/*
 * This file is part of the Wildfire Chat package.
 * (c) Heavyrain2012 <heavyrain.lee@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

package win.liyufan.im;

import org.slf4j.Logger;

import java.net.*;
import java.util.Enumeration;

public class Utility {
    public static InetAddress getLocalAddress(){
        try {
            Enumeration<NetworkInterface> b = NetworkInterface.getNetworkInterfaces();
            while( b.hasMoreElements()){
                for ( InterfaceAddress f : b.nextElement().getInterfaceAddresses())
                    if ( f.getAddress().isSiteLocalAddress())
                        return f.getAddress();
            }
        } catch (SocketException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void printExecption(Logger LOG, Exception e) {
        String message = "";

        for(StackTraceElement stackTraceElement : e.getStackTrace()) {
            message = message + System.lineSeparator() + stackTraceElement.toString();
        }
        LOG.error("Exception: {}", e.getMessage());
        LOG.error(message);
    }

    public static String getMacAddress() throws UnknownHostException,
        SocketException {
        InetAddress ipAddress = InetAddress.getLocalHost();
        NetworkInterface networkInterface = NetworkInterface
            .getByInetAddress(ipAddress);
        byte[] macAddressBytes = networkInterface.getHardwareAddress();
        StringBuilder macAddressBuilder = new StringBuilder();

        for (int macAddressByteIndex = 0; macAddressByteIndex < macAddressBytes.length; macAddressByteIndex++) {
            String macAddressHexByte = String.format("%02X",
                macAddressBytes[macAddressByteIndex]);
            macAddressBuilder.append(macAddressHexByte);

            if (macAddressByteIndex != macAddressBytes.length - 1)
            {
                macAddressBuilder.append(":");
            }
        }

        return macAddressBuilder.toString();
    }
}