#!/usr/bin/env python3
import hashlib,json,pathlib,sys,tempfile,bpy
def state():
    if len(bpy.data.libraries)!=1: raise RuntimeError("catalog-undo-push library missing")
    lib=bpy.data.libraries[0]; return {"name":lib.name,"filepath":lib.filepath,"packed":lib.packed_file is not None}
def main():
    args=sys.argv[sys.argv.index("--")+1:]
    if len(args)!=2: raise SystemExit("usage")
    fixture,output=(pathlib.Path(v).resolve() for v in args); bpy.ops.wm.open_mainfile(filepath=str(fixture),load_ui=False); before=state(); accepted=("context is incorrect","No asset selected","No asset library","Catalog")
    try: poll=bool(bpy.ops.asset.catalog_undo_push.poll())
    except RuntimeError as e:
        if not any(x in str(e) for x in accepted): raise
        poll=False
    if poll: raise RuntimeError("catalog_undo_push poll unexpectedly true")
    try: bpy.ops.asset.catalog_undo_push()
    except RuntimeError as e:
        if not any(x in str(e) for x in accepted): raise
        status="CANCELLED"
    else: raise RuntimeError("catalog_undo_push unexpectedly finished")
    if state()!=before: raise RuntimeError("catalog_undo_push mutated Main")
    with tempfile.NamedTemporaryFile(prefix="m16-catalog-undo-push-reopen-",suffix=".blend",dir=fixture.parent) as t:
        bpy.ops.wm.save_as_mainfile(filepath=t.name,check_existing=False,compress=True); bpy.ops.wm.open_mainfile(filepath=t.name,load_ui=False); after=state()
    if after!=before: raise RuntimeError("catalog_undo_push save/reopen drift")
    report={"schemaVersion":1,"task":"M16-GAP-00273","operation":"ASSET_CATALOG_UNDO_PUSH_DESKTOP","fixture":str(fixture),"fixtureSha256":hashlib.sha256(fixture.read_bytes()).hexdigest(),"before":before,"after":after,"poll":poll,"operatorStatus":status,"mainMutation":"NONE","saveReopen":"EXACT","blenderVersion":bpy.app.version_string}; output.parent.mkdir(parents=True,exist_ok=True); output.write_text(json.dumps(report,indent=2,sort_keys=True)+"\n"); print("asset-catalog-undo-push-desktop-ok poll=false status=CANCELLED mainMutation=none saveReopen=exact")
if __name__=="__main__":
    try: main()
    except Exception as e: print(f"asset-catalog-undo-push-desktop-failed: {e}"); raise SystemExit(1)