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

VERSION_FILE = Path("versions/iperf3.version")
LATEST_RELEASE_URL = "https://api.github.com/repos/esnet/iperf/releases/latest"


def fetch_latest_version() -> str:
    req = urllib.request.Request(
        LATEST_RELEASE_URL,
        headers={
            "Accept": "application/vnd.github+json",
            "User-Agent": "static-musl-builds-updater",
        },
    )
    with urllib.request.urlopen(req, timeout=30) as resp:
        data = json.load(resp)
    tag = data["tag_name"].strip()
    version = re.sub(r"^v", "", tag)
    if not re.fullmatch(r"[0-9]+(?:\.[0-9]+)*", version):
        raise ValueError(f"Unexpected iperf3 version format: {version!r}")
    return version


def main() -> int:
    parser = argparse.ArgumentParser()
    parser.add_argument("--update-file", action="store_true", help="Write latest version into versions/iperf3.version if changed")
    args = parser.parse_args()

    latest = fetch_latest_version()
    current = VERSION_FILE.read_text(encoding="utf-8").strip() if 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:
        VERSION_FILE.parent.mkdir(parents=True, exist_ok=True)
        VERSION_FILE.write_text(latest + "\n", encoding="utf-8")
        print(f"updated_file={VERSION_FILE}")
    return 0


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