# Copyright (c) 2011 X.commerce, a business unit of eBay Inc.
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# Copyright 2011 Piston Cloud Computing, 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.
"""
SQLAlchemy models for Manila data.
"""

from oslo_config import cfg
from oslo_db.sqlalchemy import models
from oslo_log import log
from sqlalchemy import Column, Integer, String, schema
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import orm
from sqlalchemy import ForeignKey, DateTime, Boolean, Enum

from manila.common import constants

CONF = cfg.CONF
BASE = declarative_base()

LOG = log.getLogger(__name__)


class ManilaBase(models.ModelBase,
                 models.TimestampMixin,
                 models.SoftDeleteMixin):
    """Base class for Manila Models."""
    __table_args__ = {'mysql_engine': 'InnoDB'}
    metadata = None

    def to_dict(self):
        model_dict = {}
        for k, v in self.items():
            if not issubclass(type(v), ManilaBase):
                model_dict[k] = v
        return model_dict

    def soft_delete(self, session, update_status=False,
                    status_field_name='status'):
        """Mark this object as deleted."""
        if update_status:
            setattr(self, status_field_name, constants.STATUS_DELETED)

        return super(ManilaBase, self).soft_delete(session)


class Service(BASE, ManilaBase):
    """Represents a running service on a host."""

    __tablename__ = 'services'
    id = Column(Integer, primary_key=True)
    host = Column(String(255))  # , ForeignKey('hosts.id'))
    binary = Column(String(255))
    topic = Column(String(255))
    report_count = Column(Integer, nullable=False, default=0)
    disabled = Column(Boolean, default=False)
    availability_zone_id = Column(String(36),
                                  ForeignKey('availability_zones.id'),
                                  nullable=True)

    availability_zone = orm.relationship(
        "AvailabilityZone",
        lazy='immediate',
        primaryjoin=(
            'and_('
            'Service.availability_zone_id == '
            'AvailabilityZone.id, '
            'AvailabilityZone.deleted == \'False\')'
        )
    )


class ManilaNode(BASE, ManilaBase):
    """Represents a running manila service on a host."""

    __tablename__ = 'manila_nodes'
    id = Column(Integer, primary_key=True)
    service_id = Column(Integer, ForeignKey('services.id'), nullable=True)


class Quota(BASE, ManilaBase):
    """Represents a single quota override for a project.

    If there is no row for a given project id and resource, then the
    default for the quota class is used.  If there is no row for a
    given quota class and resource, then the default for the
    deployment is used. If the row is present but the hard limit is
    Null, then the resource is unlimited.
    """

    __tablename__ = 'quotas'
    id = Column(Integer, primary_key=True)

    project_id = Column(String(255), index=True)

    resource = Column(String(255))
    hard_limit = Column(Integer, nullable=True)


class ProjectUserQuota(BASE, ManilaBase):
    """Represents a single quota override for a user with in a project."""

    __tablename__ = 'project_user_quotas'
    id = Column(Integer, primary_key=True, nullable=False)

    project_id = Column(String(255), nullable=False)
    user_id = Column(String(255), nullable=False)

    resource = Column(String(255), nullable=False)
    hard_limit = Column(Integer)


class QuotaClass(BASE, ManilaBase):
    """Represents a single quota override for a quota class.

    If there is no row for a given quota class and resource, then the
    default for the deployment is used.  If the row is present but the
    hard limit is Null, then the resource is unlimited.
    """

    __tablename__ = 'quota_classes'
    id = Column(Integer, primary_key=True)

    class_name = Column(String(255), index=True)

    resource = Column(String(255))
    hard_limit = Column(Integer, nullable=True)


class QuotaUsage(BASE, ManilaBase):
    """Represents the current usage for a given resource."""

    __tablename__ = 'quota_usages'
    id = Column(Integer, primary_key=True)

    project_id = Column(String(255), index=True)
    user_id = Column(String(255))
    resource = Column(String(255))

    in_use = Column(Integer)
    reserved = Column(Integer)

    @property
    def total(self):
        return self.in_use + self.reserved

    until_refresh = Column(Integer, nullable=True)


class Reservation(BASE, ManilaBase):
    """Represents a resource reservation for quotas."""

