# Copyright 2018 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
#
#     https://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.
"""Unit tests."""

import pytest

from google.rpc import status_pb2

from google.cloud import redis_v1beta1
from google.cloud.redis_v1beta1 import enums
from google.cloud.redis_v1beta1.proto import cloud_redis_pb2
from google.longrunning import operations_pb2
from google.protobuf import empty_pb2
from google.protobuf import field_mask_pb2


class MultiCallableStub(object):
    """Stub for the grpc.UnaryUnaryMultiCallable interface."""

    def __init__(self, method, channel_stub):
        self.method = method
        self.channel_stub = channel_stub

    def __call__(self, request, timeout=None, metadata=None, credentials=None):
        self.channel_stub.requests.append((self.method, request))

        response = None
        if self.channel_stub.responses:
            response = self.channel_stub.responses.pop()

        if isinstance(response, Exception):
            raise response

        if response:
            return response


class ChannelStub(object):
    """Stub for the grpc.Channel interface."""

    def __init__(self, responses=[]):
        self.responses = responses
        self.requests = []

    def unary_unary(self,
                    method,
                    request_serializer=None,
                    response_deserializer=None):
        return MultiCallableStub(method, self)


class CustomException(Exception):
    pass


class TestCloudRedisClient(object):
    def test_list_instances(self):
        # Setup Expected Response
        next_page_token = ''
        instances_element = {}
        instances = [instances_element]
        expected_response = {
            'next_page_token': next_page_token,
            'instances': instances
        }
        expected_response = cloud_redis_pb2.ListInstancesResponse(
            **expected_response)

        # Mock the API response
        channel = ChannelStub(responses=[expected_response])
        client = redis_v1beta1.CloudRedisClient(channel=channel)

        # Setup Request
        parent = client.location_path('[PROJECT]', '[LOCATION]')

        paged_list_response = client.list_instances(parent)
        resources = list(paged_list_response)
        assert len(resources) == 1

        assert expected_response.instances[0] == resources[0]

        assert len(channel.requests) == 1
        expected_request = cloud_redis_pb2.ListInstancesRequest(parent=parent)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_list_instances_exception(self):
        channel = ChannelStub(responses=[CustomException()])
        client = redis_v1beta1.CloudRedisClient(channel=channel)

        # Setup request
        parent = client.location_path('[PROJECT]', '[LOCATION]')

        paged_list_response = client.list_instances(parent)
        with pytest.raises(CustomException):
            list(paged_list_response)

    def test_get_instance(self):
        # Setup Expected Response
        name_2 = 'name2-1052831874'
        display_name = 'displayName1615086568'
        location_id = 'locationId552319461'
        alternative_location_id = 'alternativeLocationId-718920621'
        redis_version = 'redisVersion-685310444'
        reserved_ip_range = 'reservedIpRange-1082940580'
        host = 'host3208616'
        port = 3446913
        current_location_id = 'currentLocationId1312712735'
        status_message = 'statusMessage-239442758'
        memory_size_gb = 34199707
        authorized_network = 'authorizedNetwork-1733809270'
        expected_response = {
            'name': name_2,
            'display_name': display_name,
            'location_id': location_id,
            'alternative_location_id': alternative_location_id,
            'redis_version': redis_version,
            'reserved_ip_range': reserved_ip_range,
            'host': host,
            'port': port,
            'current_location_id': current_location_id,
            'status_message': status_message,
            'memory_size_gb': memory_size_gb,
            'authorized_network': authorized_network
        }
        expected_response = cloud_redis_pb2.Instance(**expected_response)

        # Mock the API response
        channel = ChannelStub(responses=[expected_response])
        client = redis_v1beta1.CloudRedisClient(channel=channel)

        # Setup Request
        name = client.instance_path('[PROJECT]', '[LOCATION]', '[INSTANCE]')

        response = client.get_instance(name)
        assert expected_response == response

        assert len(channel.requests) == 1
        expected_request = cloud_redis_pb2.GetInstanceRequest(name=name)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_get_instance_exception(self):
        # Mock the API response
        channel = ChannelStub(responses=[CustomException()])
        client = redis_v1beta1.CloudRedisClient(channel=channel)

        # Setup request
        name = client.instance_path('[PROJECT]', '[LOCATION]', '[INSTANCE]')

        with pytest.raises(CustomException):
            client.get_instance(name)

    def test_create_instance(self):
        # Setup Expected Response
        name = 'name3373707'
        display_name = 'displayName1615086568'
        location_id = 'locationId552319461'
        alternative_location_id = 'alternativeLocationId-718920621'
        redis_version = 'redisVersion-685310444'
        reserved_ip_range = 'reservedIpRange-1082940580'
        host = 'host3208616'
        port = 3446913
        current_location_id = 'currentLocationId1312712735'
        status_message = 'statusMessage-239442758'
        memory_size_gb_2 = 1493816946
        authorized_network = 'authorizedNetwork-1733809270'
        expected_response = {
            'name': name,
            'display_name': display_name,
            'location_id': location_id,
            'alternative_location_id': alternative_location_id,
            'redis_version': redis_version,
            'reserved_ip_range': reserved_ip_range,
            'host': host,
            'port': port,
            'current_location_id': current_location_id,
            'status_message': status_message,
            'memory_size_gb': memory_size_gb_2,
            'authorized_network': authorized_network
        }
        expected_response = cloud_redis_pb2.Instance(**expected_response)
        operation = operations_pb2.Operation(
            name='operations/test_create_instance', done=True)
        operation.response.Pack(expected_response)

