# Copyright 2017 Google LLC All rights reserved.
#
# 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 datetime
import types
import unittest

import mock


class TestClient(unittest.TestCase):

    PROJECT = "my-prahjekt"

    @staticmethod
    def _get_target_class():
        from google.cloud.firestore_v1.client import Client

        return Client

    def _make_one(self, *args, **kwargs):
        klass = self._get_target_class()
        return klass(*args, **kwargs)

    def _make_default_one(self):
        credentials = _make_credentials()
        return self._make_one(project=self.PROJECT, credentials=credentials)

    def test_constructor(self):
        from google.cloud.firestore_v1.client import DEFAULT_DATABASE

        credentials = _make_credentials()
        client = self._make_one(project=self.PROJECT, credentials=credentials)
        self.assertEqual(client.project, self.PROJECT)
        self.assertEqual(client._credentials, credentials)
        self.assertEqual(client._database, DEFAULT_DATABASE)

    def test_constructor_explicit(self):
        credentials = _make_credentials()
        database = "now-db"
        client = self._make_one(
            project=self.PROJECT, credentials=credentials, database=database
        )
        self.assertEqual(client.project, self.PROJECT)
        self.assertEqual(client._credentials, credentials)
        self.assertEqual(client._database, database)

    @mock.patch(
        "google.cloud.firestore_v1.gapic.firestore_client." "FirestoreClient",
        autospec=True,
        return_value=mock.sentinel.firestore_api,
    )
    def test__firestore_api_property(self, mock_client):
        client = self._make_default_one()
        self.assertIsNone(client._firestore_api_internal)
        firestore_api = client._firestore_api
        self.assertIs(firestore_api, mock_client.return_value)
        self.assertIs(firestore_api, client._firestore_api_internal)
        mock_client.assert_called_once_with(credentials=client._credentials)

        # Call again to show that it is cached, but call count is still 1.
        self.assertIs(client._firestore_api, mock_client.return_value)
        self.assertEqual(mock_client.call_count, 1)

    def test___database_string_property(self):
        credentials = _make_credentials()
        database = "cheeeeez"
        client = self._make_one(
            project=self.PROJECT, credentials=credentials, database=database
        )
        self.assertIsNone(client._database_string_internal)
        database_string = client._database_string
        expected = "projects/{}/databases/{}".format(client.project, client._database)
        self.assertEqual(database_string, expected)
        self.assertIs(database_string, client._database_string_internal)

        # Swap it out with a unique value to verify it is cached.
        client._database_string_internal = mock.sentinel.cached
        self.assertIs(client._database_string, mock.sentinel.cached)

    def test___rpc_metadata_property(self):
        credentials = _make_credentials()
        database = "quanta"
        client = self._make_one(
            project=self.PROJECT, credentials=credentials, database=database
        )

        self.assertEqual(
            client._rpc_metadata,
            [("google-cloud-resource-prefix", client._database_string)],
        )

    def test_collection_factory(self):
        from google.cloud.firestore_v1.collection import CollectionReference

        collection_id = "users"
        client = self._make_default_one()
        collection = client.collection(collection_id)

        self.assertEqual(collection._path, (collection_id,))
        self.assertIs(collection._client, client)
        self.assertIsInstance(collection, CollectionReference)

    def test_collection_factory_nested(self):
        from google.cloud.firestore_v1.collection import CollectionReference

        client = self._make_default_one()
        parts = ("users", "alovelace", "beep")
        collection_path = "/".join(parts)
        collection1 = client.collection(collection_path)

        self.assertEqual(collection1._path, parts)
        self.assertIs(collection1._client, client)
        self.assertIsInstance(collection1, CollectionReference)

        # Make sure using segments gives the same result.
        collection2 = client.collection(*parts)
        self.assertEqual(collection2._path, parts)
        self.assertIs(collection2._client, client)
        self.assertIsInstance(collection2, CollectionReference)

    def test_document_factory(self):
        from google.cloud.firestore_v1.document import DocumentReference

        parts = ("rooms", "roomA")
        client = self._make_default_one()
        doc_path = "/".join(parts)
        document1 = client.document(doc_path)

        self.assertEqual(document1._path, parts)
        self.assertIs(document1._client, client)
        self.assertIsInstance(document1, DocumentReference)

