# -*- coding: utf-8 -*-
#
# 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 mock
import pytest

from google.rpc import status_pb2

from google.cloud import dataproc_v1beta2
from google.cloud.dataproc_v1beta2.proto import clusters_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 TestClusterControllerClient(object):
    def test_create_cluster(self):
        # Setup Expected Response
        project_id_2 = 'projectId2939242356'
        cluster_name = 'clusterName-1018081872'
        cluster_uuid = 'clusterUuid-1017854240'
        expected_response = {
            'project_id': project_id_2,
            'cluster_name': cluster_name,
            'cluster_uuid': cluster_uuid
        }
        expected_response = clusters_pb2.Cluster(**expected_response)
        operation = operations_pb2.Operation(
            name='operations/test_create_cluster', done=True)
        operation.response.Pack(expected_response)

        # Mock the API response
        channel = ChannelStub(responses=[operation])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = dataproc_v1beta2.ClusterControllerClient()

        # Setup Request
        project_id = 'projectId-1969970175'
        region = 'region-934795532'
        cluster = {}

        response = client.create_cluster(project_id, region, cluster)
        result = response.result()
        assert expected_response == result

        assert len(channel.requests) == 1
        expected_request = clusters_pb2.CreateClusterRequest(
            project_id=project_id, region=region, cluster=cluster)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

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

        # Mock the API response
        channel = ChannelStub(responses=[operation])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = dataproc_v1beta2.ClusterControllerClient()

        # Setup Request
        project_id = 'projectId-1969970175'
        region = 'region-934795532'
        cluster = {}

        response = client.create_cluster(project_id, region, cluster)
        exception = response.exception()
        assert exception.errors[0] == error

    def test_update_cluster(self):
        # Setup Expected Response
        project_id_2 = 'projectId2939242356'
        cluster_name_2 = 'clusterName2875867491'
        cluster_uuid = 'clusterUuid-1017854240'
        expected_response = {
            'project_id': project_id_2,
            'cluster_name': cluster_name_2,
            'cluster_uuid': cluster_uuid
        }
        expected_response = clusters_pb2.Cluster(**expected_response)
        operation = operations_pb2.Operation(
            name='operations/test_update_cluster', done=True)
        operation.response.Pack(expected_response)

        # Mock the API response
        channel = ChannelStub(responses=[operation])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = dataproc_v1beta2.ClusterControllerClient()

        # Setup Request
        project_id = 'projectId-1969970175'
        region = 'region-934795532'
        cluster_name = 'clusterName-1018081872'
        cluster = {}
        update_mask = {}

        response = client.update_cluster(project_id, region, cluster_name,
                                         cluster, update_mask)
        result = response.result()
        assert expected_response == result

        assert len(channel.requests) == 1
        expected_request = clusters_pb2.UpdateClusterRequest(
            project_id=project_id,
            region=region,
            cluster_name=cluster_name,
            cluster=cluster,
            update_mask=update_mask)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

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

        # Mock the API response
        channel = ChannelStub(responses=[operation])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = dataproc_v1beta2.ClusterControllerClient()

        # Setup Request
        project_id = 'projectId-1969970175'
        region = 'region-934795532'
        cluster_name = 'clusterName-1018081872'
        cluster = {}
        update_mask = {}

        response = client.update_cluster(project_id, region, cluster_name,
                                         cluster, update_mask)
        exception = response.exception()
        assert exception.errors[0] == error

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

        # Mock the API response
        channel = ChannelStub(responses=[operation])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = dataproc_v1beta2.ClusterControllerClient()

        # Setup Request
        project_id = 'projectId-1969970175'
        region = 'region-934795532'
        cluster_name = 'clusterName-1018081872'

        response = client.delete_cluster(project_id, region, cluster_name)
        result = response.result()
        assert expected_response == result

        assert len(channel.requests) == 1
        expected_request = clusters_pb2.DeleteClusterRequest(
            project_id=project_id, region=region, cluster_name=cluster_name)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

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