"""Tests for app.config module."""

from __future__ import annotations

import pytest

from app.config import Settings


@pytest.mark.unit
class TestSettings:
    def test_default_values(self) -> None:
        settings = Settings(
            database_url="postgresql://x:x@localhost/db",
            anthropic_api_key="key",
        )
        assert settings.llm_provider == "anthropic"
        assert settings.llm_model == "claude-sonnet-4-6"
        assert settings.session_ttl_minutes == 30
        assert settings.interrupt_ttl_minutes == 30

    def test_custom_values(self) -> None:
        settings = Settings(
            database_url="postgresql://x:x@localhost/db",
            llm_provider="openai",
            llm_model="gpt-4o",
            session_ttl_minutes=15,
            openai_api_key="sk-test",
        )
        assert settings.llm_provider == "openai"
        assert settings.llm_model == "gpt-4o"
        assert settings.session_ttl_minutes == 15

    def test_invalid_provider_rejected(self) -> None:
        with pytest.raises(Exception):
            Settings(
                database_url="postgresql://x:x@localhost/db",
                llm_provider="invalid",
            )

    def test_missing_database_url_rejected(self) -> None:
        with pytest.raises(Exception):
            Settings(anthropic_api_key="key")

    def test_empty_api_key_for_provider_rejected(self) -> None:
        with pytest.raises(ValueError, match="API key"):
            Settings(
                database_url="postgresql://x:x@localhost/db",
                llm_provider="anthropic",
                anthropic_api_key="",
            )

    def test_wrong_provider_key_rejected(self) -> None:
        with pytest.raises(ValueError, match="API key"):
            Settings(
                database_url="postgresql://x:x@localhost/db",
                llm_provider="openai",
                anthropic_api_key="key",
                openai_api_key="",
            )