"""
Geometry operations for RF propagation calculations.

NumPy-dependent modules (haversine, intersection, reflection) are
imported lazily so pure-Python modules (diffraction, los) remain
available even when NumPy is not installed.
"""

from app.geometry.diffraction import knife_edge_loss
from app.geometry.los import check_los_terrain, fresnel_radius


def __getattr__(name):
    """Lazy import for NumPy-dependent geometry functions."""
    _numpy_exports = {
        "haversine_distance", "haversine_batch", "points_to_local_coords",
        "line_segments_intersect_batch", "line_intersects_polygons_batch",
        "calculate_reflection_points_batch", "find_best_reflection_path",
    }
    if name in _numpy_exports:
        if name in ("haversine_distance", "haversine_batch", "points_to_local_coords"):
            from app.geometry.haversine import haversine_distance, haversine_batch, points_to_local_coords
            return locals()[name]
        elif name in ("line_segments_intersect_batch", "line_intersects_polygons_batch"):
            from app.geometry.intersection import line_segments_intersect_batch, line_intersects_polygons_batch
            return locals()[name]
        elif name in ("calculate_reflection_points_batch", "find_best_reflection_path"):
            from app.geometry.reflection import calculate_reflection_points_batch, find_best_reflection_path
            return locals()[name]
    raise AttributeError(f"module 'app.geometry' has no attribute {name!r}")


__all__ = [
    "haversine_distance", "haversine_batch", "points_to_local_coords",
    "line_segments_intersect_batch", "line_intersects_polygons_batch",
    "calculate_reflection_points_batch", "find_best_reflection_path",
    "knife_edge_loss", "check_los_terrain", "fresnel_radius",
]