/*******************************************************************************
 * Copyright 2016-2017 ZTE, Inc. and others.
 * 
 * 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.
 ******************************************************************************/
package org.onap.msb.apiroute.wrapper.util;

import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.StringUtils;


public class MicroServiceUtil {
    public static final String PREFIX_PATH = "discover:microservices";

    private static final Pattern SERVICE_KEY_REGEX_PATTERN =
                    Pattern.compile("discover:microservices:(?<servicename>[^:]+)(:(?<version>[^:]*))");


    public static String getPrefixedKey(String... paths) {
        StringBuffer sb = new StringBuffer();

        sb.append(PREFIX_PATH);

        for (int i = 0; i < paths.length; i++) {
            sb.append(":");
            sb.append(paths[i]);
        }
        return sb.toString();
    }


    public static String getServiceKey(String serviceName, String version) {
        return getPrefixedKey(serviceName, version);
    }

    public static Pattern getServiceKeyRegexPattern() {
        return SERVICE_KEY_REGEX_PATTERN;
    }



    public static String getRealIp(HttpServletRequest request) {
        String ip = request.getHeader("X-Forwarded-For");
        if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) {
            // After the reverse proxy can have multiple IP value for many times, the first IP is
            // the real IP
            int index = ip.indexOf(",");
            if (index != -1) {
                return ip.substring(0, index);
            } else {
                return ip;
            }
        }
        ip = request.getHeader("X-Real-IP");

        if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) {
            return ip;
        }


        return request.getRemoteAddr();

    }


}