#!/usr/bin/env python3
import pydantic
from typing import Optional
import socket


class Config(pydantic.BaseModel):
    public_key: str
    host: str
    port: int
    private_key: str


def write_wg(config: Config):
    wg_conf = (
        "[Interface]\n"
        f"privatekey = {config.private_key}\n\n"
        "[Peer]\n"
        f"publickey = {config.public_key}\n"
        f"endpoint = {config.host}:{config.port}\n"
        "persistentkeepalive = 20\n"
        "allowedips = 0.0.0.0/0, ::/0\n"
    )

    try:
        with open("/run/vpnclient/wg.conf", mode="w", encoding="utf-8") as f:
            f.write(wg_conf)
    except IOError:
        pass


def get_config() -> Optional[Config]:
    with open("/snacks/wireguard/wg.json", "r", encoding="utf-8") as f:
        config = Config.parse_raw(f.read())
        config.host = socket.gethostbyname(config.host)
        return config


write_wg(get_config())