"""Test für src.config — Pydantic-Settings Konfiguration."""

from __future__ import annotations

import os
from unittest.mock import patch

import pytest

from src.config import Settings, settings


class TestSettings:
    """Tests für die zentrale Settings-Klasse."""

    @patch.dict(os.environ, {"REDIS_HOST": "redis.example.com", "REDIS_PORT": "6380"})
    def test_settings_liest_env_vars(self) -> None:
        class EnvSettings(Settings):
            model_config = {"env_file": None}

        env = EnvSettings()
        assert env.REDIS_HOST == "redis.example.com"
        assert env.REDIS_PORT == 6380

    def test_settings_standardwerte(self) -> None:
        """Standardwerte ohne Umgebungsvariablen."""

        class EnvSettings(Settings):
            model_config = {"env_file": None}

        env = EnvSettings()
        assert env.REDIS_HOST == "localhost"
        assert env.REDIS_PORT == 6379
        assert env.APP_HOST == "0.0.0.0"
        assert env.APP_PORT == 5002
        assert env.APP_DEBUG is False

    def test_settings_falsches_redis_port_wirft(self) -> None:
        """Ungültiger Port-Typ wirft ValidationError."""
        with pytest.raises(Exception):  # type: ignore[misc]
            with patch.dict(os.environ, {"REDIS_PORT": "nicht_zahl"}, clear=True):
                Settings._build_customise_schema()
                Settings.model_rebuild(force=True)
                env = Settings(model_config={"env_file": None})
                _ = env.REDIS_PORT  # noqa: B018

    def test_settings_globale_instance(self) -> None:
        """globale settings-Instanz ist vom Typ Settings."""
        assert isinstance(settings, Settings)
        assert settings.REDIS_HOST == "localhost"
        assert settings.APP_PORT == 5002