import numpy as np
import pytest

import xgboost as xgb

dt = pytest.importorskip("datatable")
pd = pytest.importorskip("pandas")


class TestDataTable:
    def test_dt(self) -> None:
        df = pd.DataFrame([[1, 2.0, True], [2, 3.0, False]], columns=["a", "b", "c"])
        dtable = dt.Frame(df)
        labels = dt.Frame([1, 2])
        dm = xgb.DMatrix(dtable, label=labels)
        assert dm.feature_names == ["a", "b", "c"]
        assert dm.feature_types == ["int", "float", "i"]
        assert dm.num_row() == 2
        assert dm.num_col() == 3

        np.testing.assert_array_equal(np.array([1, 2]), dm.get_label())

        # overwrite feature_names
        dm = xgb.DMatrix(dtable, label=pd.Series([1, 2]), feature_names=["x", "y", "z"])
        assert dm.feature_names == ["x", "y", "z"]
        assert dm.num_row() == 2
        assert dm.num_col() == 3

        # incorrect dtypes
        df = pd.DataFrame([[1, 2.0, "x"], [2, 3.0, "y"]], columns=["a", "b", "c"])
        dtable = dt.Frame(df)
        with pytest.raises(ValueError):
            xgb.DMatrix(dtable)

        df = pd.DataFrame({"A=1": [1, 2, 3], "A=2": [4, 5, 6]})
        dtable = dt.Frame(df)
        dm = xgb.DMatrix(dtable)
        assert dm.feature_names == ["A=1", "A=2"]
        assert dm.feature_types == ["int", "int"]
        assert dm.num_row() == 3
        assert dm.num_col() == 2