"""Источник: synthetic-group/gen/xlsx.py (#35). Детерминированное сохранение xlsx: фиксированные метки книги и записей zip."""

import datetime
import io
import re
import zipfile
from pathlib import Path

import openpyxl

FIXED_TIME = datetime.datetime(2026, 1, 1, 0, 0, 0)
ZIP_DATE_TIME = (2026, 1, 1, 0, 0, 0)
CREATOR = "arm-ka synthetic"
_FIXED_W3CDTF = FIXED_TIME.strftime("%Y-%m-%dT%H:%M:%SZ").encode()
_CORE_PART = "docProps/core.xml"
_MODIFIED_RE = re.compile(rb"(<dcterms:modified[^>]*>)[^<]*(</dcterms:modified>)")


def save_deterministic(wb: openpyxl.Workbook, path: Path) -> None:
    wb.properties.creator = CREATOR
    wb.properties.lastModifiedBy = CREATOR
    wb.properties.created = FIXED_TIME
    wb.properties.modified = FIXED_TIME
    raw = io.BytesIO()
    wb.save(raw)
    out = io.BytesIO()
    with zipfile.ZipFile(raw) as source, zipfile.ZipFile(out, "w", zipfile.ZIP_DEFLATED) as target:
        for info in source.infolist():
            clone = zipfile.ZipInfo(info.filename, date_time=ZIP_DATE_TIME)
            clone.compress_type = zipfile.ZIP_DEFLATED
            clone.external_attr = info.external_attr
            content = source.read(info.filename)
            if info.filename == _CORE_PART:
                content = _MODIFIED_RE.sub(rb"\g<1>" + _FIXED_W3CDTF + rb"\g<2>", content)
            target.writestr(clone, content)
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_bytes(out.getvalue())