import os

import pytest

from experiments import launch


def test_cpu_override(monkeypatch):
    monkeypatch.setenv("VSI_CPU_WORKERS", "7")
    assert launch.available_cpu_count() == 7


def test_invalid_cpu_override(monkeypatch):
    monkeypatch.setenv("VSI_CPU_WORKERS", "0")
    with pytest.raises(ValueError):
        launch.available_cpu_count()


def test_thread_budget_sets_all_numerical_controls(monkeypatch):
    for name in (
        "OMP_NUM_THREADS",
        "MKL_NUM_THREADS",
        "OPENBLAS_NUM_THREADS",
        "NUMEXPR_NUM_THREADS",
        "VSI_KD_WORKERS",
    ):
        monkeypatch.delenv(name, raising=False)
    launch.configure_numerical_threads(3)
    assert os.environ["VSI_KD_WORKERS"] == "3"
    assert os.environ["OMP_NUM_THREADS"] == "3"


def test_empty_batch_does_not_spawn_workers():
    assert launch.launch({}, [], workers=0) == {"built": 0, "loaded": 0, "failed": 0}