"""Initialize a compact ledger. Not invoked by read-only verification.

All historic fields are retained by raw-SHA references. This initializer
replaces selection work; never use it to refresh pins after a source change.
"""
import hashlib
import json
from pathlib import Path

ROOT = Path(__file__).resolve().parents[5]
HERE = Path(__file__).resolve().parent
INPUT = 'docs/spec/inputs/P22-02-accepted-usage.json'
CURRENT = 'docs/plans/original-completion-2026-10-02/checkpoints/p22-02-slot-contract-r02/all-slot-current-candidate-contracts.json'
EVIDENCE = 'docs/plans/original-completion-2026-10-02/checkpoints/p22-02-current-contract-r01'


def build():
    paths = [INPUT, CURRENT] + [str(p.relative_to(ROOT)) for p in sorted((ROOT / EVIDENCE).iterdir()) if p.is_file()]
    pins = {p: hashlib.sha256((ROOT / p).read_bytes()).hexdigest() for p in paths}
    current = json.loads((ROOT / CURRENT).read_text())
    ledger = {
        'schema': 'p22-reference-contract-v2',
        'references': pins,
        'reconstruction': 'All accepted codec fields and snapshot fields retained by raw SHA; selections inherit entire snapshot contracts by identity, including every unmade condition.',
        'selections': {c['id']: ('candidate' if c['candidate_refs'] else 'missing') for c in current['contracts']},
        'source_pins': {p: f['current_raw_sha256'] for p, f in current['candidate_pool'].items()},
        'unit_proofs': {},
    }
    (HERE / 'asset-contracts.json').write_text(json.dumps(ledger, ensure_ascii=False, indent=2) + '\n')


if __name__ == '__main__':
    build()