#!/usr/bin/env python3
import hashlib
import json
import pathlib
import sys

import bpy


def state():
    body = bpy.data.objects.get("WBV2P4004RigidBody")
    floor = bpy.data.objects.get("WBV2P4004Collision")
    if body is None or floor is None or body.rigid_body is None or floor.rigid_body is None:
        raise RuntimeError("simulation fixture rigid-body data is missing")
    return {
        "body": {"name": body.name, "type": body.rigid_body.type, "shape": body.rigid_body.collision_shape, "mass": body.rigid_body.mass, "friction": body.rigid_body.friction, "restitution": body.rigid_body.restitution, "linearDamping": body.rigid_body.linear_damping, "angularDamping": body.rigid_body.angular_damping},
        "collision": {"name": floor.name, "type": floor.rigid_body.type, "shape": floor.rigid_body.collision_shape},
        "frame": [bpy.context.scene.frame_start, bpy.context.scene.frame_end, bpy.context.scene.frame_current],
    }


def main():
    arguments = sys.argv[sys.argv.index("--") + 1:]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --factory-startup --python check-wbv2-p4-004-desktop.py -- FIXTURE REPORT")
    fixture, report_path = (pathlib.Path(value).resolve() for value in arguments)
    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=False)
    before = state()
    temporary = fixture.with_name(f"{fixture.stem}-reopen.blend")
    try:
        bpy.ops.wm.save_as_mainfile(filepath=str(temporary), check_existing=False, compress=True)
        bpy.ops.wm.open_mainfile(filepath=str(temporary), load_ui=False)
        after = state()
    finally:
        temporary.unlink(missing_ok=True)
    if before != after:
        raise RuntimeError(f"simulation save/reopen drift: {before} != {after}")
    report = {"schemaVersion": 1, "task": "WBV2-P4-004", "operation": "SIMULATION_CACHE_DESKTOP", "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(), "state": after, "saveReopen": "EXACT", "blenderVersion": bpy.app.version_string}
    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("wbv2-p4-004-desktop-ok body=ACTIVE mass=2.5 collision=PASSIVE frames=1..4 saveReopen=exact")


if __name__ == "__main__":
    main()