"""Copy original grenade assets; verify and append provenance manifest."""
from pathlib import Path
import shutil,hashlib,json,struct,wave
root=Path(__file__).resolve().parents[1]
source=Path.home()/'.steam/steam/steamapps/common/Half-Life/valve'
manifest=root/'assets/half_life_manifest.json'
rows=json.loads(manifest.read_text())
for relative in ['models/grenade.mdl']+['sound/weapons/explode%d.wav'%i for i in [3,4,5]]:
 p=source/relative
 dest=root/'assets'/('weapons/'+p.name if relative.startswith('models/') else 'audio/weapons/'+p.name)
 shutil.copyfile(p,dest)
 raw=p.read_bytes(); assert raw==dest.read_bytes()
 row={'source':relative,'destination':str(dest.relative_to(root)),'sha256':hashlib.sha256(raw).hexdigest()}
 if p.suffix=='.mdl':
  assert raw[:4]==b'IDST' and struct.unpack_from('<i',raw,4)[0]==10
  row['textures']=struct.unpack_from('<i',raw,180)[0]
 else:
  with wave.open(str(dest)) as w: assert w.getcomptype()=='NONE'
 rows=[x for x in rows if x['destination']!=row['destination']]+[row]
 print(relative,row['sha256'])
manifest.write_text(json.dumps(rows,indent=2)+'\n')