from shared.geo_geometry import Wgs84Coordinate, distance_m, local_to_wgs84, wgs84_to_local
from shared.time_sync import check_monotonic_timestamps, select_time_window


def test_wgs84_local_round_trip_is_deterministic() -> None:
    # Arrange
    origin = Wgs84Coordinate(latitude_deg=49.9808, longitude_deg=36.2527, altitude_m=120.0)
    point = Wgs84Coordinate(latitude_deg=49.9811, longitude_deg=36.2531, altitude_m=118.0)

    # Act
    local = wgs84_to_local(origin, point)
    round_trip = local_to_wgs84(origin, local)

    # Assert
    assert round(round_trip.latitude_deg, 7) == round(point.latitude_deg, 7)
    assert round(round_trip.longitude_deg, 7) == round(point.longitude_deg, 7)
    assert round(round_trip.altitude_m, 7) == round(point.altitude_m, 7)
    assert distance_m(origin, point) > 0.0


def test_non_monotonic_timestamps_return_explicit_violation() -> None:
    # Act
    violations = check_monotonic_timestamps([100, 200, 150])

    # Assert
    assert len(violations) == 1
    assert violations[0].category == "timestamp_mismatch"


def test_time_window_reports_gap_instead_of_dropping_silently() -> None:
    # Act
    result = select_time_window(
        frame_timestamp_ns=1_000,
        sample_timestamps_ns=[100, 200, 300],
        tolerance_ns=50,
    )

    # Assert
    assert result.ok is False
    assert result.sample_timestamps_ns == ()
    assert result.violations[0].category == "gap_exceeded"