#!/usr/bin/python3
# -*- coding: utf-8 -*-

import json
import os
import sys

DEBIAN_VERSION_MAP = {8: "jessie", 9: "stretch", 10: "buster", 11: "bullseye"}


def debian_distribution():
    with open("/etc/debian_version") as f:
        debian_version_string = f.read().strip("\n")
    if debian_version_string.endswith("/sid"):
        return debian_version_string.strip("/sid")
    try:
        major, minor = debian_version_string.split(".")
        release_number = int(major)
        return DEBIAN_VERSION_MAP[release_number]
    except ValueError:
        return None


def debian_distribution_docker_safe():
    debian_version = debian_distribution()
    if debian_version == "bullseye":
        json.dump({"version": "bullseye", "safe_version": "buster"}, sys.stdout)
    elif debian_version is not None:
        json.dump(
            {"version": debian_version, "safe_version": debian_version}, sys.stdout
        )
    else:
        json.dump("", sys.stdout)


if __name__ == "__main__":
    debian_distribution_docker_safe()