    __tablename__ = 'reservations'
    id = Column(Integer, primary_key=True)
    uuid = Column(String(36), nullable=False)

    usage_id = Column(Integer, ForeignKey('quota_usages.id'), nullable=False)

    project_id = Column(String(255), index=True)
    user_id = Column(String(255))
    resource = Column(String(255))

    delta = Column(Integer)
    expire = Column(DateTime, nullable=False)

#    usage = orm.relationship(
#        "QuotaUsage",
#        foreign_keys=usage_id,
#        primaryjoin='and_(Reservation.usage_id == QuotaUsage.id,'
#                         'QuotaUsage.deleted == 0)')


class Share(BASE, ManilaBase):
    """Represents an NFS and CIFS shares."""
    __tablename__ = 'shares'
    _extra_keys = ['name', 'export_location', 'export_locations', 'status',
                   'host', 'share_server_id', 'share_network_id',
                   'availability_zone', 'access_rules_status']

    @property
    def name(self):
        return CONF.share_name_template % self.id

    @property
    def export_location(self):
        if len(self.instances) > 0:
            return self.instance.export_location

    @property
    def is_busy(self):
        # Make sure share is not busy, i.e., not part of a migration
        if self.task_state in constants.BUSY_TASK_STATES:
            return True
        return False

    @property
    def export_locations(self):
        # TODO(gouthamr): Return AZ specific export locations for replicated
        # shares.
        # NOTE(gouthamr): For a replicated share, export locations of the
        # 'active' instances are chosen, if 'available'.
        all_export_locations = []
        select_instances = list(filter(
            lambda x: x['replica_state'] == constants.REPLICA_STATE_ACTIVE,
            self.instances)) or self.instances

        for instance in select_instances:
            if instance['status'] == constants.STATUS_AVAILABLE:
                for export_location in instance.export_locations:
                    all_export_locations.append(export_location['path'])

        return all_export_locations

    def __getattr__(self, item):
        deprecated_properties = ('host', 'share_server_id', 'share_network_id',
                                 'availability_zone')
        proxified_properties = ('status',) + deprecated_properties

        if item in deprecated_properties:
            msg = ("Property '%s' is deprecated. Please use appropriate "
                   "property from share instance." % item)
            LOG.warning(msg)

        if item in proxified_properties:
            return getattr(self.instance, item, None)

        raise AttributeError(item)

    @property
    def share_server_id(self):
        return self.__getattr__('share_server_id')

    @property
    def has_replicas(self):
        if len(self.instances) > 1:
            # NOTE(gouthamr): The 'primary' instance of a replicated share
            # has a 'replica_state' set to 'active'. Only the secondary replica
            # instances need to be regarded as true 'replicas' by users.
            replicas = (list(filter(lambda x: x['replica_state'] is not None,
                                    self.instances)))
            return len(replicas) > 1
        return False

    @property
    def instance(self):
        # NOTE(gouthamr): The order of preference: status 'replication_change',
        # followed  by 'available' and 'error'. If replicated share and
        # not undergoing a 'replication_change', only 'active' instances are
        # preferred.
        result = None
        if len(self.instances) > 0:
            order = (constants.STATUS_REPLICATION_CHANGE,
                     constants.STATUS_MIGRATING, constants.STATUS_AVAILABLE,
                     constants.STATUS_ERROR)
            other_statuses = (
                [x['status'] for x in self.instances if
                 x['status'] not in order and
                 x['status'] not in constants.TRANSITIONAL_STATUSES]
            )
            order = (order + tuple(other_statuses) +
                     constants.TRANSITIONAL_STATUSES)
            sorted_instances = sorted(
                self.instances, key=lambda x: order.index(x['status']))

            select_instances = sorted_instances
            if (select_instances[0]['status'] !=
                    constants.STATUS_REPLICATION_CHANGE):
                select_instances = (
                    list(filter(lambda x: x['replica_state'] ==
                                constants.REPLICA_STATE_ACTIVE,
                                sorted_instances)) or sorted_instances
                )
            result = select_instances[0]
        return result

