# Copyright 2013 Big Switch Networks, 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.
#
# Adapted from neutron.tests.unit.test_l3_plugin
# @author: Sumit Naiksatam, sumitnaiksatam@gmail.com
#

import contextlib
import copy

import mock
from oslo.config import cfg
from six import moves
from webob import exc

from neutron.common import test_lib
from neutron import context
from neutron.extensions import l3
from neutron import manager
from neutron.openstack.common import uuidutils
from neutron.plugins.bigswitch.extensions import routerrule
from neutron.tests.unit.bigswitch import fake_server
from neutron.tests.unit.bigswitch import test_base
from neutron.tests.unit import test_api_v2
from neutron.tests.unit import test_extension_extradhcpopts as test_extradhcp
from neutron.tests.unit import test_l3_plugin


HTTPCON = 'neutron.plugins.bigswitch.servermanager.httplib.HTTPConnection'
_uuid = uuidutils.generate_uuid


class RouterRulesTestExtensionManager(object):

    def get_resources(self):
        l3.RESOURCE_ATTRIBUTE_MAP['routers'].update(
            routerrule.EXTENDED_ATTRIBUTES_2_0['routers'])
        return l3.L3.get_resources()

    def get_actions(self):
        return []

    def get_request_extensions(self):
        return []


class DHCPOptsTestCase(test_base.BigSwitchTestBase,
                       test_extradhcp.TestExtraDhcpOpt):

    def setUp(self, plugin=None):
        self.setup_patches()
        self.setup_config_files()
        super(test_extradhcp.ExtraDhcpOptDBTestCase,
              self).setUp(plugin=self._plugin_name)
        self.startHttpPatch()


class RouterDBTestBase(test_base.BigSwitchTestBase,
                       test_l3_plugin.L3BaseForIntTests,
                       test_l3_plugin.L3NatTestCaseMixin):

    def setUp(self):
        self.setup_patches()
        self.setup_config_files()
        ext_mgr = RouterRulesTestExtensionManager()
        super(RouterDBTestBase, self).setUp(plugin=self._plugin_name,
                                            ext_mgr=ext_mgr)
        cfg.CONF.set_default('allow_overlapping_ips', False)
        self.plugin_obj = manager.NeutronManager.get_plugin()
        self.startHttpPatch()

    def tearDown(self):
        super(RouterDBTestBase, self).tearDown()
        del test_lib.test_config['config_files']


class RouterDBTestCase(RouterDBTestBase,
                       test_l3_plugin.L3NatDBIntTestCase):

    def test_router_remove_router_interface_wrong_subnet_returns_400(self):
        with self.router() as r:
            with self.subnet() as s:
                with self.subnet(cidr='10.0.10.0/24') as s1:
                    with self.port(subnet=s1, no_delete=True) as p:
                        self._router_interface_action('add',
                                                      r['router']['id'],
                                                      None,
                                                      p['port']['id'])
                        self._router_interface_action('remove',
                                                      r['router']['id'],
                                                      s['subnet']['id'],
                                                      p['port']['id'],
                                                      exc.HTTPBadRequest.code)
                        #remove properly to clean-up
                        self._router_interface_action('remove',
                                                      r['router']['id'],
                                                      None,
                                                      p['port']['id'])

    def test_router_remove_router_interface_wrong_port_returns_404(self):
        with self.router() as r:
            with self.subnet() as s:
                with self.port(subnet=s, no_delete=True) as p:
                    self._router_interface_action('add',
                                                  r['router']['id'],
                                                  None,
                                                  p['port']['id'])
                    # create another port for testing failure case
                    res = self._create_port('json', p['port']['network_id'])
                    p2 = self.deserialize('json', res)
                    self._router_interface_action('remove',
                                                  r['router']['id'],
                                                  None,
                                                  p2['port']['id'],
                                                  exc.HTTPNotFound.code)
                    # remove correct interface to cleanup
                    self._router_interface_action('remove',
                                                  r['router']['id'],
                                                  None,
                                                  p['port']['id'])
                    # remove extra port created
                    self._delete('ports', p2['port']['id'])

