"""Hash-pinned native recovery receipts, with original completion timestamps."""
import hashlib
import json
from pathlib import Path
from service_assurance import timestamp

ROOT = Path(__file__).resolve().parents[1]


def recovery_signals(now, root=ROOT):
    index = json.loads((root / 'assurance/recovery-evidence.json').read_text())
    if index['schema'] != 'railiance-platform.recovery-evidence.v1':
        raise ValueError('unknown recovery index')
    signals = {}
    for entry in index['receipts']:
        signal = entry['signal']
        if signal in signals or signal not in ('apps-pg.restore', 'forgejo-db.restore'):
            raise ValueError('unexpected recovery signal')
        sample = {'result': 'unavailable', 'observed_at': now.isoformat()}
        try:
            path = (root / entry['path']).resolve()
            if not path.is_relative_to((root / 'docs/evidence').resolve()):
                raise ValueError('receipt outside evidence directory')
            raw = path.read_bytes()
            if hashlib.sha256(raw).hexdigest() != entry['sha256']:
                raise ValueError('receipt drift')
            receipt = json.loads(raw)
            cell = signal.removesuffix('.restore')
            if (receipt['schema'] != 'platform.scaleway-primary-restore.v1'
                    or receipt['primary_destination'] != f's3://railiance-platform-pg-backup/platform-pg/{cell}/'
                    or receipt['source'] != 'Scaleway Barman base backup and WAL'
                    or receipt['stage'] != 'database_acceptance'
                    or receipt['status'] != 'verified'
                    or receipt['cleanup'] is not True
                    or receipt['production_ready'] is not True):
                raise ValueError('receipt not accepted')
            completed = timestamp(receipt['finished_at'])
            if not timestamp(receipt['started_at']) <= completed <= now:
                raise ValueError('invalid receipt chronology')
            sample = {'result': 'pass', 'observed_at': receipt['finished_at']}
        except (OSError, ValueError, KeyError, TypeError):
            pass
        signals[signal] = sample
    return signals