    @property
    def access_rules_status(self):
        return get_access_rules_status(self.instances)

    id = Column(String(36), primary_key=True)
    deleted = Column(String(36), default='False')
    user_id = Column(String(255))
    project_id = Column(String(255))
    size = Column(Integer)

    display_name = Column(String(255))
    display_description = Column(String(255))
    snapshot_id = Column(String(36))
    snapshot_support = Column(Boolean, default=True)
    replication_type = Column(String(255), nullable=True)
    share_proto = Column(String(255))
    share_type_id = Column(String(36), ForeignKey('share_types.id'),
                           nullable=True)
    is_public = Column(Boolean, default=False)
    consistency_group_id = Column(String(36),
                                  ForeignKey('consistency_groups.id'),
                                  nullable=True)

    source_cgsnapshot_member_id = Column(String(36), nullable=True)
    task_state = Column(String(255))
    instances = orm.relationship(
        "ShareInstance",
        lazy='immediate',
        primaryjoin=(
            'and_('
            'Share.id == ShareInstance.share_id, '
            'ShareInstance.deleted == "False")'
        ),
        viewonly=True,
        join_depth=2,
    )
    share_type = orm.relationship(
        "ShareTypes",
        lazy=True,
        foreign_keys=share_type_id,
        primaryjoin='and_('
                    'Share.share_type_id == ShareTypes.id, '
                    'ShareTypes.deleted == "False")')


class ShareInstance(BASE, ManilaBase):
    __tablename__ = 'share_instances'

    _extra_keys = ['name', 'export_location', 'availability_zone',
                   'replica_state']
    _proxified_properties = ('user_id', 'project_id', 'size',
                             'display_name', 'display_description',
                             'snapshot_id', 'share_proto', 'share_type_id',
                             'is_public', 'consistency_group_id',
                             'source_cgsnapshot_member_id')

    def set_share_data(self, share):
        for share_property in self._proxified_properties:
            setattr(self, share_property, share[share_property])

    @property
    def name(self):
        return CONF.share_name_template % self.id

    @property
    def export_location(self):
        if len(self.export_locations) > 0:
            return self.export_locations[0]['path']

    @property
    def availability_zone(self):
        if self._availability_zone:
            return self._availability_zone['name']

    id = Column(String(36), primary_key=True)
    share_id = Column(String(36), ForeignKey('shares.id'))
    deleted = Column(String(36), default='False')
    host = Column(String(255))
    status = Column(String(255))

    ACCESS_STATUS_PRIORITIES = {
        constants.STATUS_ACTIVE: 0,
        constants.STATUS_OUT_OF_SYNC: 1,
        constants.STATUS_ERROR: 2,
    }

    access_rules_status = Column(Enum(constants.STATUS_ACTIVE,
                                      constants.STATUS_OUT_OF_SYNC,
                                      constants.STATUS_ERROR),
                                 default=constants.STATUS_ACTIVE)

    scheduled_at = Column(DateTime)
    launched_at = Column(DateTime)
    terminated_at = Column(DateTime)
    replica_state = Column(String(255), nullable=True)

    availability_zone_id = Column(String(36),
                                  ForeignKey('availability_zones.id'),
                                  nullable=True)
    _availability_zone = orm.relationship(
        "AvailabilityZone",
        lazy='immediate',
        foreign_keys=availability_zone_id,
        primaryjoin=(
            'and_('
            'ShareInstance.availability_zone_id == '
            'AvailabilityZone.id, '
            'AvailabilityZone.deleted == \'False\')'
        )
    )

    export_locations = orm.relationship(
        "ShareInstanceExportLocations",
        lazy='immediate',
        primaryjoin=(
            'and_('
            'ShareInstance.id == '
            'ShareInstanceExportLocations.share_instance_id, '
            'ShareInstanceExportLocations.deleted == 0)'
        )
    )
    share_network_id = Column(String(36), ForeignKey('share_networks.id'),
                              nullable=True)
    share_server_id = Column(String(36), ForeignKey('share_servers.id'),
                             nullable=True)


class ShareInstanceExportLocations(BASE, ManilaBase):
    """Represents export locations of share instances."""
    __tablename__ = 'share_instance_export_locations'

