/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.sdc.fe.servlets;

import org.eclipse.jetty.proxy.ProxyServlet;
import org.openecomp.sdc.common.api.Constants;
import org.openecomp.sdc.fe.config.Configuration;
import org.openecomp.sdc.fe.config.ConfigurationManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;

public class KibanaServlet extends ProxyServlet {
	private static final long serialVersionUID = 1L;
	private static Logger log = LoggerFactory.getLogger(KibanaServlet.class.getName());

	@Override
	public String rewriteTarget(HttpServletRequest request) {

		String originalUrl = request.getRequestURI();

		String redirectedUrl = getModifiedUrl(request);

		log.debug("KibanaServlet Redirecting request from: {} , to: {}", originalUrl, redirectedUrl);

		return redirectedUrl;
	}

	public String getModifiedUrl(HttpServletRequest request) {
		Configuration config = getConfiguration(request);
		if (config == null) {
			log.error("failed to retrive configuration.");
		}
		// String scheme = request.getScheme();
		String contextPath = request.getContextPath(); // /mywebapp
		String servletPath = request.getServletPath(); // /servlet/MyServlet
		String pathInfo = request.getPathInfo(); // /a/b;c=123
		String queryString = request.getQueryString(); // d=789

		StringBuilder url = new StringBuilder();
		url.append(config.getKibanaProtocol()).append("://").append(config.getKibanaHost());
		url.append(":").append(config.getKibanaPort());
		url.append(contextPath).append(servletPath);

		if (pathInfo != null) {
			url.append(pathInfo);
		}
		if (queryString != null) {
			url.append("?").append(queryString);
		}

		String redirectedUrl = url.toString().replace("/sdc1/kibanaProxy/", "/");
		return redirectedUrl;

	}

	private Configuration getConfiguration(HttpServletRequest request) {
		Configuration config = ((ConfigurationManager) request.getSession().getServletContext()
				.getAttribute(Constants.CONFIGURATION_MANAGER_ATTR)).getConfiguration();
		return config;
	}
}