"""TST-6: tests for ``loosecanvas.config`` — ALLOWED_BASE_DIR resolution.

``config.py`` resolves ``ALLOWED_BASE_DIR`` at **import time** from
``LOOSECANVAS_ALLOWED_BASE``.  These tests use ``monkeypatch.setenv`` /
``monkeypatch.delenv`` followed by ``importlib.reload`` so each test exercises
the real resolution path without mutating the process-wide value seen by other
modules.

Strict teardown: the fixture restores both the env var and the module after
each test so that downstream files (e.g. ``test_file_walker.py``) see the real
boundary if they run in the same process.
"""

from __future__ import annotations

import importlib
from collections.abc import Iterator
from pathlib import Path

import loosecanvas.config as _config_module
import pytest


@pytest.fixture
def _restore_config(monkeypatch: pytest.MonkeyPatch) -> Iterator[None]:
    """Reload ``loosecanvas.config`` after each test, restoring the original value."""
    original_allowed_base = _config_module.ALLOWED_BASE_DIR
    yield
    # Reload without any patched env — restores the import-time value.
    importlib.reload(_config_module)
    # Belt-and-suspenders: put the pre-test value back on the module object in
    # case other already-imported modules hold a reference.
    _config_module.ALLOWED_BASE_DIR = original_allowed_base


def test_env_set_uses_that_path(
    monkeypatch: pytest.MonkeyPatch,
    tmp_path: Path,
    _restore_config: None,
) -> None:
    """When LOOSECANVAS_ALLOWED_BASE is set, ALLOWED_BASE_DIR == Path(tmp).resolve()."""
    monkeypatch.setenv("LOOSECANVAS_ALLOWED_BASE", str(tmp_path))
    importlib.reload(_config_module)
    assert tmp_path.resolve() == _config_module.ALLOWED_BASE_DIR


def test_env_unset_uses_workspace_parent_default(
    monkeypatch: pytest.MonkeyPatch,
    _restore_config: None,
) -> None:
    """When LOOSECANVAS_ALLOWED_BASE is absent, ALLOWED_BASE_DIR defaults to _WORKSPACE_ROOT.parent."""
    monkeypatch.delenv("LOOSECANVAS_ALLOWED_BASE", raising=False)
    importlib.reload(_config_module)
    expected = _config_module._WORKSPACE_ROOT.parent.resolve()
    assert expected == _config_module.ALLOWED_BASE_DIR


def test_allowed_base_dir_is_absolute(_restore_config: None) -> None:
    """ALLOWED_BASE_DIR is always an absolute (resolved) path."""
    assert _config_module.ALLOWED_BASE_DIR.is_absolute()