# Copyright 2021 The gRPC Authors
#
# 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 logging
from typing import Tuple

from absl import flags
from absl.testing import absltest

from framework import xds_url_map_testcase
from framework.test_app import client_app

# Type aliases
HostRule = xds_url_map_testcase.HostRule
PathMatcher = xds_url_map_testcase.PathMatcher
GcpResourceManager = xds_url_map_testcase.GcpResourceManager
DumpedXdsConfig = xds_url_map_testcase.DumpedXdsConfig
RpcTypeUnaryCall = xds_url_map_testcase.RpcTypeUnaryCall
RpcTypeEmptyCall = xds_url_map_testcase.RpcTypeEmptyCall
XdsTestClient = client_app.XdsTestClient

logger = logging.getLogger(__name__)
flags.adopt_module_key_flags(xds_url_map_testcase)

_NUM_RPCS = 150


class TestFullPathMatchEmptyCall(xds_url_map_testcase.XdsUrlMapTestCase):

    @staticmethod
    def url_map_change(
            host_rule: HostRule,
            path_matcher: PathMatcher) -> Tuple[HostRule, PathMatcher]:
        path_matcher["routeRules"] = [{
            'priority': 0,
            # FullPath EmptyCall -> alternate_backend_service.
            'matchRules': [{
                'fullPathMatch': '/grpc.testing.TestService/EmptyCall'
            }],
            'service': GcpResourceManager().alternative_backend_service()
        }]
        return host_rule, path_matcher

    def xds_config_validate(self, xds_config: DumpedXdsConfig):
        self.assertNumEndpoints(xds_config, 2)
        self.assertEqual(
            xds_config.rds['virtualHosts'][0]['routes'][0]['match']['path'],
            "/grpc.testing.TestService/EmptyCall")

    def rpc_distribution_validate(self, test_client: XdsTestClient):
        rpc_distribution = self.configure_and_send(test_client,
                                                   rpc_types=[RpcTypeEmptyCall],
                                                   num_rpcs=_NUM_RPCS)
        self.assertEqual(
            _NUM_RPCS,
            rpc_distribution.empty_call_alternative_service_rpc_count)


class TestFullPathMatchUnaryCall(xds_url_map_testcase.XdsUrlMapTestCase):

    @staticmethod
    def url_map_change(
            host_rule: HostRule,
            path_matcher: PathMatcher) -> Tuple[HostRule, PathMatcher]:
        path_matcher["routeRules"] = [{
            'priority': 0,
            # FullPath EmptyCall -> alternate_backend_service.
            'matchRules': [{
                'fullPathMatch': '/grpc.testing.TestService/UnaryCall'
            }],
            'service': GcpResourceManager().alternative_backend_service()
        }]
        return host_rule, path_matcher

    def xds_config_validate(self, xds_config: DumpedXdsConfig):
        self.assertNumEndpoints(xds_config, 2)
        self.assertEqual(
            xds_config.rds['virtualHosts'][0]['routes'][0]['match']['path'],
            "/grpc.testing.TestService/UnaryCall")

    def rpc_distribution_validate(self, test_client: XdsTestClient):
        rpc_distribution = self.configure_and_send(test_client,
                                                   rpc_types=[RpcTypeUnaryCall],
                                                   num_rpcs=_NUM_RPCS)
        self.assertEqual(
            _NUM_RPCS,
            rpc_distribution.unary_call_alternative_service_rpc_count)


class TestTwoRoutesAndPrefixMatch(xds_url_map_testcase.XdsUrlMapTestCase):
    """This test case is similar to the one above (but with route services
    swapped). This test has two routes (full_path and the default) to match
    EmptyCall, and both routes set alternative_backend_service as the action.
    This forces the client to handle duplicate Clusters in the RDS response."""

