"""Tests for events_yaml functionality."""

from datetime import date, datetime, time

from agenda.events_yaml import midnight


class TestMidnight:
    """Test the midnight function."""

    def test_midnight_with_date(self) -> None:
        """Test converting date to midnight datetime."""
        test_date = date(2024, 6, 15)
        result = midnight(test_date)
        
        assert isinstance(result, datetime)
        assert result.date() == test_date
        assert result.time() == time(0, 0, 0)  # Midnight
        assert result == datetime(2024, 6, 15, 0, 0, 0)

    def test_midnight_different_dates(self) -> None:
        """Test midnight function with different dates."""
        test_cases = [
            date(2024, 1, 1),    # New Year's Day
            date(2024, 12, 31),  # New Year's Eve
            date(2024, 2, 29),   # Leap day
            date(2024, 7, 4),    # Independence Day
        ]
        
        for test_date in test_cases:
            result = midnight(test_date)
            assert result.date() == test_date
            assert result.time() == time(0, 0, 0)
            assert result.hour == 0
            assert result.minute == 0
            assert result.second == 0
            assert result.microsecond == 0

    def test_midnight_preserves_year_month_day(self) -> None:
        """Test that midnight preserves the year, month, and day."""
        test_date = date(2023, 11, 27)
        result = midnight(test_date)
        
        assert result.year == 2023
        assert result.month == 11
        assert result.day == 27
        assert result.hour == 0
        assert result.minute == 0
        assert result.second == 0