# -*- coding: utf-8 -*-
# Copyright 2022 Google LLC
#
# 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 os
import mock

import grpc
from grpc.experimental import aio
import math
import pytest
from proto.marshal.rules.dates import DurationRule, TimestampRule


from google.api_core import client_options
from google.api_core import exceptions as core_exceptions
from google.api_core import gapic_v1
from google.api_core import grpc_helpers
from google.api_core import grpc_helpers_async
from google.api_core import path_template
from google.auth import credentials as ga_credentials
from google.auth.exceptions import MutualTLSChannelError
from google.cloud.dialogflowcx_v3beta1.services.changelogs import ChangelogsAsyncClient
from google.cloud.dialogflowcx_v3beta1.services.changelogs import ChangelogsClient
from google.cloud.dialogflowcx_v3beta1.services.changelogs import pagers
from google.cloud.dialogflowcx_v3beta1.services.changelogs import transports
from google.cloud.dialogflowcx_v3beta1.types import changelog
from google.oauth2 import service_account
from google.protobuf import timestamp_pb2  # type: ignore
import google.auth


def client_cert_source_callback():
    return b"cert bytes", b"key bytes"


# If default endpoint is localhost, then default mtls endpoint will be the same.
# This method modifies the default endpoint so the client can produce a different
# mtls endpoint for endpoint testing purposes.
def modify_default_endpoint(client):
    return (
        "foo.googleapis.com"
        if ("localhost" in client.DEFAULT_ENDPOINT)
        else client.DEFAULT_ENDPOINT
    )


def test__get_default_mtls_endpoint():
    api_endpoint = "example.googleapis.com"
    api_mtls_endpoint = "example.mtls.googleapis.com"
    sandbox_endpoint = "example.sandbox.googleapis.com"
    sandbox_mtls_endpoint = "example.mtls.sandbox.googleapis.com"
    non_googleapi = "api.example.com"

    assert ChangelogsClient._get_default_mtls_endpoint(None) is None
    assert (
        ChangelogsClient._get_default_mtls_endpoint(api_endpoint) == api_mtls_endpoint
    )
    assert (
        ChangelogsClient._get_default_mtls_endpoint(api_mtls_endpoint)
        == api_mtls_endpoint
    )
    assert (
        ChangelogsClient._get_default_mtls_endpoint(sandbox_endpoint)
        == sandbox_mtls_endpoint
    )
    assert (
        ChangelogsClient._get_default_mtls_endpoint(sandbox_mtls_endpoint)
        == sandbox_mtls_endpoint
    )
    assert ChangelogsClient._get_default_mtls_endpoint(non_googleapi) == non_googleapi


@pytest.mark.parametrize("client_class", [ChangelogsClient, ChangelogsAsyncClient,])
def test_changelogs_client_from_service_account_info(client_class):
    creds = ga_credentials.AnonymousCredentials()
    with mock.patch.object(
        service_account.Credentials, "from_service_account_info"
    ) as factory:
        factory.return_value = creds
        info = {"valid": True}
        client = client_class.from_service_account_info(info)
        assert client.transport._credentials == creds
        assert isinstance(client, client_class)

        assert client.transport._host == "dialogflow.googleapis.com:443"


@pytest.mark.parametrize(
    "transport_class,transport_name",
    [
        (transports.ChangelogsGrpcTransport, "grpc"),
        (transports.ChangelogsGrpcAsyncIOTransport, "grpc_asyncio"),
    ],
)
def test_changelogs_client_service_account_always_use_jwt(
    transport_class, transport_name
):
    with mock.patch.object(
        service_account.Credentials, "with_always_use_jwt_access", create=True
    ) as use_jwt:
        creds = service_account.Credentials(None, None, None)
        transport = transport_class(credentials=creds, always_use_jwt_access=True)
        use_jwt.assert_called_once_with(True)

    with mock.patch.object(
        service_account.Credentials, "with_always_use_jwt_access", create=True
    ) as use_jwt:
        creds = service_account.Credentials(None, None, None)
        transport = transport_class(credentials=creds, always_use_jwt_access=False)
        use_jwt.assert_not_called()


@pytest.mark.parametrize("client_class", [ChangelogsClient, ChangelogsAsyncClient,])
def test_changelogs_client_from_service_account_file(client_class):
    creds = ga_credentials.AnonymousCredentials()
    with mock.patch.object(
        service_account.Credentials, "from_service_account_file"
    ) as factory:
        factory.return_value = creds
        client = client_class.from_service_account_file("dummy/file/path.json")
        assert client.transport._credentials == creds
        assert isinstance(client, client_class)

        client = client_class.from_service_account_json("dummy/file/path.json")
        assert client.transport._credentials == creds
        assert isinstance(client, client_class)

        assert client.transport._host == "dialogflow.googleapis.com:443"


def test_changelogs_client_get_transport_class():
    transport = ChangelogsClient.get_transport_class()
    available_transports = [
        transports.ChangelogsGrpcTransport,
    ]
    assert transport in available_transports

    transport = ChangelogsClient.get_transport_class("grpc")
    assert transport == transports.ChangelogsGrpcTransport