    _extra_keys = ['el_metadata', ]

    @property
    def el_metadata(self):
        el_metadata = {}
        for meta in self._el_metadata_bare:  # pylint: disable=E1101
            el_metadata[meta['key']] = meta['value']
        return el_metadata

    id = Column(Integer, primary_key=True)
    uuid = Column(String(36), nullable=False, unique=True)
    share_instance_id = Column(
        String(36), ForeignKey('share_instances.id'), nullable=False)
    path = Column(String(2000))
    is_admin_only = Column(Boolean, default=False, nullable=False)


class ShareInstanceExportLocationsMetadata(BASE, ManilaBase):
    """Represents export location metadata of share instances."""
    __tablename__ = "share_instance_export_locations_metadata"

    _extra_keys = ['export_location_uuid', ]

    id = Column(Integer, primary_key=True)
    export_location_id = Column(
        Integer,
        ForeignKey("share_instance_export_locations.id"), nullable=False)
    key = Column(String(255), nullable=False)
    value = Column(String(1023), nullable=False)
    export_location = orm.relationship(
        ShareInstanceExportLocations,
        backref="_el_metadata_bare",
        foreign_keys=export_location_id,
        lazy='immediate',
        primaryjoin="and_("
                    "%(cls_name)s.export_location_id == "
                    "ShareInstanceExportLocations.id,"
                    "%(cls_name)s.deleted == 0)" % {
                        "cls_name": "ShareInstanceExportLocationsMetadata"})

    @property
    def export_location_uuid(self):
        return self.export_location.uuid  # pylint: disable=E1101


class ShareTypes(BASE, ManilaBase):
    """Represent possible share_types of volumes offered."""
    __tablename__ = "share_types"
    id = Column(String(36), primary_key=True)
    deleted = Column(String(36), default='False')
    name = Column(String(255))
    is_public = Column(Boolean, default=True)


class ShareTypeProjects(BASE, ManilaBase):
    """Represent projects associated share_types."""
    __tablename__ = "share_type_projects"
    __table_args__ = (schema.UniqueConstraint(
        "share_type_id", "project_id", "deleted",
        name="uniq_share_type_projects0share_type_id0project_id0deleted"),
    )
    id = Column(Integer, primary_key=True)
    share_type_id = Column(Integer, ForeignKey('share_types.id'),
                           nullable=False)
    project_id = Column(String(255))

    share_type = orm.relationship(
        ShareTypes,
        backref="projects",
        foreign_keys=share_type_id,
        primaryjoin='and_('
                    'ShareTypeProjects.share_type_id == ShareTypes.id,'
                    'ShareTypeProjects.deleted == 0)')


class ShareTypeExtraSpecs(BASE, ManilaBase):
    """Represents additional specs as key/value pairs for a share_type."""
    __tablename__ = 'share_type_extra_specs'
    id = Column(Integer, primary_key=True)
    key = Column("spec_key", String(255))
    value = Column("spec_value", String(255))
    share_type_id = Column(String(36), ForeignKey('share_types.id'),
                           nullable=False)
    share_type = orm.relationship(
        ShareTypes,
        backref="extra_specs",
        foreign_keys=share_type_id,
        primaryjoin='and_('
        'ShareTypeExtraSpecs.share_type_id == ShareTypes.id,'
        'ShareTypeExtraSpecs.deleted == 0)'
    )


