"""Tests the configuration file parsing."""

from itertools import product
from random import shuffle
from string import printable
from typing import Iterator, Tuple
from unittest import TestCase

from rcon import Config


def random_passwd() -> str:
    """Generates a random password containing all printable characters."""

    chars = list(printable)
    shuffle(chars)
    return ''.join(chars)


class TestConfig(TestCase):
    """Test the named tuple Config."""

    def setUp(self):
        """Sets up test and target data."""
        self.hosts = [
            'subsubdomain.subdomain.example.com',
            'locahost',
            '127.0.0.1'
        ]
        self.ports = range(65_536)

    @property
    def _sockets(self) -> Iterator[Tuple[str, int]]:
        """Yields (host, port) tuples."""
        return product(self.hosts, self.ports)

    def _test_from_string_with_password(self, host, port):
        """Tests the Config.from_string() method with a password."""
        passwd = random_passwd()
        config = Config.from_string(f'{passwd}@{host}:{port}')
        self.assertEqual(config.host, host)
        self.assertEqual(config.port, port)
        self.assertEqual(config.passwd, passwd)

    def _test_from_string_without_password(self, host, port):
        """Tests the Config.from_string() method without a password."""
        config = Config.from_string(f'{host}:{port}')
        self.assertEqual(config.host, host)
        self.assertEqual(config.port, port)
        self.assertIsNone(config.passwd)

    def test_from_string(self):
        """Tests the Config.from_string() method."""
        for host, port in self._sockets:
            self._test_from_string_with_password(host, port)
            self._test_from_string_without_password(host, port)