#!/usr/bin/env python3
"""Convert a 3MF (incl. Bambu/MakerWorld production-extension files) to GLB.

Usage: convert_3mf.py <input.3mf> <output.glb>
Prints a JSON summary {glb, volume_cm3, bbox, faces} to stdout.
"""
import sys
import json
import trimesh


def main():
    if len(sys.argv) != 3:
        print(json.dumps({"error": "usage: convert_3mf.py <in.3mf> <out.glb>"}))
        return 2

    in_path, out_path = sys.argv[1], sys.argv[2]
    scene = trimesh.load(in_path, force="scene")
    geoms = list(scene.geometry.values())
    if not geoms:
        print(json.dumps({"error": "no geometry found in 3MF"}))
        return 1

    scene.export(out_path, file_type="glb")

    combined = trimesh.util.concatenate(geoms)
    ext = combined.bounds[1] - combined.bounds[0]
    summary = {
        "glb": out_path,
        "bbox": {"x": round(float(ext[0]), 3), "y": round(float(ext[1]), 3), "z": round(float(ext[2]), 3)},
        "faces": int(sum(len(g.faces) for g in geoms)),
    }
    try:
        # trimesh volume is in model units (mm) -> cm^3 to match the rest of the app
        summary["volume_cm3"] = round(float(combined.volume) / 1000.0, 3)
    except Exception:
        summary["volume_cm3"] = None

    print(json.dumps(summary))
    return 0


if __name__ == "__main__":
    sys.exit(main())