"""Smoke tests for config loader (src/config.py). Needs python-dotenv only."""

from src.config import load_config

_KEYS = [
    "LOCAL_RTSP", "JETSON_RTSP", "MODEL_SACK_PATH", "MODEL_TRUCK_PATH",
    "COUNTING_LINE_Y", "COUNTING_LINE_X_START", "COUNTING_LINE_X_END",
    "SACK_CONF_THRESHOLD", "TRUCK_CONF_THRESHOLD", "BATCH_TIMEOUT_SECONDS",
    "CSV_OUTPUT_DIR", "DATA_SEED",
]


def test_load_from_env_file(tmp_path, monkeypatch):
    for k in _KEYS:
        monkeypatch.delenv(k, raising=False)
    env = tmp_path / "test.env"
    env.write_text(
        "LOCAL_RTSP=rtsp://cam/1\n"
        "MODEL_SACK_PATH=/m/sack.pt\n"
        "MODEL_TRUCK_PATH=/m/truck.pt\n"
        "SACK_CONF_THRESHOLD=0.55\n"
    )
    cfg = load_config(str(env))
    assert cfg.local_rtsp == "rtsp://cam/1"
    assert cfg.sack_model_path == "/m/sack.pt"
    assert cfg.truck_model_path == "/m/truck.pt"
    assert cfg.sack_conf == 0.55
    assert cfg.truck_conf == 0.50  # default preserved