class ShareMetadata(BASE, ManilaBase):
    """Represents a metadata key/value pair for a share."""
    __tablename__ = 'share_metadata'
    id = Column(Integer, primary_key=True)
    key = Column(String(255), nullable=False)
    value = Column(String(1023), nullable=False)
    share_id = Column(String(36), ForeignKey('shares.id'), nullable=False)
    share = orm.relationship(Share, backref="share_metadata",
                             foreign_keys=share_id,
                             primaryjoin='and_('
                             'ShareMetadata.share_id == Share.id,'
                             'ShareMetadata.deleted == 0)')


class ShareAccessMapping(BASE, ManilaBase):
    """Represents access to share."""
    __tablename__ = 'share_access_map'

    id = Column(String(36), primary_key=True)
    deleted = Column(String(36), default='False')
    share_id = Column(String(36), ForeignKey('shares.id'))
    access_type = Column(String(255))
    access_to = Column(String(255))

    access_level = Column(Enum(*constants.ACCESS_LEVELS),
                          default=constants.ACCESS_LEVEL_RW)

    instance_mappings = orm.relationship(
        "ShareInstanceAccessMapping",
        lazy='immediate',
        primaryjoin=(
            'and_('
            'ShareAccessMapping.id == '
            'ShareInstanceAccessMapping.access_id, '
            'ShareInstanceAccessMapping.deleted == "False")'
        )
    )

    @property
    def state(self):
        instances = [im.instance for im in self.instance_mappings]
        access_rules_status = get_access_rules_status(instances)

        if access_rules_status == constants.STATUS_OUT_OF_SYNC:
            return constants.STATUS_NEW
        else:
            return access_rules_status


class ShareInstanceAccessMapping(BASE, ManilaBase):
    """Represents access to individual share instances."""

    __tablename__ = 'share_instance_access_map'
    id = Column(String(36), primary_key=True)
    deleted = Column(String(36), default='False')
    share_instance_id = Column(String(36), ForeignKey('share_instances.id'))
    access_id = Column(String(36), ForeignKey('share_access_map.id'))

    instance = orm.relationship(
        "ShareInstance",
        lazy='immediate',
        primaryjoin=(
            'and_('
            'ShareInstanceAccessMapping.share_instance_id == '
            'ShareInstance.id, '
            'ShareInstanceAccessMapping.deleted == "False")'
        )
    )


class ShareSnapshot(BASE, ManilaBase):
    """Represents a snapshot of a share."""
    __tablename__ = 'share_snapshots'
    _extra_keys = ['name', 'share_name', 'status', 'progress',
                   'provider_location']

    @property
    def name(self):
        return CONF.share_snapshot_name_template % self.id

    @property
    def share_name(self):
        return CONF.share_name_template % self.share_id

    @property
    def status(self):
        if self.instance:
            return self.instance.status

    @property
    def progress(self):
        if self.instance:
            return self.instance.progress

    @property
    def provider_location(self):
        if self.instance:
            return self.instance.provider_location

    @property
    def instance(self):
        if len(self.instances) > 0:
            return self.instances[0]

    id = Column(String(36), primary_key=True)
    deleted = Column(String(36), default='False')
    user_id = Column(String(255))
    project_id = Column(String(255))
    share_id = Column(String(36))
    size = Column(Integer)
    display_name = Column(String(255))
    display_description = Column(String(255))
    share_size = Column(Integer)
    share_proto = Column(String(255))
    share = orm.relationship(Share, backref="snapshots",
                             foreign_keys=share_id,
                             primaryjoin='and_('
                             'ShareSnapshot.share_id == Share.id,'
                             'ShareSnapshot.deleted == "False")')

    instances = orm.relationship(
        "ShareSnapshotInstance",
        lazy='immediate',
        primaryjoin=(
            'and_('
            'ShareSnapshot.id == ShareSnapshotInstance.snapshot_id, '
            'ShareSnapshotInstance.deleted == "False")'
        ),
        viewonly=True,
        join_depth=2,
    )


class ShareSnapshotInstance(BASE, ManilaBase):
    """Represents a snapshot of a share."""
    __tablename__ = 'share_snapshot_instances'
    _extra_keys = ['name', 'share_id', 'share_name']

