# Copyright 2011 VMware, Inc, 2014 A10 Networks
# 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.

"""
Octavia base exception handling.
"""

from oslo.utils import excutils
from webob import exc

from octavia.i18n import _LE


class OctaviaException(Exception):
    """Base Octavia Exception.

    To correctly use this class, inherit from it and define
    a 'message' property. That message will get printf'd
    with the keyword arguments provided to the constructor.
    """
    message = _("An unknown exception occurred.")

    def __init__(self, **kwargs):
        try:
            super(OctaviaException, self).__init__(self.message % kwargs)
            self.msg = self.message % kwargs
        except Exception:
            with excutils.save_and_reraise_exception() as ctxt:
                if not self.use_fatal_exceptions():
                    ctxt.reraise = False
                    # at least get the core message out if something happened
                    super(OctaviaException, self).__init__(self.message)

    def __unicode__(self):
        return unicode(self.msg)

    def use_fatal_exceptions(self):
        return False


# NOTE(blogan) Using webob exceptions here because WSME exceptions a very
# limited at this point and they do not work well in _lookup methods in the
# controllers
class APIException(exc.HTTPClientError):
    msg = "Something unknown went wrong"
    code = 500

    def __init__(self, **kwargs):
        self.msg = self.msg % kwargs
        super(APIException, self).__init__(detail=self.msg)


class NotFound(APIException):
    msg = _('%(resource)s %(id)s not found.')
    code = 404


class NotAuthorized(APIException):
    msg = _("Not authorized.")
    code = 401


class InvalidOption(APIException):
    msg = _("%(value)s is not a valid option for %(option)s")
    code = 400


class MissingArguments(OctaviaException):
    message = _("Missing arguments.")


class CertificateStorageException(OctaviaException):
    message = _('Could not store certificate: %(msg)s')


class CertificateGenerationException(OctaviaException):
    message = _('Could not sign the certificate request: %(msg)s')


class DuplicateListenerEntry(APIException):
    msg = _("Another Listener on this Load Balancer "
            "is already using protocol_port %(port)d")
    code = 409


class DuplicateMemberEntry(APIException):
    msg = _("Another member on this pool is already using ip %(ip_address)s "
            "on protocol_port %(port)d")
    code = 409


class DuplicateHealthMonitor(APIException):
    msg = _("This pool already has a health monitor")
    code = 409


class DuplicatePoolEntry(APIException):
    msg = _("This listener already has a default pool")
    code = 409


class ImmutableObject(APIException):
    msg = _("%(resource)s %(id)s is immutable and cannot be updated.")
    code = 409


class ComputeBuildException(OctaviaException):
    message = _LE('Failed to build nova instance.')


class ComputeDeleteException(OctaviaException):
    message = _LE('Failed to delete nova instance.')


class ComputeGetException(OctaviaException):
    message = _LE('Failed to retrieve nova instance.')


class ComputeStatusException(OctaviaException):
    message = _LE('Failed to retrieve nova instance status.')