        # Make sure using segments gives the same result.
        document2 = client.document(*parts)
        self.assertEqual(document2._path, parts)
        self.assertIs(document2._client, client)
        self.assertIsInstance(document2, DocumentReference)

    def test_document_factory_nested(self):
        from google.cloud.firestore_v1.document import DocumentReference

        client = self._make_default_one()
        parts = ("rooms", "roomA", "shoes", "dressy")
        doc_path = "/".join(parts)
        document1 = client.document(doc_path)

        self.assertEqual(document1._path, parts)
        self.assertIs(document1._client, client)
        self.assertIsInstance(document1, DocumentReference)

        # Make sure using segments gives the same result.
        document2 = client.document(*parts)
        self.assertEqual(document2._path, parts)
        self.assertIs(document2._client, client)
        self.assertIsInstance(document2, DocumentReference)

    def test_field_path(self):
        klass = self._get_target_class()
        self.assertEqual(klass.field_path("a", "b", "c"), "a.b.c")

    def test_write_option_last_update(self):
        from google.protobuf import timestamp_pb2
        from google.cloud.firestore_v1._helpers import LastUpdateOption

        timestamp = timestamp_pb2.Timestamp(seconds=1299767599, nanos=811111097)

        klass = self._get_target_class()
        option = klass.write_option(last_update_time=timestamp)
        self.assertIsInstance(option, LastUpdateOption)
        self.assertEqual(option._last_update_time, timestamp)

    def test_write_option_exists(self):
        from google.cloud.firestore_v1._helpers import ExistsOption

        klass = self._get_target_class()

        option1 = klass.write_option(exists=False)
        self.assertIsInstance(option1, ExistsOption)
        self.assertFalse(option1._exists)

        option2 = klass.write_option(exists=True)
        self.assertIsInstance(option2, ExistsOption)
        self.assertTrue(option2._exists)

    def test_write_open_neither_arg(self):
        from google.cloud.firestore_v1.client import _BAD_OPTION_ERR

        klass = self._get_target_class()
        with self.assertRaises(TypeError) as exc_info:
            klass.write_option()

        self.assertEqual(exc_info.exception.args, (_BAD_OPTION_ERR,))

    def test_write_multiple_args(self):
        from google.cloud.firestore_v1.client import _BAD_OPTION_ERR

        klass = self._get_target_class()
        with self.assertRaises(TypeError) as exc_info:
            klass.write_option(exists=False, last_update_time=mock.sentinel.timestamp)

        self.assertEqual(exc_info.exception.args, (_BAD_OPTION_ERR,))

    def test_write_bad_arg(self):
        from google.cloud.firestore_v1.client import _BAD_OPTION_ERR

        klass = self._get_target_class()
        with self.assertRaises(TypeError) as exc_info:
            klass.write_option(spinach="popeye")

        extra = "{!r} was provided".format("spinach")
        self.assertEqual(exc_info.exception.args, (_BAD_OPTION_ERR, extra))

    def test_collections(self):
        from google.api_core.page_iterator import Iterator
        from google.api_core.page_iterator import Page
        from google.cloud.firestore_v1.collection import CollectionReference

        collection_ids = ["users", "projects"]
        client = self._make_default_one()
        firestore_api = mock.Mock(spec=["list_collection_ids"])
        client._firestore_api_internal = firestore_api

        class _Iterator(Iterator):
            def __init__(self, pages):
                super(_Iterator, self).__init__(client=None)
                self._pages = pages

            def _next_page(self):
                if self._pages:
                    page, self._pages = self._pages[0], self._pages[1:]
                    return Page(self, page, self.item_to_value)

        iterator = _Iterator(pages=[collection_ids])
        firestore_api.list_collection_ids.return_value = iterator

        collections = list(client.collections())

        self.assertEqual(len(collections), len(collection_ids))
        for collection, collection_id in zip(collections, collection_ids):
            self.assertIsInstance(collection, CollectionReference)
            self.assertEqual(collection.parent, None)
            self.assertEqual(collection.id, collection_id)

        firestore_api.list_collection_ids.assert_called_once_with(
            client._database_string, metadata=client._rpc_metadata
        )

    def _get_all_helper(self, client, references, document_pbs, **kwargs):
        # Create a minimal fake GAPIC with a dummy response.
        firestore_api = mock.Mock(spec=["batch_get_documents"])
        response_iterator = iter(document_pbs)
        firestore_api.batch_get_documents.return_value = response_iterator

