#!/usr/bin/env python3
import argparse
import re
import sys
import urllib.request
from pathlib import Path

DOWNLOADS_URL = "https://busybox.net/downloads/"
VERSION_RE = re.compile(r"busybox-([0-9]+(?:\.[0-9]+)+)\.tar\.bz2")


def version_key(version: str):
    return tuple(int(part) for part in version.split("."))


def fetch_latest_version() -> str:
    req = urllib.request.Request(
        DOWNLOADS_URL,
        headers={"User-Agent": "static-musl-builds-updater"},
    )
    with urllib.request.urlopen(req, timeout=30) as resp:
        html = resp.read().decode("utf-8", "replace")
    versions = sorted(set(VERSION_RE.findall(html)), key=version_key)
    if not versions:
        raise RuntimeError("No BusyBox versions found on downloads page")
    return versions[-1]


def main() -> int:
    parser = argparse.ArgumentParser()
    parser.add_argument("--version-file", required=True, type=Path)
    parser.add_argument("--update-file", action="store_true")
    args = parser.parse_args()

    latest = fetch_latest_version()
    current = args.version_file.read_text(encoding="utf-8").strip() if args.version_file.exists() else ""

    print(f"current={current or '<missing>'}")
    print(f"latest={latest}")

    if current == latest:
        print("status=up-to-date")
        return 0

    print("status=update-available")
    if args.update_file:
        args.version_file.parent.mkdir(parents=True, exist_ok=True)
        args.version_file.write_text(latest + "\n", encoding="utf-8")
        print(f"updated_file={args.version_file}")
    return 0


if __name__ == "__main__":
    sys.exit(main())