# -*- 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.cloud.firestore_v1beta1.gapic import firestore_client
from google.cloud.firestore_v1beta1.proto import common_pb2
from google.cloud.firestore_v1beta1.proto import document_pb2
from google.cloud.firestore_v1beta1.proto import firestore_pb2
from google.protobuf import empty_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)

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

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


class CustomException(Exception):
    pass


class TestFirestoreClient(object):
    def test_get_document(self):
        # Setup Expected Response
        name_2 = 'name2-1052831874'
        expected_response = {'name': name_2}
        expected_response = document_pb2.Document(**expected_response)

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

        # Setup Request
        name = client.any_path_path('[PROJECT]', '[DATABASE]', '[DOCUMENT]',
                                    '[ANY_PATH]')

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

        assert len(channel.requests) == 1
        expected_request = firestore_pb2.GetDocumentRequest(name=name)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_get_document_exception(self):
        # Mock the API response
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        name = client.any_path_path('[PROJECT]', '[DATABASE]', '[DOCUMENT]',
                                    '[ANY_PATH]')

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

    def test_list_documents(self):
        # Setup Expected Response
        next_page_token = ''
        documents_element = {}
        documents = [documents_element]
        expected_response = {
            'next_page_token': next_page_token,
            'documents': documents
        }
        expected_response = firestore_pb2.ListDocumentsResponse(
            **expected_response)

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

        # Setup Request
        parent = client.any_path_path('[PROJECT]', '[DATABASE]', '[DOCUMENT]',
                                      '[ANY_PATH]')
        collection_id = 'collectionId-821242276'

        paged_list_response = client.list_documents(parent, collection_id)
        resources = list(paged_list_response)
        assert len(resources) == 1

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

        assert len(channel.requests) == 1
        expected_request = firestore_pb2.ListDocumentsRequest(
            parent=parent, collection_id=collection_id)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_list_documents_exception(self):
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        parent = client.any_path_path('[PROJECT]', '[DATABASE]', '[DOCUMENT]',
                                      '[ANY_PATH]')
        collection_id = 'collectionId-821242276'

        paged_list_response = client.list_documents(parent, collection_id)
        with pytest.raises(CustomException):
            list(paged_list_response)

    def test_create_document(self):
        # Setup Expected Response
        name = 'name3373707'
        expected_response = {'name': name}
        expected_response = document_pb2.Document(**expected_response)

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

        # Setup Request
        parent = client.any_path_path('[PROJECT]', '[DATABASE]', '[DOCUMENT]',
                                      '[ANY_PATH]')
        collection_id = 'collectionId-821242276'
        document_id = 'documentId506676927'
        document = {}

        response = client.create_document(parent, collection_id, document_id,
                                          document)
        assert expected_response == response

        assert len(channel.requests) == 1
        expected_request = firestore_pb2.CreateDocumentRequest(
            parent=parent,
            collection_id=collection_id,
            document_id=document_id,
            document=document)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_create_document_exception(self):
        # Mock the API response
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        parent = client.any_path_path('[PROJECT]', '[DATABASE]', '[DOCUMENT]',
                                      '[ANY_PATH]')
        collection_id = 'collectionId-821242276'
        document_id = 'documentId506676927'
        document = {}

        with pytest.raises(CustomException):
            client.create_document(parent, collection_id, document_id,
                                   document)

    def test_update_document(self):
        # Setup Expected Response
        name = 'name3373707'
        expected_response = {'name': name}
        expected_response = document_pb2.Document(**expected_response)