        # Attach the fake GAPIC to a real client.
        client._firestore_api_internal = firestore_api

        # Actually call get_all().
        snapshots = client.get_all(references, **kwargs)
        self.assertIsInstance(snapshots, types.GeneratorType)

        return list(snapshots)

    def _info_for_get_all(self, data1, data2):
        client = self._make_default_one()
        document1 = client.document("pineapple", "lamp1")
        document2 = client.document("pineapple", "lamp2")

        # Make response protobufs.
        document_pb1, read_time = _doc_get_info(document1._document_path, data1)
        response1 = _make_batch_response(found=document_pb1, read_time=read_time)

        document_pb2, read_time = _doc_get_info(document2._document_path, data2)
        response2 = _make_batch_response(found=document_pb2, read_time=read_time)

        return client, document1, document2, response1, response2

    def test_get_all(self):
        from google.cloud.firestore_v1.proto import common_pb2
        from google.cloud.firestore_v1.document import DocumentSnapshot

        data1 = {"a": u"cheese"}
        data2 = {"b": True, "c": 18}
        info = self._info_for_get_all(data1, data2)
        client, document1, document2, response1, response2 = info

        # Exercise the mocked ``batch_get_documents``.
        field_paths = ["a", "b"]
        snapshots = self._get_all_helper(
            client,
            [document1, document2],
            [response1, response2],
            field_paths=field_paths,
        )
        self.assertEqual(len(snapshots), 2)

        snapshot1 = snapshots[0]
        self.assertIsInstance(snapshot1, DocumentSnapshot)
        self.assertIs(snapshot1._reference, document1)
        self.assertEqual(snapshot1._data, data1)

        snapshot2 = snapshots[1]
        self.assertIsInstance(snapshot2, DocumentSnapshot)
        self.assertIs(snapshot2._reference, document2)
        self.assertEqual(snapshot2._data, data2)

        # Verify the call to the mock.
        doc_paths = [document1._document_path, document2._document_path]
        mask = common_pb2.DocumentMask(field_paths=field_paths)
        client._firestore_api.batch_get_documents.assert_called_once_with(
            client._database_string,
            doc_paths,
            mask,
            transaction=None,
            metadata=client._rpc_metadata,
        )

    def test_get_all_with_transaction(self):
        from google.cloud.firestore_v1.document import DocumentSnapshot

        data = {"so-much": 484}
        info = self._info_for_get_all(data, {})
        client, document, _, response, _ = info
        transaction = client.transaction()
        txn_id = b"the-man-is-non-stop"
        transaction._id = txn_id

        # Exercise the mocked ``batch_get_documents``.
        snapshots = self._get_all_helper(
            client, [document], [response], transaction=transaction
        )
        self.assertEqual(len(snapshots), 1)

        snapshot = snapshots[0]
        self.assertIsInstance(snapshot, DocumentSnapshot)
        self.assertIs(snapshot._reference, document)
        self.assertEqual(snapshot._data, data)

        # Verify the call to the mock.
        doc_paths = [document._document_path]
        client._firestore_api.batch_get_documents.assert_called_once_with(
            client._database_string,
            doc_paths,
            None,
            transaction=txn_id,
            metadata=client._rpc_metadata,
        )

    def test_get_all_unknown_result(self):
        from google.cloud.firestore_v1.client import _BAD_DOC_TEMPLATE

        info = self._info_for_get_all({"z": 28.5}, {})
        client, document, _, _, response = info

        # Exercise the mocked ``batch_get_documents``.
        with self.assertRaises(ValueError) as exc_info:
            self._get_all_helper(client, [document], [response])

        err_msg = _BAD_DOC_TEMPLATE.format(response.found.name)
        self.assertEqual(exc_info.exception.args, (err_msg,))

