"""Regression tests for the application's timestamp convention."""

import ast
from datetime import UTC, datetime
from pathlib import Path

from app.time_utils import utc_now_naive


def test_utc_now_naive_is_an_explicit_utc_value():
    before = datetime.now(UTC).replace(tzinfo=None)
    actual = utc_now_naive()
    after = datetime.now(UTC).replace(tzinfo=None)

    assert actual.tzinfo is None
    assert before <= actual <= after


def test_application_does_not_call_deprecated_utcnow():
    app_root = Path(__file__).parents[1] / 'app'
    offenders = []

    for path in app_root.rglob('*.py'):
        tree = ast.parse(path.read_text(encoding='utf-8'), filename=str(path))
        for node in ast.walk(tree):
            if isinstance(node, ast.Attribute) and node.attr == 'utcnow':
                offenders.append(f'{path.relative_to(app_root)}:{node.lineno}')

    assert offenders == []