#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2021 The Matrix.org Foundation C.I.C.
# 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 typing import Optional

from twisted.internet.testing import MemoryReactor

import synapse.rest.admin
from synapse.api.errors import Codes, SynapseError
from synapse.rest.client import login
from synapse.server import HomeServer
from synapse.util import Clock

from tests import unittest


class UsernameAvailableTestCase(unittest.HomeserverTestCase):
    servlets = [
        synapse.rest.admin.register_servlets,
        login.register_servlets,
    ]
    url = "/_synapse/admin/v1/username_available"

    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
        self.register_user("admin", "pass", admin=True)
        self.admin_user_tok = self.login("admin", "pass")

        async def check_username(
            localpart: str,
            guest_access_token: Optional[str] = None,
            assigned_user_id: Optional[str] = None,
            inhibit_user_in_use_error: bool = False,
        ) -> None:
            if localpart == "allowed":
                return
            raise SynapseError(
                400,
                "User ID already taken.",
                errcode=Codes.USER_IN_USE,
            )

        handler = self.hs.get_registration_handler()
        handler.check_username = check_username  # type: ignore[method-assign]

    def test_username_available(self) -> None:
        """
        The endpoint should return a 200 response if the username does not exist
        """

        url = "%s?username=%s" % (self.url, "allowed")
        channel = self.make_request("GET", url, access_token=self.admin_user_tok)

        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertTrue(channel.json_body["available"])

    def test_username_unavailable(self) -> None:
        """
        The endpoint should return a 200 response if the username does not exist
        """

        url = "%s?username=%s" % (self.url, "disallowed")
        channel = self.make_request("GET", url, access_token=self.admin_user_tok)

        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], "M_USER_IN_USE")
        self.assertEqual(channel.json_body["error"], "User ID already taken.")