"""Factory test: load_backend dispatches on config.backend.type."""

from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path

import pytest

from ci_orchestrator.backends import load_backend
from ci_orchestrator.backends.workstation import WorkstationVmrunBackend


@dataclass
class _BE:
    type: str


@dataclass
class _Cfg:
    backend: _BE
    vmrun_path: str | None = None


def test_load_backend_returns_workstation(tmp_path: Path) -> None:
    fake = tmp_path / "vmrun.exe"
    fake.write_bytes(b"")
    backend = load_backend(_Cfg(backend=_BE("workstation"), vmrun_path=str(fake)))
    assert isinstance(backend, WorkstationVmrunBackend)


def test_load_backend_rejects_unknown(tmp_path: Path) -> None:
    fake = tmp_path / "vmrun.exe"
    fake.write_bytes(b"")
    with pytest.raises(NotImplementedError):
        load_backend(_Cfg(backend=_BE("esxi"), vmrun_path=str(fake)))