        # Verify the call to the mock.
        doc_paths = [document._document_path]
        client._firestore_api.batch_get_documents.assert_called_once_with(
            client._database_string,
            doc_paths,
            None,
            transaction=None,
            metadata=client._rpc_metadata,
        )

    def test_get_all_wrong_order(self):
        from google.cloud.firestore_v1.document import DocumentSnapshot

        data1 = {"up": 10}
        data2 = {"down": -10}
        info = self._info_for_get_all(data1, data2)
        client, document1, document2, response1, response2 = info
        document3 = client.document("pineapple", "lamp3")
        response3 = _make_batch_response(missing=document3._document_path)

        # Exercise the mocked ``batch_get_documents``.
        snapshots = self._get_all_helper(
            client, [document1, document2, document3], [response2, response1, response3]
        )

        self.assertEqual(len(snapshots), 3)

        snapshot1 = snapshots[0]
        self.assertIsInstance(snapshot1, DocumentSnapshot)
        self.assertIs(snapshot1._reference, document2)
        self.assertEqual(snapshot1._data, data2)

        snapshot2 = snapshots[1]
        self.assertIsInstance(snapshot2, DocumentSnapshot)
        self.assertIs(snapshot2._reference, document1)
        self.assertEqual(snapshot2._data, data1)

        self.assertFalse(snapshots[2].exists)

        # Verify the call to the mock.
        doc_paths = [
            document1._document_path,
            document2._document_path,
            document3._document_path,
        ]
        client._firestore_api.batch_get_documents.assert_called_once_with(
            client._database_string,
            doc_paths,
            None,
            transaction=None,
            metadata=client._rpc_metadata,
        )

    def test_batch(self):
        from google.cloud.firestore_v1.batch import WriteBatch

        client = self._make_default_one()
        batch = client.batch()
        self.assertIsInstance(batch, WriteBatch)
        self.assertIs(batch._client, client)
        self.assertEqual(batch._write_pbs, [])

    def test_transaction(self):
        from google.cloud.firestore_v1.transaction import Transaction

        client = self._make_default_one()
        transaction = client.transaction(max_attempts=3, read_only=True)
        self.assertIsInstance(transaction, Transaction)
        self.assertEqual(transaction._write_pbs, [])
        self.assertEqual(transaction._max_attempts, 3)
        self.assertTrue(transaction._read_only)
        self.assertIsNone(transaction._id)


class Test__reference_info(unittest.TestCase):
    @staticmethod
    def _call_fut(references):
        from google.cloud.firestore_v1.client import _reference_info

        return _reference_info(references)

    def test_it(self):
        from google.cloud.firestore_v1.client import Client

        credentials = _make_credentials()
        client = Client(project="hi-projject", credentials=credentials)

        reference1 = client.document("a", "b")
        reference2 = client.document("a", "b", "c", "d")
        reference3 = client.document("a", "b")
        reference4 = client.document("f", "g")

        doc_path1 = reference1._document_path
        doc_path2 = reference2._document_path
        doc_path3 = reference3._document_path
        doc_path4 = reference4._document_path
        self.assertEqual(doc_path1, doc_path3)

        document_paths, reference_map = self._call_fut(
            [reference1, reference2, reference3, reference4]
        )
        self.assertEqual(document_paths, [doc_path1, doc_path2, doc_path3, doc_path4])
        # reference3 over-rides reference1.
        expected_map = {
            doc_path2: reference2,
            doc_path3: reference3,
            doc_path4: reference4,
        }
        self.assertEqual(reference_map, expected_map)


class Test__get_reference(unittest.TestCase):
    @staticmethod
    def _call_fut(document_path, reference_map):
        from google.cloud.firestore_v1.client import _get_reference

        return _get_reference(document_path, reference_map)

    def test_success(self):
        doc_path = "a/b/c"
        reference_map = {doc_path: mock.sentinel.reference}
        self.assertIs(self._call_fut(doc_path, reference_map), mock.sentinel.reference)

    def test_failure(self):
        from google.cloud.firestore_v1.client import _BAD_DOC_TEMPLATE

        doc_path = "1/888/call-now"
        with self.assertRaises(ValueError) as exc_info:
            self._call_fut(doc_path, {})

        err_msg = _BAD_DOC_TEMPLATE.format(doc_path)
        self.assertEqual(exc_info.exception.args, (err_msg,))


class Test__parse_batch_get(unittest.TestCase):
    @staticmethod
    def _call_fut(get_doc_response, reference_map, client=mock.sentinel.client):
        from google.cloud.firestore_v1.client import _parse_batch_get

        return _parse_batch_get(get_doc_response, reference_map, client)

