/**
 * Copyright 2017-2020 Plexus Interop Deutsche Bank AG
 * SPDX-License-Identifier: Apache-2.0
 *
 * 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.
 */
declare var window: Window;

export class UrlParamsProvider {

    public static getParam(name: string): string | undefined {
        if (typeof window === 'undefined') {
            return undefined;
        }
        const queryString = this.parseUrlParams(window.location.search);
        return queryString[name];
    }

    public static parseUrlParams(query: string): any {
        const queryString: any = {};
        query = query.startsWith('?') ? query.substring(1) : query;
        let vars = query.split('&');
        for (let i = 0; i < vars.length; i++) {
            let pair = vars[i].split('=');
            if (typeof queryString[pair[0]] === 'undefined') {
                queryString[pair[0]] = decodeURIComponent(pair[1]);
            } else if (typeof queryString[pair[0]] === 'string') {
                let arr = [queryString[pair[0]], decodeURIComponent(pair[1])];
                queryString[pair[0]] = arr;
            } else {
                queryString[pair[0]].push(decodeURIComponent(pair[1]));
            }
        }
        return queryString;
    }
}