#!/usr/bin/env python3
from __future__ import annotations

import json
from urllib.request import urlopen


VERSION_MANIFEST_URL = "https://launchermeta.mojang.com/mc/game/version_manifest_v2.json"


def main() -> int:
    with urlopen(VERSION_MANIFEST_URL, timeout=30) as response:
        manifest = json.load(response)

    latest_release = manifest["latest"]["release"]
    latest_snapshot = manifest["latest"]["snapshot"]

    latest_release_entry = next(version for version in manifest["versions"] if version["id"] == latest_release)
    with urlopen(latest_release_entry["url"], timeout=30) as response:
        version_metadata = json.load(response)

    java_version = version_metadata.get("javaVersion", {}).get("majorVersion")
    if not isinstance(java_version, int):
        raise RuntimeError(f"Latest Minecraft release {latest_release} does not declare a javaVersion.majorVersion")

    print(latest_release)
    print(f"snapshot={latest_snapshot}")
    print(f"java_version={java_version}")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())