"""Repository-local helpers; ROOT is derived from this file, not a conversion workspace."""
import datetime
import hashlib
import json
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
REVISION = '1ea54127d3bd52f6d753d9257b32a6380b873907'
PACKAGE_REVISION = 'c4daaac28af9fea95d627015cffa2dd5a5926ee6'
LADDER = [1024, 512, 256, 128, 64, 32, 16, 8, 4, 2, 1]


def write_json(path, obj):
    path = ROOT / path
    path.parent.mkdir(parents=True, exist_ok=True)
    temp = path.with_suffix(path.suffix + '.tmp')
    temp.write_text(json.dumps(obj, indent=2, ensure_ascii=False, allow_nan=False) + '\n')
    temp.replace(path)


def read_json(path):
    return json.loads((ROOT / path).read_text())


def sha256(path):
    with open(path, 'rb') as stream:
        return hashlib.file_digest(stream, 'sha256').hexdigest()


def file_fact(path):
    path = Path(path)
    return dict(path=str(path.relative_to(ROOT)), bytes=path.stat().st_size, sha256=sha256(path))