@pytest.mark.parametrize(
    "client_class,transport_class,transport_name",
    [
        (ChangelogsClient, transports.ChangelogsGrpcTransport, "grpc"),
        (
            ChangelogsAsyncClient,
            transports.ChangelogsGrpcAsyncIOTransport,
            "grpc_asyncio",
        ),
    ],
)
@mock.patch.object(
    ChangelogsClient, "DEFAULT_ENDPOINT", modify_default_endpoint(ChangelogsClient)
)
@mock.patch.object(
    ChangelogsAsyncClient,
    "DEFAULT_ENDPOINT",
    modify_default_endpoint(ChangelogsAsyncClient),
)
def test_changelogs_client_client_options(
    client_class, transport_class, transport_name
):
    # Check that if channel is provided we won't create a new one.
    with mock.patch.object(ChangelogsClient, "get_transport_class") as gtc:
        transport = transport_class(credentials=ga_credentials.AnonymousCredentials())
        client = client_class(transport=transport)
        gtc.assert_not_called()

    # Check that if channel is provided via str we will create a new one.
    with mock.patch.object(ChangelogsClient, "get_transport_class") as gtc:
        client = client_class(transport=transport_name)
        gtc.assert_called()

    # Check the case api_endpoint is provided.
    options = client_options.ClientOptions(api_endpoint="squid.clam.whelk")
    with mock.patch.object(transport_class, "__init__") as patched:
        patched.return_value = None
        client = client_class(transport=transport_name, client_options=options)
        patched.assert_called_once_with(
            credentials=None,
            credentials_file=None,
            host="squid.clam.whelk",
            scopes=None,
            client_cert_source_for_mtls=None,
            quota_project_id=None,
            client_info=transports.base.DEFAULT_CLIENT_INFO,
            always_use_jwt_access=True,
        )

    # Check the case api_endpoint is not provided and GOOGLE_API_USE_MTLS_ENDPOINT is
    # "never".
    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_MTLS_ENDPOINT": "never"}):
        with mock.patch.object(transport_class, "__init__") as patched:
            patched.return_value = None
            client = client_class(transport=transport_name)
            patched.assert_called_once_with(
                credentials=None,
                credentials_file=None,
                host=client.DEFAULT_ENDPOINT,
                scopes=None,
                client_cert_source_for_mtls=None,
                quota_project_id=None,
                client_info=transports.base.DEFAULT_CLIENT_INFO,
                always_use_jwt_access=True,
            )

    # Check the case api_endpoint is not provided and GOOGLE_API_USE_MTLS_ENDPOINT is
    # "always".
    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_MTLS_ENDPOINT": "always"}):
        with mock.patch.object(transport_class, "__init__") as patched:
            patched.return_value = None
            client = client_class(transport=transport_name)
            patched.assert_called_once_with(
                credentials=None,
                credentials_file=None,
                host=client.DEFAULT_MTLS_ENDPOINT,
                scopes=None,
                client_cert_source_for_mtls=None,
                quota_project_id=None,
                client_info=transports.base.DEFAULT_CLIENT_INFO,
                always_use_jwt_access=True,
            )

    # Check the case api_endpoint is not provided and GOOGLE_API_USE_MTLS_ENDPOINT has
    # unsupported value.
    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_MTLS_ENDPOINT": "Unsupported"}):
        with pytest.raises(MutualTLSChannelError):
            client = client_class(transport=transport_name)

    # Check the case GOOGLE_API_USE_CLIENT_CERTIFICATE has unsupported value.
    with mock.patch.dict(
        os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": "Unsupported"}
    ):
        with pytest.raises(ValueError):
            client = client_class(transport=transport_name)

    # Check the case quota_project_id is provided
    options = client_options.ClientOptions(quota_project_id="octopus")
    with mock.patch.object(transport_class, "__init__") as patched:
        patched.return_value = None
        client = client_class(client_options=options, transport=transport_name)
        patched.assert_called_once_with(
            credentials=None,
            credentials_file=None,
            host=client.DEFAULT_ENDPOINT,
            scopes=None,
            client_cert_source_for_mtls=None,
            quota_project_id="octopus",
            client_info=transports.base.DEFAULT_CLIENT_INFO,
            always_use_jwt_access=True,
        )


@pytest.mark.parametrize(
    "client_class,transport_class,transport_name,use_client_cert_env",
    [
        (ChangelogsClient, transports.ChangelogsGrpcTransport, "grpc", "true"),
        (
            ChangelogsAsyncClient,
            transports.ChangelogsGrpcAsyncIOTransport,
            "grpc_asyncio",
            "true",
        ),
        (ChangelogsClient, transports.ChangelogsGrpcTransport, "grpc", "false"),
        (
            ChangelogsAsyncClient,
            transports.ChangelogsGrpcAsyncIOTransport,
            "grpc_asyncio",
            "false",
        ),
    ],
)
@mock.patch.object(
    ChangelogsClient, "DEFAULT_ENDPOINT", modify_default_endpoint(ChangelogsClient)
)
@mock.patch.object(
    ChangelogsAsyncClient,
    "DEFAULT_ENDPOINT",
    modify_default_endpoint(ChangelogsAsyncClient),
)
@mock.patch.dict(os.environ, {"GOOGLE_API_USE_MTLS_ENDPOINT": "auto"})
def test_changelogs_client_mtls_env_auto(
    client_class, transport_class, transport_name, use_client_cert_env
):
    # This tests the endpoint autoswitch behavior. Endpoint is autoswitched to the default
    # mtls endpoint, if GOOGLE_API_USE_CLIENT_CERTIFICATE is "true" and client cert exists.

