/**
 * Checks related to Node runtime version
 */

/*
 * 2018 - muxator
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

const semver = require('semver');

/**
 * Quits if Etherpad is not running on a given minimum Node version
 *
 * @param  {String}     minNodeVersion   Minimum required Node version
 * @param  {Function}   callback         Standard callback function
 */
exports.enforceMinNodeVersion = function(minNodeVersion, callback) {
  const currentNodeVersion = process.version;

  // we cannot use template literals, since we still do not know if we are
  // running under Node >= 4.0
  if (semver.lt(currentNodeVersion, minNodeVersion)) {
    console.error('Running Etherpad on Node ' + currentNodeVersion + ' is not supported. Please upgrade at least to Node ' + minNodeVersion);
  } else {
    console.debug('Running on Node ' + currentNodeVersion + ' (minimum required Node version: ' + minNodeVersion + ')');
    callback();
  }
};

/**
 * Prints a warning if running on a supported but deprecated Node version
 *
 * @param  {String}    lowestNonDeprecatedNodeVersion   all Node version less than this one are deprecated
 * @param  {Function}  epRemovalVersion                 Etherpad version that will remove support for deprecated Node releases
 */
exports.checkDeprecationStatus = function(lowestNonDeprecatedNodeVersion, epRemovalVersion, callback) {
  const currentNodeVersion = process.version;

  if (semver.lt(currentNodeVersion, lowestNonDeprecatedNodeVersion)) {
    console.warn(`Support for Node ${currentNodeVersion} will be removed in Etherpad ${epRemovalVersion}. Please consider updating at least to Node ${lowestNonDeprecatedNodeVersion}`);
  }

  callback();
};