import os
import unittest
from unittest.mock import patch

from dns_sync.config import AppConfig, parse_endpoint_list


class EndpointParsingTests(unittest.TestCase):
    def test_comma_separated_addresses_use_default_port(self):
        endpoints = parse_endpoint_list(
            "npm",
            "192.168.1.3, 192.168.1.4:8081,192.168.1.5",
            81,
        )

        self.assertEqual(
            tuple(endpoint.identity for endpoint in endpoints),
            (
                "npm://192.168.1.3:81",
                "npm://192.168.1.4:8081",
                "npm://192.168.1.5:81",
            ),
        )

    def test_duplicate_is_rejected_after_normalization(self):
        with self.assertRaisesRegex(RuntimeError, "Duplicate NPM"):
            parse_endpoint_list(
                "npm",
                "192.168.1.3,192.168.1.3:81",
                81,
            )

    def test_empty_entry_is_rejected(self):
        with self.assertRaisesRegex(RuntimeError, "empty address"):
            parse_endpoint_list(
                "npm",
                "192.168.1.3,,192.168.1.5",
                81,
            )

    def test_url_scheme_is_rejected(self):
        with self.assertRaisesRegex(RuntimeError, "must not include"):
            parse_endpoint_list(
                "npm",
                "http://192.168.1.3:81",
                81,
            )


class AppConfigPolicyTests(unittest.TestCase):
    def test_explicit_dns_target_is_used(self):
        with patch.dict(
            os.environ,
            {
                "DNS_TARGET_IP": "192.168.1.101",
                "NPM_ENDPOINTS": "192.168.1.3,192.168.1.4",
            },
            clear=True,
        ):
            config = AppConfig.from_env()

        self.assertEqual(
            config.target_ip,
            "192.168.1.101",
        )

    def test_legacy_proxy_ip_remains_target_fallback(self):
        with patch.dict(
            os.environ,
            {
                "PROXY_IP": "192.168.1.101",
            },
            clear=True,
        ):
            config = AppConfig.from_env()

        self.assertEqual(
            config.target_ip,
            "192.168.1.101",
        )

    def test_dns_target_is_required_without_legacy_fallback(self):
        with patch.dict(
            os.environ,
            {
                "NPM_ENDPOINTS": "192.168.1.3",
            },
            clear=True,
        ):
            with self.assertRaisesRegex(
                RuntimeError,
                "DNS_TARGET_IP is required",
            ):
                AppConfig.from_env()


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