    @staticmethod
    def url_map_change(
            host_rule: HostRule,
            path_matcher: PathMatcher) -> Tuple[HostRule, PathMatcher]:
        path_matcher["routeRules"] = [
            {
                'priority': 0,
                # Prefix UnaryCall -> default_backend_service.
                'matchRules': [{
                    'prefixMatch': '/grpc.testing.TestService/Unary'
                }],
                'service': GcpResourceManager().default_backend_service()
            },
            {
                'priority': 1,
                # FullPath EmptyCall -> alternate_backend_service.
                'matchRules': [{
                    'fullPathMatch': '/grpc.testing.TestService/EmptyCall'
                }],
                'service': GcpResourceManager().alternative_backend_service()
            }
        ]
        return host_rule, path_matcher

    def xds_config_validate(self, xds_config: DumpedXdsConfig):
        self.assertNumEndpoints(xds_config, 2)
        self.assertEqual(
            xds_config.rds['virtualHosts'][0]['routes'][0]['match']['prefix'],
            "/grpc.testing.TestService/Unary")
        self.assertEqual(
            xds_config.rds['virtualHosts'][0]['routes'][1]['match']['path'],
            "/grpc.testing.TestService/EmptyCall")

    def rpc_distribution_validate(self, test_client: XdsTestClient):
        rpc_distribution = self.configure_and_send(
            test_client,
            rpc_types=[RpcTypeUnaryCall, RpcTypeEmptyCall],
            num_rpcs=_NUM_RPCS)
        self.assertEqual(0, rpc_distribution.num_failures)
        self.assertEqual(
            0, rpc_distribution.unary_call_alternative_service_rpc_count)
        self.assertEqual(0,
                         rpc_distribution.empty_call_default_service_rpc_count)


class TestRegexMatch(xds_url_map_testcase.XdsUrlMapTestCase):

    @staticmethod
    def url_map_change(
            host_rule: HostRule,
            path_matcher: PathMatcher) -> Tuple[HostRule, PathMatcher]:
        path_matcher["routeRules"] = [{
            'priority': 0,
            # Regex UnaryCall -> alternate_backend_service.
            'matchRules': [{
                'regexMatch':
                    '^\/.*\/UnaryCall$'  # Unary methods with any services.
            }],
            'service': GcpResourceManager().alternative_backend_service()
        }]
        return host_rule, path_matcher

    def xds_config_validate(self, xds_config: DumpedXdsConfig):
        self.assertNumEndpoints(xds_config, 2)
        self.assertEqual(
            xds_config.rds['virtualHosts'][0]['routes'][0]['match']['safeRegex']
            ['regex'], '^\/.*\/UnaryCall$')

    def rpc_distribution_validate(self, test_client: XdsTestClient):
        rpc_distribution = self.configure_and_send(test_client,
                                                   rpc_types=[RpcTypeUnaryCall],
                                                   num_rpcs=_NUM_RPCS)
        self.assertEqual(
            _NUM_RPCS,
            rpc_distribution.unary_call_alternative_service_rpc_count)


class TestCaseInsensitiveMatch(xds_url_map_testcase.XdsUrlMapTestCase):

    @staticmethod
    def url_map_change(
            host_rule: HostRule,
            path_matcher: PathMatcher) -> Tuple[HostRule, PathMatcher]:
        path_matcher["routeRules"] = [{
            'priority': 0,
            # ignoreCase EmptyCall -> alternate_backend_service.
            'matchRules': [{
                # Case insensitive matching.
                'fullPathMatch': '/gRpC.tEsTinG.tEstseRvice/empTycaLl',
                'ignoreCase': True,
            }],
            'service': GcpResourceManager().alternative_backend_service()
        }]
        return host_rule, path_matcher

    def xds_config_validate(self, xds_config: DumpedXdsConfig):
        self.assertNumEndpoints(xds_config, 2)
        self.assertEqual(
            xds_config.rds['virtualHosts'][0]['routes'][0]['match']['path'],
            '/gRpC.tEsTinG.tEstseRvice/empTycaLl')
        self.assertEqual(
            xds_config.rds['virtualHosts'][0]['routes'][0]['match']
            ['caseSensitive'], False)

    def rpc_distribution_validate(self, test_client: XdsTestClient):
        rpc_distribution = self.configure_and_send(test_client,
                                                   rpc_types=[RpcTypeEmptyCall],
                                                   num_rpcs=_NUM_RPCS)
        self.assertEqual(
            _NUM_RPCS,
            rpc_distribution.empty_call_alternative_service_rpc_count)


if __name__ == '__main__':
    absltest.main()
