import pandas as pd
import pytest

from backend.ml_module.services.storage_service import MLStorageService


@pytest.fixture
def storage_service(monkeypatch):
    monkeypatch.setattr(MLStorageService, "_initialize_client", lambda self: None)
    return MLStorageService()


def test_load_dataframe_by_asset_reference_uses_canonical_asset_path(storage_service, monkeypatch):
    expected_df = pd.DataFrame({"a": [1], "b": [2]})
    calls = {}

    def _fake_load_dataframe(path: str, chunksize=None):
        calls["path"] = path
        calls["chunksize"] = chunksize
        return expected_df

    monkeypatch.setattr(storage_service, "load_dataframe", _fake_load_dataframe)

    result = storage_service.load_dataframe_by_asset_reference(
        tenant_id="tenant_abc",
        asset_id="asset_xyz",
        version=2,
        filename="train.parquet",
        chunksize=None,
    )

    assert calls["path"] == "tenant_abc/files/asset_xyz/2/train.parquet"
    assert result.equals(expected_df)


def test_load_dataframe_by_asset_reference_rejects_invalid_filename(storage_service):
    with pytest.raises(ValueError):
        storage_service.load_dataframe_by_asset_reference(
            tenant_id="tenant_abc",
            asset_id="asset_xyz",
            version=1,
            filename="../escape.csv",
        )