from pathlib import Path

import pytest

from agr_assistent.config import ConfigError, load_config


def _write(path: Path, text: str) -> Path:
    path.write_text(text, encoding="utf-8")
    return path


def test_creates_default_config_when_missing(tmp_path: Path) -> None:
    path = tmp_path / "config.yaml"

    config = load_config(path)

    assert path.exists()
    assert config.llm.provider == "ollama"
    assert config.llm.active_provider.base_url == "http://localhost:11434/v1"


def test_user_values_override_defaults(tmp_path: Path) -> None:
    path = _write(
        tmp_path / "config.yaml",
        "llm:\n  provider: openrouter\n  providers:\n    openrouter:\n      model: my/model\n",
    )

    config = load_config(path)

    assert config.llm.active_provider.model == "my/model"
    assert config.llm.active_provider.base_url == "https://openrouter.ai/api/v1"
    assert config.llm.temperature == 0.7


def test_api_key_expands_environment_variable(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    path = _write(
        tmp_path / "config.yaml",
        "llm:\n  providers:\n    openrouter:\n      api_key: ${TEST_AGR_KEY}\n",
    )

    monkeypatch.setenv("TEST_AGR_KEY", "secret")
    assert load_config(path).llm.providers["openrouter"].api_key == "secret"

    monkeypatch.delenv("TEST_AGR_KEY")
    assert load_config(path).llm.providers["openrouter"].api_key == ""


def test_unknown_provider_is_rejected(tmp_path: Path) -> None:
    path = _write(tmp_path / "config.yaml", "llm:\n  provider: nope\n")

    with pytest.raises(ConfigError, match="nope"):
        load_config(path)


def test_invalid_yaml_is_rejected(tmp_path: Path) -> None:
    path = _write(tmp_path / "config.yaml", "llm: [unclosed\n")

    with pytest.raises(ConfigError):
        load_config(path)