#!/usr/bin/env python3
"""Regenerate the publication checksum manifest after a validated projection."""

from __future__ import annotations

import hashlib
from pathlib import Path


ROOT = Path(__file__).resolve().parents[1]
OUTPUT = ROOT / "SHA256SUMS.txt"


def sha256(path: Path) -> str:
    digest = hashlib.sha256()
    with path.open("rb") as handle:
        for block in iter(lambda: handle.read(8 << 20), b""):
            digest.update(block)
    return digest.hexdigest()


def main() -> None:
    paths = sorted(
        path
        for path in ROOT.rglob("*")
        if path.is_file()
        and path != OUTPUT
        and ".cache" not in path.relative_to(ROOT).parts
        and "__pycache__" not in path.relative_to(ROOT).parts
        and path.suffix != ".pyc"
        and not path.name.endswith(".slim.tmp")
    )
    lines = [f"{sha256(path)}  {path.relative_to(ROOT).as_posix()}" for path in paths]
    tmp = OUTPUT.with_suffix(".txt.tmp")
    tmp.write_text("\n".join(lines) + "\n")
    tmp.replace(OUTPUT)
    print(f"checksum_entries={len(paths)}")


if __name__ == "__main__":
    main()