/*
 * (c) Copyright Ascensio System SIA 2010-2019
 *
 * This program is a free software product. You can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License (AGPL)
 * version 3 as published by the Free Software Foundation. In accordance with
 * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
 * that Ascensio System SIA expressly excludes the warranty of non-infringement
 * of any third-party rights.
 *
 * This program is distributed WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For
 * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
 *
 * You can contact Ascensio System SIA at 20A-12 Ernesta Birznieka-Upisha
 * street, Riga, Latvia, EU, LV-1050.
 *
 * The  interactive user interfaces in modified source and object code versions
 * of the Program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU AGPL version 3.
 *
 * Pursuant to Section 7(b) of the License you must retain the original Product
 * logo when distributing the program. Pursuant to Section 7(e) we decline to
 * grant you any rights under trademark law for use of our trademarks.
 *
 * All the Product's GUI elements, including illustrations and icon sets, as
 * well as technical writing content are licensed under the terms of the
 * Creative Commons Attribution-ShareAlike 4.0 International. See the License
 * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
 *
 */

'use strict';

const cluster = require('cluster');
const logger = require('./../../Common/sources/logger');
const operationContext = require('./../../Common/sources/operationContext');

if (cluster.isMaster) {
  const fs = require('fs');
  const co = require('co');
  const numCPUs = require('os').cpus().length;
  const configCommon = require('config');
  const config = configCommon.get('FileConverter.converter');
  const license = require('./../../Common/sources/license');
  const tenantManager = require('./../../Common/sources/tenantManager');

  const cfgLicenseFile = configCommon.get('license.license_file');

  const cfgMaxProcessCount = config.get('maxprocesscount');
  var workersCount = 0;
  const readLicense = function* () {
    workersCount = Math.ceil(numCPUs * cfgMaxProcessCount);
    if (!tenantManager.isMultitenantMode()) {
      let [licenseInfo] = yield* license.readLicense(cfgLicenseFile);
      workersCount = Math.min(licenseInfo.count, workersCount);
    }
  };
  const updateWorkers = () => {
    var i;
    const arrKeyWorkers = Object.keys(cluster.workers);
    if (arrKeyWorkers.length < workersCount) {
      for (i = arrKeyWorkers.length; i < workersCount; ++i) {
        const newWorker = cluster.fork();
        operationContext.global.logger.warn('worker %s started.', newWorker.process.pid);
      }
    } else {
      for (i = workersCount; i < arrKeyWorkers.length; ++i) {
        const killWorker = cluster.workers[arrKeyWorkers[i]];
        if (killWorker) {
          killWorker.kill();
        }
      }
    }
  };
  const updateLicense = () => {
    return co(function*() {
      try {
        yield* readLicense();
        operationContext.global.logger.warn('update cluster with %s workers', workersCount);
        updateWorkers();
      } catch (err) {
        operationContext.global.logger.error('updateLicense error: %s', err.stack);
      }
    });
  };

  cluster.on('exit', (worker, code, signal) => {
    operationContext.global.logger.warn('worker %s died (code = %s; signal = %s).', worker.process.pid, code, signal);
    updateWorkers();
  });

  updateLicense();

  if (!tenantManager.isMultitenantMode()) {
    setInterval(updateLicense, 86400000);
  }
} else {
  const converter = require('./converter');
  converter.run();
}

process.on('uncaughtException', (err) => {
  operationContext.global.logger.error((new Date).toUTCString() + ' uncaughtException:', err.message);
  operationContext.global.logger.error(err.stack);
  logger.shutdown(() => {
    process.exit(1);
  });
});