    @property
    def name(self):
        return CONF.share_snapshot_name_template % self.id

    @property
    def share_name(self):
        return CONF.share_name_template % self.share_instance_id

    @property
    def share_id(self):
        # NOTE(u_glide): This property required for compatibility
        # with share drivers
        return self.share_instance_id

    id = Column(String(36), primary_key=True)
    deleted = Column(String(36), default='False')
    snapshot_id = Column(
        String(36), ForeignKey('share_snapshots.id'), nullable=False)
    share_instance_id = Column(
        String(36), ForeignKey('share_instances.id'), nullable=False)
    status = Column(String(255))
    progress = Column(String(255))
    provider_location = Column(String(255))
    share_instance = orm.relationship(
        ShareInstance, backref="snapshot_instances",
        primaryjoin=(
            'and_('
            'ShareSnapshotInstance.share_instance_id == ShareInstance.id,'
            'ShareSnapshotInstance.deleted == "False")')
    )


class SecurityService(BASE, ManilaBase):
    """Security service information for manila shares."""

    __tablename__ = 'security_services'
    id = Column(String(36), primary_key=True)
    deleted = Column(String(36), default='False')
    project_id = Column(String(36), nullable=False)
    type = Column(String(32), nullable=False)
    dns_ip = Column(String(64), nullable=True)
    server = Column(String(255), nullable=True)
    domain = Column(String(255), nullable=True)
    user = Column(String(255), nullable=True)
    password = Column(String(255), nullable=True)
    name = Column(String(255), nullable=True)
    description = Column(String(255), nullable=True)


class ShareNetwork(BASE, ManilaBase):
    """Represents network data used by share."""
    __tablename__ = 'share_networks'
    id = Column(String(36), primary_key=True, nullable=False)
    deleted = Column(String(36), default='False')
    project_id = Column(String(36), nullable=False)
    user_id = Column(String(36), nullable=False)
    nova_net_id = Column(String(36), nullable=True)
    neutron_net_id = Column(String(36), nullable=True)
    neutron_subnet_id = Column(String(36), nullable=True)
    network_type = Column(String(32), nullable=True)
    segmentation_id = Column(Integer, nullable=True)
    cidr = Column(String(64), nullable=True)
    ip_version = Column(Integer, nullable=True)
    name = Column(String(255), nullable=True)
    description = Column(String(255), nullable=True)
    security_services = orm.relationship(
        "SecurityService",
        secondary="share_network_security_service_association",
        backref="share_networks",
        primaryjoin='and_('
                    'ShareNetwork.id == '
                    'ShareNetworkSecurityServiceAssociation.share_network_id,'
                    'ShareNetworkSecurityServiceAssociation.deleted == 0,'
                    'ShareNetwork.deleted == "False")',
        secondaryjoin='and_('
        'SecurityService.id == '
        'ShareNetworkSecurityServiceAssociation.security_service_id,'
        'SecurityService.deleted == "False")')
    share_instances = orm.relationship(
        "ShareInstance",
        backref='share_network',
        primaryjoin='and_('
                    'ShareNetwork.id == ShareInstance.share_network_id,'
                    'ShareInstance.deleted == "False")')
    share_servers = orm.relationship(
        "ShareServer", backref='share_network',
        primaryjoin='and_(ShareNetwork.id == ShareServer.share_network_id,'
                    'ShareServer.deleted == "False")')