    def test_multi_tenant_flip_alllocation(self):
        tenant1_id = _uuid()
        tenant2_id = _uuid()
        with contextlib.nested(
            self.network(tenant_id=tenant1_id),
            self.network(tenant_id=tenant2_id)) as (n1, n2):
            with contextlib.nested(
                self.subnet(network=n1, cidr='11.0.0.0/24'),
                self.subnet(network=n2, cidr='12.0.0.0/24'),
                self.subnet(cidr='13.0.0.0/24')) as (s1, s2, psub):
                with contextlib.nested(
                    self.router(tenant_id=tenant1_id),
                    self.router(tenant_id=tenant2_id),
                    self.port(subnet=s1, tenant_id=tenant1_id),
                    self.port(subnet=s2, tenant_id=tenant2_id)) as (r1, r2,
                                                                    p1, p2):
                    self._set_net_external(psub['subnet']['network_id'])
                    s1id = p1['port']['fixed_ips'][0]['subnet_id']
                    s2id = p2['port']['fixed_ips'][0]['subnet_id']
                    s1 = {'subnet': {'id': s1id}}
                    s2 = {'subnet': {'id': s2id}}
                    self._add_external_gateway_to_router(
                        r1['router']['id'],
                        psub['subnet']['network_id'])
                    self._add_external_gateway_to_router(
                        r2['router']['id'],
                        psub['subnet']['network_id'])
                    self._router_interface_action(
                        'add', r1['router']['id'],
                        s1['subnet']['id'], None)
                    self._router_interface_action(
                        'add', r2['router']['id'],
                        s2['subnet']['id'], None)
                    fl1 = self._make_floatingip_for_tenant_port(
                        net_id=psub['subnet']['network_id'],
                        port_id=p1['port']['id'],
                        tenant_id=tenant1_id)
                    self.httpPatch.stop()
                    multiFloatPatch = mock.patch(
                        HTTPCON,
                        new=fake_server.VerifyMultiTenantFloatingIP)
                    multiFloatPatch.start()
                    fl2 = self._make_floatingip_for_tenant_port(
                        net_id=psub['subnet']['network_id'],
                        port_id=p2['port']['id'],
                        tenant_id=tenant2_id)
                    multiFloatPatch.stop()
                    self.httpPatch.start()
                    self._delete('floatingips', fl1['floatingip']['id'])
                    self._delete('floatingips', fl2['floatingip']['id'])
                    self._router_interface_action(
                        'remove', r1['router']['id'],
                        s1['subnet']['id'], None)
                    self._router_interface_action(
                        'remove', r2['router']['id'],
                        s2['subnet']['id'], None)

    def _make_floatingip_for_tenant_port(self, net_id, port_id, tenant_id):
        data = {'floatingip': {'floating_network_id': net_id,
                               'tenant_id': tenant_id,
                               'port_id': port_id}}
        floatingip_req = self.new_create_request('floatingips', data, self.fmt)
        res = floatingip_req.get_response(self.ext_api)
        return self.deserialize(self.fmt, res)

    def test_floatingip_with_invalid_create_port(self):
        self._test_floatingip_with_invalid_create_port(
            'neutron.plugins.bigswitch.plugin.NeutronRestProxyV2')

    def test_create_floatingip_no_ext_gateway_return_404(self):
        with self.subnet(cidr='10.0.10.0/24') as public_sub:
            self._set_net_external(public_sub['subnet']['network_id'])
            with self.port() as private_port:
                with self.router():
                    res = self._create_floatingip(
                        'json',
                        public_sub['subnet']['network_id'],
                        port_id=private_port['port']['id'])
                    self.assertEqual(res.status_int, exc.HTTPNotFound.code)

    def test_router_update_gateway(self):
        with self.router() as r:
            with self.subnet() as s1:
                with self.subnet(cidr='10.0.10.0/24') as s2:
                    self._set_net_external(s1['subnet']['network_id'])
                    self._add_external_gateway_to_router(
                        r['router']['id'],
                        s1['subnet']['network_id'])
                    body = self._show('routers', r['router']['id'])
                    net_id = (body['router']
                              ['external_gateway_info']['network_id'])
                    self.assertEqual(net_id, s1['subnet']['network_id'])
                    self._set_net_external(s2['subnet']['network_id'])
                    self._add_external_gateway_to_router(
                        r['router']['id'],
                        s2['subnet']['network_id'])
                    body = self._show('routers', r['router']['id'])
                    net_id = (body['router']
                              ['external_gateway_info']['network_id'])
                    self.assertEqual(net_id, s2['subnet']['network_id'])
                    self._remove_external_gateway_from_router(
                        r['router']['id'],
                        s2['subnet']['network_id'])

