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"""Test pymovements.gaze.transforms.norm."""
import polars as pl
import pytest
from polars.testing import assert_series_equal

import pymovements as pm


@pytest.mark.parametrize(
    ('columns', 'df', 'expected_series'),
    [
        pytest.param(
            ('x', 'y'),
            pl.DataFrame([
                pl.Series('x', [], pl.Float64),
                pl.Series('y', [], pl.Float64),
            ]),
            pl.Series(None, [], pl.Float64),
            id='empty_series_returns_empty_series',
        ),
        pytest.param(
            ('x', 'y'),
            pl.DataFrame([
                pl.Series('x', [1], pl.Float64),
                pl.Series('y', [1], pl.Float64),
            ]),
            pl.Series(None, [1.41421356], pl.Float64),
            id='empty_series_returns_empty_series',
        ),
        pytest.param(
            ('x', 'y'),
            pl.DataFrame([
                pl.Series('x', [1, 1], pl.Float64),
                pl.Series('y', [1, 1], pl.Float64),
            ]),
            pl.Series(None, [1.4142, 1.4142], pl.Float64),
            id='empty_series_returns_empty_series',
        ),
    ],
)
def test_norm_returns(columns, df, expected_series):
    result_df = df.select(
        pm.gaze.transforms.norm(columns=columns).alias('norm'),
    )
    assert_series_equal(result_df['norm'], expected_series, check_names=False)