    # Check the case client_cert_source is provided. Whether client cert is used depends on
    # GOOGLE_API_USE_CLIENT_CERTIFICATE value.
    with mock.patch.dict(
        os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": use_client_cert_env}
    ):
        options = client_options.ClientOptions(
            client_cert_source=client_cert_source_callback
        )
        with mock.patch.object(transport_class, "__init__") as patched:
            patched.return_value = None
            client = client_class(client_options=options, transport=transport_name)

            if use_client_cert_env == "false":
                expected_client_cert_source = None
                expected_host = client.DEFAULT_ENDPOINT
            else:
                expected_client_cert_source = client_cert_source_callback
                expected_host = client.DEFAULT_MTLS_ENDPOINT

            patched.assert_called_once_with(
                credentials=None,
                credentials_file=None,
                host=expected_host,
                scopes=None,
                client_cert_source_for_mtls=expected_client_cert_source,
                quota_project_id=None,
                client_info=transports.base.DEFAULT_CLIENT_INFO,
                always_use_jwt_access=True,
            )

    # Check the case ADC client cert is provided. Whether client cert is used depends on
    # GOOGLE_API_USE_CLIENT_CERTIFICATE value.
    with mock.patch.dict(
        os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": use_client_cert_env}
    ):
        with mock.patch.object(transport_class, "__init__") as patched:
            with mock.patch(
                "google.auth.transport.mtls.has_default_client_cert_source",
                return_value=True,
            ):
                with mock.patch(
                    "google.auth.transport.mtls.default_client_cert_source",
                    return_value=client_cert_source_callback,
                ):
                    if use_client_cert_env == "false":
                        expected_host = client.DEFAULT_ENDPOINT
                        expected_client_cert_source = None
                    else:
                        expected_host = client.DEFAULT_MTLS_ENDPOINT
                        expected_client_cert_source = client_cert_source_callback

                    patched.return_value = None
                    client = client_class(transport=transport_name)
                    patched.assert_called_once_with(
                        credentials=None,
                        credentials_file=None,
                        host=expected_host,
                        scopes=None,
                        client_cert_source_for_mtls=expected_client_cert_source,
                        quota_project_id=None,
                        client_info=transports.base.DEFAULT_CLIENT_INFO,
                        always_use_jwt_access=True,
                    )

    # Check the case client_cert_source and ADC client cert are not provided.
    with mock.patch.dict(
        os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": use_client_cert_env}
    ):
        with mock.patch.object(transport_class, "__init__") as patched:
            with mock.patch(
                "google.auth.transport.mtls.has_default_client_cert_source",
                return_value=False,
            ):
                patched.return_value = None
                client = client_class(transport=transport_name)
                patched.assert_called_once_with(
                    credentials=None,
                    credentials_file=None,
                    host=client.DEFAULT_ENDPOINT,
                    scopes=None,
                    client_cert_source_for_mtls=None,
                    quota_project_id=None,
                    client_info=transports.base.DEFAULT_CLIENT_INFO,
                    always_use_jwt_access=True,
                )


@pytest.mark.parametrize("client_class", [ChangelogsClient, ChangelogsAsyncClient])
@mock.patch.object(
    ChangelogsClient, "DEFAULT_ENDPOINT", modify_default_endpoint(ChangelogsClient)
)
@mock.patch.object(
    ChangelogsAsyncClient,
    "DEFAULT_ENDPOINT",
    modify_default_endpoint(ChangelogsAsyncClient),
)
def test_changelogs_client_get_mtls_endpoint_and_cert_source(client_class):
    mock_client_cert_source = mock.Mock()

    # Test the case GOOGLE_API_USE_CLIENT_CERTIFICATE is "true".
    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": "true"}):
        mock_api_endpoint = "foo"
        options = client_options.ClientOptions(
            client_cert_source=mock_client_cert_source, api_endpoint=mock_api_endpoint
        )
        api_endpoint, cert_source = client_class.get_mtls_endpoint_and_cert_source(
            options
        )
        assert api_endpoint == mock_api_endpoint
        assert cert_source == mock_client_cert_source

    # Test the case GOOGLE_API_USE_CLIENT_CERTIFICATE is "false".
    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": "false"}):
        mock_client_cert_source = mock.Mock()
        mock_api_endpoint = "foo"
        options = client_options.ClientOptions(
            client_cert_source=mock_client_cert_source, api_endpoint=mock_api_endpoint
        )
        api_endpoint, cert_source = client_class.get_mtls_endpoint_and_cert_source(
            options
        )
        assert api_endpoint == mock_api_endpoint
        assert cert_source is None

    # Test the case GOOGLE_API_USE_MTLS_ENDPOINT is "never".
    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_MTLS_ENDPOINT": "never"}):
        api_endpoint, cert_source = client_class.get_mtls_endpoint_and_cert_source()
        assert api_endpoint == client_class.DEFAULT_ENDPOINT
        assert cert_source is None

    # Test the case GOOGLE_API_USE_MTLS_ENDPOINT is "always".
    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_MTLS_ENDPOINT": "always"}):
        api_endpoint, cert_source = client_class.get_mtls_endpoint_and_cert_source()
        assert api_endpoint == client_class.DEFAULT_MTLS_ENDPOINT
        assert cert_source is None

    # Test the case GOOGLE_API_USE_MTLS_ENDPOINT is "auto" and default cert doesn't exist.
    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": "true"}):
        with mock.patch(
            "google.auth.transport.mtls.has_default_client_cert_source",
            return_value=False,
        ):
            api_endpoint, cert_source = client_class.get_mtls_endpoint_and_cert_source()
            assert api_endpoint == client_class.DEFAULT_ENDPOINT
            assert cert_source is None

