import { isDid, type AtprotoDid } from "@atcute/lexicons/syntax";
import { env } from "process";

interface Config {
  repoDid: AtprotoDid;
  appPass: string;
  hostName?: string;
  hostDescription?: string;
}

const required = (value: unknown) => typeof value !== "undefined";

const getConfig = (prefix: string): Config => {
  const get = <Value>(
    name: string,
    check: (value: unknown) => boolean = () => true,
  ): Value => {
    const value = env[`${prefix}${name}`];
    if (check(value)) return value as Value;
    throw `config key ${name} is invalid`;
  };
  return {
    repoDid: get("REPO_DID", isDid),
    appPass: get("APP_PASSWORD", required),
    hostName: get("HOST_NAME"),
    hostDescription: get("HOST_DESCRIPTION"),
  };
};

export const config = getConfig("BAROMETER_");