# ABOUTME: Tests for the constants module.
# ABOUTME: Validates sentinel values used throughout the application.

import datetime


class TestEndOfTimeUtc:
    """Test the END_OF_TIME_UTC sentinel constant."""

    def test_end_of_time_value(self):
        """END_OF_TIME_UTC should equal 32503680000000 (ms epoch for year 3000)."""
        from animaltrack.constants import END_OF_TIME_UTC

        assert END_OF_TIME_UTC == 32503680000000

    def test_end_of_time_represents_year_3000(self):
        """END_OF_TIME_UTC should represent January 1, 3000 00:00:00 UTC."""
        from animaltrack.constants import END_OF_TIME_UTC

        # Convert ms to seconds for datetime
        dt = datetime.datetime.fromtimestamp(END_OF_TIME_UTC / 1000, tz=datetime.UTC)
        assert dt.year == 3000
        assert dt.month == 1
        assert dt.day == 1
        assert dt.hour == 0
        assert dt.minute == 0
        assert dt.second == 0

    def test_end_of_time_is_integer(self):
        """END_OF_TIME_UTC should be an integer (ms precision)."""
        from animaltrack.constants import END_OF_TIME_UTC

        assert isinstance(END_OF_TIME_UTC, int)