    # Test the case GOOGLE_API_USE_MTLS_ENDPOINT is "auto" and default cert exists.
    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": "true"}):
        with mock.patch(
            "google.auth.transport.mtls.has_default_client_cert_source",
            return_value=True,
        ):
            with mock.patch(
                "google.auth.transport.mtls.default_client_cert_source",
                return_value=mock_client_cert_source,
            ):
                (
                    api_endpoint,
                    cert_source,
                ) = client_class.get_mtls_endpoint_and_cert_source()
                assert api_endpoint == client_class.DEFAULT_MTLS_ENDPOINT
                assert cert_source == mock_client_cert_source


@pytest.mark.parametrize(
    "client_class,transport_class,transport_name",
    [
        (ChangelogsClient, transports.ChangelogsGrpcTransport, "grpc"),
        (
            ChangelogsAsyncClient,
            transports.ChangelogsGrpcAsyncIOTransport,
            "grpc_asyncio",
        ),
    ],
)
def test_changelogs_client_client_options_scopes(
    client_class, transport_class, transport_name
):
    # Check the case scopes are provided.
    options = client_options.ClientOptions(scopes=["1", "2"],)
    with mock.patch.object(transport_class, "__init__") as patched:
        patched.return_value = None
        client = client_class(client_options=options, transport=transport_name)
        patched.assert_called_once_with(
            credentials=None,
            credentials_file=None,
            host=client.DEFAULT_ENDPOINT,
            scopes=["1", "2"],
            client_cert_source_for_mtls=None,
            quota_project_id=None,
            client_info=transports.base.DEFAULT_CLIENT_INFO,
            always_use_jwt_access=True,
        )


@pytest.mark.parametrize(
    "client_class,transport_class,transport_name,grpc_helpers",
    [
        (ChangelogsClient, transports.ChangelogsGrpcTransport, "grpc", grpc_helpers),
        (
            ChangelogsAsyncClient,
            transports.ChangelogsGrpcAsyncIOTransport,
            "grpc_asyncio",
            grpc_helpers_async,
        ),
    ],
)
def test_changelogs_client_client_options_credentials_file(
    client_class, transport_class, transport_name, grpc_helpers
):
    # Check the case credentials file is provided.
    options = client_options.ClientOptions(credentials_file="credentials.json")

    with mock.patch.object(transport_class, "__init__") as patched:
        patched.return_value = None
        client = client_class(client_options=options, transport=transport_name)
        patched.assert_called_once_with(
            credentials=None,
            credentials_file="credentials.json",
            host=client.DEFAULT_ENDPOINT,
            scopes=None,
            client_cert_source_for_mtls=None,
            quota_project_id=None,
            client_info=transports.base.DEFAULT_CLIENT_INFO,
            always_use_jwt_access=True,
        )


def test_changelogs_client_client_options_from_dict():
    with mock.patch(
        "google.cloud.dialogflowcx_v3beta1.services.changelogs.transports.ChangelogsGrpcTransport.__init__"
    ) as grpc_transport:
        grpc_transport.return_value = None
        client = ChangelogsClient(client_options={"api_endpoint": "squid.clam.whelk"})
        grpc_transport.assert_called_once_with(
            credentials=None,
            credentials_file=None,
            host="squid.clam.whelk",
            scopes=None,
            client_cert_source_for_mtls=None,
            quota_project_id=None,
            client_info=transports.base.DEFAULT_CLIENT_INFO,
            always_use_jwt_access=True,
        )


@pytest.mark.parametrize(
    "client_class,transport_class,transport_name,grpc_helpers",
    [
        (ChangelogsClient, transports.ChangelogsGrpcTransport, "grpc", grpc_helpers),
        (
            ChangelogsAsyncClient,
            transports.ChangelogsGrpcAsyncIOTransport,
            "grpc_asyncio",
            grpc_helpers_async,
        ),
    ],
)
def test_changelogs_client_create_channel_credentials_file(
    client_class, transport_class, transport_name, grpc_helpers
):
    # Check the case credentials file is provided.
    options = client_options.ClientOptions(credentials_file="credentials.json")

    with mock.patch.object(transport_class, "__init__") as patched:
        patched.return_value = None
        client = client_class(client_options=options, transport=transport_name)
        patched.assert_called_once_with(
            credentials=None,
            credentials_file="credentials.json",
            host=client.DEFAULT_ENDPOINT,
            scopes=None,
            client_cert_source_for_mtls=None,
            quota_project_id=None,
            client_info=transports.base.DEFAULT_CLIENT_INFO,
            always_use_jwt_access=True,
        )

    # test that the credentials from file are saved and used as the credentials.
    with mock.patch.object(
        google.auth, "load_credentials_from_file", autospec=True
    ) as load_creds, mock.patch.object(
        google.auth, "default", autospec=True
    ) as adc, mock.patch.object(
        grpc_helpers, "create_channel"
    ) as create_channel:
        creds = ga_credentials.AnonymousCredentials()
        file_creds = ga_credentials.AnonymousCredentials()
        load_creds.return_value = (file_creds, None)
        adc.return_value = (creds, None)
        client = client_class(client_options=options, transport=transport_name)
        create_channel.assert_called_with(
            "dialogflow.googleapis.com:443",
            credentials=file_creds,
            credentials_file=None,
            quota_project_id=None,
            default_scopes=(
                "https://www.googleapis.com/auth/cloud-platform",
                "https://www.googleapis.com/auth/dialogflow",
            ),
            scopes=None,
            default_host="dialogflow.googleapis.com",
            ssl_credentials=None,
            options=[
                ("grpc.max_send_message_length", -1),
                ("grpc.max_receive_message_length", -1),
            ],
        )


