/*!
 * Copyright (c) 2015-present, Okta, Inc. and/or its affiliates. All rights reserved.
 * The Okta software accompanied by this notice is provided pursuant to the Apache License, Version 2.0 (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.
 *
 */
/* eslint-disable complexity, max-statements */

export function urlParamsToObject(hashOrSearch: string) {
  // Predefine regexs for parsing hash
  var plus2space = /\+/g;
  var paramSplit = /([^&=]+)=?([^&]*)/g;
  var fragment = hashOrSearch || '';

  // Some hash based routers will automatically add a / character after the hash
  if (fragment.charAt(0) === '#' && fragment.charAt(1) === '/') {
    fragment = fragment.substring(2);
  }

  // Remove the leading # or ?
  if (fragment.charAt(0) === '#' || fragment.charAt(0) === '?') {
    fragment = fragment.substring(1);
  }


  var obj = {};

  // Loop until we have no more params
  var param;
  while (true) { // eslint-disable-line no-constant-condition
    param = paramSplit.exec(fragment);
    if (!param) { break; }

    var key = param[1];
    var value = param[2];

    // id_token should remain base64url encoded
    if (key === 'id_token' || key === 'access_token' || key === 'code') {
      obj[key] = value;
    } else {
      obj[key] = decodeURIComponent(value.replace(plus2space, ' '));
    }
  }
  return obj;
}