import csv
from pathlib import Path

from composer_ans.experiments import run_parameter_sweep


THES = Path(__file__).resolve().parents[1] / "THES"


def test_run_parameter_sweep_writes_reports_and_summary(tmp_path: Path) -> None:
    reports = run_parameter_sweep(
        thes_root=THES,
        output_dir=tmp_path,
        notes=2,
        parameter_sets=[
            {"object_threshold": 2, "art_vigilance": 0.85},
            {"object_threshold": 3, "art_vigilance": 0.9},
        ],
    )

    assert len(reports) == 2
    assert (tmp_path / "run_001.json").exists()
    assert (tmp_path / "run_002.json").exists()
    assert (tmp_path / "summary.csv").exists()

    with (tmp_path / "summary.csv").open("r", encoding="utf-8", newline="") as handle:
        rows = list(csv.DictReader(handle))
    assert len(rows) == 2