@pytest.mark.parametrize("request_type", [changelog.ListChangelogsRequest, dict,])
def test_list_changelogs(request_type, transport: str = "grpc"):
    client = ChangelogsClient(
        credentials=ga_credentials.AnonymousCredentials(), transport=transport,
    )

    # Everything is optional in proto3 as far as the runtime is concerned,
    # and we are mocking out the actual API, so just send an empty request.
    request = request_type()

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.list_changelogs), "__call__") as call:
        # Designate an appropriate return value for the call.
        call.return_value = changelog.ListChangelogsResponse(
            next_page_token="next_page_token_value",
        )
        response = client.list_changelogs(request)

        # Establish that the underlying gRPC stub method was called.
        assert len(call.mock_calls) == 1
        _, args, _ = call.mock_calls[0]
        assert args[0] == changelog.ListChangelogsRequest()

    # Establish that the response is the type that we expect.
    assert isinstance(response, pagers.ListChangelogsPager)
    assert response.next_page_token == "next_page_token_value"


def test_list_changelogs_empty_call():
    # This test is a coverage failsafe to make sure that totally empty calls,
    # i.e. request == None and no flattened fields passed, work.
    client = ChangelogsClient(
        credentials=ga_credentials.AnonymousCredentials(), transport="grpc",
    )

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.list_changelogs), "__call__") as call:
        client.list_changelogs()
        call.assert_called()
        _, args, _ = call.mock_calls[0]
        assert args[0] == changelog.ListChangelogsRequest()


@pytest.mark.asyncio
async def test_list_changelogs_async(
    transport: str = "grpc_asyncio", request_type=changelog.ListChangelogsRequest
):
    client = ChangelogsAsyncClient(
        credentials=ga_credentials.AnonymousCredentials(), transport=transport,
    )

    # Everything is optional in proto3 as far as the runtime is concerned,
    # and we are mocking out the actual API, so just send an empty request.
    request = request_type()

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.list_changelogs), "__call__") as call:
        # Designate an appropriate return value for the call.
        call.return_value = grpc_helpers_async.FakeUnaryUnaryCall(
            changelog.ListChangelogsResponse(next_page_token="next_page_token_value",)
        )
        response = await client.list_changelogs(request)

        # Establish that the underlying gRPC stub method was called.
        assert len(call.mock_calls)
        _, args, _ = call.mock_calls[0]
        assert args[0] == changelog.ListChangelogsRequest()

    # Establish that the response is the type that we expect.
    assert isinstance(response, pagers.ListChangelogsAsyncPager)
    assert response.next_page_token == "next_page_token_value"


@pytest.mark.asyncio
async def test_list_changelogs_async_from_dict():
    await test_list_changelogs_async(request_type=dict)


def test_list_changelogs_field_headers():
    client = ChangelogsClient(credentials=ga_credentials.AnonymousCredentials(),)

    # Any value that is part of the HTTP/1.1 URI should be sent as
    # a field header. Set these to a non-empty value.
    request = changelog.ListChangelogsRequest()

    request.parent = "parent/value"

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.list_changelogs), "__call__") as call:
        call.return_value = changelog.ListChangelogsResponse()
        client.list_changelogs(request)

        # Establish that the underlying gRPC stub method was called.
        assert len(call.mock_calls) == 1
        _, args, _ = call.mock_calls[0]
        assert args[0] == request

    # Establish that the field header was sent.
    _, _, kw = call.mock_calls[0]
    assert ("x-goog-request-params", "parent=parent/value",) in kw["metadata"]


@pytest.mark.asyncio
async def test_list_changelogs_field_headers_async():
    client = ChangelogsAsyncClient(credentials=ga_credentials.AnonymousCredentials(),)

    # Any value that is part of the HTTP/1.1 URI should be sent as
    # a field header. Set these to a non-empty value.
    request = changelog.ListChangelogsRequest()

    request.parent = "parent/value"

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.list_changelogs), "__call__") as call:
        call.return_value = grpc_helpers_async.FakeUnaryUnaryCall(
            changelog.ListChangelogsResponse()
        )
        await client.list_changelogs(request)

        # Establish that the underlying gRPC stub method was called.
        assert len(call.mock_calls)
        _, args, _ = call.mock_calls[0]
        assert args[0] == request

    # Establish that the field header was sent.
    _, _, kw = call.mock_calls[0]
    assert ("x-goog-request-params", "parent=parent/value",) in kw["metadata"]


def test_list_changelogs_flattened():
    client = ChangelogsClient(credentials=ga_credentials.AnonymousCredentials(),)

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.list_changelogs), "__call__") as call:
        # Designate an appropriate return value for the call.
        call.return_value = changelog.ListChangelogsResponse()
        # Call the method with a truthy value for each flattened field,
        # using the keyword arguments to the method.
        client.list_changelogs(parent="parent_value",)

        # Establish that the underlying call was made with the expected
        # request object values.
        assert len(call.mock_calls) == 1
        _, args, _ = call.mock_calls[0]
        arg = args[0].parent
        mock_val = "parent_value"
        assert arg == mock_val


def test_list_changelogs_flattened_error():
    client = ChangelogsClient(credentials=ga_credentials.AnonymousCredentials(),)

    # Attempting to call a method with both a request object and flattened
    # fields is an error.
    with pytest.raises(ValueError):
        client.list_changelogs(
            changelog.ListChangelogsRequest(), parent="parent_value",
        )


@pytest.mark.asyncio
async def test_list_changelogs_flattened_async():
    client = ChangelogsAsyncClient(credentials=ga_credentials.AnonymousCredentials(),)

