from __future__ import annotations

import importlib.util
import os
from pathlib import Path

import pytest


REPO_ROOT = Path(__file__).resolve().parents[1]
BACKEND_MAIN = REPO_ROOT / "ansible/roles/cezen-backend/files/main.py"


@pytest.fixture
def isolated_appliance(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> dict[str, Path]:
    """Return isolated appliance paths and never touch /opt/cezen."""
    data = tmp_path / "data"
    backups = tmp_path / "backups"
    data.mkdir()
    backups.mkdir()
    monkeypatch.setenv("CEZEN_DATA", str(data))
    monkeypatch.setenv("CEZEN_BACKUP_DIR", str(backups))
    monkeypatch.setenv("CEZEN_LICENSE_JSON", str(tmp_path / "license.json"))
    return {"root": tmp_path, "data": data, "backups": backups}


def load_backend_module(module_name: str = "cezen_backend_test"):
    """Load the packaged backend only after fixtures set environment variables."""
    spec = importlib.util.spec_from_file_location(module_name, BACKEND_MAIN)
    if spec is None or spec.loader is None:
        raise RuntimeError(f"Cannot load backend from {BACKEND_MAIN}")
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)
    return module