    def test_router_add_interface_overlapped_cidr(self):
        self.skipTest("Plugin does not support")

    def test_router_add_interface_overlapped_cidr_returns_400(self):
        self.skipTest("Plugin does not support")

    def test_list_nets_external(self):
        self.skipTest("Plugin does not support")

    def test_router_update_gateway_with_existed_floatingip(self):
        with self.subnet(cidr='10.0.10.0/24') as subnet:
            self._set_net_external(subnet['subnet']['network_id'])
            with self.floatingip_with_assoc() as fip:
                self._add_external_gateway_to_router(
                    fip['floatingip']['router_id'],
                    subnet['subnet']['network_id'],
                    expected_code=exc.HTTPConflict.code)

    def test_router_remove_interface_wrong_subnet_returns_400(self):
        with self.router() as r:
            with self.subnet(cidr='10.0.10.0/24') as s:
                with self.port(no_delete=True) as p:
                    self._router_interface_action('add',
                                                  r['router']['id'],
                                                  None,
                                                  p['port']['id'])
                    self._router_interface_action('remove',
                                                  r['router']['id'],
                                                  s['subnet']['id'],
                                                  p['port']['id'],
                                                  exc.HTTPBadRequest.code)
                    #remove properly to clean-up
                    self._router_interface_action('remove',
                                                  r['router']['id'],
                                                  None,
                                                  p['port']['id'])

    def test_router_remove_interface_wrong_port_returns_404(self):
        with self.router() as r:
            with self.subnet(cidr='10.0.10.0/24'):
                with self.port(no_delete=True) as p:
                    self._router_interface_action('add',
                                                  r['router']['id'],
                                                  None,
                                                  p['port']['id'])
                    # create another port for testing failure case
                    res = self._create_port('json', p['port']['network_id'])
                    p2 = self.deserialize('json', res)
                    self._router_interface_action('remove',
                                                  r['router']['id'],
                                                  None,
                                                  p2['port']['id'],
                                                  exc.HTTPNotFound.code)
                    # remove correct interface to cleanup
                    self._router_interface_action('remove',
                                                  r['router']['id'],
                                                  None,
                                                  p['port']['id'])
                    # remove extra port created
                    self._delete('ports', p2['port']['id'])

    def test_send_data(self):
        fmt = 'json'
        plugin_obj = manager.NeutronManager.get_plugin()

        with self.router() as r:
            r_id = r['router']['id']

            with self.subnet(cidr='10.0.10.0/24') as s:
                s_id = s['subnet']['id']

                with self.router() as r1:
                    r1_id = r1['router']['id']
                    body = self._router_interface_action('add', r_id, s_id,
                                                         None)
                    self.assertIn('port_id', body)
                    r_port_id = body['port_id']
                    body = self._show('ports', r_port_id)
                    self.assertEqual(body['port']['device_id'], r_id)

                    with self.subnet(cidr='10.0.20.0/24') as s1:
                        s1_id = s1['subnet']['id']
                        body = self._router_interface_action('add', r1_id,
                                                             s1_id, None)
                        self.assertIn('port_id', body)
                        r1_port_id = body['port_id']
                        body = self._show('ports', r1_port_id)
                        self.assertEqual(body['port']['device_id'], r1_id)

                        with self.subnet(cidr='11.0.0.0/24') as public_sub:
                            public_net_id = public_sub['subnet']['network_id']
                            self._set_net_external(public_net_id)

                            with self.port() as prv_port:
                                prv_fixed_ip = prv_port['port']['fixed_ips'][0]
                                priv_sub_id = prv_fixed_ip['subnet_id']
                                self._add_external_gateway_to_router(
                                    r_id, public_net_id)
                                self._router_interface_action('add', r_id,
                                                              priv_sub_id,
                                                              None)

                                priv_port_id = prv_port['port']['id']
                                res = self._create_floatingip(
                                    fmt, public_net_id,
                                    port_id=priv_port_id)
                                self.assertEqual(res.status_int,
                                                 exc.HTTPCreated.code)
                                floatingip = self.deserialize(fmt, res)

