"""Round-trip / migrate / sanitize tests for config.Settings."""
from __future__ import annotations

import json
import unittest
from dataclasses import asdict
from pathlib import Path
from tempfile import TemporaryDirectory
from unittest.mock import patch

from proxy_chain_manager import config


class TestSanitize(unittest.TestCase):
    def test_clamps_chain_length(self) -> None:
        s = config.Settings()
        s.chain_length = 99
        s, changed = config.sanitize_settings(s)
        self.assertTrue(changed)
        self.assertEqual(s.chain_length, 8)

    def test_chain_length_string_resets_to_default(self) -> None:
        s = config.Settings()
        s.chain_length = "not a number"  # type: ignore[assignment]
        s, changed = config.sanitize_settings(s)
        self.assertTrue(changed)
        self.assertEqual(s.chain_length, 3)

    def test_local_port_clamped(self) -> None:
        s = config.Settings()
        s.local_port = 99999
        s, changed = config.sanitize_settings(s)
        self.assertTrue(changed)
        self.assertLessEqual(s.local_port, 65535)

    def test_http_source_url_rejected(self) -> None:
        # _is_safe_https_url should strip plaintext HTTP sources.
        s = config.Settings()
        s.sources = ["http://insecure.example/list.json"]
        s, _ = config.sanitize_settings(s)
        self.assertTrue(all(u.startswith("https://") for u in s.sources))

    def test_rfc1918_source_url_rejected(self) -> None:
        s = config.Settings()
        s.sources = [
            "https://192.168.1.1/list.json",
            "https://cdn.jsdelivr.net/gh/proxifly/free-proxy-list@main/proxies/protocols/http/data.json",
        ]
        s, _ = config.sanitize_settings(s)
        for u in s.sources:
            # rfc1918 host must be gone.
            self.assertNotIn("192.168.", u)


class TestMigrate(unittest.TestCase):
    def test_unversioned_dict_gets_versioned(self) -> None:
        raw = {"chain_length": 4}
        out = config.migrate(raw)
        self.assertEqual(out["settings_version"], config.SETTINGS_SCHEMA_VERSION)
        self.assertEqual(out["chain_length"], 4)

    def test_already_current_passthrough(self) -> None:
        raw = {"settings_version": config.SETTINGS_SCHEMA_VERSION, "chain_length": 4}
        out = config.migrate(raw)
        self.assertEqual(out["settings_version"], config.SETTINGS_SCHEMA_VERSION)


class TestLoadSaveRoundTrip(unittest.TestCase):
    def test_save_then_load_preserves_values(self) -> None:
        with TemporaryDirectory() as tmp:
            tmp_path = Path(tmp)
            with patch.object(config, "app_data_dir", return_value=tmp_path):
                s = config.Settings()
                s.chain_length = 5
                s.local_port = 19191
                s.kill_switch_enabled = False
                config.save_settings(s)
                loaded = config.load_settings()
                self.assertEqual(loaded.chain_length, 5)
                self.assertEqual(loaded.local_port, 19191)
                self.assertFalse(loaded.kill_switch_enabled)

    def test_corrupt_settings_backed_up_and_defaults_returned(self) -> None:
        with TemporaryDirectory() as tmp:
            tmp_path = Path(tmp)
            (tmp_path / "settings.json").write_text("{ not json", encoding="utf-8")
            with patch.object(config, "app_data_dir", return_value=tmp_path):
                loaded = config.load_settings()
                self.assertEqual(loaded.chain_length, config.Settings().chain_length)
                self.assertTrue((tmp_path / "settings.json.corrupt").is_file())

    def test_save_writes_backup_before_overwriting(self) -> None:
        with TemporaryDirectory() as tmp:
            tmp_path = Path(tmp)
            with patch.object(config, "app_data_dir", return_value=tmp_path):
                config.save_settings(config.Settings())
                # Mutate + save again — .bak should now exist.
                s = config.load_settings()
                s.chain_length = 7
                config.save_settings(s)
                self.assertTrue((tmp_path / "settings.json.bak").is_file())


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