"""Fresh-process second readback of original and archived bytes; no runtime tests."""
from pathlib import Path
import hashlib,json
ROOT=Path(__file__).resolve().parent
manifest=json.loads((ROOT/'original-copy-manifest.json').read_text(encoding='utf-8'))
records=manifest['records']
found={str(p.relative_to(ROOT)) for p in (ROOT/'payload').rglob('*') if p.is_file()}
assert found=={r['archive'] for r in records}
def fingerprint(path):
    with path.open('rb') as stream:
        digest=hashlib.file_digest(stream,'sha256').hexdigest().upper()
    return {'bytes':path.stat().st_size,'sha256':digest}
verified=[]
for r in records:
    original=fingerprint(Path(r['source']))
    archived=fingerprint(ROOT/r['archive'])
    assert original==archived==r['original']==r['copy'],r['archive']
    verified.append({'archive':r['archive'],**archived})
report={'result':'passed','method':'Independent fresh-process traversal, reopen both original and copied files, SHA256 file_digest and stat size, exact inventory comparison','files':len(verified),'bytes':sum(r['bytes'] for r in verified),'original_copy_manifest_sha256':fingerprint(ROOT/'original-copy-manifest.json')['sha256'],'original_manifest_sha256':manifest['original_manifest_sha256'],'verified':verified}
(ROOT/'independent-readback.json').write_text(json.dumps(report,indent=2),encoding='utf-8')
print(json.dumps({k:v for k,v in report.items() if k!='verified'},indent=2))