                                result = plugin_obj._send_all_data()
                                self.assertEqual(result[0], 200)

                                self._delete('floatingips',
                                             floatingip['floatingip']['id'])
                                self._remove_external_gateway_from_router(
                                    r_id, public_net_id)
                                self._router_interface_action('remove', r_id,
                                                              priv_sub_id,
                                                              None)
                        self._router_interface_action('remove', r_id, s_id,
                                                      None)
                        self._show('ports', r_port_id,
                                   expected_code=exc.HTTPNotFound.code)
                        self._router_interface_action('remove', r1_id, s1_id,
                                                      None)
                        self._show('ports', r1_port_id,
                                   expected_code=exc.HTTPNotFound.code)

    def test_router_rules_update(self):
        with self.router() as r:
            r_id = r['router']['id']
            router_rules = [{'destination': '1.2.3.4/32',
                             'source': '4.3.2.1/32',
                             'action': 'permit',
                             'nexthops': ['4.4.4.4', '4.4.4.5']}]
            body = self._update('routers', r_id,
                                {'router': {'router_rules': router_rules}})

            body = self._show('routers', r['router']['id'])
            self.assertIn('router_rules', body['router'])
            rules = body['router']['router_rules']
            self.assertEqual(_strip_rule_ids(rules), router_rules)
            # Try after adding another rule
            router_rules.append({'source': 'external',
                                 'destination': '8.8.8.8/32',
                                 'action': 'permit', 'nexthops': []})
            body = self._update('routers', r['router']['id'],
                                {'router': {'router_rules': router_rules}})

            body = self._show('routers', r['router']['id'])
            self.assertIn('router_rules', body['router'])
            rules = body['router']['router_rules']
            self.assertEqual(_strip_rule_ids(rules), router_rules)

    def test_router_rules_separation(self):
        with self.router() as r1:
            with self.router() as r2:
                r1_id = r1['router']['id']
                r2_id = r2['router']['id']
                router1_rules = [{'destination': '5.6.7.8/32',
                                 'source': '8.7.6.5/32',
                                 'action': 'permit',
                                 'nexthops': ['8.8.8.8', '9.9.9.9']}]
                router2_rules = [{'destination': '1.2.3.4/32',
                                 'source': '4.3.2.1/32',
                                 'action': 'permit',
                                 'nexthops': ['4.4.4.4', '4.4.4.5']}]
                body1 = self._update('routers', r1_id,
                                     {'router':
                                         {'router_rules': router1_rules}})
                body2 = self._update('routers', r2_id,
                                     {'router':
                                         {'router_rules': router2_rules}})

                body1 = self._show('routers', r1_id)
                body2 = self._show('routers', r2_id)
                rules1 = body1['router']['router_rules']
                rules2 = body2['router']['router_rules']
                self.assertEqual(_strip_rule_ids(rules1), router1_rules)
                self.assertEqual(_strip_rule_ids(rules2), router2_rules)

    def test_router_rules_validation(self):
        with self.router() as r:
            r_id = r['router']['id']
            good_rules = [{'destination': '1.2.3.4/32',
                           'source': '4.3.2.1/32',
                           'action': 'permit',
                           'nexthops': ['4.4.4.4', '4.4.4.5']}]

            body = self._update('routers', r_id,
                                {'router': {'router_rules': good_rules}})
            body = self._show('routers', r_id)
            self.assertIn('router_rules', body['router'])
            self.assertEqual(good_rules,
                             _strip_rule_ids(body['router']['router_rules']))