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.list_changelogs), "__call__") as call:
        # Designate an appropriate return value for the call.
        call.return_value = changelog.ListChangelogsResponse()

        call.return_value = grpc_helpers_async.FakeUnaryUnaryCall(
            changelog.ListChangelogsResponse()
        )
        # Call the method with a truthy value for each flattened field,
        # using the keyword arguments to the method.
        response = await client.list_changelogs(parent="parent_value",)

        # Establish that the underlying call was made with the expected
        # request object values.
        assert len(call.mock_calls)
        _, args, _ = call.mock_calls[0]
        arg = args[0].parent
        mock_val = "parent_value"
        assert arg == mock_val


@pytest.mark.asyncio
async def test_list_changelogs_flattened_error_async():
    client = ChangelogsAsyncClient(credentials=ga_credentials.AnonymousCredentials(),)

    # Attempting to call a method with both a request object and flattened
    # fields is an error.
    with pytest.raises(ValueError):
        await client.list_changelogs(
            changelog.ListChangelogsRequest(), parent="parent_value",
        )


def test_list_changelogs_pager(transport_name: str = "grpc"):
    client = ChangelogsClient(
        credentials=ga_credentials.AnonymousCredentials, transport=transport_name,
    )

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.list_changelogs), "__call__") as call:
        # Set the response to a series of pages.
        call.side_effect = (
            changelog.ListChangelogsResponse(
                changelogs=[
                    changelog.Changelog(),
                    changelog.Changelog(),
                    changelog.Changelog(),
                ],
                next_page_token="abc",
            ),
            changelog.ListChangelogsResponse(changelogs=[], next_page_token="def",),
            changelog.ListChangelogsResponse(
                changelogs=[changelog.Changelog(),], next_page_token="ghi",
            ),
            changelog.ListChangelogsResponse(
                changelogs=[changelog.Changelog(), changelog.Changelog(),],
            ),
            RuntimeError,
        )

        metadata = ()
        metadata = tuple(metadata) + (
            gapic_v1.routing_header.to_grpc_metadata((("parent", ""),)),
        )
        pager = client.list_changelogs(request={})

        assert pager._metadata == metadata

        results = [i for i in pager]
        assert len(results) == 6
        assert all(isinstance(i, changelog.Changelog) for i in results)


def test_list_changelogs_pages(transport_name: str = "grpc"):
    client = ChangelogsClient(
        credentials=ga_credentials.AnonymousCredentials, transport=transport_name,
    )

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.list_changelogs), "__call__") as call:
        # Set the response to a series of pages.
        call.side_effect = (
            changelog.ListChangelogsResponse(
                changelogs=[
                    changelog.Changelog(),
                    changelog.Changelog(),
                    changelog.Changelog(),
                ],
                next_page_token="abc",
            ),
            changelog.ListChangelogsResponse(changelogs=[], next_page_token="def",),
            changelog.ListChangelogsResponse(
                changelogs=[changelog.Changelog(),], next_page_token="ghi",
            ),
            changelog.ListChangelogsResponse(
                changelogs=[changelog.Changelog(), changelog.Changelog(),],
            ),
            RuntimeError,
        )
        pages = list(client.list_changelogs(request={}).pages)
        for page_, token in zip(pages, ["abc", "def", "ghi", ""]):
            assert page_.raw_page.next_page_token == token


@pytest.mark.asyncio
async def test_list_changelogs_async_pager():
    client = ChangelogsAsyncClient(credentials=ga_credentials.AnonymousCredentials,)

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(
        type(client.transport.list_changelogs), "__call__", new_callable=mock.AsyncMock
    ) as call:
        # Set the response to a series of pages.
        call.side_effect = (
            changelog.ListChangelogsResponse(
                changelogs=[
                    changelog.Changelog(),
                    changelog.Changelog(),
                    changelog.Changelog(),
                ],
                next_page_token="abc",
            ),
            changelog.ListChangelogsResponse(changelogs=[], next_page_token="def",),
            changelog.ListChangelogsResponse(
                changelogs=[changelog.Changelog(),], next_page_token="ghi",
            ),
            changelog.ListChangelogsResponse(
                changelogs=[changelog.Changelog(), changelog.Changelog(),],
            ),
            RuntimeError,
        )
        async_pager = await client.list_changelogs(request={},)
        assert async_pager.next_page_token == "abc"
        responses = []
        async for response in async_pager:
            responses.append(response)

        assert len(responses) == 6
        assert all(isinstance(i, changelog.Changelog) for i in responses)


@pytest.mark.asyncio
async def test_list_changelogs_async_pages():
    client = ChangelogsAsyncClient(credentials=ga_credentials.AnonymousCredentials,)

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(
        type(client.transport.list_changelogs), "__call__", new_callable=mock.AsyncMock
    ) as call:
        # Set the response to a series of pages.
        call.side_effect = (
            changelog.ListChangelogsResponse(
                changelogs=[
                    changelog.Changelog(),
                    changelog.Changelog(),
                    changelog.Changelog(),
                ],
                next_page_token="abc",
            ),
            changelog.ListChangelogsResponse(changelogs=[], next_page_token="def",),
            changelog.ListChangelogsResponse(
                changelogs=[changelog.Changelog(),], next_page_token="ghi",
            ),
            changelog.ListChangelogsResponse(
                changelogs=[changelog.Changelog(), changelog.Changelog(),],
            ),
            RuntimeError,
        )
        pages = []
        async for page_ in (await client.list_changelogs(request={})).pages:
            pages.append(page_)
        for page_, token in zip(pages, ["abc", "def", "ghi", ""]):
            assert page_.raw_page.next_page_token == token


