import pytest
from data.downloader import download_daily


def test_download_single_stock():
    """Smoke test: download data for 浦发银行 for a short window."""
    df = download_daily("sh600000", "2024-01-01", "2024-01-31")
    assert df is not None
    assert len(df) > 0
    assert list(df.columns) == ["symbol", "date", "open", "high", "low", "close", "volume", "amount"]
    assert df["close"].notna().all()


def test_download_baostock_primary():
    """baostock is the primary source for 'auto'."""
    df = download_daily("sz000001", "2024-06-01", "2024-06-15", source="baostock")
    assert df is not None
    assert len(df) > 0


def test_download_akshare_fallback():
    """akshare works as the secondary source when reachable.

    akshare is the fallback precisely because it is unreliable on some
    networks; skip rather than fail when it cannot be reached.
    """
    try:
        df = download_daily("sh600000", "2024-01-01", "2024-01-31", source="akshare")
    except RuntimeError as e:
        pytest.skip(f"akshare unreachable on this network: {e}")
    assert df is not None
    assert len(df) > 0