    @staticmethod
    def _dummy_ref_string():
        from google.cloud.firestore_v1.client import DEFAULT_DATABASE

        project = u"bazzzz"
        collection_id = u"fizz"
        document_id = u"buzz"
        return u"projects/{}/databases/{}/documents/{}/{}".format(
            project, DEFAULT_DATABASE, collection_id, document_id
        )

    def test_found(self):
        from google.cloud.firestore_v1.proto import document_pb2
        from google.cloud._helpers import _datetime_to_pb_timestamp
        from google.cloud.firestore_v1.document import DocumentSnapshot

        now = datetime.datetime.utcnow()
        read_time = _datetime_to_pb_timestamp(now)
        delta = datetime.timedelta(seconds=100)
        update_time = _datetime_to_pb_timestamp(now - delta)
        create_time = _datetime_to_pb_timestamp(now - 2 * delta)

        ref_string = self._dummy_ref_string()
        document_pb = document_pb2.Document(
            name=ref_string,
            fields={
                "foo": document_pb2.Value(double_value=1.5),
                "bar": document_pb2.Value(string_value=u"skillz"),
            },
            create_time=create_time,
            update_time=update_time,
        )
        response_pb = _make_batch_response(found=document_pb, read_time=read_time)

        reference_map = {ref_string: mock.sentinel.reference}
        snapshot = self._call_fut(response_pb, reference_map)
        self.assertIsInstance(snapshot, DocumentSnapshot)
        self.assertIs(snapshot._reference, mock.sentinel.reference)
        self.assertEqual(snapshot._data, {"foo": 1.5, "bar": u"skillz"})
        self.assertTrue(snapshot._exists)
        self.assertEqual(snapshot.read_time, read_time)
        self.assertEqual(snapshot.create_time, create_time)
        self.assertEqual(snapshot.update_time, update_time)

    def test_missing(self):
        ref_string = self._dummy_ref_string()
        response_pb = _make_batch_response(missing=ref_string)

        snapshot = self._call_fut(response_pb, {})
        self.assertFalse(snapshot.exists)

    def test_unset_result_type(self):
        response_pb = _make_batch_response()
        with self.assertRaises(ValueError):
            self._call_fut(response_pb, {})

    def test_unknown_result_type(self):
        response_pb = mock.Mock(spec=["WhichOneof"])
        response_pb.WhichOneof.return_value = "zoob_value"

        with self.assertRaises(ValueError):
            self._call_fut(response_pb, {})

        response_pb.WhichOneof.assert_called_once_with("result")


class Test__get_doc_mask(unittest.TestCase):
    @staticmethod
    def _call_fut(field_paths):
        from google.cloud.firestore_v1.client import _get_doc_mask

        return _get_doc_mask(field_paths)

    def test_none(self):
        self.assertIsNone(self._call_fut(None))

    def test_paths(self):
        from google.cloud.firestore_v1.proto import common_pb2

        field_paths = ["a.b", "c"]
        result = self._call_fut(field_paths)
        expected = common_pb2.DocumentMask(field_paths=field_paths)
        self.assertEqual(result, expected)


def _make_credentials():
    import google.auth.credentials

    return mock.Mock(spec=google.auth.credentials.Credentials)


def _make_batch_response(**kwargs):
    from google.cloud.firestore_v1.proto import firestore_pb2

    return firestore_pb2.BatchGetDocumentsResponse(**kwargs)


def _doc_get_info(ref_string, values):
    from google.cloud.firestore_v1.proto import document_pb2
    from google.cloud._helpers import _datetime_to_pb_timestamp
    from google.cloud.firestore_v1 import _helpers

    now = datetime.datetime.utcnow()
    read_time = _datetime_to_pb_timestamp(now)
    delta = datetime.timedelta(seconds=100)
    update_time = _datetime_to_pb_timestamp(now - delta)
    create_time = _datetime_to_pb_timestamp(now - 2 * delta)

    document_pb = document_pb2.Document(
        name=ref_string,
        fields=_helpers.encode_dict(values),
        create_time=create_time,
        update_time=update_time,
    )

    return document_pb, read_time
