"""core 包测试。

TODO(L0)：实现后去掉 skip 标记。
"""

from __future__ import annotations

import numpy as np
import pytest


@pytest.mark.skip(reason="未实现：见 docs/03-roadmap.md L0")
class TestRandom:
    def test_get_rng_is_reproducible(self):
        from mcm_toolkit.core import get_rng

        assert get_rng(42).random() == get_rng(42).random()

    def test_get_rng_passes_through_generator(self):
        from mcm_toolkit.core import get_rng

        g = np.random.default_rng(0)
        assert get_rng(g) is g

    def test_set_seed_makes_global_reproducible(self):
        from mcm_toolkit.core import set_seed

        set_seed(7)
        a = np.random.default_rng(7).random()
        set_seed(7)
        b = np.random.default_rng(7).random()
        assert a == b


@pytest.mark.skip(reason="未实现：见 docs/03-roadmap.md L0")
class TestValidate:
    def test_check_same_length_raises_with_detail(self):
        from mcm_toolkit.core import check_same_length

        with pytest.raises(ValueError, match=r"2.*3|长度"):
            check_same_length([1, 2], [1, 2, 3])

    def test_check_array_rejects_nan(self):
        from mcm_toolkit.core import check_array

        with pytest.raises(ValueError):
            check_array([1.0, np.nan, 2.0], finite=True)

    def test_check_probability_bounds(self):
        from mcm_toolkit.core import check_probability

        assert check_probability(0.5) == 0.5
        with pytest.raises(ValueError):
            check_probability(1.5)

    def test_check_square_matrix(self):
        from mcm_toolkit.core import check_square_matrix

        check_square_matrix([[1, 2], [3, 4]])
        with pytest.raises(ValueError):
            check_square_matrix([[1, 2, 3], [4, 5, 6]])


@pytest.mark.skip(reason="未实现：见 docs/03-roadmap.md L0")
def test_result_repr_is_readable():
    from mcm_toolkit.core import Result

    text = repr(Result("demo", params={"a": 1}, metrics={"r2": 0.9}))
    assert "demo" in text and "r2" in text