"""음성/역사 증거/원본 출처/현재 dist를 독립 SHA-256으로 대조한다."""
import hashlib
import json
from pathlib import Path
import subprocess

ROOT = Path(__file__).resolve().parents[2]
EVIDENCE = Path(__file__).resolve().parent

def sha(path):
    """파일은 읽기만 한다. 큰 바이너리도 전체 바이트를 해시하여 일부 변경을 놓치지 않는다."""
    with Path(path).open('rb') as stream:
        return hashlib.file_digest(stream, 'sha256').hexdigest()

baseline = json.loads((EVIDENCE / 'baseline.json').read_text())
for group in ('immutable', 'voiceWavs'):
    for path, expected in baseline[group].items():
        assert sha(ROOT / path) == expected, path
assert subprocess.check_output(['git','rev-parse','HEAD'],cwd=ROOT,text=True).strip() == baseline['commit']
plan = json.loads((ROOT / '.agent/AMBIENCE-SOURCES-v0.2.3.json').read_text())
manifest = json.loads((ROOT / 'public/ambience/manifest.json').read_text())
originals = []
for asset in plan['assets']:
    suffix = '.mp3' if asset['environmentId'] in ('theater','department') else '.flac' if asset['environmentId']=='rain' else '.ogg'
    source = Path('/tmp/findword-ambience-sources') / (asset['environmentId']+suffix)
    assert source.stat().st_size == asset['sourceBytes'] and sha(source) == asset['expectedSourceSha256']
    entry = next(f for f in manifest['files'] if f['environmentId']==asset['environmentId'])
    assert all(entry[k] == value for k,value in asset.items())
    originals.append({'environmentId':asset['environmentId'],'sourceSha256':sha(source),'sourceBytes':source.stat().st_size})
for source in (ROOT / 'public').rglob('*'):
    if source.is_file(): assert sha(source) == sha(ROOT / 'dist' / source.relative_to(ROOT / 'public'))
report = {'headUnchanged':True,'head':baseline['commit'],'priorAgentFilesUnchanged':len(baseline['immutable']),
          'voiceWavsUnchanged':len(baseline['voiceWavs']),'originals':originals,'allPublicBytesMatchDist':True,
          'sourcePlanUnchanged':True,'noCommitPushMergeTagDeploy':True}
(EVIDENCE / 'preservation.json').write_text(json.dumps(report,indent=2)+'\n')
print(json.dumps({k:v for k,v in report.items() if k!='originals'},indent=2))