import fs from "fs";
import path from "path";
import { fileURLToPath } from "url";
import config from "../config.js";

const __dirname = path.dirname(fileURLToPath(import.meta.url));

const defaultMqttPath = path.join(__dirname, "..", "config", "mqtt.json");

export function loadMqttConfig() {
  const configured = config.mqtt?.configPath?.trim();
  const configPath = configured || defaultMqttPath;
  if (!fs.existsSync(configPath)) {
    return null;
  }
  const raw = fs.readFileSync(configPath, "utf-8");
  return JSON.parse(raw);
}

export function resolveBrokerPassword(config) {
  const envKey = config?.broker?.passwordEnv;
  if (envKey && process.env[envKey]) {
    return process.env[envKey];
  }
  if (config?.broker?.password) {
    return config.broker.password;
  }
  return process.env.MQTT_PASSWORD || "";
}