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/*
 * (C) 2007-2012 Alibaba Group Holding Limited.
 * 
 * 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.
 * Authors:
 *   wuhua  , boyan 
 */
package com.taobao.metamorphosis.network;

import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.taobao.gecko.core.command.ResponseCommand;
import com.taobao.gecko.service.Connection;
import com.taobao.gecko.service.exception.NotifyRemotingException;


public class RemotingUtils {
    static final Log log = LogFactory.getLog(RemotingUtils.class);


    public static void response(final Connection conn, final ResponseCommand response) {
        if (response == null || conn == null) {
            return;
        }
        try {
            conn.response(response);
        }
        catch (final NotifyRemotingException e) {
            log.error("??????Ӧʧ??", e);
        }
    }


    public static String getLocalAddress() throws Exception {
        // ??????????????һ???ǻ?·ip??ַ??????
        final Enumeration enumeration = NetworkInterface.getNetworkInterfaces();
        InetAddress ipv6Address = null;
        while (enumeration.hasMoreElements()) {
            final NetworkInterface networkInterface = enumeration.nextElement();
            final Enumeration en = networkInterface.getInetAddresses();
            while (en.hasMoreElements()) {
                final InetAddress address = en.nextElement();
                if (!address.isLoopbackAddress()) {
                    if (address instanceof Inet6Address) {
                        ipv6Address = address;
                    }
                    else {
                        // ????ʹ??ipv4
                        return normalizeHostAddress(address);
                    }
                }

            }

        }
        // û??ipv4????ʹ??ipv6
        if (ipv6Address != null) {
            return normalizeHostAddress(ipv6Address);
        }
        final InetAddress localHost = InetAddress.getLocalHost();
        return normalizeHostAddress(localHost);
    }


    public static String normalizeHostAddress(final InetAddress localHost) {
        if (localHost instanceof Inet6Address) {
            return "[" + localHost.getHostAddress() + "]";
        }
        else {
            return localHost.getHostAddress();
        }
    }

}