@pytest.mark.parametrize("request_type", [changelog.GetChangelogRequest, dict,])
def test_get_changelog(request_type, transport: str = "grpc"):
    client = ChangelogsClient(
        credentials=ga_credentials.AnonymousCredentials(), transport=transport,
    )

    # Everything is optional in proto3 as far as the runtime is concerned,
    # and we are mocking out the actual API, so just send an empty request.
    request = request_type()

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.get_changelog), "__call__") as call:
        # Designate an appropriate return value for the call.
        call.return_value = changelog.Changelog(
            name="name_value",
            user_email="user_email_value",
            display_name="display_name_value",
            action="action_value",
            type_="type__value",
            resource="resource_value",
        )
        response = client.get_changelog(request)

        # Establish that the underlying gRPC stub method was called.
        assert len(call.mock_calls) == 1
        _, args, _ = call.mock_calls[0]
        assert args[0] == changelog.GetChangelogRequest()

    # Establish that the response is the type that we expect.
    assert isinstance(response, changelog.Changelog)
    assert response.name == "name_value"
    assert response.user_email == "user_email_value"
    assert response.display_name == "display_name_value"
    assert response.action == "action_value"
    assert response.type_ == "type__value"
    assert response.resource == "resource_value"


def test_get_changelog_empty_call():
    # This test is a coverage failsafe to make sure that totally empty calls,
    # i.e. request == None and no flattened fields passed, work.
    client = ChangelogsClient(
        credentials=ga_credentials.AnonymousCredentials(), transport="grpc",
    )

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.get_changelog), "__call__") as call:
        client.get_changelog()
        call.assert_called()
        _, args, _ = call.mock_calls[0]
        assert args[0] == changelog.GetChangelogRequest()


@pytest.mark.asyncio
async def test_get_changelog_async(
    transport: str = "grpc_asyncio", request_type=changelog.GetChangelogRequest
):
    client = ChangelogsAsyncClient(
        credentials=ga_credentials.AnonymousCredentials(), transport=transport,
    )

    # Everything is optional in proto3 as far as the runtime is concerned,
    # and we are mocking out the actual API, so just send an empty request.
    request = request_type()

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.get_changelog), "__call__") as call:
        # Designate an appropriate return value for the call.
        call.return_value = grpc_helpers_async.FakeUnaryUnaryCall(
            changelog.Changelog(
                name="name_value",
                user_email="user_email_value",
                display_name="display_name_value",
                action="action_value",
                type_="type__value",
                resource="resource_value",
            )
        )
        response = await client.get_changelog(request)

        # Establish that the underlying gRPC stub method was called.
        assert len(call.mock_calls)
        _, args, _ = call.mock_calls[0]
        assert args[0] == changelog.GetChangelogRequest()

    # Establish that the response is the type that we expect.
    assert isinstance(response, changelog.Changelog)
    assert response.name == "name_value"
    assert response.user_email == "user_email_value"
    assert response.display_name == "display_name_value"
    assert response.action == "action_value"
    assert response.type_ == "type__value"
    assert response.resource == "resource_value"


@pytest.mark.asyncio
async def test_get_changelog_async_from_dict():
    await test_get_changelog_async(request_type=dict)


def test_get_changelog_field_headers():
    client = ChangelogsClient(credentials=ga_credentials.AnonymousCredentials(),)

    # Any value that is part of the HTTP/1.1 URI should be sent as
    # a field header. Set these to a non-empty value.
    request = changelog.GetChangelogRequest()

    request.name = "name/value"

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.get_changelog), "__call__") as call:
        call.return_value = changelog.Changelog()
        client.get_changelog(request)

        # Establish that the underlying gRPC stub method was called.
        assert len(call.mock_calls) == 1
        _, args, _ = call.mock_calls[0]
        assert args[0] == request

    # Establish that the field header was sent.
    _, _, kw = call.mock_calls[0]
    assert ("x-goog-request-params", "name=name/value",) in kw["metadata"]


@pytest.mark.asyncio
async def test_get_changelog_field_headers_async():
    client = ChangelogsAsyncClient(credentials=ga_credentials.AnonymousCredentials(),)

    # Any value that is part of the HTTP/1.1 URI should be sent as
    # a field header. Set these to a non-empty value.
    request = changelog.GetChangelogRequest()

    request.name = "name/value"

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.get_changelog), "__call__") as call:
        call.return_value = grpc_helpers_async.FakeUnaryUnaryCall(changelog.Changelog())
        await client.get_changelog(request)

        # Establish that the underlying gRPC stub method was called.
        assert len(call.mock_calls)
        _, args, _ = call.mock_calls[0]
        assert args[0] == request

    # Establish that the field header was sent.
    _, _, kw = call.mock_calls[0]
    assert ("x-goog-request-params", "name=name/value",) in kw["metadata"]


def test_get_changelog_flattened():
    client = ChangelogsClient(credentials=ga_credentials.AnonymousCredentials(),)

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.get_changelog), "__call__") as call:
        # Designate an appropriate return value for the call.
        call.return_value = changelog.Changelog()
        # Call the method with a truthy value for each flattened field,
        # using the keyword arguments to the method.
        client.get_changelog(name="name_value",)

        # Establish that the underlying call was made with the expected
        # request object values.
        assert len(call.mock_calls) == 1
        _, args, _ = call.mock_calls[0]
        arg = args[0].name
        mock_val = "name_value"
        assert arg == mock_val


def test_get_changelog_flattened_error():
    client = ChangelogsClient(credentials=ga_credentials.AnonymousCredentials(),)

