// Settings from the environment. Only the database path is needed to run. Without the APNs
// settings the gateway still serves the watch, it just logs pushes instead of sending them.

import { readFileSync } from "node:fs";

import type { ApnsConfig } from "./apns.ts";

export interface Config {
  port: number;
  dbPath: string;
  apns: ApnsConfig | null;
}

export function loadConfig(env = process.env): Config {
  const keyId = env.APNS_KEY_ID;
  const teamId = env.APNS_TEAM_ID;
  const key = env.APNS_KEY ?? (env.APNS_KEY_PATH ? readFileSync(env.APNS_KEY_PATH, "utf8") : undefined);
  return {
    port: Number(env.PORT ?? 8080),
    dbPath: env.WRISTCODE_DB ?? "data/wristcode.sqlite",
    apns:
      keyId && teamId && key
        ? { keyId, teamId, key: key.replace(/\\n/g, "\n"), topic: env.APNS_TOPIC ?? "org.gbrown.wristcode.watchkitapp" }
        : null,
  };
}