"""
Visualization helpers for LingBot-Map.

This package is imported by the Space only for GLB export. Keep imports lazy so
optional viewer dependencies like `viser` do not become hard runtime
requirements for the ZeroGPU Gradio app.
"""

from importlib import import_module

__all__ = [
    "PointCloudViewer",
    "viser_wrapper",
    "predictions_to_glb",
    "CameraState",
    "colorize",
    "colorize_np",
    "get_vertical_colorbar",
    "apply_sky_segmentation",
    "segment_sky",
    "download_skyseg_model",
    "load_or_create_sky_masks",
]


def __getattr__(name):
    if name == "predictions_to_glb":
        return import_module("lingbot_map.vis.glb_export").predictions_to_glb

    if name in {"apply_sky_segmentation", "segment_sky", "download_skyseg_model", "load_or_create_sky_masks"}:
        return getattr(import_module("lingbot_map.vis.sky_segmentation"), name)

    if name in {"CameraState", "colorize", "colorize_np", "get_vertical_colorbar"}:
        return getattr(import_module("lingbot_map.vis.utils"), name)

    if name in {"PointCloudViewer", "viser_wrapper"}:
        try:
            module_name = "lingbot_map.vis.point_cloud_viewer" if name == "PointCloudViewer" else "lingbot_map.vis.viser_wrapper"
            return getattr(import_module(module_name), name)
        except ModuleNotFoundError as exc:
            if exc.name == "viser":
                raise ModuleNotFoundError(
                    "`viser` is not installed. The Hugging Face Space uses GLB preview instead of the live Viser viewer."
                ) from exc
            raise

    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")