#    Copyright 2016 Red Hat, Inc.
#
#    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.

import re

from oslo_versionedobjects import fields
import six


class PCIAddress(fields.FieldType):

    _REGEX = re.compile(r'^[0-9a-f]{4}:[0-9a-f]{2}:[0-1][0-9a-f].[0-7]$')

    @staticmethod
    def coerce(obj, attr, value):
        if isinstance(value, six.string_types):
            newvalue = value.lower()
            if PCIAddress._REGEX.match(newvalue):
                return newvalue
        raise ValueError("Malformed PCI address %s", value)


class PCIAddressField(fields.AutoTypedField):
    AUTO_TYPE = PCIAddress()


class VIFDirectMode(fields.Enum):
    VEPA = 'vepa'
    PASSTHROUGH = 'passthrough'
    BRIDGE = 'bridge'

    ALL = (VEPA, PASSTHROUGH, BRIDGE)

    def __init__(self):
        super(VIFDirectMode, self).__init__(
            valid_values=VIFDirectMode.ALL)


class VIFDirectModeField(fields.BaseEnumField):
    AUTO_TYPE = VIFDirectMode()


class VIFVHostUserMode(fields.Enum):
    CLIENT = "client"
    SERVER = "server"

    ALL = (CLIENT, SERVER)

    def __init__(self):
        super(VIFVHostUserMode, self).__init__(
            valid_values=VIFVHostUserMode.ALL)


class VIFVHostUserModeField(fields.BaseEnumField):
    AUTO_TYPE = VIFVHostUserMode()


class ListOfIPAddressField(fields.AutoTypedField):
    AUTO_TYPE = fields.List(fields.IPAddress())


class VIFVIFHostDeviceDevType(fields.Enum):
    ETHERNET = 'ethernet'
    GENERIC = 'generic'

    ALL = (ETHERNET, GENERIC)

    def __init__(self):
        super(VIFVIFHostDeviceDevType, self).__init__(
            valid_values=VIFVIFHostDeviceDevType.ALL)


class VIFVIFHostDeviceDevTypeField(fields.BaseEnumField):
    AUTO_TYPE = VIFVIFHostDeviceDevType()