class ShareServer(BASE, ManilaBase):
    """Represents share server used by share."""
    __tablename__ = 'share_servers'
    id = Column(String(36), primary_key=True, nullable=False)
    deleted = Column(String(36), default='False')
    share_network_id = Column(String(36), ForeignKey('share_networks.id'),
                              nullable=True)
    host = Column(String(255), nullable=False)
    status = Column(Enum(constants.STATUS_INACTIVE, constants.STATUS_ACTIVE,
                         constants.STATUS_ERROR, constants.STATUS_DELETING,
                         constants.STATUS_CREATING, constants.STATUS_DELETED),
                    default=constants.STATUS_INACTIVE)
    network_allocations = orm.relationship(
        "NetworkAllocation",
        primaryjoin='and_('
                    'ShareServer.id == NetworkAllocation.share_server_id,'
                    'NetworkAllocation.deleted == "False")')
    share_instances = orm.relationship(
        "ShareInstance",
        backref='share_server',
        primaryjoin='and_('
                    'ShareServer.id == ShareInstance.share_server_id,'
                    'ShareInstance.deleted == "False")')

    consistency_groups = orm.relationship(
        "ConsistencyGroup", backref='share_server', primaryjoin='and_('
        'ShareServer.id == ConsistencyGroup.share_server_id,'
        'ConsistencyGroup.deleted == "False")')

    _backend_details = orm.relationship(
        "ShareServerBackendDetails",
        lazy='immediate',
        viewonly=True,
        primaryjoin='and_('
                    'ShareServer.id == '
                    'ShareServerBackendDetails.share_server_id, '
                    'ShareServerBackendDetails.deleted == "False")')

    @property
    def backend_details(self):
        return {model['key']: model['value']
                for model in self._backend_details}

    _extra_keys = ['backend_details']


class ShareServerBackendDetails(BASE, ManilaBase):
    """Represents a metadata key/value pair for a share server."""
    __tablename__ = 'share_server_backend_details'
    deleted = Column(String(36), default='False')
    id = Column(Integer, primary_key=True)
    key = Column(String(255), nullable=False)
    value = Column(String(1023), nullable=False)
    share_server_id = Column(String(36), ForeignKey('share_servers.id'),
                             nullable=False)


class ShareNetworkSecurityServiceAssociation(BASE, ManilaBase):
    """Association table between compute_zones and compute_nodes tables."""

    __tablename__ = 'share_network_security_service_association'

    id = Column(Integer, primary_key=True)
    share_network_id = Column(String(36),
                              ForeignKey('share_networks.id'),
                              nullable=False)
    security_service_id = Column(String(36),
                                 ForeignKey('security_services.id'),
                                 nullable=False)


class NetworkAllocation(BASE, ManilaBase):
    """Represents network allocation data."""
    __tablename__ = 'network_allocations'
    id = Column(String(36), primary_key=True, nullable=False)
    deleted = Column(String(36), default='False')
    label = Column(String(255), nullable=True)
    ip_address = Column(String(64), nullable=True)
    ip_version = Column(Integer, nullable=True)
    cidr = Column(String(64), nullable=True)
    network_type = Column(String(32), nullable=True)
    segmentation_id = Column(Integer, nullable=True)
    mac_address = Column(String(32), nullable=True)
    share_server_id = Column(String(36), ForeignKey('share_servers.id'),
                             nullable=False)


class DriverPrivateData(BASE, ManilaBase):
    """Represents a private data as key-value pairs for a driver."""
    __tablename__ = 'drivers_private_data'
    host = Column(String(255), nullable=False, primary_key=True)
    entity_uuid = Column(String(36), nullable=False, primary_key=True)
    key = Column(String(255), nullable=False, primary_key=True)
    value = Column(String(1023), nullable=False)


class AvailabilityZone(BASE, ManilaBase):
    """Represents a private data as key-value pairs for a driver."""
    __tablename__ = 'availability_zones'
    id = Column(String(36), primary_key=True, nullable=False)
    deleted = Column(String(36), default='False')
    name = Column(String(255), nullable=False)


class ConsistencyGroup(BASE, ManilaBase):
    """Represents a consistency group."""
    __tablename__ = 'consistency_groups'
    id = Column(String(36), primary_key=True)

    user_id = Column(String(255), nullable=False)
    project_id = Column(String(255), nullable=False)
    deleted = Column(String(36), default='False')

