from pathlib import Path

import pytest

from common_cents import config


@pytest.fixture(autouse=True)
def isolate_config(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Path:
    """Point XDG_CONFIG_HOME at a temp dir so tests don't touch the real config."""
    monkeypatch.setenv("XDG_CONFIG_HOME", str(tmp_path))
    return tmp_path


def test_config_path_uses_xdg(isolate_config: Path) -> None:
    assert config.config_path() == isolate_config / "common-cents" / "config.json"


def test_load_returns_empty_when_missing() -> None:
    assert config.load_config() == {}


def test_load_returns_empty_on_corrupt_json(isolate_config: Path) -> None:
    p = config.config_path()
    p.parent.mkdir(parents=True)
    p.write_text("{not valid json")
    assert config.load_config() == {}


def test_set_and_get_active_db_path(tmp_path: Path) -> None:
    target = tmp_path / "elsewhere" / "my.db"
    config.set_active_db_path(target)
    assert config.get_active_db_path() == target


def test_get_active_db_path_returns_none_when_unset() -> None:
    assert config.get_active_db_path() is None


def test_clear_active_db_path(tmp_path: Path) -> None:
    target = tmp_path / "x.db"
    config.set_active_db_path(target)
    config.clear_active_db_path()
    assert config.get_active_db_path() is None


def test_clear_when_unset_is_noop() -> None:
    config.clear_active_db_path()
    assert config.get_active_db_path() is None


def test_set_preserves_other_keys() -> None:
    config.save_config({"theme": "dark"})
    config.set_active_db_path(Path("/tmp/x.db"))
    data = config.load_config()
    assert data["theme"] == "dark"
    assert data["db_path"] == "/tmp/x.db"