#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright (C) 2025 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>.
#
# [This file includes modifications made by New Vector Limited]
#
#

"""Tests REST events for /rtc/endpoints path."""

from twisted.internet.testing import MemoryReactor

from synapse.rest import admin
from synapse.rest.client import login, matrixrtc, register, room, versions
from synapse.server import HomeServer
from synapse.synapse_rust.http_client import HttpClient
from synapse.util.clock import Clock

from tests import unittest
from tests.unittest import HomeserverTestCase, override_config

PATH_PREFIX = "/_matrix/client/unstable/org.matrix.msc4143"
RTC_ENDPOINT = {"type": "focusA", "required_field": "theField"}
LIVEKIT_ENDPOINT = {
    "type": "livekit",
    "livekit_service_url": "https://livekit.example.com",
}


class MatrixRtcTestCase(HomeserverTestCase):
    """Tests /rtc/transports Client-Server REST API."""

    servlets = [
        admin.register_servlets,
        room.register_servlets,
        login.register_servlets,
        register.register_servlets,
        matrixrtc.register_servlets,
    ]

    def prepare(
        self, reactor: MemoryReactor, clock: Clock, homeserver: HomeServer
    ) -> None:
        self.register_user("alice", "password")
        self._alice_tok = self.login("alice", "password")

    def test_matrixrtc_endpoint_not_enabled(self) -> None:
        channel = self.make_request(
            "GET", f"{PATH_PREFIX}/rtc/transports", access_token=self._alice_tok
        )
        self.assertEqual(404, channel.code, channel.json_body)
        self.assertEqual(
            "M_UNRECOGNIZED", channel.json_body["errcode"], channel.json_body
        )

    @override_config({"experimental_features": {"msc4143_enabled": True}})
    def test_matrixrtc_endpoint_requires_authentication(self) -> None:
        channel = self.make_request("GET", f"{PATH_PREFIX}/rtc/transports")
        self.assertEqual(401, channel.code, channel.json_body)

    @override_config(
        {
            "experimental_features": {"msc4143_enabled": True},
            "matrix_rtc": {"transports": [RTC_ENDPOINT]},
        }
    )
    def test_matrixrtc_endpoint_contains_expected_transport(self) -> None:
        channel = self.make_request(
            "GET", f"{PATH_PREFIX}/rtc/transports", access_token=self._alice_tok
        )
        self.assertEqual(200, channel.code, channel.json_body)
        self.assert_dict({"rtc_transports": [RTC_ENDPOINT]}, channel.json_body)

    @override_config(
        {
            "experimental_features": {"msc4143_enabled": True},
            "matrix_rtc": {"transports": []},
        }
    )
    def test_matrixrtc_endpoint_no_transports_configured(self) -> None:
        channel = self.make_request(
            "GET", f"{PATH_PREFIX}/rtc/transports", access_token=self._alice_tok
        )
        self.assertEqual(200, channel.code, channel.json_body)
        self.assert_dict({}, channel.json_body)

    @override_config(
        {
            "experimental_features": {"msc4143_enabled": True},
            "matrix_rtc": {"transports": [LIVEKIT_ENDPOINT]},
        }
    )
    def test_matrixrtc_endpoint_livekit_transport(self) -> None:
        channel = self.make_request(
            "GET", f"{PATH_PREFIX}/rtc/transports", access_token=self._alice_tok
        )
        self.assertEqual(200, channel.code, channel.json_body)
        self.assert_dict({"rtc_transports": [LIVEKIT_ENDPOINT]}, channel.json_body)


class MatrixRtcVersionsTestCase(HomeserverTestCase):
    """Tests that org.matrix.msc4143 is correctly advertised in /versions."""

    servlets = [versions.register_servlets]

    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
        hs = self.setup_test_homeserver()

        # XXX: We must create the Rust HTTP client before we call `reactor.run()` below.
        # Twisted's `MemoryReactor` doesn't invoke `callWhenRunning` callbacks if it's
        # already running and we rely on that to start the Tokio thread pool in Rust. In
        # the future, this may not matter, see https://github.com/twisted/twisted/pull/12514
        self._http_client = hs.get_proxied_http_client()
        _ = HttpClient(
            reactor=hs.get_reactor(),
            user_agent=self._http_client.user_agent.decode("utf8"),
        )

        # This triggers the server startup hooks, which starts the Tokio thread pool
        reactor.run()

        return hs

    def tearDown(self) -> None:
        # MemoryReactor doesn't trigger the shutdown phases, and we want the
        # Tokio thread pool to be stopped
        # XXX: This logic should probably get moved somewhere else
        shutdown_triggers = self.reactor.triggers.get("shutdown", {})
        for phase in ["before", "during", "after"]:
            triggers = shutdown_triggers.get(phase, [])
            for callbable, args, kwargs in triggers:
                callbable(*args, **kwargs)

    def test_msc4143_false_by_default(self) -> None:
        channel = self.make_request("GET", "/_matrix/client/versions")
        self.assertEqual(channel.code, 200, channel.result)
        self.assertFalse(channel.json_body["unstable_features"]["org.matrix.msc4143"])

    @unittest.override_config({"experimental_features": {"msc4143_enabled": True}})
    def test_msc4143_true_if_enabled(self) -> None:
        channel = self.make_request("GET", "/_matrix/client/versions")
        self.assertEqual(channel.code, 200, channel.result)
        self.assertTrue(channel.json_body["unstable_features"]["org.matrix.msc4143"])
