/**
 * Copyright 2015 CANAL+ Group
 *
 * 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.
 */

/**
 * Creates an ID generator which generates a number containing an incremented
 * number each time you call it.
 * @returns {Function}
 */
export default function idGenerator(): () => string {
  let prefix = "";
  let currId = -1;
  return function generateNewId(): string {
    currId++;
    if (currId >= Number.MAX_SAFE_INTEGER) {
      prefix += "0";
      currId = 0;
    }
    return prefix + String(currId);
  };
}