    host = Column(String(255))
    name = Column(String(255))
    description = Column(String(255))
    status = Column(String(255))
    source_cgsnapshot_id = Column(String(36))
    share_network_id = Column(String(36), ForeignKey('share_networks.id'),
                              nullable=True)
    share_server_id = Column(String(36), ForeignKey('share_servers.id'),
                             nullable=True)


class CGSnapshot(BASE, ManilaBase):
    """Represents a cgsnapshot."""
    __tablename__ = 'cgsnapshots'
    id = Column(String(36), primary_key=True)

    consistency_group_id = Column(String(36),
                                  ForeignKey('consistency_groups.id'))
    user_id = Column(String(255), nullable=False)
    project_id = Column(String(255), nullable=False)
    deleted = Column(String(36), default='False')

    name = Column(String(255))
    description = Column(String(255))
    status = Column(String(255))

    consistency_group = orm.relationship(
        ConsistencyGroup,
        backref="cgsnapshots",
        foreign_keys=consistency_group_id,
        primaryjoin=('and_('
                     'CGSnapshot.consistency_group_id == ConsistencyGroup.id,'
                     'CGSnapshot.deleted == "False")')
    )


class ConsistencyGroupShareTypeMapping(BASE, ManilaBase):
    """Represents the share types in a consistency group."""
    __tablename__ = 'consistency_group_share_type_mappings'
    id = Column(String(36), primary_key=True)
    deleted = Column(String(36), default='False')
    consistency_group_id = Column(String(36),
                                  ForeignKey('consistency_groups.id'),
                                  nullable=False)
    share_type_id = Column(String(36),
                           ForeignKey('share_types.id'),
                           nullable=False)

    consistency_group = orm.relationship(
        ConsistencyGroup,
        backref="share_types",
        foreign_keys=consistency_group_id,
        primaryjoin=('and_('
                     'ConsistencyGroupShareTypeMapping.consistency_group_id '
                     '== ConsistencyGroup.id,'
                     'ConsistencyGroupShareTypeMapping.deleted == "False")')
    )


class CGSnapshotMember(BASE, ManilaBase):
    """Represents the share snapshots in a consistency group snapshot."""
    __tablename__ = 'cgsnapshot_members'
    id = Column(String(36), primary_key=True)
    cgsnapshot_id = Column(String(36), ForeignKey('cgsnapshots.id'))
    share_id = Column(String(36), ForeignKey('shares.id'))
    share_instance_id = Column(String(36), ForeignKey('share_instances.id'))
    size = Column(Integer)
    status = Column(String(255))
    share_proto = Column(String(255))
    share_type_id = Column(String(36), ForeignKey('share_types.id'),
                           nullable=True)
    user_id = Column(String(255))
    project_id = Column(String(255))
    deleted = Column(String(36), default='False')

    cgsnapshot = orm.relationship(
        CGSnapshot,
        backref="cgsnapshot_members",
        foreign_keys=cgsnapshot_id,
        primaryjoin='CGSnapshot.id == CGSnapshotMember.cgsnapshot_id')


def register_models():
    """Register Models and create metadata.

    Called from manila.db.sqlalchemy.__init__ as part of loading the driver,
    it will never need to be called explicitly elsewhere unless the
    connection is lost and needs to be reestablished.
    """
    from sqlalchemy import create_engine
    models = (Service,
              Share,
              ShareAccessMapping,
              ShareSnapshot
              )
    engine = create_engine(CONF.database.connection, echo=False)
    for model in models:
        model.metadata.create_all(engine)


def get_access_rules_status(instances):
    share_access_status = constants.STATUS_ACTIVE

    if len(instances) == 0:
        return share_access_status

    priorities = ShareInstance.ACCESS_STATUS_PRIORITIES

    for instance in instances:
        if instance['status'] != constants.STATUS_AVAILABLE:
            continue

        instance_access_status = instance['access_rules_status']

        if priorities.get(instance_access_status) > priorities.get(
                share_access_status):
            share_access_status = instance_access_status

        if share_access_status == constants.STATUS_ERROR:
            break

    return share_access_status
