package com.basic.security.utils;

import java.net.InetAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.UnknownHostException;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;

public class DeviceNetData {
    /**
     * 获取IP地址
     */
    public static String getMaskAndGateWay() {
        try {
            Enumeration<NetworkInterface> eni = NetworkInterface.getNetworkInterfaces();
            while (eni.hasMoreElements()) {
                NetworkInterface networkCard = eni.nextElement();
                if (!networkCard.isUp()) { // 判断网卡是否在使用
                    continue;
                }
                String DisplayName = networkCard.getDisplayName();
                List<InterfaceAddress> addressList = networkCard.getInterfaceAddresses();
                Iterator<InterfaceAddress> addressIterator = addressList.iterator();
                while (addressIterator.hasNext()) {
                    InterfaceAddress interfaceAddress = addressIterator.next();
                    InetAddress address = interfaceAddress.getAddress();
                    if (!address.isLoopbackAddress()) {
                        String hostAddress = address.getHostAddress();
                        if (hostAddress.indexOf(":") > 0) {
                        } else {
                            String maskAddress = calcMaskByPrefixLength(interfaceAddress.getNetworkPrefixLength());
                            String gateway = calcSubnetAddress(hostAddress, maskAddress);
                            String broadcastAddress = null;
                            InetAddress broadcast = interfaceAddress.getBroadcast();
                            if (broadcast != null)
                                broadcastAddress = broadcast.getHostAddress();
//                            Log.e("GGG", "DisplayName    =   " + DisplayName);
//                            Log.e("GGG", "address        =   " + hostAddress);
//                            Log.e("GGG", "mask           =   " + maskAddress);
//                            Log.e("GGG", "gateway        =   " + gateway);
//                            Log.e("GGG", "broadcast      =   " + broadcastAddress + "\n");
//                            Log.e("GGG", "----- NetworkInterface  Separator ----\n\n");
                            return maskAddress + "-" + gateway;
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

    /**
     * 子掩码
     *
     * @param length
     * @return
     */
    public static String calcMaskByPrefixLength(int length) {
        int mask = 0xffffffff << (32 - length);
        int partsNum = 4;
        int bitsOfPart = 8;
        int maskParts[] = new int[partsNum];
        int selector = 0x000000ff;
        for (int i = 0; i < maskParts.length; i++) {
            int pos = maskParts.length - 1 - i;
            maskParts[pos] = (mask >> (i * bitsOfPart)) & selector;
        }
        String result = "";
        result = result + maskParts[0];
        for (int i = 1; i < maskParts.length; i++) {
            result = result + "." + maskParts[i];
        }
        return result;
    }

    /**
     * 网关
     *
     * @param ip
     * @param mask
     * @return
     */
    public static String calcSubnetAddress(String ip, String mask) {
        String result = "";
        try {
            // calc sub-net IP
            InetAddress ipAddress = InetAddress.getByName(ip);
            InetAddress maskAddress = InetAddress.getByName(mask);
            byte[] ipRaw = ipAddress.getAddress();
            byte[] maskRaw = maskAddress.getAddress();
            int unsignedByteFilter = 0x000000ff;
            int[] resultRaw = new int[ipRaw.length];
            for (int i = 0; i < resultRaw.length; i++) {
                resultRaw[i] = (ipRaw[i] & maskRaw[i] & unsignedByteFilter);
            }
            // make result string
            result = result + resultRaw[0];
            for (int i = 1; i < resultRaw.length; i++) {
                result = result + "." + resultRaw[i];
            }
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
        return result;
    }
}