"""Probe STL normal/unit/edge behavior in pinned Blender 5.2 for M12-07E."""

import hashlib
import json
import sys
from pathlib import Path

import bpy


def sha256_file(path):
    digest = hashlib.sha256()
    with open(path, "rb") as handle:
        for chunk in iter(lambda: handle.read(1024 * 1024), b""):
            digest.update(chunk)
    return digest.hexdigest()


def import_case(path, global_scale):
    bpy.ops.wm.read_factory_settings(use_empty=True)
    result = bpy.ops.wm.stl_import(
        filepath=str(path),
        directory=str(path.parent),
        forward_axis="NEGATIVE_Z",
        up_axis="Y",
        global_scale=global_scale,
        use_scene_unit=False,
        use_facet_normal=True,
        use_mesh_validate=True,
    )
    objects = [obj for obj in bpy.context.scene.objects if obj.type == "MESH"]
    if "FINISHED" not in result or not objects:
        return {"status": "BLOCKED", "objectCount": len(objects)}
    mesh = objects[0].data
    mesh.calc_loop_triangles()
    coordinates = [[float(value) for value in (objects[0].matrix_world @ vertex.co)] for vertex in mesh.vertices]
    bounds = {
        "min": [min(values) for values in zip(*coordinates)],
        "max": [max(values) for values in zip(*coordinates)],
    } if coordinates else {"min": [0.0, 0.0, 0.0], "max": [0.0, 0.0, 0.0]}
    return {
        "status": "ACCEPTED",
        "objectCount": len(objects),
        "vertexCount": len(mesh.vertices),
        "polygonCount": len(mesh.polygons),
        "triangleCount": len(mesh.loop_triangles),
        "bounds": bounds,
        "polygonNormals": [[float(value) for value in polygon.normal] for polygon in mesh.polygons],
    }


def main(fixture_root, report_path):
    fixture_root = Path(fixture_root).resolve()
    report_path = Path(report_path).resolve()
    cases = []
    for case_id, name, scale in (
        ("BINARY_UNIT_1", "capability-binary.stl", 1.0),
        ("BINARY_UNIT_001", "capability-binary.stl", 0.001),
        ("DEGENERATE_TRIANGLE", "degenerate-binary.stl", 1.0),
        ("TRAILING_BYTES", "trailing-binary.stl", 1.0),
    ):
        path = fixture_root / name
        cases.append({"id": case_id, "file": name, "globalScale": scale, "byteLength": path.stat().st_size, "sha256": sha256_file(path), "result": import_case(path, scale)})
    report = {"schemaVersion": 1, "task": "M12-07E", "operation": "BLENDER_STL_EDGE_PROBE", "cases": cases, "nextTask": "M12-07F"}
    report_path.parent.mkdir(parents=True, exist_ok=True)
    report_path.write_text(json.dumps(report, indent=2, sort_keys=True) + "\n", encoding="utf-8")
    print("stl-edge-probe-complete cases=%s next=%s" % (len(cases), report["nextTask"]))


if __name__ == "__main__":
    args = sys.argv[sys.argv.index("--") + 1 :] if "--" in sys.argv else []
    if len(args) != 2:
        raise SystemExit("usage: blender --background --python probe-stl-edge-fixtures.py -- FIXTURE_ROOT REPORT")
    main(args[0], args[1])