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

        # Setup Request
        document = {}
        update_mask = {}

        response = client.update_document(document, update_mask)
        assert expected_response == response

        assert len(channel.requests) == 1
        expected_request = firestore_pb2.UpdateDocumentRequest(
            document=document, update_mask=update_mask)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_update_document_exception(self):
        # Mock the API response
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        document = {}
        update_mask = {}

        with pytest.raises(CustomException):
            client.update_document(document, update_mask)

    def test_delete_document(self):
        channel = ChannelStub()
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup Request
        name = client.any_path_path('[PROJECT]', '[DATABASE]', '[DOCUMENT]',
                                    '[ANY_PATH]')

        client.delete_document(name)

        assert len(channel.requests) == 1
        expected_request = firestore_pb2.DeleteDocumentRequest(name=name)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_delete_document_exception(self):
        # Mock the API response
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        name = client.any_path_path('[PROJECT]', '[DATABASE]', '[DOCUMENT]',
                                    '[ANY_PATH]')

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

    def test_batch_get_documents(self):
        # Setup Expected Response
        missing = 'missing1069449574'
        transaction = b'-34'
        expected_response = {'missing': missing, 'transaction': transaction}
        expected_response = firestore_pb2.BatchGetDocumentsResponse(
            **expected_response)

        # Mock the API response
        channel = ChannelStub(responses=[iter([expected_response])])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup Request
        database = client.database_root_path('[PROJECT]', '[DATABASE]')
        documents = []

        response = client.batch_get_documents(database, documents)
        resources = list(response)
        assert len(resources) == 1
        assert expected_response == resources[0]

        assert len(channel.requests) == 1
        expected_request = firestore_pb2.BatchGetDocumentsRequest(
            database=database, documents=documents)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_batch_get_documents_exception(self):
        # Mock the API response
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        database = client.database_root_path('[PROJECT]', '[DATABASE]')
        documents = []

        with pytest.raises(CustomException):
            client.batch_get_documents(database, documents)

    def test_begin_transaction(self):
        # Setup Expected Response
        transaction = b'-34'
        expected_response = {'transaction': transaction}
        expected_response = firestore_pb2.BeginTransactionResponse(
            **expected_response)

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

        # Setup Request
        database = client.database_root_path('[PROJECT]', '[DATABASE]')

        response = client.begin_transaction(database)
        assert expected_response == response

        assert len(channel.requests) == 1
        expected_request = firestore_pb2.BeginTransactionRequest(
            database=database)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_begin_transaction_exception(self):
        # Mock the API response
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        database = client.database_root_path('[PROJECT]', '[DATABASE]')

        with pytest.raises(CustomException):
            client.begin_transaction(database)

    def test_commit(self):
        # Setup Expected Response
        expected_response = {}
        expected_response = firestore_pb2.CommitResponse(**expected_response)

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

        # Setup Request
        database = client.database_root_path('[PROJECT]', '[DATABASE]')
        writes = []

        response = client.commit(database, writes)
        assert expected_response == response

        assert len(channel.requests) == 1
        expected_request = firestore_pb2.CommitRequest(
            database=database, writes=writes)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_commit_exception(self):
        # Mock the API response
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        database = client.database_root_path('[PROJECT]', '[DATABASE]')
        writes = []

        with pytest.raises(CustomException):
            client.commit(database, writes)

    def test_rollback(self):
        channel = ChannelStub()
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup Request
        database = client.database_root_path('[PROJECT]', '[DATABASE]')
        transaction = b'-34'

        client.rollback(database, transaction)

        assert len(channel.requests) == 1
        expected_request = firestore_pb2.RollbackRequest(
            database=database, transaction=transaction)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_rollback_exception(self):
        # Mock the API response
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        database = client.database_root_path('[PROJECT]', '[DATABASE]')
        transaction = b'-34'

        with pytest.raises(CustomException):
            client.rollback(database, transaction)

    def test_run_query(self):
        # Setup Expected Response
        transaction = b'-34'
        skipped_results = 880286183
        expected_response = {
            'transaction': transaction,
            'skipped_results': skipped_results
        }
        expected_response = firestore_pb2.RunQueryResponse(**expected_response)

