# Copyright 2017 VMware, 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.

from neutron_lib import exceptions as n_exc
from oslo_log import helpers as log_helpers
from oslo_log import log as logging

from vmware_nsx._i18n import _
from vmware_nsx.db import db as nsx_db
from vmware_nsx.services.lbaas import base_mgr
from vmware_nsxlib.v3 import exceptions as nsxlib_exc

LOG = logging.getLogger(__name__)


class EdgeL7PolicyManager(base_mgr.Nsxv3LoadbalancerBaseManager):
    @log_helpers.log_method_call
    def __init__(self):
        super(EdgeL7PolicyManager, self).__init__()

    @log_helpers.log_method_call
    def _l7policy_action(self, context, policy, action, delete=False):
        try:
            self.lbv2_driver.l7policy.successful_completion(
                context, policy, delete=delete)
        except Exception as e:
            self.lbv2_driver.l7policy.failed_completion(context, policy)
            msg = (_('Failed to %(action)s l7policy %(err)s') %
                   {'action': action, 'err': e})
            resource = 'lbaas-l7policy-%s' % action
            raise n_exc.BadRequest(resource=resource, msg=msg)

    @log_helpers.log_method_call
    def create(self, context, policy):
        self._l7policy_action(context, policy, 'create')

    @log_helpers.log_method_call
    def update(self, context, old_policy, new_policy):
        self._l7policy_action(context, new_policy, 'update')

    @log_helpers.log_method_call
    def delete(self, context, policy):
        lb_id = policy.listener.loadbalancer_id
        vs_client = self.core_plugin.nsxlib.load_balancer.virtual_server
        rule_client = self.core_plugin.nsxlib.load_balancer.rule
        for rule in policy.rules:
            binding = nsx_db.get_nsx_lbaas_l7rule_binding(
                context.session, lb_id, policy.id, rule.id)
            if binding:
                vs_id = binding['lb_vs_id']
                rule_id = binding['lb_rule_id']
                try:
                    # Update virtual server to remove lb rule
                    vs_client.remove_rule(vs_id, rule_id)
                    rule_client.delete(rule_id)
                except nsxlib_exc.ResourceNotFound:
                    LOG.warning('LB rule %(rule)s is not found on NSX',
                                {'rule': rule_id})
                except nsxlib_exc.ManagerError:
                    self.lbv2_driver.l7policy.failed_completion(
                        context, policy)
                    msg = (_('Failed to delete lb rule: %(rule)s') %
                           {'rule': rule.id})
                    raise n_exc.BadRequest(resource='lbaas-l7rule-delete',
                                           msg=msg)
                nsx_db.delete_nsx_lbaas_l7rule_binding(
                    context.session, lb_id, policy.id, rule.id)
        self.lbv2_driver.l7policy.successful_completion(
            context, policy, delete=True)