#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
from http import HTTPStatus
from unittest.mock import AsyncMock, Mock

from twisted.internet.testing import MemoryReactor

from synapse.handlers.presence import PresenceHandler
from synapse.rest.client import presence
from synapse.server import HomeServer
from synapse.types import UserID
from synapse.util.clock import Clock

from tests import unittest
from tests.unittest import override_config


class PresenceTestCase(unittest.HomeserverTestCase):
    """Tests presence REST API."""

    user_id = "@sid:red"

    user = UserID.from_string(user_id)
    servlets = [presence.register_servlets]

    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
        self.presence_handler = Mock(spec=PresenceHandler)
        self.presence_handler.set_state = AsyncMock(return_value=None)

        hs = self.setup_test_homeserver(
            "red",
            federation_client=Mock(),
            presence_handler=self.presence_handler,
        )

        return hs

    def test_put_presence(self) -> None:
        """
        PUT to the status endpoint with use_presence enabled will call
        set_state on the presence handler.
        """
        self.hs.config.server.presence_enabled = True

        body = {"presence": "here", "status_msg": "beep boop"}
        channel = self.make_request(
            "PUT", "/presence/%s/status" % (self.user_id,), body
        )

        self.assertEqual(channel.code, HTTPStatus.OK)
        self.assertEqual(self.presence_handler.set_state.call_count, 1)

    @unittest.override_config({"use_presence": False})
    def test_put_presence_disabled(self) -> None:
        """
        PUT to the status endpoint with presence disabled will NOT call
        set_state on the presence handler.
        """

        body = {"presence": "here", "status_msg": "beep boop"}
        channel = self.make_request(
            "PUT", "/presence/%s/status" % (self.user_id,), body
        )

        self.assertEqual(channel.code, HTTPStatus.OK)
        self.assertEqual(self.presence_handler.set_state.call_count, 0)

    @unittest.override_config({"presence": {"enabled": "untracked"}})
    def test_put_presence_untracked(self) -> None:
        """
        PUT to the status endpoint with presence untracked will NOT call
        set_state on the presence handler.
        """

        body = {"presence": "here", "status_msg": "beep boop"}
        channel = self.make_request(
            "PUT", "/presence/%s/status" % (self.user_id,), body
        )

        self.assertEqual(channel.code, HTTPStatus.OK)
        self.assertEqual(self.presence_handler.set_state.call_count, 0)

    @override_config(
        {"rc_presence": {"per_user": {"per_second": 0.1, "burst_count": 1}}}
    )
    def test_put_presence_over_ratelimit(self) -> None:
        """
        Multiple PUTs to the status endpoint without sufficient delay will be rate limited.
        """
        self.hs.config.server.presence_enabled = True

        body = {"presence": "here", "status_msg": "beep boop"}
        channel = self.make_request(
            "PUT", "/presence/%s/status" % (self.user_id,), body
        )

        self.assertEqual(channel.code, HTTPStatus.OK)

        body = {"presence": "here", "status_msg": "beep boop"}
        channel = self.make_request(
            "PUT", "/presence/%s/status" % (self.user_id,), body
        )

        self.assertEqual(channel.code, HTTPStatus.TOO_MANY_REQUESTS)
        self.assertEqual(self.presence_handler.set_state.call_count, 1)

    @override_config(
        {"rc_presence": {"per_user": {"per_second": 0.1, "burst_count": 1}}}
    )
    def test_put_presence_within_ratelimit(self) -> None:
        """
        Multiple PUTs to the status endpoint with sufficient delay should all call set_state.
        """
        self.hs.config.server.presence_enabled = True

        body = {"presence": "here", "status_msg": "beep boop"}
        channel = self.make_request(
            "PUT", "/presence/%s/status" % (self.user_id,), body
        )

        self.assertEqual(channel.code, HTTPStatus.OK)

        # Advance time a sufficient amount to avoid rate limiting.
        self.reactor.advance(30)

        body = {"presence": "here", "status_msg": "beep boop"}
        channel = self.make_request(
            "PUT", "/presence/%s/status" % (self.user_id,), body
        )

        self.assertEqual(channel.code, HTTPStatus.OK)
        self.assertEqual(self.presence_handler.set_state.call_count, 2)