        # Mock the API response
        channel = ChannelStub(responses=[iter([expected_response])])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup Request
        parent = client.any_path_path('[PROJECT]', '[DATABASE]', '[DOCUMENT]',
                                      '[ANY_PATH]')

        response = client.run_query(parent)
        resources = list(response)
        assert len(resources) == 1
        assert expected_response == resources[0]

        assert len(channel.requests) == 1
        expected_request = firestore_pb2.RunQueryRequest(parent=parent)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_run_query_exception(self):
        # Mock the API response
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        parent = client.any_path_path('[PROJECT]', '[DATABASE]', '[DOCUMENT]',
                                      '[ANY_PATH]')

        with pytest.raises(CustomException):
            client.run_query(parent)

    def test_write(self):
        # Setup Expected Response
        stream_id = 'streamId-315624902'
        stream_token = b'122'
        expected_response = {
            'stream_id': stream_id,
            'stream_token': stream_token
        }
        expected_response = firestore_pb2.WriteResponse(**expected_response)

        # Mock the API response
        channel = ChannelStub(responses=[iter([expected_response])])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup Request
        database = client.database_root_path('[PROJECT]', '[DATABASE]')
        request = {'database': database}
        request = firestore_pb2.WriteRequest(**request)
        requests = [request]

        response = client.write(requests)
        resources = list(response)
        assert len(resources) == 1
        assert expected_response == resources[0]

        assert len(channel.requests) == 1
        actual_requests = channel.requests[0][1]
        assert len(actual_requests) == 1
        actual_request = list(actual_requests)[0]
        assert request == actual_request

    def test_write_exception(self):
        # Mock the API response
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        database = client.database_root_path('[PROJECT]', '[DATABASE]')
        request = {'database': database}

        request = firestore_pb2.WriteRequest(**request)
        requests = [request]

        with pytest.raises(CustomException):
            client.write(requests)

    def test_listen(self):
        # Setup Expected Response
        expected_response = {}
        expected_response = firestore_pb2.ListenResponse(**expected_response)

        # Mock the API response
        channel = ChannelStub(responses=[iter([expected_response])])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup Request
        database = client.database_root_path('[PROJECT]', '[DATABASE]')
        request = {'database': database}
        request = firestore_pb2.ListenRequest(**request)
        requests = [request]

        response = client.listen(requests)
        resources = list(response)
        assert len(resources) == 1
        assert expected_response == resources[0]

        assert len(channel.requests) == 1
        actual_requests = channel.requests[0][1]
        assert len(actual_requests) == 1
        actual_request = list(actual_requests)[0]
        assert request == actual_request

    def test_listen_exception(self):
        # Mock the API response
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        database = client.database_root_path('[PROJECT]', '[DATABASE]')
        request = {'database': database}

        request = firestore_pb2.ListenRequest(**request)
        requests = [request]

        with pytest.raises(CustomException):
            client.listen(requests)

    def test_list_collection_ids(self):
        # Setup Expected Response
        next_page_token = ''
        collection_ids_element = 'collectionIdsElement1368994900'
        collection_ids = [collection_ids_element]
        expected_response = {
            'next_page_token': next_page_token,
            'collection_ids': collection_ids
        }
        expected_response = firestore_pb2.ListCollectionIdsResponse(
            **expected_response)

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

        # Setup Request
        parent = client.any_path_path('[PROJECT]', '[DATABASE]', '[DOCUMENT]',
                                      '[ANY_PATH]')

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

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

        assert len(channel.requests) == 1
        expected_request = firestore_pb2.ListCollectionIdsRequest(
            parent=parent)
        actual_request = channel.requests[0][1]
        assert expected_request == actual_request

    def test_list_collection_ids_exception(self):
        channel = ChannelStub(responses=[CustomException()])
        patch = mock.patch('google.api_core.grpc_helpers.create_channel')
        with patch as create_channel:
            create_channel.return_value = channel
            client = firestore_client.FirestoreClient()

        # Setup request
        parent = client.any_path_path('[PROJECT]', '[DATABASE]', '[DOCUMENT]',
                                      '[ANY_PATH]')

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