# Copyright 2020 The Matrix.org Foundation C.I.C.
#
# 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 logging
from unittest.mock import Mock

from twisted.internet import defer
from twisted.test.proto_helpers import MemoryReactor

from synapse.rest import admin
from synapse.rest.client import login, room
from synapse.server import HomeServer
from synapse.util import Clock

from tests.replication._base import BaseMultiWorkerStreamTestCase

logger = logging.getLogger(__name__)


class PusherShardTestCase(BaseMultiWorkerStreamTestCase):
    """Checks pusher sharding works"""

    servlets = [
        admin.register_servlets_for_client_rest_resource,
        room.register_servlets,
        login.register_servlets,
    ]

    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
        # Register a user who sends a message that we'll get notified about
        self.other_user_id = self.register_user("otheruser", "pass")
        self.other_access_token = self.login("otheruser", "pass")

    def _create_pusher_and_send_msg(self, localpart: str) -> str:
        # Create a user that will get push notifications
        user_id = self.register_user(localpart, "pass")
        access_token = self.login(localpart, "pass")

        # Register a pusher
        user_dict = self.get_success(
            self.hs.get_datastores().main.get_user_by_access_token(access_token)
        )
        assert user_dict is not None
        device_id = user_dict.device_id

        self.get_success(
            self.hs.get_pusherpool().add_or_update_pusher(
                user_id=user_id,
                device_id=device_id,
                kind="http",
                app_id="m.http",
                app_display_name="HTTP Push Notifications",
                device_display_name="pushy push",
                pushkey="a@example.com",
                lang=None,
                data={"url": "https://push.example.com/_matrix/push/v1/notify"},
            )
        )

        self.pump()

        # Create a room
        room = self.helper.create_room_as(user_id, tok=access_token)

        # The other user joins
        self.helper.join(
            room=room, user=self.other_user_id, tok=self.other_access_token
        )

        # The other user sends some messages
        response = self.helper.send(room, body="Hi!", tok=self.other_access_token)
        event_id = response["event_id"]

        return event_id

    def test_send_push_single_worker(self) -> None:
        """Test that registration works when using a pusher worker."""
        http_client_mock = Mock(spec_set=["post_json_get_json"])
        http_client_mock.post_json_get_json.side_effect = (
            lambda *_, **__: defer.succeed({})
        )

        self.make_worker_hs(
            "synapse.app.generic_worker",
            {"worker_name": "pusher1", "pusher_instances": ["pusher1"]},
            proxied_blocklisted_http_client=http_client_mock,
        )

        event_id = self._create_pusher_and_send_msg("user")

        # Advance time a bit, so the pusher will register something has happened
        self.pump()

        http_client_mock.post_json_get_json.assert_called_once()
        self.assertEqual(
            http_client_mock.post_json_get_json.call_args[0][0],
            "https://push.example.com/_matrix/push/v1/notify",
        )
        self.assertEqual(
            event_id,
            http_client_mock.post_json_get_json.call_args[0][1]["notification"][
                "event_id"
            ],
        )

    def test_send_push_multiple_workers(self) -> None:
        """Test that registration works when using sharded pusher workers."""
        http_client_mock1 = Mock(spec_set=["post_json_get_json"])
        http_client_mock1.post_json_get_json.side_effect = (
            lambda *_, **__: defer.succeed({})
        )

        self.make_worker_hs(
            "synapse.app.generic_worker",
            {
                "worker_name": "pusher1",
                "pusher_instances": ["pusher1", "pusher2"],
            },
            proxied_blocklisted_http_client=http_client_mock1,
        )

        http_client_mock2 = Mock(spec_set=["post_json_get_json"])
        http_client_mock2.post_json_get_json.side_effect = (
            lambda *_, **__: defer.succeed({})
        )

        self.make_worker_hs(
            "synapse.app.generic_worker",
            {
                "worker_name": "pusher2",
                "pusher_instances": ["pusher1", "pusher2"],
            },
            proxied_blocklisted_http_client=http_client_mock2,
        )

        # We choose a user name that we know should go to pusher1.
        event_id = self._create_pusher_and_send_msg("user2")

        # Advance time a bit, so the pusher will register something has happened
        self.pump()

        http_client_mock1.post_json_get_json.assert_called_once()
        http_client_mock2.post_json_get_json.assert_not_called()
        self.assertEqual(
            http_client_mock1.post_json_get_json.call_args[0][0],
            "https://push.example.com/_matrix/push/v1/notify",
        )
        self.assertEqual(
            event_id,
            http_client_mock1.post_json_get_json.call_args[0][1]["notification"][
                "event_id"
            ],
        )

        http_client_mock1.post_json_get_json.reset_mock()
        http_client_mock2.post_json_get_json.reset_mock()

        # Now we choose a user name that we know should go to pusher2.
        event_id = self._create_pusher_and_send_msg("user4")

        # Advance time a bit, so the pusher will register something has happened
        self.pump()

        http_client_mock1.post_json_get_json.assert_not_called()
        http_client_mock2.post_json_get_json.assert_called_once()
        self.assertEqual(
            http_client_mock2.post_json_get_json.call_args[0][0],
            "https://push.example.com/_matrix/push/v1/notify",
        )
        self.assertEqual(
            event_id,
            http_client_mock2.post_json_get_json.call_args[0][1]["notification"][
                "event_id"
            ],
        )
