#!/usr/bin/env python3
"""Measure mesh files for geometry fingerprints (duplicate detection).

Usage: fingerprint.py <file> [<file> ...]
Prints one JSON line per file: {path, fp: {faces, area, volume, extents}} or {path, error}.
Multi-object files (e.g. 3MF projects) are measured as one combined mesh.
"""
import sys
import json

import trimesh

import threemf_stream


def measure(path):
    if path.lower().endswith(".3mf"):
        # Leave out negative/modifier/support parts, so a project matches the
        # model it prints (e.g. its STL export).
        meshes, placements = threemf_stream.load(path)
        placements = threemf_stream.printable(threemf_stream.read_project(path), placements)
        stats = threemf_stream.measure(meshes, placements)
        if not stats["faces"]:
            raise ValueError("no geometry found")
        return stats

    mesh = trimesh.load(path, force="mesh")
    if mesh is None or len(mesh.faces) == 0:
        raise ValueError("no geometry found")
    try:
        volume = abs(float(mesh.volume))
    except Exception:
        volume = 0.0
    return {
        "faces": int(len(mesh.faces)),
        "area": float(mesh.area),
        "volume": volume,
        "extents": [float(x) for x in mesh.extents],
    }


def main():
    for path in sys.argv[1:]:
        try:
            out = {"path": path, "fp": measure(path)}
        except Exception as exc:
            out = {"path": path, "error": str(exc)[:200]}
        print(json.dumps(out), flush=True)
    return 0


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