    # Attempting to call a method with both a request object and flattened
    # fields is an error.
    with pytest.raises(ValueError):
        client.get_changelog(
            changelog.GetChangelogRequest(), name="name_value",
        )


@pytest.mark.asyncio
async def test_get_changelog_flattened_async():
    client = ChangelogsAsyncClient(credentials=ga_credentials.AnonymousCredentials(),)

    # Mock the actual call within the gRPC stub, and fake the request.
    with mock.patch.object(type(client.transport.get_changelog), "__call__") as call:
        # Designate an appropriate return value for the call.
        call.return_value = changelog.Changelog()

        call.return_value = grpc_helpers_async.FakeUnaryUnaryCall(changelog.Changelog())
        # Call the method with a truthy value for each flattened field,
        # using the keyword arguments to the method.
        response = await client.get_changelog(name="name_value",)

        # Establish that the underlying call was made with the expected
        # request object values.
        assert len(call.mock_calls)
        _, args, _ = call.mock_calls[0]
        arg = args[0].name
        mock_val = "name_value"
        assert arg == mock_val


@pytest.mark.asyncio
async def test_get_changelog_flattened_error_async():
    client = ChangelogsAsyncClient(credentials=ga_credentials.AnonymousCredentials(),)

    # Attempting to call a method with both a request object and flattened
    # fields is an error.
    with pytest.raises(ValueError):
        await client.get_changelog(
            changelog.GetChangelogRequest(), name="name_value",
        )


def test_credentials_transport_error():
    # It is an error to provide credentials and a transport instance.
    transport = transports.ChangelogsGrpcTransport(
        credentials=ga_credentials.AnonymousCredentials(),
    )
    with pytest.raises(ValueError):
        client = ChangelogsClient(
            credentials=ga_credentials.AnonymousCredentials(), transport=transport,
        )

    # It is an error to provide a credentials file and a transport instance.
    transport = transports.ChangelogsGrpcTransport(
        credentials=ga_credentials.AnonymousCredentials(),
    )
    with pytest.raises(ValueError):
        client = ChangelogsClient(
            client_options={"credentials_file": "credentials.json"},
            transport=transport,
        )

    # It is an error to provide an api_key and a transport instance.
    transport = transports.ChangelogsGrpcTransport(
        credentials=ga_credentials.AnonymousCredentials(),
    )
    options = client_options.ClientOptions()
    options.api_key = "api_key"
    with pytest.raises(ValueError):
        client = ChangelogsClient(client_options=options, transport=transport,)

    # It is an error to provide an api_key and a credential.
    options = mock.Mock()
    options.api_key = "api_key"
    with pytest.raises(ValueError):
        client = ChangelogsClient(
            client_options=options, credentials=ga_credentials.AnonymousCredentials()
        )

    # It is an error to provide scopes and a transport instance.
    transport = transports.ChangelogsGrpcTransport(
        credentials=ga_credentials.AnonymousCredentials(),
    )
    with pytest.raises(ValueError):
        client = ChangelogsClient(
            client_options={"scopes": ["1", "2"]}, transport=transport,
        )


def test_transport_instance():
    # A client may be instantiated with a custom transport instance.
    transport = transports.ChangelogsGrpcTransport(
        credentials=ga_credentials.AnonymousCredentials(),
    )
    client = ChangelogsClient(transport=transport)
    assert client.transport is transport


def test_transport_get_channel():
    # A client may be instantiated with a custom transport instance.
    transport = transports.ChangelogsGrpcTransport(
        credentials=ga_credentials.AnonymousCredentials(),
    )
    channel = transport.grpc_channel
    assert channel

    transport = transports.ChangelogsGrpcAsyncIOTransport(
        credentials=ga_credentials.AnonymousCredentials(),
    )
    channel = transport.grpc_channel
    assert channel


@pytest.mark.parametrize(
    "transport_class",
    [transports.ChangelogsGrpcTransport, transports.ChangelogsGrpcAsyncIOTransport,],
)
def test_transport_adc(transport_class):
    # Test default credentials are used if not provided.
    with mock.patch.object(google.auth, "default") as adc:
        adc.return_value = (ga_credentials.AnonymousCredentials(), None)
        transport_class()
        adc.assert_called_once()


def test_transport_grpc_default():
    # A client should use the gRPC transport by default.
    client = ChangelogsClient(credentials=ga_credentials.AnonymousCredentials(),)
    assert isinstance(client.transport, transports.ChangelogsGrpcTransport,)


def test_changelogs_base_transport_error():
    # Passing both a credentials object and credentials_file should raise an error
    with pytest.raises(core_exceptions.DuplicateCredentialArgs):
        transport = transports.ChangelogsTransport(
            credentials=ga_credentials.AnonymousCredentials(),
            credentials_file="credentials.json",
        )


def test_changelogs_base_transport():
    # Instantiate the base transport.
    with mock.patch(
        "google.cloud.dialogflowcx_v3beta1.services.changelogs.transports.ChangelogsTransport.__init__"
    ) as Transport:
        Transport.return_value = None
        transport = transports.ChangelogsTransport(
            credentials=ga_credentials.AnonymousCredentials(),
        )

    # Every method on the transport should just blindly
    # raise NotImplementedError.
    methods = (
        "list_changelogs",
        "get_changelog",
    )
    for method in methods:
        with pytest.raises(NotImplementedError):
            getattr(transport, method)(request=object())

    with pytest.raises(NotImplementedError):