// UATU

const CronJob = require('cron').CronJob;
const pm2 = require('pm2');

const logger = require('log4js').getLogger('WATCHER');
const nodeFree = require('node-free');

// load env variables from file
require('dotenv').config();

logger.level = 'trace';

function formatBytes(bytes, decimals = 2) {
  if (bytes === 0) return '0 Bytes';

  const k = 1024;
  const dm = decimals < 0 ? 0 : decimals;
  const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];

  const i = Math.floor(Math.log(bytes) / Math.log(k));

  return `${parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) } ${ sizes[i]}`;
}

async function logMemory() {
  pm2.list((err, processDescriptionList) => {
    if (err)
      logger.error(err);
    else 
      for (const item of processDescriptionList) {
        // logger.debug(JSON.stringify(item));
        const { pid, name, monit } = item;
        const { memory, cpu } = monit;
        if (name !== 'watcher') 
          logger.info(`${name} :: PID:${pid} :: MEMORY:${formatBytes(memory)} :: CPU:${cpu}`);
      }
  });

  logger.info(`Total:${formatBytes(nodeFree.total())} :: Used:${formatBytes(nodeFree.used())} :: Free:${formatBytes(nodeFree.free())}`);
}

async function run() {
  pm2.connect(() => {
    logMemory();
  });

  new CronJob('*/5 * * * *', async () => {
    await logMemory();
  }, null, true);

  logger.info('Watcher Launched');
}

process.once('uncaughtException', function caught(err) {
  logger.error('Uncaught', err);
});

run();