'use strict';
const { getClient, getPrefix, publish } = require('./client');
const { getConfig, patchConfig, on: onConfigChange } = require('../config');
const poller = require('../poller');

function subscribe() {
  const client = getClient();
  if (!client) return;
  const prefix = getPrefix();

  const setTopic = `${prefix}/$config/set`;
  client.subscribe(setTopic);

  client.on('message', (topic, buf) => {
    if (topic !== setTopic) return;
    let patch;
    try {
      patch = JSON.parse(buf.toString());
    } catch {
      console.warn('[config-bridge] Invalid JSON on $config/set');
      return;
    }
    patchConfig(patch);
    console.log('[config-bridge] Config updated:', JSON.stringify(patch));
  });

  // Republish current config on connect
  publishConfig();

  // Republish + reload poller when config changes
  onConfigChange('change', () => {
    publishConfig();
    poller.reload();
  });
}

function publishConfig() {
  publish('$config', getConfig());
}

module.exports = { subscribe, publishConfig };