const DEFAULT_MAX_LAST_DATA_AGE_MS = 2 * 60 * 1000;
  const DEFAULT_INTERVAL_BETWEEN_IDLE_CHECK_MS = 30 * 1000;

  const config = require('komodo-sdk/config');

  const logger = require('komodo-sdk/logger');

  
  const modemInfo = {
      device: config.modem.device,
      manufacturer: null,
      model: null,
      imei: null,
      imsi: null,

      cops: null,
      networkId: null,
      networkName: null,
      signalStrength: null,
      signalStrengthTs: null,
      signalStrengthTsReadable: null,

      startTime: new Date(),
      lastWriteTs: null,
      lastReadTs: null,

  };

  if (!config.disable_idle_check) {

      const intervalBeetwenCheckMs = config.interval_beetwen_signal_strength_ms
          || DEFAULT_INTERVAL_BETWEEN_IDLE_CHECK_MS;
  
      logger.info('Registering idle / stuck modem background check', { intervalBeetwenCheckMs });

      setInterval(() => {

          const deltaMs = new Date() - Math.max(
              modemInfo.startTime,
              Math.min(modemInfo.lastWriteTs, modemInfo.lastReadTs),
          );

          const maxLastDataAgeMs = config.max_last_data_age_ms || DEFAULT_MAX_LAST_DATA_AGE_MS;
          if (deltaMs >= maxLastDataAgeMs) {
              logger.warn(`Modem idle for more than ${maxLastDataAgeMs} ms. Stucked modem? Terminating!`, { deltaMs });

              process.exit(1);
          }

      }, intervalBeetwenCheckMs);

  } else {
      logger.info('Skip idle / stuck modem background check by config.disable_idle_check');

  }

  module.exports = modemInfo;