"""Preserve a whole native trial directory and run its independent oracle."""
from pathlib import Path
import hashlib
import json
import shutil
import subprocess
import sys
from datetime import datetime, timezone

root = Path(__file__).resolve().parent.parent
trial = root / '.local/native-qa/canvas-20260911'
name, source_name, mode = sys.argv[1:4]
assert name.replace('-', '').isalnum()
source = (trial / source_name).resolve()
assert source.is_relative_to(trial) and source.is_dir()
dest = trial / 'checkpoints' / name
assert not dest.exists(), 'Never overwrite a verified snapshot'
shutil.copytree(source, dest)
files = []
for p in sorted(source.rglob('*')):
    if p.is_file():
        rel = p.relative_to(source)
        raw = p.read_bytes()
        assert (dest / rel).read_bytes() == raw
        files.append({'path': rel.as_posix(), 'bytes': len(raw), 'sha256': hashlib.sha256(raw).hexdigest()})
checker = root / '.local/native-qa/scenario-authoring-contract.exe'
commands = [[str(checker), 'check', mode, str(dest / 'project.arcadia')]]
if len(sys.argv) > 4:
    reference = (root / sys.argv[4]).resolve()
    assert reference.is_relative_to(root) and reference.is_file()
    commands.append([str(checker), 'same', str(reference), str(dest / 'project.arcadia')])
results = []
for command in commands:
    run = subprocess.run(command, capture_output=True)
    results.append({'argv': command, 'exit_code': run.returncode, 'stdout': run.stdout.decode('utf-8', errors='replace'), 'stderr': run.stderr.decode('utf-8', errors='replace')})
record = {'utc': datetime.now(timezone.utc).isoformat(), 'name': name, 'source': str(source), 'snapshot': str(dest), 'files': files, 'checker_sha256': hashlib.sha256(checker.read_bytes()).hexdigest(), 'results': results}
(trial / 'evidence' / (name + '-check.json')).write_text(json.dumps(record, indent=2) + '\n', encoding='utf-8')
print(json.dumps(record, indent=2))
sys.exit(0 if all(x['exit_code'] == 0 for x in results) else 1)