"""Browser-address hints for the service launcher."""
from contextlib import redirect_stdout
from io import StringIO
import unittest
from unittest.mock import patch

from scripts.start_service import access_urls, print_access_urls


class StartServiceAddressTests(unittest.TestCase):
    def test_wildcard_bind_becomes_loopback_and_lan_urls(self):
        with patch('scripts.start_service.socket.gethostname', return_value='server'), \
             patch('scripts.start_service.socket.gethostbyname_ex',
                   return_value=('server', [], ['127.0.0.1', '169.254.2.3', '192.168.2.49'])):
            self.assertEqual(access_urls('0.0.0.0', 8000), [
                'http://127.0.0.1:8000/', 'http://192.168.2.49:8000/'])

    def test_specific_bind_is_the_browser_url(self):
        self.assertEqual(access_urls('127.0.0.1', 8123), ['http://127.0.0.1:8123/'])

    def test_resolution_failure_still_prints_working_local_url(self):
        with patch('scripts.start_service.socket.gethostbyname_ex', side_effect=OSError):
            output = StringIO()
            with redirect_stdout(output):
                print_access_urls('0.0.0.0', 8000)
        self.assertIn('本机访问: http://127.0.0.1:8000/', output.getvalue())
        self.assertIn('0.0.0.0 仅用于服务监听', output.getvalue())


if __name__ == '__main__':
    unittest.main()