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from base64 import b64decode

import pytest

from servicex.python_dataset import PythonFunction


def test_no_provided_function():
    datasource = PythonFunction()

    with pytest.raises(ValueError):
        print(datasource.generate_selection_string())


def test_generate_transform():
    datasource = PythonFunction()

    def run_query(input_filenames=None):
        print("Greetings from your query")
        return []

    selection = datasource.with_uproot_function(run_query).generate_selection_string()
    print(selection)
    print("==============")
    print(b64decode(selection))


def test_function_as_string():
    datasource = PythonFunction()

    string_function = """
        def run_query(input_filenames=None):
            print("Greetings from your query")
            return []
    """
    selection = datasource.with_uproot_function(
        string_function
    ).generate_selection_string()
    print(selection)
    print("==============")
    print(b64decode(selection))
