from datetime import date, datetime

import pytest

from app.utils.bx_codegen import parse_optional_date


def test_parse_optional_date_none_and_blank():
    assert parse_optional_date(None) is None
    assert parse_optional_date("") is None
    assert parse_optional_date("   ") is None


def test_parse_optional_date_string_and_date():
    assert parse_optional_date("2026-08-17") == date(2026, 8, 17)
    assert parse_optional_date(date(2026, 1, 2)) == date(2026, 1, 2)
    assert parse_optional_date(datetime(2026, 3, 4, 12, 0, 0)) == date(2026, 3, 4)


def test_parse_optional_date_invalid():
    with pytest.raises(ValueError):
        parse_optional_date("2026/08/17")