/**
 * Copyright 2017 Google Inc.
 *
 * 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.
 */

import { CONSTANTS } from './constants';

/**
 * Throws an error if the provided assertion is falsy
 * @param {*} assertion The assertion to be tested for falsiness
 * @param {!string} message The message to display if the check fails
 */
export const assert = function(assertion, message) {
  if (!assertion) {
    throw assertionError(message);
  }
};

/**
 * Returns an Error object suitable for throwing.
 * @param {string} message
 * @return {!Error}
 */
export const assertionError = function(message) {
  return new Error(
    'Firebase Database (' +
      CONSTANTS.SDK_VERSION +
      ') INTERNAL ASSERT FAILED: ' +
      message
  );
};