// MQTT-адаптер: приём позиций от FLEX-сервера (navtelecom/<imei>/state) +
// состояние каналов Wiren Board (/devices/<dev>/controls/<ch>).
import mqtt from 'mqtt';
import { config } from '../config.js';
import { addPosition, upsertEntity, updateChannel } from '../store.js';
import { imeiOwner } from '../tenants.js';

const TELE_KEYS = ['pwr_ext', 'pwr_int', 'temp1', 'temp2', 'gsm', 'speed', 'sat', 'event_code'];

export function startMqtt() {
  if (!config.mqtt) return false;
  const c = mqtt.connect(config.mqtt.url, {
    username: config.mqtt.username,
    password: config.mqtt.password,
    reconnectPeriod: 5000,
  });
  c.on('connect', () => {
    console.log('[mqtt] подключён', config.mqtt.url);
    c.subscribe('navtelecom/+/state');
    c.subscribe(`${config.mqtt.prefix}/+/controls/+`);
  });
  c.on('message', (topic, buf) => {
    try {
      let m = topic.match(/^navtelecom\/([^/]+)\/state$/);
      if (m) {
        const imei = m[1];
        const p = JSON.parse(buf.toString());
        const lat = p.lat ?? p.latitude;
        const lon = p.lon ?? p.longitude;
        const telemetry = {};
        TELE_KEYS.forEach((k) => p[k] != null && (telemetry[k] = Number(p[k])));
        const id = `nt-${imei}`;
        const clientId = imeiOwner(imei) || 'unassigned';
        upsertEntity({ id, clientId, name: `Трекер ${imei}`, type: 'transport' }); // тег арендатора по IMEI
        if (lat != null && lon != null) addPosition(id, Number(lat), Number(lon), telemetry);
        else upsertEntity({ id, online: true, telemetry });
        return;
      }
      m = topic.match(new RegExp(`${config.mqtt.prefix}/([^/]+)/controls/([^/]+)$`));
      if (m) {
        const v = buf.toString();
        updateChannel(`${m[1]}/${m[2]}`, { on: v === '1' || v === 'true', ...(isNaN(+v) ? {} : { level: +v }) });
      }
    } catch {
      /* malformed payload — ignore */
    }
  });
  c.on('error', (e) => console.error('[mqtt]', e.message));
  return true;
}