes(self, server_id):
        """
        Get a list of all the attached volumes for the given server ID

        :param server_id: The ID of the server
        :rtype: list of :class:`Volume`
        """
        return self._list("/servers/%s/os-volume_attachments" % server_id,
                          "volumeAttachments")

    def delete_server_volume(self, server_id, attachment_id):
        """
        Detach a volume identified by the attachment ID from the given server

        :param server_id: The ID of the server
        :param attachment_id: The ID of the attachment
        """
        self._delete("/servers/%s/os-volume_attachments/%s" %
                     (server_id, attachment_id,))

    def _action(self, action, volume, info=None, **kwargs):
        """
        Perform a volume "action."
        """
        body = {action: info}
        self.run_hooks('modify_body_for_action', body, **kwargs)
        url = '/volumes/%s/action' % base.getid(volume)
        return self.api.client.post(url, body=body)

    def attach(self, volume, instance_uuid, mountpoint):
        """
        Set attachment metadata.

        :param volume: The :class:`Volume` (or its ID)
                       you would like to attach.
        :param instance_uuid: uuid of the attaching instance.
        :param mountpoint: mountpoint on the attaching instance.
        """
        return self._action('os-attach',
                            volume,
                            {'instance_uuid': instance_uuid,
                             'mountpoint': mountpoint})

    def detach(self, volume):
        """
        Clear attachment metadata.

        :param volume: The :class:`Volume` (or its ID)
                       you would like to detach.
        """
        return self._action('os-detach', volume)

    def reserve(self, volume):
        """
        Reserve this volume.

        :param volume: The :class:`Volume` (or its ID)
                       you would like to reserve.
        """
        return self._action('os-reserve', volume)

    def unreserve(self, volume):
        """
        Unreserve this volume.

        :param volume: The :class:`Volume` (or its ID)
                       you would like to unreserve.
        """
        return self._action('os-unreserve', volume)

    def begin_detaching(self, volume):
        """
        Begin detaching this volume.

        :param volume: The :class:`Volume` (or its ID)
                       you would like to detach.
        """
        return self._action('os-begin_detaching', volume)

    def roll_detaching(self, volume):
        """
        Roll detaching this volume.

        :param volume: The :class:`Volume` (or its ID)
                       you would like to roll detaching.
        """
        return self._action('os-roll_detaching', volume)

    def initialize_connection(self, volume, connector):
        """
        Initialize a volume connection.

        :param volume: The :class:`Volume` (or its ID).
        :param connector: connector dict from nova.
        """
        return self._action('os-initialize_connection', volume,
                            {'connector': connector})[1]['connection_info']

    def terminate_connection(self, volume, connector):
        """
        Terminate a volume connection.

        :param volume: The :class:`Volume` (or its ID).
        :param connector: connector dict from nova.
        """
        self._action('os-terminate_connection', volume,
                     {'connector': connector})