# Copyright The OpenTelemetry Authors
#
# 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 asyncio
from unittest import mock

import redis
import redis.asyncio

from opentelemetry import trace
from opentelemetry.instrumentation.redis import RedisInstrumentor
from opentelemetry.test.test_base import TestBase
from opentelemetry.trace import SpanKind


class AsyncMock:
    """A sufficient async mock implementation.

    Python 3.7 doesn't have an inbuilt async mock class, so this is used.
    """

    def __init__(self):
        self.mock = mock.Mock()

    async def __call__(self, *args, **kwargs):
        future = asyncio.Future()
        future.set_result("random")
        return future

    def __getattr__(self, item):
        return AsyncMock()


class TestRedis(TestBase):
    def setUp(self):
        super().setUp()
        RedisInstrumentor().instrument(tracer_provider=self.tracer_provider)

    def tearDown(self):
        super().tearDown()
        RedisInstrumentor().uninstrument()

    def test_span_properties(self):
        redis_client = redis.Redis()

        with mock.patch.object(redis_client, "connection"):
            redis_client.get("key")

        spans = self.memory_exporter.get_finished_spans()
        self.assertEqual(len(spans), 1)
        span = spans[0]
        self.assertEqual(span.name, "GET")
        self.assertEqual(span.kind, SpanKind.CLIENT)

    def test_not_recording(self):
        redis_client = redis.Redis()

        mock_tracer = mock.Mock()
        mock_span = mock.Mock()
        mock_span.is_recording.return_value = False
        mock_tracer.start_span.return_value = mock_span
        with mock.patch("opentelemetry.trace.get_tracer") as tracer:
            with mock.patch.object(redis_client, "connection"):
                tracer.return_value = mock_tracer
                redis_client.get("key")
                self.assertFalse(mock_span.is_recording())
                self.assertTrue(mock_span.is_recording.called)
                self.assertFalse(mock_span.set_attribute.called)
                self.assertFalse(mock_span.set_status.called)

    def test_instrument_uninstrument(self):
        redis_client = redis.Redis()

        with mock.patch.object(redis_client, "connection"):
            redis_client.get("key")

        spans = self.memory_exporter.get_finished_spans()
        self.assertEqual(len(spans), 1)
        self.memory_exporter.clear()

        # Test uninstrument
        RedisInstrumentor().uninstrument()

        with mock.patch.object(redis_client, "connection"):
            redis_client.get("key")

        spans = self.memory_exporter.get_finished_spans()
        self.assertEqual(len(spans), 0)
        self.memory_exporter.clear()

        # Test instrument again
        RedisInstrumentor().instrument()

        with mock.patch.object(redis_client, "connection"):
            redis_client.get("key")

        spans = self.memory_exporter.get_finished_spans()
        self.assertEqual(len(spans), 1)

    def test_instrument_uninstrument_async_client_command(self):
        redis_client = redis.asyncio.Redis()

        with mock.patch.object(redis_client, "connection", AsyncMock()):
            asyncio.run(redis_client.get("key"))

        spans = self.memory_exporter.get_finished_spans()
        self.assertEqual(len(spans), 1)
        self.memory_exporter.clear()

        # Test uninstrument
        RedisInstrumentor().uninstrument()

        with mock.patch.object(redis_client, "connection", AsyncMock()):
            asyncio.run(redis_client.get("key"))

        spans = self.memory_exporter.get_finished_spans()
        self.assertEqual(len(spans), 0)
        self.memory_exporter.clear()

        # Test instrument again
        RedisInstrumentor().instrument()

        with mock.patch.object(redis_client, "connection", AsyncMock()):
            asyncio.run(redis_client.get("key"))

        spans = self.memory_exporter.get_finished_spans()
        self.assertEqual(len(spans), 1)

    def test_response_hook(self):
        redis_client = redis.Redis()
        connection = redis.connection.Connection()
        redis_client.connection = connection

        response_attribute_name = "db.redis.response"

        def response_hook(span, conn, response):
            span.set_attribute(response_attribute_name, response)

        RedisInstrumentor().uninstrument()
        RedisInstrumentor().instrument(
            tracer_provider=self.tracer_provider, response_hook=response_hook
        )

        test_value = "test_value"

        with mock.patch.object(connection, "send_command"):
            with mock.patch.object(
                redis_client, "parse_response", return_value=test_value
            ):
                redis_client.get("key")

        spans = self.memory_exporter.get_finished_spans()
        self.assertEqual(len(spans), 1)

        span = spans[0]
        self.assertEqual(
            span.attributes.get(response_attribute_name), test_value
        )

    def test_request_hook(self):
        redis_client = redis.Redis()
        connection = redis.connection.Connection()
        redis_client.connection = connection

        custom_attribute_name = "my.request.attribute"

        def request_hook(span, conn, args, kwargs):
            if span and span.is_recording():
                span.set_attribute(custom_attribute_name, args[0])

        RedisInstrumentor().uninstrument()
        RedisInstrumentor().instrument(
            tracer_provider=self.tracer_provider, request_hook=request_hook
        )

        test_value = "test_value"

        with mock.patch.object(connection, "send_command"):
            with mock.patch.object(
                redis_client, "parse_response", return_value=test_value
            ):
                redis_client.get("key")

        spans = self.memory_exporter.get_finished_spans()
        self.assertEqual(len(spans), 1)

        span = spans[0]
        self.assertEqual(span.attributes.get(custom_attribute_name), "GET")

    def test_query_sanitizer_enabled(self):
        redis_client = redis.Redis()
        connection = redis.connection.Connection()
        redis_client.connection = connection

        RedisInstrumentor().uninstrument()
        RedisInstrumentor().instrument(
            tracer_provider=self.tracer_provider,
            sanitize_query=True,
        )

        with mock.patch.object(redis_client, "connection"):
            redis_client.set("key", "value")

        spans = self.memory_exporter.get_finished_spans()
        self.assertEqual(len(spans), 1)

        span = spans[0]
        self.assertEqual(span.attributes.get("db.statement"), "SET ? ?")

    def test_query_sanitizer(self):
        redis_client = redis.Redis()
        connection = redis.connection.Connection()
        redis_client.connection = connection

        with mock.patch.object(redis_client, "connection"):
            redis_client.set("key", "value")

        spans = self.memory_exporter.get_finished_spans()
        self.assertEqual(len(spans), 1)

        span = spans[0]
        self.assertEqual(span.attributes.get("db.statement"), "SET ? ?")

    def test_no_op_tracer_provider(self):
        RedisInstrumentor().uninstrument()
        tracer_provider = trace.NoOpTracerProvider()
        RedisInstrumentor().instrument(tracer_provider=tracer_provider)

        redis_client = redis.Redis()

        with mock.patch.object(redis_client, "connection"):
            redis_client.get("key")

        spans = self.memory_exporter.get_finished_spans()
        self.assertEqual(len(spans), 0)