            # Missing nexthops should be populated with an empty list
            light_rules = copy.deepcopy(good_rules)
            del light_rules[0]['nexthops']
            body = self._update('routers', r_id,
                                {'router': {'router_rules': light_rules}})
            body = self._show('routers', r_id)
            self.assertIn('router_rules', body['router'])
            light_rules[0]['nexthops'] = []
            self.assertEqual(light_rules,
                             _strip_rule_ids(body['router']['router_rules']))
            # bad CIDR
            bad_rules = copy.deepcopy(good_rules)
            bad_rules[0]['destination'] = '1.1.1.1'
            body = self._update('routers', r_id,
                                {'router': {'router_rules': bad_rules}},
                                expected_code=exc.HTTPBadRequest.code)
            # bad next hop
            bad_rules = copy.deepcopy(good_rules)
            bad_rules[0]['nexthops'] = ['1.1.1.1', 'f2']
            body = self._update('routers', r_id,
                                {'router': {'router_rules': bad_rules}},
                                expected_code=exc.HTTPBadRequest.code)
            # bad action
            bad_rules = copy.deepcopy(good_rules)
            bad_rules[0]['action'] = 'dance'
            body = self._update('routers', r_id,
                                {'router': {'router_rules': bad_rules}},
                                expected_code=exc.HTTPBadRequest.code)
            # duplicate rule with opposite action
            bad_rules = copy.deepcopy(good_rules)
            bad_rules.append(copy.deepcopy(bad_rules[0]))
            bad_rules.append(copy.deepcopy(bad_rules[0]))
            bad_rules[1]['source'] = 'any'
            bad_rules[2]['action'] = 'deny'
            body = self._update('routers', r_id,
                                {'router': {'router_rules': bad_rules}},
                                expected_code=exc.HTTPBadRequest.code)
            # duplicate nexthop
            bad_rules = copy.deepcopy(good_rules)
            bad_rules[0]['nexthops'] = ['1.1.1.1', '1.1.1.1']
            body = self._update('routers', r_id,
                                {'router': {'router_rules': bad_rules}},
                                expected_code=exc.HTTPBadRequest.code)
            # make sure light rules persisted during bad updates
            body = self._show('routers', r_id)
            self.assertIn('router_rules', body['router'])
            self.assertEqual(light_rules,
                             _strip_rule_ids(body['router']['router_rules']))

    def test_router_rules_config_change(self):
        cfg.CONF.set_override('tenant_default_router_rule',
                              ['*:any:any:deny',
                               '*:8.8.8.8/32:any:permit:1.2.3.4'],
                              'ROUTER')
        with self.router() as r:
            body = self._show('routers', r['router']['id'])
            expected_rules = [{'source': 'any', 'destination': 'any',
                               'nexthops': [], 'action': 'deny'},
                              {'source': '8.8.8.8/32', 'destination': 'any',
                               'nexthops': ['1.2.3.4'], 'action': 'permit'}]
            self.assertEqual(expected_rules,
                             _strip_rule_ids(body['router']['router_rules']))

    def test_rule_exhaustion(self):
        cfg.CONF.set_override('max_router_rules', 10, 'ROUTER')
        with self.router() as r:
            rules = []
            for i in moves.xrange(1, 12):
                rule = {'source': 'any', 'nexthops': [],
                        'destination': '1.1.1.' + str(i) + '/32',
                        'action': 'permit'}
                rules.append(rule)
            self._update('routers', r['router']['id'],
                         {'router': {'router_rules': rules}},
                         expected_code=exc.HTTPBadRequest.code)

    def test_rollback_on_router_create(self):
        tid = test_api_v2._uuid()
        self.httpPatch.stop()
        with mock.patch(HTTPCON, new=fake_server.HTTPConnectionMock500):
            self._create_router('json', tid)
        self.assertTrue(len(self._get_routers(tid)) == 0)

    def test_rollback_on_router_update(self):
        with self.router() as r:
            data = {'router': {'name': 'aNewName'}}
            self.httpPatch.stop()
            with mock.patch(HTTPCON, new=fake_server.HTTPConnectionMock500):
                self.new_update_request(
                    'routers', data, r['router']['id']).get_response(self.api)
            self.httpPatch.start()
            updatedr = self._get_routers(r['router']['tenant_id'])[0]
            # name should have stayed the same due to failure
            self.assertEqual(r['router']['name'], updatedr['name'])

    def test_rollback_on_router_delete(self):
        with self.router() as r:
            self.httpPatch.stop()
            with mock.patch(HTTPCON, new=fake_server.HTTPConnectionMock500):
                self._delete('routers', r['router']['id'],
                             expected_code=exc.HTTPInternalServerError.code)
            self.httpPatch.start()
            self.assertEqual(r['router']['id'],
                             self._get_routers(r['router']['tenant_id']
                                               )[0]['id'])

    def _get_routers(self, tenant_id):
        ctx = context.Context('', tenant_id)
        return self.plugin_obj.get_routers(ctx)


def _strip_rule_ids(rules):
    cleaned = []
    for rule in rules:
        del rule['id']
        cleaned.append(rule)
    return cleaned
