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from __future__ import annotations

import pytest
import collections.abc

from sain.maybe_uninit import MaybeUninit


@pytest.fixture()
def uninit() -> MaybeUninit[None]:
    return MaybeUninit()


class TestMaybeUninit:
    @pytest.fixture()
    def uninit_array(self) -> collections.abc.Sequence[MaybeUninit[None]]:
        return MaybeUninit[None].uninit_array(3)

    def test_uninit_array_basic(self, uninit_array: list[MaybeUninit[None]]) -> None:
        assert len(uninit_array) == 3 and all(not _ for _ in uninit_array)

    def test_uninit_array_write(
        self, uninit_array: tuple[MaybeUninit[None], ...]
    ) -> None:
        for uninit in uninit_array:
            uninit.write(None)

        assert all(uninit.assume_init() is None for uninit in uninit_array)

    def test_uninit_is_uninitialized(self, uninit: MaybeUninit[None]) -> None:
        with pytest.raises(AttributeError):
            uninit.assume_init()

    def test_write(self, uninit: MaybeUninit[None]) -> None:
        uninit.write(None)
        assert uninit.assume_init() is None

    def test___bool__False(self, uninit: MaybeUninit[None]) -> None:
        assert not uninit

    def test___bool_True(self, uninit: MaybeUninit[None]) -> None:
        uninit.write(None)
        assert bool(uninit)

    def test___repr___when_initialized(self, uninit: MaybeUninit[None]) -> None:
        uninit.write(None)
        assert repr(uninit) == "MaybeUninit(value: None)"

    def test___repr___when_uninitialized(self, uninit: MaybeUninit[None]) -> None:
        assert repr(uninit) == "<uninit>"
