# Copyright (c) 2011 Zadara Storage Inc.
# Copyright (c) 2011 OpenStack Foundation
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# Copyright (c) 2010 Citrix Systems, Inc.
# Copyright 2011 Ken Pepple
#
#    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.

"""Built-in volume type properties."""


from oslo.config import cfg

from cinder import context
from cinder import db
from cinder import exception
from cinder.openstack.common.db import exception as db_exc
from cinder.openstack.common import log as logging


CONF = cfg.CONF
LOG = logging.getLogger(__name__)


def create(context, name, extra_specs={}):
    """Creates volume types."""
    try:
        type_ref = db.volume_type_create(context,
                                         dict(name=name,
                                              extra_specs=extra_specs))
    except db_exc.DBError as e:
        LOG.exception(_('DB error: %s') % e)
        raise exception.VolumeTypeCreateFailed(name=name,
                                               extra_specs=extra_specs)
    return type_ref


def destroy(context, id):
    """Marks volume types as deleted."""
    if id is None:
        msg = _("id cannot be None")
        raise exception.InvalidVolumeType(reason=msg)
    else:
        db.volume_type_destroy(context, id)


def get_all_types(context, inactive=0, search_opts={}):
    """Get all non-deleted volume_types.

    Pass true as argument if you want deleted volume types returned also.

    """
    vol_types = db.volume_type_get_all(context, inactive)

    if search_opts:
        LOG.debug(_("Searching by: %s") % search_opts)

        def _check_extra_specs_match(vol_type, searchdict):
            for k, v in searchdict.iteritems():
                if (k not in vol_type['extra_specs'].keys()
                        or vol_type['extra_specs'][k] != v):
                    return False
            return True

        # search_option to filter_name mapping.
        filter_mapping = {'extra_specs': _check_extra_specs_match}

        result = {}
        for type_name, type_args in vol_types.iteritems():
            # go over all filters in the list
            for opt, values in search_opts.iteritems():
                try:
                    filter_func = filter_mapping[opt]
                except KeyError:
                    # no such filter - ignore it, go to next filter
                    continue
                else:
                    if filter_func(type_args, values):
                        result[type_name] = type_args
                        break
        vol_types = result
    return vol_types


def get_volume_type(ctxt, id):
    """Retrieves single volume type by id."""
    if id is None:
        msg = _("id cannot be None")
        raise exception.InvalidVolumeType(reason=msg)

    if ctxt is None:
        ctxt = context.get_admin_context()

    return db.volume_type_get(ctxt, id)


def get_volume_type_by_name(context, name):
    """Retrieves single volume type by name."""
    if name is None:
        msg = _("name cannot be None")
        raise exception.InvalidVolumeType(reason=msg)

    return db.volume_type_get_by_name(context, name)


def get_default_volume_type():
    """Get the default volume type."""
    name = CONF.default_volume_type
    vol_type = {}

    if name is not None:
        ctxt = context.get_admin_context()
        try:
            vol_type = get_volume_type_by_name(ctxt, name)
        except exception.VolumeTypeNotFoundByName as e:
            # Couldn't find volume type with the name in default_volume_type
            # flag, record this issue and move on
            #TODO(zhiteng) consider add notification to warn admin
            LOG.exception(_('Default volume type is not found, '
                            'please check default_volume_type config: %s'), e)

    return vol_type


def get_volume_type_extra_specs(volume_type_id, key=False):
    volume_type = get_volume_type(context.get_admin_context(),
                                  volume_type_id)
    extra_specs = volume_type['extra_specs']
    if key:
        if extra_specs.get(key):
            return extra_specs.get(key)
        else:
            return False
    else:
        return extra_specs


def is_encrypted(context, volume_type_id):
    if volume_type_id is None:
        return False

    encryption = db.volume_type_encryption_get(context, volume_type_id)
    return encryption is not None


def get_volume_type_encryption(context, volume_type_id):
    if volume_type_id is None:
        return None

    encryption = db.volume_type_encryption_get(context, volume_type_id)
    return encryption


def get_volume_type_qos_specs(volume_type_id):
    ctxt = context.get_admin_context()
    res = db.volume_type_qos_specs_get(ctxt,
                                       volume_type_id)
    return res


def volume_types_diff(context, vol_type_id1, vol_type_id2):