        # Mock the API response
        channel = ChannelStub(responses=[operation])
        client = redis_v1beta1.CloudRedisClient(channel=channel)

        # Setup Request
        parent = client.location_path('[PROJECT]', '[LOCATION]')
        instance_id = 'test_instance'
        tier = enums.Instance.Tier.BASIC
        memory_size_gb = 1
        instance = {'tier': tier, 'memory_size_gb': memory_size_gb}

        response = client.create_instance(parent, instance_id, instance)
        result = response.result()
        assert expected_response == result

        assert len(channel.requests) == 1
        expected_request = cloud_redis_pb2.CreateInstanceRequest(
            parent=parent, instance_id=instance_id, instance=instance)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_create_instance_exception(self):
        # Setup Response
        error = status_pb2.Status()
        operation = operations_pb2.Operation(
            name='operations/test_create_instance_exception', done=True)
        operation.error.CopyFrom(error)

        # Mock the API response
        channel = ChannelStub(responses=[operation])
        client = redis_v1beta1.CloudRedisClient(channel=channel)

        # Setup Request
        parent = client.location_path('[PROJECT]', '[LOCATION]')
        instance_id = 'test_instance'
        tier = enums.Instance.Tier.BASIC
        memory_size_gb = 1
        instance = {'tier': tier, 'memory_size_gb': memory_size_gb}

        response = client.create_instance(parent, instance_id, instance)
        exception = response.exception()
        assert exception.errors[0] == error

    def test_update_instance(self):
        # Setup Expected Response
        name = 'name3373707'
        display_name_2 = 'displayName21615000987'
        location_id = 'locationId552319461'
        alternative_location_id = 'alternativeLocationId-718920621'
        redis_version = 'redisVersion-685310444'
        reserved_ip_range = 'reservedIpRange-1082940580'
        host = 'host3208616'
        port = 3446913
        current_location_id = 'currentLocationId1312712735'
        status_message = 'statusMessage-239442758'
        memory_size_gb_2 = 1493816946
        authorized_network = 'authorizedNetwork-1733809270'
        expected_response = {
            'name': name,
            'display_name': display_name_2,
            'location_id': location_id,
            'alternative_location_id': alternative_location_id,
            'redis_version': redis_version,
            'reserved_ip_range': reserved_ip_range,
            'host': host,
            'port': port,
            'current_location_id': current_location_id,
            'status_message': status_message,
            'memory_size_gb': memory_size_gb_2,
            'authorized_network': authorized_network
        }
        expected_response = cloud_redis_pb2.Instance(**expected_response)
        operation = operations_pb2.Operation(
            name='operations/test_update_instance', done=True)
        operation.response.Pack(expected_response)

        # Mock the API response
        channel = ChannelStub(responses=[operation])
        client = redis_v1beta1.CloudRedisClient(channel=channel)

        # Setup Request
        paths_element = 'display_name'
        paths_element_2 = 'memory_size_gb'
        paths = [paths_element, paths_element_2]
        update_mask = {'paths': paths}
        display_name = 'UpdatedDisplayName'
        memory_size_gb = 4
        instance = {
            'display_name': display_name,
            'memory_size_gb': memory_size_gb
        }

        response = client.update_instance(update_mask, instance)
        result = response.result()
        assert expected_response == result

        assert len(channel.requests) == 1
        expected_request = cloud_redis_pb2.UpdateInstanceRequest(
            update_mask=update_mask, instance=instance)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_update_instance_exception(self):
        # Setup Response
        error = status_pb2.Status()
        operation = operations_pb2.Operation(
            name='operations/test_update_instance_exception', done=True)
        operation.error.CopyFrom(error)

        # Mock the API response
        channel = ChannelStub(responses=[operation])
        client = redis_v1beta1.CloudRedisClient(channel=channel)

        # Setup Request
        paths_element = 'display_name'
        paths_element_2 = 'memory_size_gb'
        paths = [paths_element, paths_element_2]
        update_mask = {'paths': paths}
        display_name = 'UpdatedDisplayName'
        memory_size_gb = 4
        instance = {
            'display_name': display_name,
            'memory_size_gb': memory_size_gb
        }

        response = client.update_instance(update_mask, instance)
        exception = response.exception()
        assert exception.errors[0] == error

    def test_delete_instance(self):
        # Setup Expected Response
        expected_response = {}
        expected_response = empty_pb2.Empty(**expected_response)
        operation = operations_pb2.Operation(
            name='operations/test_delete_instance', done=True)
        operation.response.Pack(expected_response)

        # Mock the API response
        channel = ChannelStub(responses=[operation])
        client = redis_v1beta1.CloudRedisClient(channel=channel)

        # Setup Request
        name = client.instance_path('[PROJECT]', '[LOCATION]', '[INSTANCE]')

        response = client.delete_instance(name)
        result = response.result()
        assert expected_response == result

        assert len(channel.requests) == 1
        expected_request = cloud_redis_pb2.DeleteInstanceRequest(name=name)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_delete_instance_exception(self):
        # Setup Response
        error = status_pb2.Status()
        operation = operations_pb2.Operation(
            name='operations/test_delete_instance_exception', done=True)
        operation.error.CopyFrom(error)

        # Mock the API response
        channel = ChannelStub(responses=[operation])
        client = redis_v1beta1.CloudRedisClient(channel=channel)

        # Setup Request
        name = client.instance_path('[PROJECT]', '[LOCATION]', '[INSTANCE]')

        response = client.delete_instance(name)
        exception = response.exception()
        assert exception.errors[0] == error
